Novice Tutorials :: Provider class

andrbeg — Wed, 18 Jun 2008 06:26:30 GMT

Author: andrbeg
Subject: Provider class
Posted: Wed Jun 18, 2008 7:26 am (GMT 1)

Could there be a tutorial on using android.provider.MediaStore.Audio and how to add data to its fields?
There's no documentation for it

Novice Tutorials :: Creating a ContextMenu on a ListView

plusminus — Sun, 15 Jun 2008 14:18:00 GMT

Author: plusminus
Subject: Creating a ContextMenu on a ListView
Posted: Sun Jun 15, 2008 3:18 pm (GMT 1)

Creating a ContextMenu on a ListView

What you learn: You will learn how to create a ContextMenu on a ListView. This can easily be applied to other situations.
Difficulty: 2 of 5

Questions/Problems: Simply post below...

What it will look like:

Description:
The Context-Menu gets visible when long-pressing an entry in the ListView.
Layout: "/res/main.xml"

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">

     <TextView 

          android:layout_width="fill_parent"

          android:layout_height="wrap_content"

          android:text="Long-Press on of the Items in the list." />

     <ListView android:id="@+id/list_favorites"

          android:layout_width="fill_parent"

          android:layout_height="fill_parent"/>

</LinearLayout>

We will create a ListView that gets filled by a list of a custom Class (Favorite). In the ContextMenu we will offer the user a possibility to delete the entry he long-pressed.

Java:

package org.anddev.contextmenusample;

import java.util.ArrayList;

import android.app.Activity;

import android.os.Bundle;

import android.view.ContextMenu;

import android.view.View;

import android.view.Menu.Item;

import android.view.View.OnPopulateContextMenuListener;

import android.widget.ArrayAdapter;

import android.widget.ListView;

import android.widget.AdapterView.ContextMenuInfo;

public class ContextMenuSample extends Activity {

     // ===========================================================

     // Final Fields

     // ===========================================================

     protected static final int CONTEXTMENU_DELETEITEM = 0;

     // ===========================================================

     // Fields

     // ===========================================================

     protected ListView mFavList;

     protected ArrayList<Favorite> fakeFavs = new ArrayList<Favorite>();

     // ===========================================================

     // "Constructors"

     // ===========================================================

     /** Called when the activity is first created. */

     @Override

     public void onCreate(Bundle icicle) {

          super.onCreate(icicle);

          setContentView(R.layout.main);

          /* Add some items to the list the listview will be showing. */

          fakeFavs.add(new Favorite("John", "nice guy"));

          fakeFavs.add(new Favorite("Yasmin", "hot girl"));

          fakeFavs.add(new Favorite("Jack", "cool guy"));

          this.mFavList = (ListView) this.findViewById(R.id.list_favorites);

          initListView();

     }

     private void refreshFavListItems() {

          mFavList.setAdapter(new ArrayAdapter<Favorite>(this, 

                    android.R.layout.simple_list_item_1, fakeFavs));

     }

     private void initListView() {

          /* Loads the items to the ListView. */

          refreshFavListItems();

          /* Add Context-Menu listener to the ListView. */

          mFavList.setOnPopulateContextMenuListener(new OnPopulateContextMenuListener() {

               @Override

               public void onPopulateContextMenu(ContextMenu conMenu, View arg1, Object arg2) {

                    conMenu.setHeader("ContextMenu");

                    conMenu.add(0, CONTEXTMENU_DELETEITEM, "Delete this favorite!");

                    /* Add as many context-menu-options as you want to. */

               }

          });

     }

     // ===========================================================

     // Methods from SuperClass/Interfaces

     // ===========================================================

     @Override

     public boolean onContextItemSelected(Item aItem) {

          ContextMenuInfo menuInfo = (ContextMenuInfo) aItem.getMenuInfo();

          /* Switch on the ID of the item, to get what the user selected. */

          switch (aItem.getId()) {

               case CONTEXTMENU_DELETEITEM:

                    /* Get the selected item out of the Adapter by its position. */

                    Favorite favContexted = (Favorite) mFavList.getAdapter()

                         .getItem(menuInfo.position);

                    /* Remove it from the list.*/

                    fakeFavs.remove(favContexted);

                    refreshFavListItems();

                    return true; /* true means: "we handled the event". */

          }

          return false;

     }

     // ===========================================================

     // Inner and Anonymous Classes

     // ===========================================================

     /** Small class holding some basic */

     protected class Favorite {

          protected String name;

          protected String kindness;

          protected Favorite(String name, String kindness) {

               this.name = name;

               this.kindness = kindness;

          }

          /** The ListView is going to display the toString() return-value! */

          public String toString() {

               return name + " (" + kindness + ")";

          }

          public boolean equals(Object o) {

               return o instanceof Favorite && ((Favorite) o).name.compareTo(name) == 0;

          }

     }

}

That's it

Regards,
plusminus
_________________

| Android Development Community / Tutorials

Novice Tutorials :: [VideoTUT]- Building an Android Application 101 - Google I/O

plusminus — Sat, 14 Jun 2008 08:43:09 GMT

Author: plusminus
Subject: [VideoTUT]- Building an Android Application 101 - Google I/O
Posted: Sat Jun 14, 2008 9:43 am (GMT 1)

[VideoTUT]- Building an Android Application 101 - Google I/O

This session is a practical introduction to building Android applications using the SDK and developer tools. We'll walk through building a non-trivial application and use it as the basis for discussing the various facets of the Android application framework.

Link

Regards,
plusminus
_________________

| Android Development Community / Tutorials

Novice Tutorials :: Tutorial for bundle,parcel

radhika — Mon, 09 Jun 2008 13:14:59 GMT

Author: radhika
Subject: Tutorial for bundle,parcel
Posted: Mon Jun 09, 2008 2:14 pm (GMT 1)

Hi PlusMinus,

Can you give a tutorial for the following:

1. How o create a bundle?
2. How to create a parcel? what are the parameters required to create it?
3. How to use the parcelable interface?
4. How to pass a bundle with a parcel to another activity and how to recover the data in the parcel in received activity?

Pleae help as am unable to do any of this.

Thanks in advance.
_________________
Thank you
Regards
radhika
Desire to learn