Query Contacts database, display in ListView.

The exercise "Query Contacts database" display result in TextView. It's modified to display in ListView.

Modify layout to have a ListView.

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity" 
    android:orientation="vertical">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/hello_world" />
    <ListView 
        android:id="@+id/conactlist"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>

</LinearLayout>

package com.example.androidquerycontacts;

import android.net.Uri;
import android.os.Bundle;
import android.provider.ContactsContract;
import android.support.v4.content.CursorLoader;
import android.support.v4.widget.CursorAdapter;
import android.support.v4.widget.SimpleCursorAdapter;
import android.app.Activity;
import android.database.Cursor;
import android.widget.ListAdapter;
import android.widget.ListView;

public class MainActivity extends Activity {
 
 ListView listContacts;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  
  listContacts = (ListView)findViewById(R.id.conactlist);
  
  Uri queryUri = ContactsContract.Contacts.CONTENT_URI;

  String[] projection = new String[] {
    ContactsContract.Contacts._ID,
    ContactsContract.Contacts.DISPLAY_NAME};
  
  String selection = ContactsContract.Contacts.DISPLAY_NAME + " IS NOT NULL";
  
  CursorLoader cursorLoader = new CursorLoader(
            this, 
            queryUri, 
            projection, 
            selection, 
            null, 
            null);
  
  Cursor cursor = cursorLoader.loadInBackground();
  
  String[] from = {ContactsContract.Contacts.DISPLAY_NAME};
        int[] to = {android.R.id.text1};
        
        ListAdapter adapter = new SimpleCursorAdapter(
                this, 
                android.R.layout.simple_list_item_1, 
                cursor, 
                from, 
                to, 
                CursorAdapter.FLAG_REGISTER_CONTENT_OBSERVER);
        listContacts.setAdapter(adapter);
 }

}

Download the files.

Compare with:
- List images in MediaStore.Images.Media

Next:
- Handle Item Click on Query Contacts database ListView

Query Contacts database, selection with AND to combine more cause.

The previous exercise demonstrate how to "Query Contacts database" for all contacts, "Search for contacts with phone number only" and "Search with selection of LIKE cause". To combine both cause to search for contacts has phone number with certain constraint in DISPLAY_NAME, combine both cause with "AND".

Change:
String selection = ContactsContract.Contacts.DISPLAY_NAME + " IS NOT NULL";

to:
String constraint = "Lau";
String selection =
ContactsContract.Contacts.HAS_PHONE_NUMBER + "=1"
+ " AND "
+ ContactsContract.Contacts.DISPLAY_NAME + " LIKE '%" + constraint + "%'";

Query Contacts database, search with selection of LIKE cause.

The previous exercise demonstrate how to "Query Contacts database" for all contacts. To search for contacts with certain constraint in DISPLAY_NAME, we can modify the selection using LIKE cause.

Change:
String selection = ContactsContract.Contacts.DISPLAY_NAME + " IS NOT NULL";

to:
String constraint = "Lau";
String selection = ContactsContract.Contacts.DISPLAY_NAME + " LIKE '%" + constraint + "%'";

Android Design in Action: Responsive Design

The special episode focus on tablets and responsive design. Look at the following apps and discuss how they respond to differing device form factors:
-- Android Calendar 3:47
-- Pattrn 8:18
-- Pocket 11:33
-- TED 14:54
-- Google I/O 2012 18:28

Query Contacts database for contacts with phone number only

Last exercise "Query Contacts database" for all contacts. If you want to query contacts with phone number only, simple change the selection:

Change:
String selection = ContactsContract.Contacts.DISPLAY_NAME + " IS NOT NULL";

to:
String selection = ContactsContract.Contacts.HAS_PHONE_NUMBER + "=1";

Query Contacts database

This exercise demonstrate how to query Contacts database directly, to retrieve _ID and DISPLAY_NAME.

package com.example.androidquerycontacts;

import android.net.Uri;
import android.os.Bundle;
import android.provider.ContactsContract;
import android.provider.ContactsContract.Contacts;
import android.support.v4.content.CursorLoader;
import android.app.Activity;
import android.database.Cursor;
import android.widget.TextView;

public class MainActivity extends Activity {
 
 TextView textContacts;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  textContacts = (TextView)findViewById(R.id.contacts);
  
  Uri queryUri = ContactsContract.Contacts.CONTENT_URI;
  String[] projection = new String[] {
    ContactsContract.Contacts._ID,
    ContactsContract.Contacts.DISPLAY_NAME};
  String selection = ContactsContract.Contacts.DISPLAY_NAME + " IS NOT NULL";
  
  CursorLoader cursorLoader = new CursorLoader(
            this, 
            queryUri, 
            projection, 
            selection, 
            null, 
            null);
  
  Cursor cursor = cursorLoader.loadInBackground();
  
  int columnIndex_ID = cursor.getColumnIndex(Contacts._ID);
  int columnIndex_DISPLAYNAME = cursor.getColumnIndex(Contacts.DISPLAY_NAME);
  
  String myContacts = "Contacts:\n";
  
  while(cursor.moveToNext()){
   int id = cursor.getInt(columnIndex_ID);
   String displayName = cursor.getString(columnIndex_DISPLAYNAME);
   myContacts += String.valueOf(id) + " : " + displayName +"\n";
  }
  
  textContacts.setText(myContacts);
 }


}

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity" 
    android:orientation="vertical">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/hello_world" />
    <ScrollView 
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >
        <TextView
        android:id="@+id/contacts"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />
    </ScrollView>
    

</LinearLayout>

Permission of "android.permission.READ_CONTACTS" is needed in AndroidManifest.xml.

Download the files.


Next:
- Query Contacts database for contacts with phone number only
- Query Contacts database, search with selection of LIKE cause
- Query Contacts database, selection with AND to combine more cause
- Query Contacts database, display in ListView
- Handle Item Click on Query Contacts database ListView
- Access ContactsContract.CommonDataKinds.Phone via LOOKUP_KEY
- Get Email from Contacts database

Get phone number from Contacts database

In the exercise, start a activity with intent of Intent.ACTION_PICK. Retrieve the phone number from the selected contact using SQLite query.

package com.example.androidreadcontact;

import android.net.Uri;
import android.os.Bundle;
import android.provider.ContactsContract;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
import android.app.Activity;
import android.content.Intent;
import android.database.Cursor;

public class MainActivity extends Activity {
 
 Button buttonReadContact;
 TextView textPhone;
 
 final int RQS_PICKCONTACT = 1;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  buttonReadContact = (Button)findViewById(R.id.readcontact);
  textPhone = (TextView)findViewById(R.id.phone);
  
  buttonReadContact.setOnClickListener(new OnClickListener(){

   @Override
   public void onClick(View arg0) {
    //Start activity to get contact
    final Uri uriContact = ContactsContract.Contacts.CONTENT_URI;
    Intent intentPickContact = new Intent(Intent.ACTION_PICK, uriContact);
    startActivityForResult(intentPickContact, RQS_PICKCONTACT);
   }});

 }

 @Override
 protected void onActivityResult(int requestCode, int resultCode, Intent data) {
  // TODO Auto-generated method stub
  if(resultCode == RESULT_OK){
   if(requestCode == RQS_PICKCONTACT){
    Uri returnUri = data.getData();
    Cursor cursor = getContentResolver().query(returnUri, null, null, null, null);
    
    if(cursor.moveToNext()){
     int columnIndex_ID = cursor.getColumnIndex(ContactsContract.Contacts._ID);
     String contactID = cursor.getString(columnIndex_ID);
     
     int columnIndex_HASPHONENUMBER = cursor.getColumnIndex(ContactsContract.Contacts.HAS_PHONE_NUMBER);
     String stringHasPhoneNumber = cursor.getString(columnIndex_HASPHONENUMBER);
     
     if(stringHasPhoneNumber.equalsIgnoreCase("1")){
      Cursor cursorNum = getContentResolver().query(
        ContactsContract.CommonDataKinds.Phone.CONTENT_URI, 
        null, 
        ContactsContract.CommonDataKinds.Phone.CONTACT_ID + "=" + contactID, 
        null, 
        null);
      
      //Get the first phone number
      if(cursorNum.moveToNext()){
       int columnIndex_number = cursorNum.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER);
       String stringNumber = cursorNum.getString(columnIndex_number);
       textPhone.setText(stringNumber);
      }
      
     }else{
      textPhone.setText("NO Phone Number");
     }
     
     
    }else{
     Toast.makeText(getApplicationContext(), "NO data!", Toast.LENGTH_LONG).show();
    }
   }
  }
 }
 
 

}

Layout:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity" 
    android:orientation="vertical">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/hello_world" />

    <Button
        android:id="@+id/readcontact"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" 
        android:text="Read Contact"/>
    <TextView
        android:id="@+id/phone"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

</LinearLayout>

Permission of "android.permission.READ_CONTACTS" is needed in AndroidManifest.xml.

Download the files.

Pro Android Games, Second Edition

In the last few years, Android has progressed with the debut of better fonts, new User Interface and Experience (UI/UX) APIs, tablet considerations, multi-touch capabilities, multi-tasking, faster performance, improved battery management techniques, and now Google TV Android Apps for the Android game app developer repertoire.

With actionable real-world source, Pro Android Games, Second Edition shows you how to build more sophisticated and addictive Android games, by leveraging the power of these recent advancements found in the new Android Jelly Beans development platform as well as those you've counted on in earlier releases. Multi-touch code gives these games and their players dynamic input and exchange ability, for a more realistic arcade game experience. Faster and better performance offers game players a more seamless, fun arcade experience like never before on Android. There is also improved native C/C++ integration with Android's NDK as well, which makes coding, compiling, and converting both productive and efficient with gains in app performance.

*** NOTE:  This book published previously as Advanced Android 4 Games.  This edition covers game development for all Android SDK versions up to Jelly Bean / Android SDK 4.1.

Pro Android Games, Second Edition features the following improvements: 

• Updates to the latest version of the Android SDK, NKD, plus the latest Eclipse IDE.
• Greater focus on tablets the ever changing device resolutions, and hardware specs. 
• Native game development and hardware accelerated graphics.
• Bigger and Better Real World Engines, such as Quake I and II Plus an oldie from the previous edition: Doom
• Coverage of the new smart TV APIs (Google TV), UI, UX, multi-touch and multi-tasking features available with Android Jelly Bean.
• A look into the future with augmented reality
• Advanced techniques for improving your game playing experience including better multi-tasking, improved performance optimization, battery management and more.
• A "Quake 3D"-like game app case study 

You’ll definitely have fun, and perhaps you’ll even make some money. Enjoy!

What you’ll learn

• Key advanced Android gaming techniques using the new Android SDK and NDK
• How to add and integrate multi-touch
• How to use Bluetooth controllers (Zeemote)
• More gaming tricks and tips, such as hybrid 3D graphics with OpenGL and JNI
• How to port, augment a 3D shooter "Doom"-like game app using OpenGL
• How to build a 3D shooter game like "Quake" and "Quake II"
• How and where to best deploy these game apps

Who this book is for

This book is for savvy Android app developers who are looking for professional or advanced techniques for porting, augmenting and building 3D game apps that are complex, fun and lucrative.

Table of Contents

1. Welcome to Android Gaming
2. Gaming Tricks for Phones or Tablets
3. More Gaming Tricks with OpenGL and JNI 
4. Efficient Graphics and Portability with OpenGL ES 2.0 
5. 3D Shooters for Doom
6. 3D Shooters for Quake  
7. 3D Shooters for Quake II
8. Fun With Bluetooth Controllers
9. A Look Into the Future: Augmented Reality and Google TV
10. Deployment and Compilation Tips

Free ebook: Introducing Windows 8: An Overview for IT Professionals (Final Edition) - from Microsoft

Microsoft Press have released the final version of the ebook Introducing Windows 8: An Overview for IT Professionals, for FREE!

Link: Download PDF

Get a headstart evaluating Window 8—guided by a Windows expert who’s worked extensively with the software since the preview releases. Based on final, release-to-manufacturing (RTM) software, this book introduces new features and capabilities, with scenario-based insights demonstrating how to plan for, implement, and maintain Windows 8 in an enterprise environment. Get the high-level information you need to begin preparing your deployment now.

Topics include:

• Performance, reliability, and security features

• Deployment options

• Windows Assessment and Deployment Kit

• Windows PowerShell™ 3.0 and Group Policy

• Managing and sideloading apps

• Internet Explorer® 10

• Virtualization, Client Hyper-V, and Microsoft Desktop Optimization Pack

• Recovery features

Source: http://blogs.msdn.com/b/microsoft_press/archive/2012/11/13/free-ebook-introducing-windows-8-an-overview-for-it-professionals-final-edition.aspx

Android 4.2 SDK is available

Android 4.2 (Jelly Bean) SDK platform with API level 17 is available now. get started developing and testing, download the Android 4.2 Platform from the Android SDK Manager.

For a complete overview of what's new, take a look at the Android 4.2 platform highlights or read more of the details in the API overview.

Source: Android Developers Blog - Introducing Android 4.2, A New and Improved Jelly Bean.

Implement custom multi select ListView with custom ArrayAdapter

The post "Multi Choice ListView" demonstrate how to implement multi select ListView with build-in layout with simple TextView. This exercise demonstrate how to implement multi select ListView with custom layout, using custom ArrayAdapter.

Create /res/layout/row.xml to define the layout of rows in our custom 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">
    
    <ImageView 
        android:layout_width="50dp"
        android:layout_height="50dp"
        android:src="@drawable/ic_launcher"/>
    <CheckedTextView
        android:id="@+id/text1"
        android:layout_width="match_parent"
        android:layout_height="?android:attr/listPreferredItemHeightSmall"
        android:textAppearance="?android:attr/textAppearanceListItemSmall"
        android:gravity="center_vertical"
        android:checkMark="?android:attr/listChoiceIndicatorMultiple"
        android:paddingLeft="?android:attr/listPreferredItemPaddingLeft"
        android:paddingRight="?android:attr/listPreferredItemPaddingRight"/>
</LinearLayout>

Layout of our example.

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <Button
        android:id="@+id/getresult"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Get Result"/>
    <ListView
        android:id="@+id/list"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

</LinearLayout>

Main Java code.

package com.example.androidmultichoicelist;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import android.os.Bundle;
import android.app.Activity;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.CheckedTextView;
import android.widget.ListView;
import android.widget.Toast;

public class MainActivity extends Activity {
 
 ListView myListView;
 Button getResult;
 
 private ArrayList<String> dayOfWeekList = new ArrayList<String>();

 private void initDayOfWeekList(){
  dayOfWeekList.add("Sunday");
  dayOfWeekList.add("Monday");
  dayOfWeekList.add("Tuesday");
  dayOfWeekList.add("Wednesday");
  dayOfWeekList.add("Thursday");
  dayOfWeekList.add("Friday");
  dayOfWeekList.add("Saturday");
  
 }
 
 MyArrayAdapter myArrayAdapter;
 
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        initDayOfWeekList();
        setContentView(R.layout.activity_main);
        
        myListView = (ListView)findViewById(R.id.list);

        myArrayAdapter = new MyArrayAdapter(
          this,
          R.layout.row,
          android.R.id.text1,
          dayOfWeekList
          );
        
        myListView.setAdapter(myArrayAdapter);
        myListView.setOnItemClickListener(myOnItemClickListener);
        
        getResult = (Button)findViewById(R.id.getresult);
        getResult.setOnClickListener(new OnClickListener(){

   @Override
   public void onClick(View v) {
    String result = "";
    
    /*
    //getCheckedItemPositions
    List<Integer> resultList = myArrayAdapter.getCheckedItemPositions();
    for(int i = 0; i < resultList.size(); i++){
     result += String.valueOf(resultList.get(i)) + " ";
    }
    */
    
    //getCheckedItems
    List<String> resultList = myArrayAdapter.getCheckedItems();
    for(int i = 0; i < resultList.size(); i++){
     result += String.valueOf(resultList.get(i)) + "\n";
    }
    
    myArrayAdapter.getCheckedItemPositions().toString();
    Toast.makeText(
      getApplicationContext(), 
      result, 
      Toast.LENGTH_LONG).show();
   }});
        
    }
    
    OnItemClickListener myOnItemClickListener
    = new OnItemClickListener(){

  @Override
  public void onItemClick(AdapterView<?> parent, View view, int position,
    long id) {
   myArrayAdapter.toggleChecked(position);
   
  }};
    
    private class MyArrayAdapter extends ArrayAdapter<String>{
     
     private HashMap<Integer, Boolean> myChecked = new HashMap<Integer, Boolean>();

  public MyArrayAdapter(Context context, int resource,
    int textViewResourceId, List<String> objects) {
   super(context, resource, textViewResourceId, objects);
   
   for(int i = 0; i < objects.size(); i++){
    myChecked.put(i, false);
   }
  }
     
  public void toggleChecked(int position){
   if(myChecked.get(position)){
    myChecked.put(position, false);
   }else{
    myChecked.put(position, true);
   }
   
   notifyDataSetChanged();
  }
  
  public List<Integer> getCheckedItemPositions(){
   List<Integer> checkedItemPositions = new ArrayList<Integer>();
   
   for(int i = 0; i < myChecked.size(); i++){
    if (myChecked.get(i)){
     (checkedItemPositions).add(i);
    }
   }
   
   return checkedItemPositions;
  }
  
  public List<String> getCheckedItems(){
   List<String> checkedItems = new ArrayList<String>();
   
   for(int i = 0; i < myChecked.size(); i++){
    if (myChecked.get(i)){
     (checkedItems).add(dayOfWeekList.get(i));
    }
   }
   
   return checkedItems;
  }

  @Override
  public View getView(int position, View convertView, ViewGroup parent) {
   View row = convertView;
   
   if(row==null){
    LayoutInflater inflater=getLayoutInflater();
    row=inflater.inflate(R.layout.row, parent, false);  
   }
   
   CheckedTextView checkedTextView = (CheckedTextView)row.findViewById(R.id.text1);
   checkedTextView.setText(dayOfWeekList.get(position));
   
   Boolean checked = myChecked.get(position);
   if (checked != null) {
    checkedTextView.setChecked(checked);
            }
   
   return row;
  }
  
    }

}

Download the files.

List MediaStore.Images.Thumbnails in GridView, with custom SimpleCursorAdapter.

Last exercise list MediaStore.Images.Thumbnails in ListView, with custom SimpleCursorAdapter. It's easy to be modified to display in GridView.

Modify /res/layout/row.xml to have a ImageView only in each grid.

<?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">
    
    <ImageView
        android:id="@+id/thumb"
        android:layout_width="100dp"
        android:layout_height="100dp"/>

</LinearLayout>

Modify layout to have a GridView.

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent" 
    android:orientation="vertical">

    <GridView
        android:id="@+id/gridview"
        android:layout_width="fill_parent" 
        android:layout_height="fill_parent"
        android:columnWidth="100dp"
        android:numColumns="auto_fit"
        android:verticalSpacing="10dp"
        android:horizontalSpacing="10dp"
        android:stretchMode="columnWidth"
        android:gravity="center"/>

</LinearLayout>

Modify the code extends Activity with GridView, instead of ListActivity.

package com.example.androidlistimages;

import android.net.Uri;
import android.os.Bundle;
import android.provider.MediaStore;
import android.support.v4.content.CursorLoader;
import android.support.v4.widget.CursorAdapter;
import android.support.v4.widget.SimpleCursorAdapter;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.GridView;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.Toast;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;

public class MainActivity extends Activity {
 
 //define source of MediaStore.Images.Media, internal or external storage
 final Uri sourceUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
 final Uri thumbUri = MediaStore.Images.Thumbnails.EXTERNAL_CONTENT_URI;
 final String thumb_DATA = MediaStore.Images.Thumbnails.DATA;
 final String thumb_IMAGE_ID = MediaStore.Images.Thumbnails.IMAGE_ID;

 //SimpleCursorAdapter mySimpleCursorAdapter;
 MyAdapter mySimpleCursorAdapter;
 
 GridView myGridView;
 
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        myGridView = (GridView)findViewById(R.id.gridview);
        
        String[] from = {MediaStore.MediaColumns.TITLE};
        int[] to = {android.R.id.text1};

        CursorLoader cursorLoader = new CursorLoader(
          this, 
          sourceUri, 
          null, 
          null, 
          null, 
          MediaStore.Audio.Media.TITLE);
        
        Cursor cursor = cursorLoader.loadInBackground();
        
        mySimpleCursorAdapter = new MyAdapter(
          this, 
          android.R.layout.simple_list_item_1, 
          cursor, 
          from, 
          to, 
          CursorAdapter.FLAG_REGISTER_CONTENT_OBSERVER);
        
        myGridView.setAdapter(mySimpleCursorAdapter);
        myGridView.setOnItemClickListener(myOnItemClickListener);
    }
    
    OnItemClickListener myOnItemClickListener
    = new OnItemClickListener(){

  @Override
  public void onItemClick(AdapterView<?> parent, View view, int position,
    long id) {
   Cursor cursor = mySimpleCursorAdapter.getCursor();
   cursor.moveToPosition(position);

   int int_ID = cursor.getInt(cursor.getColumnIndex(MediaStore.Images.Media._ID));
   getThumbnail(int_ID);
  }};
 
 private Bitmap getThumbnail(int id){

  String[] thumbColumns = {thumb_DATA, thumb_IMAGE_ID};

  CursorLoader thumbCursorLoader = new CursorLoader(
          this, 
          thumbUri, 
    thumbColumns, 
    thumb_IMAGE_ID + "=" + id, 
    null, 
    null);
        
        Cursor thumbCursor = thumbCursorLoader.loadInBackground();
        
        Bitmap thumbBitmap = null;
        if(thumbCursor.moveToFirst()){
   int thCulumnIndex = thumbCursor.getColumnIndex(thumb_DATA);
   
   String thumbPath = thumbCursor.getString(thCulumnIndex);
   
   Toast.makeText(getApplicationContext(), 
     thumbPath, 
     Toast.LENGTH_LONG).show();
   
   thumbBitmap = BitmapFactory.decodeFile(thumbPath);
   
   //Create a Dialog to display the thumbnail
   AlertDialog.Builder thumbDialog = new AlertDialog.Builder(MainActivity.this);
   ImageView thumbView = new ImageView(MainActivity.this);
   thumbView.setImageBitmap(thumbBitmap);
   LinearLayout layout = new LinearLayout(MainActivity.this);
         layout.setOrientation(LinearLayout.VERTICAL);
         layout.addView(thumbView);
         thumbDialog.setView(layout);
         thumbDialog.show();
   
  }else{
   Toast.makeText(getApplicationContext(), 
     "NO Thumbnail!", 
     Toast.LENGTH_LONG).show();
  }
        
        return thumbBitmap;
 }
 
 public class MyAdapter extends SimpleCursorAdapter{
  
  Cursor myCursor;
     Context myContext;

  public MyAdapter(Context context, int layout, Cursor c, String[] from,
    int[] to, int flags) {
   super(context, layout, c, from, to, flags);
   
   myCursor = c;
      myContext = context;
  }

  @Override
  public View getView(int position, View convertView, ViewGroup parent) {
   View row = convertView;
   if(row==null){
    LayoutInflater inflater=getLayoutInflater();
    row=inflater.inflate(R.layout.row, parent, false); 
   }
   
   ImageView thumbV = (ImageView)row.findViewById(R.id.thumb);
   
   myCursor.moveToPosition(position);
   
   int myID = myCursor.getInt(myCursor.getColumnIndex(MediaStore.Images.Media._ID));
   
   String[] thumbColumns = {thumb_DATA, thumb_IMAGE_ID};
   CursorLoader thumbCursorLoader = new CursorLoader(
     myContext, 
           thumbUri, 
     thumbColumns, 
     thumb_IMAGE_ID + "=" + myID, 
     null, 
     null);
   Cursor thumbCursor = thumbCursorLoader.loadInBackground();
   
   Bitmap myBitmap = null;
         if(thumbCursor.moveToFirst()){
    int thCulumnIndex = thumbCursor.getColumnIndex(thumb_DATA);
    String thumbPath = thumbCursor.getString(thCulumnIndex);
    myBitmap = BitmapFactory.decodeFile(thumbPath);
    thumbV.setImageBitmap(myBitmap);
   }
   
   return row;
  }
  
 }
}

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