Android-er

setBuiltInZoomControls on MapView

2009-11-12T07:37:00.000-08:00

If you read the article Hello, MapView from Android, ZoomControls widget is suggested for zooming in and out of a View. MapView can automatically hook one for us by requesting it with the getZoomControls() method. But...actually it is now deprecated.

Instead of ZoomControls, MapView.setBuiltInZoomControls(true) can be used to add zoom mechanism on MapView.

Modify from previous article, AndroidLocation: with a CheckBox to toggle MapView.setSatellite().

Modify main.xml to remove SeekBar from the previous layout, and change android:clickable of com.google.android.maps.MapView to "true".

main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:orientation="vertical"
 android:layout_width="fill_parent"
 android:layout_height="fill_parent"
 > 
 <LinearLayout
  android:orientation="horizontal"
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  >
  <LinearLayout
  android:orientation="vertical"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  >
   <CheckBox
    android:id="@+id/satellite"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text=" Satellite "
   />
  </LinearLayout>
  <LinearLayout
  android:orientation="vertical"
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  >
   <TextView
    android:id="@+id/longitude"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="Longitude:"
   />
   <TextView
    android:id="@+id/latitude"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="Latitude:"
   />
  </LinearLayout>
 </LinearLayout>
 <com.google.android.maps.MapView
  android:id="@+id/mapview"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent"
  android:clickable="true"
  android:apiKey="-----Your Own API Key here-------------"
 />
</LinearLayout>

Modify AndroidLocation.java, remove all myZoomBar related code, and add the code
myMapView.setBuiltInZoomControls(true);

package com.AndroidLocation;

import com.google.android.maps.GeoPoint;
import com.google.android.maps.MapActivity;
import com.google.android.maps.MapController;
import com.google.android.maps.MapView;

import android.content.Context;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.view.View;
import android.widget.CheckBox;
import android.widget.TextView;
import android.widget.Toast;

public class AndroidLocation extends MapActivity {

 private LocationManager myLocationManager;
 private LocationListener myLocationListener;
 private TextView myLongitude, myLatitude;
 private CheckBox mySatellite;
 
 private MapView myMapView;
 
 private MapController myMapController;

 private void CenterLocation(GeoPoint centerGeoPoint)
 {
  myMapController.animateTo(centerGeoPoint);
  
 
  myLongitude.setText("Longitude: "+
    String.valueOf((float)centerGeoPoint.getLongitudeE6()/1000000)
    );
  myLatitude.setText("Latitude: "+
    String.valueOf((float)centerGeoPoint.getLatitudeE6()/1000000)
    );
 };
 
 private void SetSatellite()
 {
  myMapView.setSatellite(mySatellite.isChecked());
 };

 /** Called when the activity is first created. */
 @Override
 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.main);
  
  myMapView = (MapView)findViewById(R.id.mapview);
  
  myMapView.setBuiltInZoomControls(true);

  
  myLongitude = (TextView)findViewById(R.id.longitude);
  myLatitude = (TextView)findViewById(R.id.latitude);
  mySatellite = (CheckBox)findViewById(R.id.satellite);
  
  SetSatellite();
  myMapController = myMapView.getController();

  myLocationManager = (LocationManager)getSystemService(
    Context.LOCATION_SERVICE);

  myLocationListener = new MyLocationListener();

  myLocationManager.requestLocationUpdates(
    LocationManager.GPS_PROVIDER,
    0,
    0,
    myLocationListener);
  
  //Get the current location in start-up
  //check LastKnownLocation, if not valid, skip it.
  Location initLocation=myLocationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
  if(initLocation != null)
  {
   GeoPoint initGeoPoint = new GeoPoint(
     (int)(initLocation.getLatitude()*1000000),
     (int)(initLocation.getLongitude()*1000000));
   CenterLocation(initGeoPoint);
  }
  mySatellite.setOnClickListener(mySatelliteOnClickListener);
 }
 
 private CheckBox.OnClickListener mySatelliteOnClickListener =
  new CheckBox.OnClickListener(){

   public void onClick(View v) {
    // TODO Auto-generated method stub
    SetSatellite();
   }
  
 };
 

 private class MyLocationListener implements LocationListener{

  public void onLocationChanged(Location argLocation) {
   // TODO Auto-generated method stub
   GeoPoint myGeoPoint = new GeoPoint(
     (int)(argLocation.getLatitude()*1000000),
     (int)(argLocation.getLongitude()*1000000));
   
   CenterLocation(myGeoPoint);
  }

  public void onProviderDisabled(String provider) {
   // TODO Auto-generated method stub
  }

  public void onProviderEnabled(String provider) {
   // TODO Auto-generated method stub
  }

  public void onStatusChanged(String provider,
    int status, Bundle extras) {
   // TODO Auto-generated method stub
  }
 }

 @Override
 protected boolean isRouteDisplayed() {
  // TODO Auto-generated method stub
  return false;
 };
}

Download the files.

AndroidLocation: with a CheckBox to toggle MapView.setSatellite()

2009-11-11T09:58:00.001-08:00

Modify previous exercise AndroidLocation with Zoom Level Control, using SeekBar, to have a CheckBox used to toggle "satellite" mode.

main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
 <LinearLayout
  android:orientation="horizontal"
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  >
  <LinearLayout
  android:orientation="vertical"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  >
   <CheckBox
   android:id="@+id/satellite"
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:text=" Satellite "
   />
 </LinearLayout>
 <LinearLayout
   android:orientation="vertical"
   android:layout_width="fill_parent"
   android:layout_height="wrap_content"
   >
   <TextView
   android:id="@+id/longitude"
   android:layout_width="fill_parent"
   android:layout_height="wrap_content"
   android:text="Longitude:"
  />
  <TextView
  android:id="@+id/latitude"
  android:layout_width="fill_parent"
   android:layout_height="wrap_content"
   android:text="Latitude:"
  />
 </LinearLayout>
 </LinearLayout>
<SeekBar
 android:id="@+id/zoombar"
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  android:max="20"
  android:progress="0"/>
<com.google.android.maps.MapView
 android:id="@+id/mapview"
 android:layout_width="fill_parent"
  android:layout_height="fill_parent"
  android:clickable="false"
 android:apiKey="-----Your Own API Key here-------------"
 />
</LinearLayout>

AndroidLocation.java

package com.AndroidLocation;

import com.google.android.maps.GeoPoint;
import com.google.android.maps.MapActivity;
import com.google.android.maps.MapController;
import com.google.android.maps.MapView;

import android.content.Context;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.view.View;
import android.widget.CheckBox;
import android.widget.SeekBar;
import android.widget.TextView;
import android.widget.Toast;

public class AndroidLocation extends MapActivity {

private LocationManager myLocationManager;
private LocationListener myLocationListener;
private TextView myLongitude, myLatitude;
private CheckBox mySatellite;

private MapView myMapView;
private SeekBar myZoomBar;

private MapController myMapController;

private void CenterLocation(GeoPoint centerGeoPoint)
{
 myMapController.animateTo(centerGeoPoint);


 myLongitude.setText("Longitude: "+
   String.valueOf((float)centerGeoPoint.getLongitudeE6()/1000000)
   );
 myLatitude.setText("Latitude: "+
   String.valueOf((float)centerGeoPoint.getLatitudeE6()/1000000)
   );
};

private void SetZoomLevel()
{
 int myZoomLevel = myZoomBar.getProgress()+1;
 myMapController.setZoom(myZoomLevel);
 Toast.makeText(this,
   "Zoom Level : " + String.valueOf(myZoomLevel),
   Toast.LENGTH_LONG).show();
};

private void SetSatellite()
{
 myMapView.setSatellite(mySatellite.isChecked());
};

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.main);
 myMapView = (MapView)findViewById(R.id.mapview);
 myLongitude = (TextView)findViewById(R.id.longitude);
 myLatitude = (TextView)findViewById(R.id.latitude);
 myZoomBar = (SeekBar)findViewById(R.id.zoombar);
 mySatellite = (CheckBox)findViewById(R.id.satellite);

 SetSatellite();
 myMapController = myMapView.getController();
 SetZoomLevel();

 myLocationManager = (LocationManager)getSystemService(
   Context.LOCATION_SERVICE);

 myLocationListener = new MyLocationListener();

 myLocationManager.requestLocationUpdates(
   LocationManager.GPS_PROVIDER,
   0,
   0,
   myLocationListener);

 //Get the current location in start-up
 //check LastKnownLocation, if not valid, skip it.
 Location initLocation=myLocationManager.getLastKnownLocation(
                 LocationManager.GPS_PROVIDER);
 if(initLocation != null)
 {
  GeoPoint initGeoPoint = new GeoPoint(
    (int)(initLocation.getLatitude()*1000000),
    (int)(initLocation.getLongitude()*1000000));
  CenterLocation(initGeoPoint);
 }
 myZoomBar.setOnSeekBarChangeListener(myZoomBarOnSeekBarChangeListener);
 mySatellite.setOnClickListener(mySatelliteOnClickListener);
}

private CheckBox.OnClickListener mySatelliteOnClickListener =
 new CheckBox.OnClickListener(){

  public void onClick(View v) {
   // TODO Auto-generated method stub
   SetSatellite();
  }

};

private SeekBar.OnSeekBarChangeListener myZoomBarOnSeekBarChangeListener =
 new SeekBar.OnSeekBarChangeListener(){

  public void onProgressChanged(SeekBar seekBar, int progress,
    boolean fromUser) {
   // TODO Auto-generated method stub
   SetZoomLevel();
  }

  public void onStartTrackingTouch(SeekBar seekBar) {
   // TODO Auto-generated method stub
  
  }

  public void onStopTrackingTouch(SeekBar seekBar) {
   // TODO Auto-generated method stub
  
  }

};

private class MyLocationListener implements LocationListener{

 public void onLocationChanged(Location argLocation) {
  // TODO Auto-generated method stub
  GeoPoint myGeoPoint = new GeoPoint(
    (int)(argLocation.getLatitude()*1000000),
    (int)(argLocation.getLongitude()*1000000));
 
  CenterLocation(myGeoPoint);
 }

 public void onProviderDisabled(String provider) {
  // TODO Auto-generated method stub
 }

 public void onProviderEnabled(String provider) {
  // TODO Auto-generated method stub
 }

 public void onStatusChanged(String provider,
   int status, Bundle extras) {
  // TODO Auto-generated method stub
 }
}

@Override
protected boolean isRouteDisplayed() {
 // TODO Auto-generated method stub
 return false;
};
}

Download the files.

AndroidLocation with Zoom Level Control, using SeekBar

2009-11-10T09:56:00.000-08:00

Further works on last exercise, MapView to center on the current location from GPS. A SeekBar to change Zoom Level is implemented. Also add valid checking in Start-up Location, skip if invalid; to prevent from Unexpected Stop.

Modify main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:orientation="vertical"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent"
  > 
 <LinearLayout
  android:orientation="vertical"
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  >
   <TextView
    android:id="@+id/longitude"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="Longitude:"
  />
  <TextView
   android:id="@+id/latitude"
   android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="Latitude:"
  />
   <SeekBar
   android:id="@+id/zoombar"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:max="20"
    android:progress="0"/>
 </LinearLayout>
 <com.google.android.maps.MapView
  android:id="@+id/mapview"
  android:layout_width="fill_parent"
   android:layout_height="fill_parent"
   android:clickable="false"
  android:apiKey="-----Your Own API Key here-------------"
 />
</LinearLayout>

AndroidLocation.java

package com.AndroidLocation;

import com.google.android.maps.GeoPoint;
import com.google.android.maps.MapActivity;
import com.google.android.maps.MapController;
import com.google.android.maps.MapView;

import android.content.Context;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.widget.SeekBar;
import android.widget.TextView;
import android.widget.Toast;

public class AndroidLocation extends MapActivity {

 private LocationManager myLocationManager;
 private LocationListener myLocationListener;
 private TextView myLongitude, myLatitude;
 
 private MapView myMapView;
 private SeekBar myZoomBar;
 
 private MapController myMapController;

 private void CenterLocation(GeoPoint centerGeoPoint)
 {
  myMapController.animateTo(centerGeoPoint);
  
 
  myLongitude.setText("Longitude: "+
   String.valueOf((float)centerGeoPoint.getLongitudeE6()/1000000)
   );
  myLatitude.setText("Latitude: "+
   String.valueOf((float)centerGeoPoint.getLatitudeE6()/1000000)
   );
 };
 
 private void SetZoomLevel()
 {
  int myZoomLevel = myZoomBar.getProgress()+1;
  myMapController.setZoom(myZoomLevel);
  Toast.makeText(this,
    "Zoom Level : " + String.valueOf(myZoomLevel),
    Toast.LENGTH_LONG).show();
 };

 /** Called when the activity is first created. */
 @Override
 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.main);
  myMapView = (MapView)findViewById(R.id.mapview);
  myLongitude = (TextView)findViewById(R.id.longitude);
  myLatitude = (TextView)findViewById(R.id.latitude);
  myZoomBar = (SeekBar)findViewById(R.id.zoombar);
  
  myMapView.setSatellite(true); //Set satellite view
  myMapController = myMapView.getController();
  SetZoomLevel();

  myLocationManager = (LocationManager)getSystemService(
    Context.LOCATION_SERVICE);

  myLocationListener = new MyLocationListener();

  myLocationManager.requestLocationUpdates(
    LocationManager.GPS_PROVIDER,
    0,
    0,
    myLocationListener);
  
  //Get the current location in start-up
  //check LastKnownLocation, if not valid, skip it.
  Location initLocation=
   myLocationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
  if(initLocation != null)
  {
   GeoPoint initGeoPoint = new GeoPoint(
     (int)(initLocation.getLatitude()*1000000),
     (int)(initLocation.getLongitude()*1000000));
   CenterLocation(initGeoPoint);
  }
  myZoomBar.setOnSeekBarChangeListener(myZoomBarOnSeekBarChangeListener);
 }
 
 private SeekBar.OnSeekBarChangeListener myZoomBarOnSeekBarChangeListener =
  new SeekBar.OnSeekBarChangeListener(){

   public void onProgressChanged(SeekBar seekBar, int progress,
     boolean fromUser) {
    // TODO Auto-generated method stub
    SetZoomLevel();
   }

   public void onStartTrackingTouch(SeekBar seekBar) {
    // TODO Auto-generated method stub
    
   }

   public void onStopTrackingTouch(SeekBar seekBar) {
    // TODO Auto-generated method stub
    
   }
  
 };

 private class MyLocationListener implements LocationListener{

  public void onLocationChanged(Location argLocation) {
   // TODO Auto-generated method stub
   GeoPoint myGeoPoint = new GeoPoint(
    (int)(argLocation.getLatitude()*1000000),
    (int)(argLocation.getLongitude()*1000000));
   
   CenterLocation(myGeoPoint);
  }

  public void onProviderDisabled(String provider) {
   // TODO Auto-generated method stub
  }

  public void onProviderEnabled(String provider) {
   // TODO Auto-generated method stub
  }

  public void onStatusChanged(String provider,
    int status, Bundle extras) {
   // TODO Auto-generated method stub
  }
 }

 @Override
 protected boolean isRouteDisplayed() {
  // TODO Auto-generated method stub
  return false;
 };
}

Download the files.

MapView to center on the current location from GPS

2009-11-09T12:48:00.000-08:00

In the article Read GPS location, LocationManager described how to get current location from GPS.
In the article A minimal Map application using MapActivity, described how to implemented a MapView with MapActiity.

In this article, both exercises are merged to have a MapView, which will center in the current location from GPS.

Please note that the application cannot be run directly, you have to have your own API Key to using the GPS API. Refer to the article A minimal Map application using MapActivity to obtain API Key.

Modify AndroidManifest.xml:
Add <uses-library android:name="com.google.android.maps" /> as a child of the <application> element.
Add <uses-permission android:name="android.permission.INTERNET" />
and <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" /> as children of the <manifest> element.

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="com.AndroidLocation"
     android:versionCode="1"
     android:versionName="1.0">
   <application android:icon="@drawable/icon" android:label="@string/app_name">
       <activity android:name=".AndroidLocation"
                 android:label="@string/app_name">
           <intent-filter>
               <action android:name="android.intent.action.MAIN" />
               <category android:name="android.intent.category.LAUNCHER" />
           </intent-filter>
       </activity>
  <uses-library android:name="com.google.android.maps" />
   </application>
   <uses-permission android:name="android.permission.INTERNET" />
   <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
   <uses-sdk android:minSdkVersion="5" />
</manifest>

Modify main.xml to have a MapView

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
   android:orientation="vertical"
   android:layout_width="fill_parent"
   android:layout_height="fill_parent"
   > 
 <LinearLayout
   android:orientation="vertical"
   android:layout_width="fill_parent"
   android:layout_height="wrap_content"
   >
    <TextView
     android:id="@+id/longitude"
     android:layout_width="fill_parent"
     android:layout_height="fill_parent"
     android:text="Longitude:"
  />
  <TextView
   android:id="@+id/latitude"
   android:layout_width="fill_parent"
     android:layout_height="fill_parent"
     android:text="Latitude:"
  />
 </LinearLayout>
 <com.google.android.maps.MapView
  android:id="@+id/mapview"
  android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:clickable="false"
  android:apiKey="-----Your Own API Key here-------------"
 />
</LinearLayout>

Finally, modify AndroidLocation.java

package com.AndroidLocation;

import com.google.android.maps.GeoPoint;
import com.google.android.maps.MapActivity;
import com.google.android.maps.MapController;
import com.google.android.maps.MapView;

import android.content.Context;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.widget.TextView;

public class AndroidLocation extends MapActivity {

 private LocationManager myLocationManager;
 private LocationListener myLocationListener;
 private TextView myLongitude, myLatitude;
 
 private MapView myMapView;
 
 private MapController myMapController;

 private void CenterLocatio(GeoPoint centerGeoPoint)
 {
  myMapController.animateTo(centerGeoPoint);
  
 
  myLongitude.setText("Longitude: "+
   String.valueOf((float)centerGeoPoint.getLongitudeE6()/1000000)
   );
  myLatitude.setText("Latitude: "+
   String.valueOf((float)centerGeoPoint.getLatitudeE6()/1000000)
   );
 };

 /** Called when the activity is first created. */
 @Override
 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.main);
  myMapView = (MapView)findViewById(R.id.mapview);
  myLongitude = (TextView)findViewById(R.id.longitude);
  myLatitude = (TextView)findViewById(R.id.latitude);
  myMapView.setSatellite(true); //Set satellite view
  myMapController = myMapView.getController();
  myMapController.setZoom(20); //Fixed Zoom Level

  myLocationManager = (LocationManager)getSystemService(
    Context.LOCATION_SERVICE);

  myLocationListener = new MyLocationListener();

  myLocationManager.requestLocationUpdates(
    LocationManager.GPS_PROVIDER,
    0,
    0,
    myLocationListener);
  
  //Get the current location in start-up
  GeoPoint initGeoPoint = new GeoPoint(
   (int)(myLocationManager.getLastKnownLocation(
    LocationManager.GPS_PROVIDER)
    .getLatitude()*1000000),
   (int)(myLocationManager.getLastKnownLocation(
    LocationManager.GPS_PROVIDER)
    .getLongitude()*1000000));
   CenterLocatio(initGeoPoint);
 }

 private class MyLocationListener implements LocationListener{

  public void onLocationChanged(Location argLocation) {
   // TODO Auto-generated method stub
   GeoPoint myGeoPoint = new GeoPoint(
    (int)(argLocation.getLatitude()*1000000),
    (int)(argLocation.getLongitude()*1000000));
   
   CenterLocatio(myGeoPoint);
  }

  public void onProviderDisabled(String provider) {
   // TODO Auto-generated method stub
  }

  public void onProviderEnabled(String provider) {
   // TODO Auto-generated method stub
  }

  public void onStatusChanged(String provider,
    int status, Bundle extras) {
   // TODO Auto-generated method stub
  }
 }

 @Override
 protected boolean isRouteDisplayed() {
  // TODO Auto-generated method stub
  return false;
 };
}

Download the files.

Also refer Enable "Use wireless networks" and "Use GPS satellites" in Android Emulator and Change GPS location of Android Emulator.





Because te application read location in start-up, 
so you have to send GPS Location to Android Emulator 
at least once before the application start.

Edited@11-11-2009

Enable "Use wireless networks" and "Use GPS satellites" in Android Emulator

2009-11-08T07:09:00.000-08:00

To let your application to access networks and GPS, you have to enable it in Android Emulator.

Start Android Emulator, press MENU key in Home Screen, and Click Settings.

Select Location & security.

Enable Use wireless networks and Use GPS satellites

Change GPS location of Android Emulator

2009-11-06T12:25:00.000-08:00

In order to test GPS function of a Android Application, DDMS of Android SDK can help to change GPS location of Android Emuator.

Change to DDMS in Eclipse:
Click Window->Open Perspective->DDMS

Scroll down in Emulator Control on the left, till Location Controls

type in Longitude and Latitude, and click Send.

Read GPS location, LocationManager

2009-11-06T12:08:00.000-08:00

It's a activity implement LocationListener. When location changed, the method onLocationChanged() will be called-back.

Create a activity AndroidLocation

To let your application to access GPS function, ACCESS_FINE_LOCATION permission is needed. Add the code
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
to AndroidManifest.xml.

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.AndroidLocation"
android:versionCode="1"
android:versionName="1.0">
<application android:icon="@drawable/icon" android:label="@string/app_name">
<activity android:name=".AndroidLocation"
          android:label="@string/app_name">
    <intent-filter>
        <action android:name="android.intent.action.MAIN" />
        <category android:name="android.intent.category.LAUNCHER" />
    </intent-filter>
</activity>

</application>
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-sdk android:minSdkVersion="5" />
</manifest>

Modify main.xml to have 2 TextView to show location from GPS.

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/hello"
/>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Latitude:"
/>
<TextView
android:id="@+id/Latitude"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Longitude:"
/>
<TextView
android:id="@+id/Longitude"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
</LinearLayout>

Modify the source Code, AndroidLocation.java:

package com.AndroidLocation;

import android.app.Activity;
import android.content.Context;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.widget.TextView;

public class AndroidLocation extends Activity {

private LocationManager myLocationManager;
private LocationListener myLocationListener;
private TextView myLatitude, myLongitude;


/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
myLatitude = (TextView)findViewById(R.id.Latitude);
myLongitude = (TextView)findViewById(R.id.Longitude);

myLocationManager = (LocationManager)getSystemService(
  Context.LOCATION_SERVICE);

myLocationListener = new MyLocationListener();

myLocationManager.requestLocationUpdates(
        LocationManager.GPS_PROVIDER,
        0,
        0,
        myLocationListener);

//Get the current location in start-up
myLatitude.setText(String.valueOf(
  myLocationManager.getLastKnownLocation(
    LocationManager.GPS_PROVIDER).getLatitude()));

myLongitude.setText(String.valueOf(
 myLocationManager.getLastKnownLocation(
   LocationManager.GPS_PROVIDER).getLongitude()));

}

private class MyLocationListener implements LocationListener{

public void onLocationChanged(Location argLocation) {
// TODO Auto-generated method stub
myLatitude.setText(String.valueOf(
  argLocation.getLatitude()));
myLongitude.setText(String.valueOf(
  argLocation.getLongitude()));
}

public void onProviderDisabled(String provider) {
// TODO Auto-generated method stub
}

public void onProviderEnabled(String provider) {
// TODO Auto-generated method stub
}

public void onStatusChanged(String provider,
 int status, Bundle extras) {
// TODO Auto-generated method stub
}
};
}

Download the files.

May be you have to Enable "Use wireless networks" and "Use GPS satellites" in Android Emulator.

And also Change GPS location of Android Emulator, to test the function of the Application.





Because te application read location in start-up, 
so you have to send GPS Location to Android Emulator 
at least once before the application start.

Edited@11-11-2009

Install Android SDK release 3 on Eclipse 3.5 Galileo, in Ubuntu 9.10

2009-11-05T14:25:00.000-08:00

Both Adroid SDK and ubuntu have new release recently. There is a little bit variation in installation from the old version, so I re-write the installation procedure here. In this article, Eclipse 3.5 Galileo with Android SDK release 3 (for Android 2) will be installed on a fresh new ubuntu 9.10.

Environment:
OS: Linux ubuntu 9.10 for desktop or laptop (http://www.ubuntu.com/)
Eclipse: Eclipse 3.5 Galileo (bundled with ubuntu 9.10)
Android SDK: Android SDK release 3 (http://developer.android.com/)

Install Java:

Start a Terminal and type the command:
$ sudo apt-get install sun-java6-jdk

Download Android SDK:

Download Android SDk release 3 from http://developer.android.com/sdk/index.html, extract to any folder you want. In my case, it is $home/android-sdk-linux/

Install Eclipse:

In ubuntu 9.10, Eclipse 3.5.1 is bundled currently. To install Eclipse on ubuntu, it can be downloaded from http://www.eclipse.org/, installe using Ubuntu Software Center (Application->Ubuntu Software Center in ubuntu menu bar), or installed using Synaptic Package Manager (System->Administration->Synaptic Package Manager in ubuntu menu bar). I tried install using the download version and Ubuntu Software Center, both cannot be installed without error, so Synaptic Package Manager is suggested to install Eclipse.
Involve Synaptic Package Manager from System->Administration of Ubuntu top menu.

Type Eclipse in te Quick search box, select eclipse in the list and mark for installation.

Additional required changes are listed, click Mark to accept.

Click Apply to start installation

Installing the ADT Plugin

Start Eclipse, Click Help->Install New Software... from the top menu.

Click Available Software Sites to check if http://download.eclipse.org/releases/galileo is available. If not, add it.

Add a new site https://dl-ssl.google.com/android/eclipse/

Select https://dl-ssl.google.com/android/eclipse/, and wait a moment. The available will be listed. click to select it and click Next.

Click Next again

Accept the terms and click Finish.

Wait, you will be asked for security warning, click OK.

Wait installation to finish, and accept re-start after finished.

Setup Android SDT inside Eclipse:

Click Window->Preference in Eclipse top menu.

Select Android on the left, and browse to your Android SDK folder, it's $home/android-sdk-linux/ in my setup.

Install Package:

Click Window->Android SDK and AVD Manager

Click Available Package from the left, expend and select your expected packages, and click Install Selected.

Accept All, and Install Accepted.

Restart Again.

Create AVD:
Refer to the article http://android-er.blogspot.com/2009/10/create-avd-for-android-2-sdk.html

Now, the installation is finished.

android.view.animation

2009-11-04T02:36:00.000-08:00

android.view.animation provides classes that handle tweened animations.

In this exercise, animation is applied on a single view (AnalogClock) and on a whole layout (LinearLayout).

The main part is the class ViewAnimation extends Animation; initialize() initialize some setting, applyTransformation() will be called repeatly with difference value of interpolatedTime, between 0 to 1.

main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:id="@+id/mylayout"
 android:orientation="vertical"
 android:layout_width="fill_parent"
 android:layout_height="fill_parent"
 >
 <Button
  android:id="@+id/start1"
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  android:text="Start Animation on LinearLayout"
  />
 <Button
  android:id="@+id/start2"
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  android:text="Start Animation on AnalogClock"
  />
 <AnalogClock
  android:id="@+id/myClock"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  />
</LinearLayout>

AndroidViewAnimation.java

package com.exercise.AndroidViewAnimation;

import android.app.Activity;
import android.graphics.Matrix;
import android.os.Bundle;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.LinearInterpolator;
import android.view.animation.Transformation;
import android.widget.AnalogClock;
import android.widget.Button;
import android.widget.LinearLayout;

public class AndroidViewAnimation extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
     super.onCreate(savedInstanceState);
     setContentView(R.layout.main);
     Button myStartButton1 = (Button)this.findViewById(R.id.start1);
     myStartButton1.setOnClickListener(myStartButton1OnClickListener);
     Button myStartButton2 = (Button)this.findViewById(R.id.start2);
     myStartButton2.setOnClickListener(myStartButton2OnClickListener);
    }

    private Button.OnClickListener myStartButton1OnClickListener =
     new Button.OnClickListener(){

   @Override
   public void onClick(View v) {
    // TODO Auto-generated method stub
    LinearLayout myAnimation = (LinearLayout)findViewById(R.id.mylayout);
       myAnimation.startAnimation(new ViewAnimation());
   }
    };
    
    private Button.OnClickListener myStartButton2OnClickListener =
     new Button.OnClickListener(){

   @Override
   public void onClick(View v) {
    // TODO Auto-generated method stub
    AnalogClock myAnimation = (AnalogClock)findViewById(R.id.myClock);
       myAnimation.startAnimation(new ViewAnimation());
   }
    };
    
    public class ViewAnimation extends Animation
    {
     int centerX, centerY;
     @Override
     public void initialize(int width, int height, int parentWidth,
       int parentHeight)
     {
      super.initialize(width, height, parentWidth, parentHeight);
      setDuration(5000);
      setFillAfter(true);
      setInterpolator(new LinearInterpolator());
      centerX = width/2;
      centerY = height/2;
     }
     
     @Override
  protected void applyTransformation(float interpolatedTime,
    Transformation t) {
   // TODO Auto-generated method stub
      final Matrix matrix = t.getMatrix();
      matrix.setScale(interpolatedTime, interpolatedTime);
  }
    }
}

Download the files.

Cannot complete the install because one or more required items could not be found

2009-11-03T12:33:00.000-08:00

I tried to install Android SDK and Eclipse Galileo on a fresh ubuntu 9.10 and found the error while installing ADT Plugin for Eclipse:

Cannot complete the install because one or more required items could not be found.
Software being installed: Android Development Tools 0.9.4.v200910220141-17704 (com.android.ide.eclipse.adt.feature.group 0.9.4.v200910220141-17704)
Missing requirement: Android Development Tools 0.9.4.v200910220141-17704 (com.android.ide.eclipse.adt.feature.group 0.9.4.v200910220141-17704) requires 'org.eclipse.wst.xml.core 0.0.0' but it could not be found

It's because there are some components missed in the setup, and the Galileo update site is not in the list of Available Software Sites.

To solve the problem:
Add "http://download.eclipse.org/releases/galileo" in the Available Software Sites.

Loading Android Resource in GridView

2009-10-30T07:07:00.000-07:00

Refer to Android document R.drawable, there are a number of System Resources from 17301504 to 17301655.

This exercise modify the last GridView exercise to load the System Resources, instead of loading from /res/drawable.

mThumbIds[] is used to hold the resources id, to be passed to ImageAdapter. It is initialized in initResourceID()in ImageAdapter's constructor.

Each object is passed to to imageView using imageView.setImageResource(mThumbIds[position]) inside getView().

The main.xml is same as that in GridView exercise.

AndroidGridView2.java

package com.exercise.AndroidGridView2;

import android.app.Activity;
import android.content.Context;
import android.content.res.Resources;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.GridView;
import android.widget.ImageView;
import android.widget.Toast;

public class AndroidGridView2 extends Activity {
 
  final int resourceStart = 17301504;
  final int resourceEnd = 17301655;
  final int ResourceLength = resourceEnd - resourceStart + 1; 
 
  /** Called when the activity is first created. */
  @Override
  public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.main);

      GridView gridview = (GridView) findViewById(R.id.gridview);
      gridview.setAdapter(new ImageAdapter(this));
    
      gridview.setOnItemClickListener(gridviewOnItemClickListener);
  }

  private GridView.OnItemClickListener gridviewOnItemClickListener =
   new GridView.OnItemClickListener(){

   @Override
   public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
     long arg3) {
    // TODO Auto-generated method stub
    String strResource =
     arg0.getAdapter().getItem(arg2).toString() +
     " " +
     Resources.getSystem().getResourceName(arg2+resourceStart);
    Toast.makeText(AndroidGridView2.this,
      strResource,
      Toast.LENGTH_LONG).show();
   }
  };


  public class ImageAdapter extends BaseAdapter {
      private Context mContext;

      public ImageAdapter(Context c) {
          mContext = c;
          initResourceID();
      }

      public int getCount() {
          return mThumbIds.length;
      }

      public Object getItem(int position) {
          return mThumbIds[position];
      }

      public long getItemId(int position) {
       return position;
      }

      // create a new ImageView for each item referenced by the Adapter
      public View getView(int position, View convertView, ViewGroup parent) {
          ImageView imageView;
          if (convertView == null) {
           // if it's not recycled, initialize some attributes
              imageView = new ImageView(mContext);
              imageView.setLayoutParams(new GridView.LayoutParams(50, 50));
              imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
              imageView.setPadding(8, 8, 8, 8);
          } else {
              imageView = (ImageView) convertView;
          }

          imageView.setImageResource(mThumbIds[position]);
          return imageView;
      }

      private int[] mThumbIds = new int[ResourceLength];
      private void initResourceID(){
       for ( int i = 0; i < ResourceLength; i++)
       {
        mThumbIds[i] = i + resourceStart;
       }
      }
  }
}

Download the files.

New Ubuntu 9.10

2009-10-29T07:36:00.000-07:00

Ubuntu 9.10 is HERE!

Ubuntu just released the new Ubuntu 9.10.

Refer the article to Install Android SDK release 3 on Eclipse 3.5 Galileo, in Ubuntu 9.10

Android 2.0 Official Video

2009-10-28T15:54:00.000-07:00

Highlights from the latest Android platform release

Hierarchy Viewer

2009-10-28T11:30:00.001-07:00

The Hierarchy Viewer application allows you to debug and optimize your user interface. It provides a visual representation of the layout's View hierarchy (the Layout View) and a magnified inspector of the display (the Pixel Perfect View).

To get the Hierarchy Viewer started:

1. Connect your device or launch an emulator.
2. From a terminal, launch hierarchyviewer from your SDK /tools directory.
3. In the window that opens, you'll see a list of Devices. When a device is selected, a list of currently active Windows is displayed on the right. The "focused window" is the window currently in the foreground, and also the default window loaded if you do not select another.
4. Select the window that you'd like to inspect and click Load View Hierarchy. The Layout View will be loaded. You can then load the Pixel Perfect View by clicking the second icon at the bottom-left of the window.

If you've navigated to a different window on the device, press Refresh Windows to refresh the list of available windows on the right.

GridView

2009-10-28T11:22:00.001-07:00

GridView shows items in two-dimensional scrolling grid. The items in the grid come from the ListAdapter associated with this view.

This exercise show how to implement a GridView to display drawable in /res.

- Create a Android Application, AndroidGridView2 (It's my first time to use Android SDK r3 for Android 2.0). Target Android 2.0 (not necessary).

- Copy some picture files (or download from the file on the end of this text) into the folder /res/drawable-ldpi/ (for Android 2.0) or /res/drawable/ for former version, named drawing_01~14.png

- Modify main.xml to have a GridView.

<?xml version="1.0" encoding="utf-8"?>
<GridView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/gridview"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:numColumns="auto_fit"
android:verticalSpacing="10dp"
android:horizontalSpacing="10dp"
android:columnWidth="90dp"
android:stretchMode="columnWidth"
android:gravity="center"
/>

- Modify AndroidGridView2.java

package com.exercise.AndroidGridView2;

import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.GridView;
import android.widget.ImageView;
import android.widget.Toast;

public class AndroidGridView2 extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
   super.onCreate(savedInstanceState);
   setContentView(R.layout.main);

   GridView gridview = (GridView) findViewById(R.id.gridview);
   gridview.setAdapter(new ImageAdapter(this));

   gridview.setOnItemClickListener(gridviewOnItemClickListener);

}

private GridView.OnItemClickListener gridviewOnItemClickListener =
 new GridView.OnItemClickListener(){

   @Override
   public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
     long arg3) {
    // TODO Auto-generated method stub
    Toast.makeText(AndroidGridView2.this,
      arg0.getAdapter().getItem(arg2).toString(),
      Toast.LENGTH_LONG).show();
   }


};


public class ImageAdapter extends BaseAdapter {
   private Context mContext;

   public ImageAdapter(Context c) {
       mContext = c;
   }

   public int getCount() {
       return mThumbIds.length;
   }

   public Object getItem(int position) {
       return mThumbIds[position];
   }

   public long getItemId(int position) {
    return position;
   }

   // create a new ImageView for each item referenced by the Adapter
   public View getView(int position, View convertView, ViewGroup parent) {
       ImageView imageView;
       if (convertView == null) {
        // if it's not recycled, initialize some attributes
           imageView = new ImageView(mContext);
           imageView.setLayoutParams(new GridView.LayoutParams(85, 85));
           imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
           imageView.setPadding(8, 8, 8, 8);
       } else {
           imageView = (ImageView) convertView;
       }

       imageView.setImageResource(mThumbIds[position]);
       return imageView;
   }

  // references to our images
   private Integer[] mThumbIds = {
           R.drawable.drawing_01,
           R.drawable.drawing_02,
           R.drawable.drawing_03,
           R.drawable.drawing_04,
           R.drawable.drawing_05,
           R.drawable.drawing_06,
           R.drawable.drawing_07,
           R.drawable.drawing_08,
           R.drawable.drawing_09,
           R.drawable.drawing_10,
           R.drawable.drawing_11,
           R.drawable.drawing_12,
           R.drawable.drawing_13,
           R.drawable.drawing_14
   };
}

}

--------------------------------------------------------------------
Little bit advice:
- Set a break point inside getView(), you can know more on the operation of getView, such as when it will be called, and when go to initialize attributes, or load the previous convertView.

- Modify onItemClick() to check the value of arg0, arg1, arg2 & arg3.

In my code, the object ID of the clicked item of the GridView will be displayed on the Toast, in decimal. It's match with the ID of the item in the file R.java, in hexdecimal.

- Try the Tool, hierarchyviewer, it can give you a hierarchy viewer of the current view.
--------------------------------------------------------------------

Download the files.
--------------------------------------------------------------------
Another exercise Loading Android Resource in GridView.

Create AVD for Android 2

2009-10-27T12:16:00.000-07:00

The first step to use new Android SDK Rev.3 is to create a new AVD for Android 2.0

Click Window of Eclipse top menu, select Android SDK and AVD Manager.

Select Virtual Device on the left and click New.

You can see a new and improved Create new AVD dialog. Configure your new AVD, and Create AVD.

upgrade to Android SDK Tools, Revision 3

2009-10-27T11:39:00.000-07:00

If you have already installed Android 1.6 SDK and Eclipse, it's very easy to upgrade to Android SDK Tools, Revision 3. The Android SDK and AVD Manager tool is included in Android 1.6 and later SDK packages.

If NOT yet, follow the procedure in Install Android SDK on Eclipse 3.5 Galileo.

Click Window on top menu of Eclipse, click Android SDK and AVD Manager.

Select Avaolable Package, wait a moments, the available Sources, Packages and Archieves will be shown on the right. Select the components you want.

Accept All

Wait download and install.

After downloaded and installed, you will be asked to restart Eclipse.

After Eclipse restart, you will ne asked to update ADT.

Click Help on top of Eclipse, click Install New Software...

Select the site
https://dl-ssl.google.com/android/eclipse/

It should be already in your list if you have installed Android SDK before. Wait a moment the available ADT will be appear.
Select available ADT and click Next

Next and Accept the terms, and click Finish. And wait installation of the the new ADT.

Restart Eclipse again.

That ALL.

Remember to create a new AVD for Android 2.0

Android 2.0, Release 1

2009-10-27T11:03:00.000-07:00

Android 2.0 is a major platform release deployable to Android-powered handsets starting in November 2009. The release includes new features for users and developers, as well as changes in the Android framework API.

details>>

For a list of new user features and platform highlights, see the Android 2.0 Platform Highlights document.

Create SD Card in Android Emulator and copy files into, in Eclipse, Emulator and DDMS.

2009-10-25T04:21:00.001-07:00

In my previous articles, I described how to Create an SD Card to existing AVD, and Copying Files to a Disk Image in ubuntu host system using text commands in Terminal.

Now, I have another approach using in Eclipse, Emulator and DDMS. May be it's more easy, at least no need to remember the text commands.

Create a new AVD in Eclipse:

- Start Eclipse, click Window on the top menu, and click Android SDK and AVD Manager.

- New a AVD

- Name your new AVD, select Target, type 1000M in SD Card and select skin. Click Create.
note: SD Card must be either a file path or a size such as 128K 0r 64M. type 1000M now to create a SD Card of 1G.

- Select and Start the new AVD.

After the Emulator started, you can close the AVD Manager.

Create folder in SDCard

I can't find any File Manager in Android Emulator. Fortunately, Android Emulator provide a DevTools with Terminal, so you can create a folder using Linux command inside Android Emulator.

- Click the ARROW on the screen to display the available application.

- Click DevTools.

- Scroll down to start Terminal Emulator

- It's the same a terminal in Linux, you can ls to view the current files and folders in your $home.

- Now change into sdcard and create a folder, say pictures.
$cd sdcard
$mkdir pictures

It's the only two line of command in this approach.

Copy files from your host system into Android SDCard

- With the Emulator is running. Now go back to Eclipse, switch to DDMS Perspective

Click the arrow on the menu bar and select DDMS

or

Click Window > Open Perspective > others > to select DDMS

- Select the device in the window on the left, eg. emulator-5554.
(Without select the device, you will fail in copying files into.)

- In DDMS, select File Explorer tag in the window on the right. Expend sdcard folder. Now, you can see the pictures folder in the tree. And also, you can see the Permissions of the folder.

- Select the pictures folder, and click Push a file onto the device .

- Browse to and select the files from your host, to push onto the Android Emulator.

- Further expend the folder pictures, you can see the new file here.

Use mp3 as Notification sound

2009-10-24T09:30:00.000-07:00

In the perviouse article, Status Bar Notifications, Notification is displayed on Status Bar.

To use the user's default sound, add "DEFAULT_SOUND" to the defaults field:

notification.defaults |= Notification.DEFAULT_SOUND;

But...actually, I can't make my Emulator to have any sound using this method. May be there are some setting missed in my Emulator.
(If you know why, please leave me a comment to let me know, thx.)

Alternatively, I use a mp3 file in sdcard as Notification sound.

- Follow my previous articles to Create an SD Card to existing AVD, and Copying Files to a Disk Image, to copy a mp3 file to the root of the sdcard, named sound.card.

- Add the code in the Activity.

notification.sound = Uri.parse("file:///sdcard/sound.mp3");

Status Bar Notifications

2009-10-23T07:06:00.000-07:00

A status bar notification adds an icon to the system's status bar (with an optional ticker-text message) and an expanded message in the "Notifications" window.

After Notification generated, a selected notification icon and Ticket will be displayed on the status bar.

User can reveal the Notifications window by pulling down the status bar (or selecting Notifications from the Home options menu), to view the Title and Content.

Notification can be generated inside Service or Activity. This exercise show the basic steps to generate a Notification in Activity.

The most important class is NotificationManager and Notification.

In the exercise:
android.R.drawable.btn_star_big_on is a drawable icon in Android system resource, you can assign any drawable icon.
when is when the notification should be generated, System.currentTimeMillis() = NOW.
NOTIFICATION_ID is a number which is unique in your application.
contentIntent is the expected intent to handle the notification. It's the own activity in this exercise.

The generated Notification can be cleared by:
NotificationManager.cancel(NOTIFICATION_ID);

Modify main.xml to have two Buttons to generate and clear the Notification

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/hello"
/>
<Button
 android:id="@+id/gen"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="Generate Notification"
/>
<Button
 android:id="@+id/clear"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="Clear Notification"
/>
</LinearLayout>

AndroidNotification.java

package com.exercise.AndroidNotification;

import android.app.Activity;
import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class AndroidNotification extends Activity {

 NotificationManager myNotificationManager;
 private static final int NOTIFICATION_ID = 1;
 
 /** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    Button myGen = (Button)findViewById(R.id.gen);
    myGen.setOnClickListener(myGenOnClickListener);
    Button myClear = (Button)findViewById(R.id.clear);
    myClear.setOnClickListener(myClearOnClickListener);


}

private void GeneratNotification(){
  
  myNotificationManager =
   (NotificationManager)getSystemService(Context.NOTIFICATION_SERVICE);
  
  CharSequence NotificationTicket = "*** Notification";
  CharSequence NotificationTitle = "Attention Please!";
  CharSequence NotificationContent = "- Notification is coming -";
  long when = System.currentTimeMillis();
  
  Notification notification =
   new Notification(android.R.drawable.btn_star_big_on,
     NotificationTicket, when);
    
  Context context = getApplicationContext();

  Intent notificationIntent = new Intent(this,
   AndroidNotification.class);
  PendingIntent contentIntent =
   PendingIntent.getActivity(this, 0, notificationIntent, 0);

  notification.setLatestEventInfo(context, NotificationTitle,
    NotificationContent, contentIntent);
  
  myNotificationManager.notify(NOTIFICATION_ID, notification);

}

Button.OnClickListener myGenOnClickListener =
 new Button.OnClickListener(){

  @Override
  public void onClick(View v) {
   // TODO Auto-generated method stub
   GeneratNotification();
  }
 
};

Button.OnClickListener myClearOnClickListener =
 new Button.OnClickListener(){

  @Override
  public void onClick(View v) {
   // TODO Auto-generated method stub
   myNotificationManager.cancel(NOTIFICATION_ID);
  }
 
};
}

Download the files.

CheckBox

2009-10-22T08:41:00.000-07:00

A checkbox is a specific type of two-states button that can be either checked or unchecked.

Modify the main.xml with two CheckBox and a Button.

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:orientation="vertical"
 android:layout_width="fill_parent"
 android:layout_height="fill_parent"
 >
<TextView
 android:layout_width="fill_parent"
 android:layout_height="wrap_content"
 android:text="@string/hello"
 />
<CheckBox
 android:id="@+id/option1"
 android:layout_width="fill_parent"
 android:layout_height="wrap_content"
 android:text="Option 1"
 />
<CheckBox
 android:id="@+id/option2"
 android:layout_width="fill_parent"
 android:layout_height="wrap_content"
 android:text="Option 2"
 />
<Button
 android:id="@+id/OK"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:layout_gravity="center"
 android:text="OK"
 />
</LinearLayout>

Modify the code to read and show the CheckBox's status.

package com.exercise.AndroidCheckBox;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.Toast;

public class AndroidCheckBox extends Activity {
 
 CheckBox myOption1, myOption2;
 
 /** Called when the activity is first created. */
 @Override
 public void onCreate(Bundle savedInstanceState) {
     super.onCreate(savedInstanceState);
     setContentView(R.layout.main);
  
     myOption1 = (CheckBox)findViewById(R.id.option1);
     myOption2 = (CheckBox)findViewById(R.id.option2);
     Button myOK = (Button)findViewById(R.id.OK);
     myOK.setOnClickListener(new Button.OnClickListener(){

   @Override
   public void onClick(View v) {
    // TODO Auto-generated method stub
    Toast.makeText(AndroidCheckBox.this,
      (CharSequence)(
      "Option1 = " + myOption1.isChecked() +
      " " +
      "Option2 = " + myOption2.isChecked()),
      Toast.LENGTH_LONG).show();
   }
      
     });
  
 }
}

Download the files.

ListActivity with @android:id/list and empty

2009-10-20T02:26:00.001-07:00

Normally, ListActivity has a default layout that consists of a single, full-screen list in the center of the screen. However, if you desire, you can customize the screen layout by setting your own view layout with setContentView() in onCreate(). To do this, your own view MUST contain a ListView object with the id "@android:id/list".

In some case if the list is empty, the screen will become nothing. If you want to prompt the user if the list is empty, @android:id/list and @android:id/empty can be used.

Create a new AndroidEmptyListActivity extends ListActivity.

package com.exercise.AndroidEmptyListActivity;

import android.app.ListActivity;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.ListView;

public class AndroidEmptyListActivity extends ListActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
 // TODO Auto-generated method stub
 super.onCreate(savedInstanceState);

 setContentView(R.layout.main);
 SetupListView();
}

  private void SetupListView()
  {

   String[] listItems = new String[] {
     "Hello!",
     "It's a Demo to use ListActivity,",
     "with list/empty...",
     "Is it Great?",
     "android-er.blogspot.com"
   };
 
   /*
   String[] listItems = new String[] {
   };
   */

   ArrayAdapter<String> listItemAdapter
     = new ArrayAdapter<String>(
       this,
       android.R.layout.simple_list_item_1,
       listItems);
   
   ListView lv = (ListView)this.findViewById(android.R.id.list);
   lv.setAdapter(listItemAdapter);
  }
}

Modify the main.xml to have a ListView with android:id="@android:id/list", and a TextView android:id="@android:id/empty".

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:orientation="vertical"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent"
  >
<ListView android:id="@android:id/list"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"/>
<TextView android:id="@android:id/empty"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:text="List is Empty"/>
</LinearLayout>

If the List is not empty, the ListView will be shown, otherwise TextView will be shown.

Download the files.

ListView with more items on each entry, using SimpleAdapter

2009-10-19T13:37:00.000-07:00

In the previous articles of ListView, ArrayAdapter are used. Only one item can be display on each entry.

In this article, SimpleAdapter is used. Such that we have more than one items on each entry.

It's a ListActivity list the ASCII symbols from 32 to 126, in which there are two items, the code and the symbol, will be display on each entry.

The ASCII symbols are converted using EncodingUtils.getAsciiString().

We have a List to hold the code:symbol pair for each entry, and use SimpleAdapter to adapte to the ListView.

All we need is two files only
/res/row.xml, which is the layout of each entry on the ListView

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  android:orientation="horizontal">  

  <TextView
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:text = " " />
  <TextView android:id="@+id/code"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"/>
  <TextView
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:text = " : " />
  <TextView android:id="@+id/symbol"
          android:layout_width="fill_parent"
          android:layout_height="wrap_content"/>
</LinearLayout>

AndroidAscii.java

package com.exercise.AndroidAscii;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.apache.http.util.EncodingUtils;

import android.app.ListActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.Toast;

public class AndroidAscii extends ListActivity
{
  public void onCreate(Bundle savedInstanceState)
  {
      super.onCreate(savedInstanceState);

      List<Map<String, CharSequence>> asciiPair =
          new ArrayList<Map<String, CharSequence>>();

      Map<String, CharSequence> asciidata;

      for ( int i = 32; i <= 126; i++ )
      {
          asciidata = new HashMap<String, CharSequence>();
        
          String strCode = String.valueOf(i);
        
          byte[] data = {(byte) i};
          CharSequence strSymbol = EncodingUtils.getAsciiString(data);

          asciidata.put("Code", strCode );
          asciidata.put("Symbol", strSymbol );
          asciiPair.add(asciidata);
      }

      SimpleAdapter AsciiAdapter = new SimpleAdapter(
          this,
          asciiPair,
          R.layout.row,
          new String[] { "Code", "Symbol" },
          new int[] { R.id.code, R.id.symbol } );

      setListAdapter(AsciiAdapter);
  }

 @Override
 protected void onListItemClick(ListView l, View v, int position, long id) {
  // TODO Auto-generated method stub
  super.onListItemClick(l, v, position, id);
  
  String myAscii = l.getItemAtPosition(position).toString();
  Toast.makeText(this, myAscii, Toast.LENGTH_LONG).show();
 }
}

Download the files.

ListView and ListActivity, with Layout Animation

2009-10-16T08:12:00.000-07:00

In the article Layout Animation, list_layout_controller is included in layout, main.xml. In the last article ListView and ListActivity, ListView is implemented as ListActivity, without XML file for layout. How can apply the LayoutAnimationController.

In this article, the same visual effect of Layout Animation will be applied on ListView and ListActivity.

- Follow the last exercise, ListView and ListActivity.

- Same as Layout Animation, create the folder /res/anim and add the files list_layout_controller.xml and scale.xml.

list_layout_controller.xml

<layoutAnimation xmlns:android="http://schemas.android.com/apk/res/android"
 android:delay="50%"
 android:animation="@anim/scale" />

scale.xml

<set xmlns:android="http://schemas.android.com/apk/res/android"
android:interpolator="@android:anim/accelerate_interpolator">
<scale
 android:fromXScale="0.1"
 android:toXScale="1"
 android:fromYScale="0.1"
 android:toYScale="1.0"
 android:duration="2000"
 android:pivotX="10%"
 android:pivotY="10%"
 android:startOffset="100" />
</set>

- Modify AndroidListActivity.java to add two lines of code in onCreate()

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  // TODO Auto-generated method stub
  super.onCreate(savedInstanceState);
  
  setListAdapter(new ArrayAdapter<String>(this,
            android.R.layout.simple_list_item_1, COUNTRIES));
  getListView().setTextFilterEnabled(true);
  
  LayoutAnimationController controller 
   = AnimationUtils.loadLayoutAnimation(
     this, R.anim.list_layout_controller);
  getListView().setLayoutAnimation(controller);

 }

That's!