http://googleblog.blogspot.jp/2013/03/a-second-spring-of-cleaning.html

We launched Google Reader in 2005 in an effort to make it easy for people to discover and keep tabs on their favorite websites. While the product has a loyal following, over the years usage has declined. So, on July 1, 2013, we will retire Google Reader. Users and developers interested in RSS alternatives can export their data, including their subscriptions, with Google Takeout over the course of the next four months

Being able to use code in order to get your phone to do a variety of different things can result in the odd error or you having to learn a bit more or try again in order to get things going the way you want them to, but it’s also a great way to learn more about code and even step into the realm of developing your own scripts to get your phone to perform a wide variety of different functions. 

It’s not going to be a walk in the park – there is a lot of knowledge to soak up, and the best coders in the world would never say that they know how to do everything. But working with code is largely problem-solving and figuring out how to get from A to B, and luckily for you, there are many examples of working scripts that you can deconstruct and learn from on this site, not to mention use to get more out of your phone! 

So if you are curious about unlocking the potential of your device and you don’t mind putting the work in in order to do that, then you’re going to have a great time working with code and scripts. No longer will your device be like every other model – you’ll own a master key to unlock the hidden power of your smartphone. Go code, and have fun! 

  package com.example.test; import android.app.Activity; import android.os.Bundle; import android.widget.ArrayAdapter; import android.widget.Spinner; public class HelloSpinner extends Activity (@ Overridepublic void onCreate (Bundle savedInstanceState) ( super.onCreate (savedInstanceState); setContentView (R.layout.main); Spinner s = (Spinner) findViewById (R.id.spinner); ArrayAdapter adapter = ArrayAdapter.createFromResource (this, R.array.planets, android.R. layout.simple_spinner_item); adapter.setDropDownViewResource (android.R.layout.simple_spinner_dropdown_item); s.setAdapter (adapter);)) 

layout-> main.xml

  <? xml version = "1.0" encoding = "utf-8"?> <LinearLayout xmlns: android = "http://schemas.android.com/apk/res/android" android: orientation = "vertical" android: padding = "10dip" android: layout_width = "fill_parent" android: layout_height = "wrap_content"> <TextView android: layout_width = "fill_parent" android: layout_height = "wrap_content" android: layout_marginTop = "10dip" android: text = "Please select a planet: "/> <Spinner android: id =" @ + id / spinner "android: layout_width =" fill_parent "android: layout_height =" wrap_content "android: drawSelectorOnTop =" true "android: prompt =" @ string / planet_prompt "/ > </ LinearLayout> 

values-> arrays.xml

  <resources> <string-array name="planets"> <item> Mercury </ item> <item> Venus </ item> <item> Earth </ item> <item> Mars </ item> <item> Jupiter < / item> <item> Saturn </ item> <item> Uranus </ item> <item> Neptune </ item> </ string-array> </ resources> 

value-> strings.xml

  <? xml version = "1.0" encoding = "utf-8"?> <resources> <string name="hello"> Hello World, HelloSpinner! </ string> <string name="app_name"> HelloSpinner </ string> <string name="planet_prompt"> Choose a planet </ string> </ resources> 

run it

  findViewById (R.id.myButton). setOnClickListener (new View.OnClickListener () (public void onClick (View v) (/ / Do stuff))); 

Add a Listener using the above method has a drawback is that if control is too large, Listener will increase the number, so the following tips can be used to reduce the number of Listener:

  View.OnClickListener handler = View.OnClickListener () (public void onClick (View v) (switch (v.getId ()) (case R.id.Button01: / / doStuff break; case R.id.Button02: / / doStuff break;))) findViewById (R.id.myButton). setOnClickListener (handler); findViewById (R.id.myOtherButton). setOnClickListener (handler); 

The Android1.6 inside, add the Listener's work has become fairly simple (feeling more like doing web programming!), Concrete steps are as follows:

1. First, the definition in the layout inside the Button and specify the response Listener

  <? 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: text = "Button01" android : id = "@ + id/Button01" android: layout_width = "wrap_content" android: layout_height = "wrap_content" android: onClick = "myClickHandler01" /> <Button android: text = "Button02" android: id = "@ + id / Button02 "android: layout_width =" wrap_content "android: layout_height =" wrap_content "android: onClick =" myClickHandler02 "/> <TextView android: layout_width =" fill_parent "android: layout_height =" wrap_content "android: text =" @ string / hello "/> </ LinearLayout> 

These two lines of which the following are new features:

android: onClick = "myClickHandler01"

android: onClick = "myClickHandler02"

2. In the event inside the definition of public methods myClickHandler01, and myClickHandler02 (Note that these two methods must have a View of the shape parameter).

  package com.ray.test; import android.app.Activity; import android.os.Bundle; import android.view.View; public class TestOnClickListener extends Activity (@ Override public void onCreate (Bundle savedInstanceState) (super.onCreate (savedInstanceState) ; setContentView (R.layout.main);) public void myClickHandler01 (View target) (setTitle ( "myClickHandler01");) public void myClickHandler02 (View target) (setTitle ( "myClickHandler02");)) 

Of course, you can also use this wording:

The two buttons set to the same Listener

android: onClick = "myClickHandler"

android: onClick = "myClickHandler"

  package com.ray.test; import android.app.Activity; import android.os.Bundle; import android.view.View; public class TestOnClickListener extends Activity (@ Override public void onCreate (Bundle savedInstanceState) (super.onCreate (savedInstanceState) ; setContentView (R.layout.main);) public void myClickHandler (View target) (switch (target.getId ()) (case R.id.Button01: setTitle ( "myClickHandler01"); break; case R.id.Button02 : setTitle ( "myClickHandler02"); break;))) 

Refer to the article: "UI framework changes in Android 1.6" (take over the wall)

Learning Address: http://androidappdocs.appspot.com/guide/tutorials/views/hello-mapview.html

HelloItemizedOverlay.java Code

  package com.example.test; import java.util.ArrayList; import android.graphics.drawable.Drawable; import com.google.android.maps.ItemizedOverlay; import com.google.android.maps.OverlayItem; public class HelloItemizedOverlay extends ItemizedOverlay (private ArrayList <OverlayItem> mOverlays = new ArrayList <OverlayItem> (); public HelloItemizedOverlay (Drawable defaultMarker) (super (boundCenterBottom (defaultMarker ));// TODO Auto-generated constructor stub) @ Overridepublic int size () (return mOverlays. size ();) public void addOverlay (OverlayItem overlay) (mOverlays.add (overlay); populate ();}Overrideprotected OverlayItem createItem (int i) (return mOverlays.get (i);)) 

HelloMapView1.java Code

  package com.example.test; import java.util.List; import android.graphics.drawable.Drawable; import android.os.Bundle; import android.widget.LinearLayout; import android.widget.ZoomControls; import com.google.android . maps.GeoPoint; import com.google.android.maps.MapActivity; import com.google.android.maps.MapView; import com.google.android.maps.Overlay; import com.google.android.maps.OverlayItem; public class HelloMapView1 extends MapActivity (LinearLayout linearLayout; MapView mapView; ZoomControls mZoom; List <Overlay> mapOverlays; Drawable drawable; HelloItemizedOverlay itemizedOverlay; / ** Called when the activity is first created. * / @ Override public void onCreate (Bundle savedInstanceState) (super . onCreate (savedInstanceState); setContentView (R.layout.main); mapView = (MapView) findViewById (R.id.mapview); mapView.setBuiltInZoomControls (true); mapOverlays = mapView.getOverlays (); drawable = this.getResources ( ). getDrawable (R.drawable.androidmarker); itemizedOverlay = new HelloItemizedOverlay (drawable); GeoPoint point = new GeoPoint (19240000, -99120000); OverlayItem overlayitem = new OverlayItem (point, "", ""); itemizedOverlay.addOverlay ( overlayitem); mapOverlays.add (itemizedOverlay);) @ Override protected boolean isRouteDisplayed () (return false;)) 

Layout-> mail.xml

  <? xml version = "1.0" encoding = "utf-8"?> <RelativeLayout xmlns: android = "http://schemas.android.com/apk/res/android" android: id = "@ + id / mainlayout "android: orientation =" vertical "android: layout_width =" fill_parent "android: layout_height =" fill_parent "> <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 Maps API Key "/> <LinearLayout android: id =" @ + id / zoomview "android: layout_width =" wrap_content "android: layout_height = "wrap_content" android: layout_alignBottom = "@ id / mapview" android: layout_centerHorizontal = "true "/></ RelativeLayout> 

Implementation of the android Application, found that google maps can not be displayed, please know the cause of the friend told my, thank you.

Android if they had to switch on the screen solution

The time in the development of the game, some games are only horizontal screen play, so when placed in the erection of mobile phone, to keep the game screen is still horizontal screen. To achieve this requirement is very simple to configure in the AndroidManifest.xml inside look on it. Add this line android: screenOrientation = "landscape".

For example, (landscape is a horizontal, portrait vertical):
Java code

<? xml version = "1.0" encoding = "utf-8"?>
<manifest xmlns: android = "http://schemas.android.com/apk/res/android"
package = "com.ray.linkit"
android: versionCode = "1"
android: versionName = "1.0">
<application android:icon="@drawable/icon" android:label="@string/app_name">
<activity android: name = ". Main"
android: label = "@ string / app_name"
android: screenOrientation = "portrait">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</ intent-filter>
</ activity>
<activity android: name = ". GamePlay"
android: screenOrientation = "portrait"> </ activity>
<activity android: name = ". OptionView"
android: screenOrientation = "portrait"> </ activity>
</ application>
<uses-sdk android:minSdkVersion="3" />
</ manifest>

<? xml version = "1.0" encoding = "utf-8"?>
<manifest xmlns: android = "http://schemas.android.com/apk/res/android"
package = "com.ray.linkit"
android: versionCode = "1"
android: versionName = "1.0">
<application android:icon="@drawable/icon" android:label="@string/app_name">
<activity android: name = ". Main"
android: label = "@ string / app_name"
android: screenOrientation = "portrait">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</ intent-filter>
</ activity>
<activity android: name = ". GamePlay"
android: screenOrientation = "portrait"> </ activity>
<activity android: name = ". OptionView"
android: screenOrientation = "portrait"> </ activity>
</ application>
<uses-sdk android:minSdkVersion="3" />
</ manifest>

In addition, android dynamic switching each time the screen will restart Activity, so it should be in the Activity prior to their destruction to save the state of current activity in the Activity, when re-Create load configuration, as carried out in the game will not be automatically restarted!

Reprinted from: http://rayleung.javaeye.com/blog/426972

Answers Time :2009-01-18 18:04
When the screen when the screen becomes horizontal, the system will re-calls the current Activity's OnCreate method, you can put on your OnCreate the following methods to check the current in the direction of, then you can let your SetContentView to load a different Layout xml.

if (this.getResources (). getConfiguration (). orientation == Configuration.ORIENTATION_LANDSCAPE) (

Log.i ( "info", "landscape");

)

else if (this.getResources (). getConfiguration (). orientation == Configuration.ORIENTATION_PORTRAIT) (

Log.i ( "info", "portrait");

)

When switching on the screen first need to add the configuration in the androidmanifest.xml
android: configChanges = "orientation | keyboardHidden | navigation
So in the program. Activity will not be repeated call onCreate ()
Does not even call onPause.onResume.
Will call a onConfigurationChanged (Configuration newConfig)
This is the XML configuration option to join the premise.

If you join the options on the premise. As stated above. Activity will be re-activated onCreate method

According to your own needs to choose the configuration changes when the mechanism for handling such a better life.