Implement slide-in and slide-out animation

package com.exercise.AndroidAnimation;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.Animation.AnimationListener;
import android.view.animation.AnimationUtils;
import android.widget.ImageView;

public class AndroidAnimationActivity extends Activity {
 
 ImageView image1, image2, image3;
 Animation animationSlideInLeft, animationSlideOutRight;
 ImageView curSlidingImage;
 
   /** Called when the activity is first created. */
   @Override
   public void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.main);
       image1 = (ImageView)findViewById(R.id.image1);
       image2 = (ImageView)findViewById(R.id.image2);
       image3 = (ImageView)findViewById(R.id.image3);
      
       animationSlideInLeft = AnimationUtils.loadAnimation(this,
         android.R.anim.slide_in_left);
       animationSlideOutRight = AnimationUtils.loadAnimation(this,
         android.R.anim.slide_out_right);
       animationSlideInLeft.setDuration(1000);
       animationSlideOutRight.setDuration(1000);
       animationSlideInLeft.setAnimationListener(animationSlideInLeftListener);
       animationSlideOutRight.setAnimationListener(animationSlideOutRightListener);

       curSlidingImage = image1;
       image1.startAnimation(animationSlideInLeft);
       image1.setVisibility(View.VISIBLE);

   }

 @Override
 protected void onPause() {
  // TODO Auto-generated method stub
  super.onPause();
  image1.clearAnimation();
  image2.clearAnimation();
  image3.clearAnimation();
 }
  
 AnimationListener animationSlideInLeftListener
 = new AnimationListener(){

  @Override
  public void onAnimationEnd(Animation animation) {
   // TODO Auto-generated method stub
   
   if(curSlidingImage == image1){
    image1.startAnimation(animationSlideOutRight);
   }else if(curSlidingImage == image2){
    image2.startAnimation(animationSlideOutRight);
   }else if(curSlidingImage == image3){
    image3.startAnimation(animationSlideOutRight);
   } 
  }

  @Override
  public void onAnimationRepeat(Animation animation) {
   // TODO Auto-generated method stub
   
  }

  @Override
  public void onAnimationStart(Animation animation) {
   // TODO Auto-generated method stub
   
  }};
   
 AnimationListener animationSlideOutRightListener
 = new AnimationListener(){
   @Override
  public void onAnimationEnd(Animation animation) {
   // TODO Auto-generated method stub
    if(curSlidingImage == image1){
     curSlidingImage = image2;
     image2.startAnimation(animationSlideInLeft);
     image1.setVisibility(View.INVISIBLE);
     image2.setVisibility(View.VISIBLE);
     image3.setVisibility(View.INVISIBLE);
    }else if(curSlidingImage == image2){
     curSlidingImage = image3;
     image3.startAnimation(animationSlideInLeft);
     image1.setVisibility(View.INVISIBLE);
     image2.setVisibility(View.INVISIBLE);
     image3.setVisibility(View.VISIBLE);
    }else if(curSlidingImage == image3){
     curSlidingImage = image1;
     image1.startAnimation(animationSlideInLeft);
     image1.setVisibility(View.VISIBLE);
     image2.setVisibility(View.INVISIBLE);
     image3.setVisibility(View.INVISIBLE);
    }
  }

  @Override
  public void onAnimationRepeat(Animation animation) {
   // TODO Auto-generated method stub
   
  }
  @Override
  public void onAnimationStart(Animation animation) {
   // TODO Auto-generated method stub
    
  }};
}

<?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"
   />
<ImageView
   android:id="@+id/image1"
   android:layout_width="fill_parent"
   android:layout_height="wrap_content"
   android:src="@drawable/icon"
   android:visibility="invisible"
   />
<ImageView
   android:id="@+id/image2"
   android:layout_width="fill_parent"
   android:layout_height="wrap_content"
   android:src="@drawable/icon"
   android:visibility="invisible"
   />
<ImageView
   android:id="@+id/image3"
   android:layout_width="fill_parent"
   android:layout_height="wrap_content"
   android:src="@drawable/icon"
   android:visibility="invisible"
   />
</LinearLayout>

Download the files.



Ref:
- Implement simple Fade-in Animation
- Handle Animation event, AnimationListener
- Android pre-defined Animation Resources
- Implement slide top-down vertical animation
- Animation of sliding horizontal and vertical

Android pre-defined Animation Resources

In the last exercise "Implement simple Fade-in Animation" and "Handle Animation event, AnimationListener", we create our own animation (fadein.xml and fadeout.xml). Actually, Android come with some pre-defined Animation Resources include android.R.anim.fade_in and android.R.anim.fade_in. Such that we can omit the creation of /res/anim/fadein.xml and /res/anim/fadeout.xml.

This exercise have the almost same effect as in the last exercise "Handle Animation event, AnimationListener".

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"
  >
<TextView
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  android:text="@string/hello"
  />
<ImageView
  android:id="@+id/image"
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  android:src="@drawable/icon"
  />
</LinearLayout>

package com.exercise.AndroidAnimation;

import android.app.Activity;
import android.os.Bundle;
import android.view.animation.Animation;
import android.view.animation.Animation.AnimationListener;
import android.view.animation.AnimationUtils;
import android.widget.ImageView;

public class AndroidAnimationActivity extends Activity {

ImageView image;
Animation animationFadeIn, animationFadeOut;

  /** Called when the activity is first created. */
  @Override
  public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.main);
      image = (ImageView)findViewById(R.id.image);
    
      animationFadeIn = AnimationUtils.loadAnimation(this,
        android.R.anim.fade_in);
      animationFadeOut = AnimationUtils.loadAnimation(this,
        android.R.anim.fade_out);
      animationFadeIn.setAnimationListener(animationInListener);
      animationFadeOut.setAnimationListener(animationOutListener);
      image.startAnimation(animationFadeIn);
  }

@Override
protected void onPause() {
 // TODO Auto-generated method stub
 super.onPause();
 image.clearAnimation();
}

AnimationListener animationInListener
= new AnimationListener(){

 @Override
 public void onAnimationEnd(Animation animation) {
  // TODO Auto-generated method stub
  image.startAnimation(animationFadeOut);
 }

 @Override
 public void onAnimationRepeat(Animation animation) {
  // TODO Auto-generated method stub
 
 }

 @Override
 public void onAnimationStart(Animation animation) {
  // TODO Auto-generated method stub
 
 }};

AnimationListener animationOutListener
= new AnimationListener(){

 @Override
 public void onAnimationEnd(Animation animation) {
  // TODO Auto-generated method stub
  image.startAnimation(animationFadeIn);
 }

 @Override
 public void onAnimationRepeat(Animation animation) {
  // TODO Auto-generated method stub
 
 }

 @Override
 public void onAnimationStart(Animation animation) {
  // TODO Auto-generated method stub
 
 }};
}

Download the files.

next:
- Implement slide-in and slide-out animation

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If you have been developing Qt applications for Symbian^3, Symbian Anna, or Symbian Belle and are interested in building your applications for Windows Phone, this guide is for you.

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Handle Animation event, AnimationListener.

Create animation XML files.
/res/anim/fadein.xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
 android:shareInterpolator="false">
 <alpha android:fromAlpha="0.0"
   android:toAlpha="1.0"
   android:duration="1000">
 </alpha>
</set>

/res/anim/fadeout.xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
 android:shareInterpolator="false">
 <alpha android:fromAlpha="1.0"
   android:toAlpha="0.0"
   android:duration="1000">
 </alpha>
</set>

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"
    >
<TextView  
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="@string/hello"
    />
<ImageView 
    android:id="@+id/image" 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:src="@drawable/icon"
    />
</LinearLayout>

package com.exercise.AndroidAnimation;

import android.app.Activity;
import android.os.Bundle;
import android.view.animation.Animation;
import android.view.animation.Animation.AnimationListener;
import android.view.animation.AnimationUtils;
import android.widget.ImageView;

public class AndroidAnimationActivity extends Activity {
 
 ImageView image;
 Animation animationFadeIn, animationFadeOut;
 
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        image = (ImageView)findViewById(R.id.image);
        
        animationFadeIn = AnimationUtils.loadAnimation(this, R.anim.fadein);
        animationFadeOut = AnimationUtils.loadAnimation(this, R.anim.fadeout);
        animationFadeIn.setAnimationListener(animationInListener);
        animationFadeOut.setAnimationListener(animationOutListener);
        image.startAnimation(animationFadeIn);
    }

 @Override
 protected void onPause() {
  // TODO Auto-generated method stub
  super.onPause();
  image.clearAnimation();
 }
 
 AnimationListener animationInListener
 = new AnimationListener(){

  @Override
  public void onAnimationEnd(Animation animation) {
   // TODO Auto-generated method stub
   image.startAnimation(animationFadeOut);
  }

  @Override
  public void onAnimationRepeat(Animation animation) {
   // TODO Auto-generated method stub
   
  }

  @Override
  public void onAnimationStart(Animation animation) {
   // TODO Auto-generated method stub
   
  }};
  
 AnimationListener animationOutListener
 = new AnimationListener(){

  @Override
  public void onAnimationEnd(Animation animation) {
   // TODO Auto-generated method stub
   image.startAnimation(animationFadeIn);
  }

  @Override
  public void onAnimationRepeat(Animation animation) {
   // TODO Auto-generated method stub
   
  }

  @Override
  public void onAnimationStart(Animation animation) {
   // TODO Auto-generated method stub
   
  }};
}

Download the files.


next:
- Android pre-defined Animation Resources

Implement simple Fade-in Animation

Create /res/anim/fadein.xml to define the fade-in animation

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
android:shareInterpolator="false">
<alpha android:fromAlpha="0.0"
  android:toAlpha="1.0"
  android:duration="5000">
</alpha>
</set>

main.xml layout

<?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"
   />
<ImageView
   android:id="@+id/image"
   android:layout_width="fill_parent"
   android:layout_height="fill_parent"
   android:scaleType="centerCrop"
   android:src="@drawable/icon"
   />
</LinearLayout>

package com.exercise.AndroidAnimation;

import android.app.Activity;
import android.os.Bundle;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.ImageView;

public class AndroidAnimationActivity extends Activity {

ImageView image;

   /** Called when the activity is first created. */
   @Override
   public void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.main);
       image = (ImageView)findViewById(R.id.image);
      
       Animation animationFadeIn = AnimationUtils.loadAnimation(this, R.anim.fadein);
       image.startAnimation(animationFadeIn);
   }

@Override
protected void onPause() {
 // TODO Auto-generated method stub
 super.onPause();
 image.clearAnimation();
}
}

Download the files.



next:
- Handle Animation event, AnimationListener.
- Android pre-defined Animation Resources

Nexus One updated Gingerbread 2.3.6 (CAUTION: Don't update!)

If you still have a Nexus One and can't wait OTA update, it's easy to Google "Nexus One 2.3.6" manual update :)

CAUTION!


After Updated 2.3.6 on my Nexus One, The Portable Wi-Fi hotspot cannot work!
- Everytime the Wi-Fi hotspot enabled, the data(3G) disconnected :(

Multi Choice ListView

package com.exercise.AndroidMultiChoiceList;

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

public class AndroidMultiChoiceListActivity extends Activity {
 
 ListView choiceList;
 String[] choice = { "Choice A", 
   "Choice B", "Choice C", "Choice D", "Choice E"};
 
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        choiceList = (ListView)findViewById(R.id.list);
        
        ArrayAdapter<String> adapter
        = new ArrayAdapter<String>(this, 
          android.R.layout.simple_list_item_multiple_choice, 
          choice);
        choiceList.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);
        choiceList.setAdapter(adapter);
 
    }
}

<?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"
    />
<ListView 
    android:id="@+id/list"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    />
</LinearLayout>

Related:
- Implement multi select ListView with custom layout, using custom ArrayAdapter.

Related ListFragment:
- ListFragment with multiple choice

Monitor the Proximity Sensor

Proximity sensor measures the distance that some object is from the device. It is often used to detect the presence of a person’s face next to the device.



Some proximity sensors only support a binary near or far measurement. In this case, the sensor should report its maximum range value in the far state and a lesser value in the near state.

package com.exercise.AndroidProximitySensor;

import android.app.Activity;
import android.content.Context;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.os.Bundle;
import android.widget.TextView;

public class AndroidProximitySensorActivity extends Activity {
    /** Called when the activity is first created. */
 
 TextView ProximitySensor, ProximityMax, ProximityReading;
 
 SensorManager mySensorManager;
 Sensor myProximitySensor;
 
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        ProximitySensor = (TextView)findViewById(R.id.proximitySensor);
        ProximityMax = (TextView)findViewById(R.id.proximityMax);
        ProximityReading = (TextView)findViewById(R.id.proximityReading);
        
        mySensorManager = (SensorManager)getSystemService(
          Context.SENSOR_SERVICE);
        myProximitySensor = mySensorManager.getDefaultSensor(
          Sensor.TYPE_PROXIMITY);
        
        if (myProximitySensor == null){
         ProximitySensor.setText("No Proximity Sensor!"); 
        }else{
         ProximitySensor.setText(myProximitySensor.getName());
         ProximityMax.setText("Maximum Range: "
           + String.valueOf(myProximitySensor.getMaximumRange()));
         mySensorManager.registerListener(proximitySensorEventListener,
           myProximitySensor,
           SensorManager.SENSOR_DELAY_NORMAL);
        }
    }
    
    SensorEventListener proximitySensorEventListener
    = new SensorEventListener(){

  @Override
  public void onAccuracyChanged(Sensor sensor, int accuracy) {
   // TODO Auto-generated method stub
   
  }

  @Override
  public void onSensorChanged(SensorEvent event) {
   // TODO Auto-generated method stub

   if(event.sensor.getType()==Sensor.TYPE_PROXIMITY){
    ProximityReading.setText("Proximity Sensor Reading:"
      + String.valueOf(event.values[0]));
   }
  }
    };
}

<?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:id="@+id/proximitySensor"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    />
<TextView  
    android:id="@+id/proximityMax"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    />
<TextView  
    android:id="@+id/proximityReading"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    />
</LinearLayout>

Download the files.

Query and Parse Google+ JSON

There is a post in The official Google Code blog, discuss about Getting started on the Google+ API. It's a exercise to query and parse Google+ JSON using Google+ API.






To use Google+ API, you have to Apply your own Google+ API key.

package com.exercise.AndroidGooglePlus;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;

import org.apache.http.HttpEntity;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONException;
import org.json.JSONObject;

import android.app.Activity;
import android.os.Bundle;
import android.text.Html;
import android.widget.TextView;
import android.widget.Toast;

public class AndroidGooglePlusActivity extends Activity {

  TextView item_kind;
  TextView item_id;
  TextView item_displayName;
  TextView item_tagline;
  TextView item_gender;
  TextView item_aboutMe;
  TextView item_url;

  final static String GooglePlus_url
  = "https://www.googleapis.com/plus/v1/people/108189587050871927619?key=<your own Google+ API key>";

  /** Called when the activity is first created. */
  @Override
  public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.main);
      item_kind = (TextView)findViewById(R.id.item_kind);
      item_id = (TextView)findViewById(R.id.item_id);
      item_displayName = (TextView)findViewById(R.id.item_displayName);
      item_tagline = (TextView)findViewById(R.id.item_tagline);
      item_gender = (TextView)findViewById(R.id.item_gender);
      item_aboutMe = (TextView)findViewById(R.id.item_aboutMe);
      item_url = (TextView)findViewById(R.id.item_url);
    
      String googlePlusResult = QueryGooglePlus();
      ParseGooglePlusJSON(googlePlusResult);
    
  }

  String QueryGooglePlus(){
   String qResult = null;
  
   HttpClient httpClient = new DefaultHttpClient();
      HttpGet httpGet = new HttpGet(GooglePlus_url);
    
      try {
       HttpEntity httpEntity = httpClient.execute(httpGet).getEntity();
      
       if (httpEntity != null){
        InputStream inputStream = httpEntity.getContent();
        Reader in = new InputStreamReader(inputStream);
        BufferedReader bufferedreader = new BufferedReader(in);
        StringBuilder stringBuilder = new StringBuilder();
       
        String stringReadLine = null;

        while ((stringReadLine = bufferedreader.readLine()) != null) {
         stringBuilder.append(stringReadLine + "\n");
        }
       
        qResult = stringBuilder.toString();
       }
      } catch (ClientProtocolException e) {
       e.printStackTrace();
       Toast.makeText(AndroidGooglePlusActivity.this,
         e.toString(),
         Toast.LENGTH_LONG).show();
      } catch (IOException e) {
       e.printStackTrace();
       Toast.makeText(AndroidGooglePlusActivity.this,
         e.toString(),
         Toast.LENGTH_LONG).show();
      }
  
   return qResult;
  }

  void ParseGooglePlusJSON(String json){
   if(json != null){
    try {
     JSONObject JsonObject = new JSONObject(json);
     item_kind.setText("kind: " + JsonObject.getString("kind"));
     item_id.setText("id: " + JsonObject.getString("id"));
           item_displayName.setText("displayName: " + JsonObject.getString("displayName"));
           item_tagline.setText("tagline: " + JsonObject.getString("tagline"));
           item_gender.setText("gender: " + JsonObject.getString("gender"));
           item_aboutMe.setText("aboutMe: " + Html.fromHtml(JsonObject.getString("aboutMe")));
           item_url.setText("url: " + JsonObject.getString("url"));
    
     Toast.makeText(AndroidGooglePlusActivity.this,
             "finished",
             Toast.LENGTH_LONG).show();
    
    } catch (JSONException e) {
     e.printStackTrace();
     Toast.makeText(AndroidGooglePlusActivity.this,
             e.toString(),
             Toast.LENGTH_LONG).show();
    }
   }
  
  }
}

<?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:id="@+id/item_kind"
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  />
<TextView
  android:id="@+id/item_id"
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  />
<TextView
  android:id="@+id/item_displayName"
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  />
<TextView
  android:id="@+id/item_tagline"
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  />
<TextView
  android:id="@+id/item_gender"
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  />
<TextView
  android:id="@+id/item_aboutMe"
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  />
<TextView
  android:id="@+id/item_url"
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  />
</LinearLayout>

note: have to modify AndroidManifest.xml to grant permission of "android.permission.INTERNET".

Download the files.

Related article:
- Example code to search Google Plus public posts

Apply your own Google+ API key

The official Google Code blog have a new post about Getting started on the Google+ API. Google+ gives users full control over their information, supporting everything from intimate conversations with family to public showcases and debates. This initial API release is focused on public data only — it lets you read information that people have shared publicly on Google+.



In order to read information from Google+, you have to apply your API Key. Visit APIs Console, you have to login your Google account to create your API key.

• Click on the API project on the left and select Create...
  


• Enter the name of your project and click Create project.
  


• Click to enable Google+ API, you will be asked to review and accept the terms of service.
  


• Click API Access, your API Key will be found.
  

Now you can copy the link with your own API key at browser to read the JSON returned from Google+.

https://www.googleapis.com/plus/v1/people/108189587050871927619?key=<your API key>





next:

- Query and Parse Google+ JSON

MicroChip's PIC24F Accessory Development Starter Kit for Android

The Microchip PIC24F Accessory Development Start Kit for Android™ is a standalone board used for evaluating and developing electronic accessories for Google’s Android operating system for smartphones and tablets.






link: PIC24F Accessory Development Starter Kit for Android

Intel Developer Forum 2011 - Keynote Paul Otellini

remark: Andy Rubin join the keynote to announce Android for Intel Architecture, at ~40:21.

Windows Developer Preview and free developer tools are available now!

Get the Windows Developer Preview and free developer tools to start building apps now.



The following versions are available for FREE to download:

• Windows Developer Preview with developer tools English, 64-bit (x64)
• Windows Developer Preview English, 64-bit (x64)
• Windows Developer Preview English, 32-bit (x86)

Link:

- http://msdn.microsoft.com/en-us/windows/apps/br229516



In the Windows Developer Preview with developer tools English, 64-bit (x64), the following are included:

• 64-bit Windows Developer Preview
• Windows SDK for Metro style apps
• Microsoft Visual Studio 11 Express for Windows Developer Preview


• Microsoft Expression Blend 5 Developer Preview
• 28 Metro style apps including the BUILD Conference app

Scroll View - scrollBy() and scrollTo()

The method scrollBy() and scrollTo() can be called t scroll a view, by the amount of pixels to scroll and specify the position to scroll.

package com.exercise.AndroidScrollBy;

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

public class AndroidScrollByActivity extends Activity {
 
 Button buttonScrollUp, buttonScrollDown, buttonScrollToTop;
 ScrollView myView;
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        buttonScrollUp = (Button)findViewById(R.id.scrollup);
        buttonScrollDown = (Button)findViewById(R.id.scrolldown);
        buttonScrollToTop = (Button)findViewById(R.id.scrolltotop);
     myView = (ScrollView)findViewById(R.id.myview);
     
     buttonScrollUp.setOnClickListener(new Button.OnClickListener(){

   @Override
   public void onClick(View v) {
    // TODO Auto-generated method stub
    myView.scrollBy(0, +20);
   }});
     
     buttonScrollDown.setOnClickListener(new Button.OnClickListener(){

   @Override
   public void onClick(View v) {
    // TODO Auto-generated method stub
    myView.scrollBy(0, -20);
   }});
     
     buttonScrollToTop.setOnClickListener(new Button.OnClickListener(){

   @Override
   public void onClick(View v) {
    // TODO Auto-generated method stub
    myView.scrollTo(0, 0);
   }});
    }
}

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"
    >
<TextView  
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="@string/hello"
    />
<Button
    android:id="@+id/scrollup"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="Scroll Up"
    />
<Button
    android:id="@+id/scrolldown"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="Scroll Down"
    />
<Button
    android:id="@+id/scrolltotop"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="Scroll To Top"
    />
<ScrollView
    android:id="@+id/myview"
    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"
    android:background="#A0A0A0"
    >
<ImageView  
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:src="@drawable/icon"
    />
<TextView  
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:textSize="40dp"
    android:text="This\nView\nCan\nBe\nScroled\nBy Buttons!"
    />
<Button
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="Dummy Button"
    />
<Button
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="Dummy Button"
    />
<Button
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="Dummy Button"
    />
</LinearLayout>
</ScrollView>
</LinearLayout>

Intel® Atom™ Processor E6xx

Intel® Atom™ Processor E6xx Port of Choice Animation Video

With the breadth of software including abundance of OSes, optimized drivers, boot loaders and other tools, the Intel Atom processor E6xx is truly the Port of Choice.

Load HTML coded data (returned from HttpPost) into WebView

In last article "Example of HttpPost on Android", the response returned from HttpPost is HTML coded String, actually it's a webpage.





It can be loaded into WebView using WebView.loadData(String data, String mimeType, String encoding).

- data: A String of data in the given encoding. The date must be URI-escaped -- '#', '%', '\', '?' should be replaced by %23, %25, %27, %3f respectively.

- mimeType: The MIMEType of the data. i.e. text/html, image/jpeg

- encoding: The encoding of the data. i.e. utf-8, base64

package com.exercise.AndroidHttpPost;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;

import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;

import android.app.Activity;
import android.os.Bundle;
import android.webkit.WebView;
import android.widget.Toast;

public class AndroidHttpPostActivity extends Activity {

 WebView webView;
 
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        webView = (WebView)findViewById(R.id.webview);
        
        BufferedReader bufferedReader = null;
        HttpClient httpClient = new DefaultHttpClient();
        HttpPost request = new HttpPost("http://search.yahoo.com/search");
        List<NameValuePair> postParameters = new ArrayList<NameValuePair>();
        postParameters.add(new BasicNameValuePair("p", "Android"));
        
        
  try {
   UrlEncodedFormEntity entity = new UrlEncodedFormEntity(postParameters);
         request.setEntity(entity);
           
         HttpResponse response= httpClient.execute(request);

   bufferedReader = new BufferedReader(
           new InputStreamReader(response.getEntity().getContent()));
   StringBuffer stringBuffer = new StringBuffer("");
   String line = "";
   String LineSeparator = System.getProperty("line.separator");
   while ((line = bufferedReader.readLine()) != null) {
    stringBuffer.append(line + LineSeparator); 
   }
   bufferedReader.close();

   Toast.makeText(AndroidHttpPostActivity.this, 
     "Finished", 
     Toast.LENGTH_LONG).show();
   
   String webData = stringBuffer.toString();
   
   webData = webData.replace("#", "%23");
   webData = webData.replace("%", "%25");
   webData = webData.replace("\\", "%27");
   webData = webData.replace("?", "%3f");
   
   webView.loadData(webData, 
     "text/html", 
     "UTF-8");
   
  } catch (ClientProtocolException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
   Toast.makeText(AndroidHttpPostActivity.this, 
     e.toString(), 
     Toast.LENGTH_LONG).show();
  } catch (IOException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
   Toast.makeText(AndroidHttpPostActivity.this, 
     e.toString(), 
     Toast.LENGTH_LONG).show();
  }finally{
   if (bufferedReader != null){
    try {
     bufferedReader.close();
    } catch (IOException e) {
     // TODO Auto-generated catch block
     e.printStackTrace();
    }
   }
  }
        
    }
}

<?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"
    />
<WebView  
    android:id="@+id/webview"
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent"
    />
</LinearLayout>

note: have to modify AndroidManifest.xml to grant permission of "android.permission.INTERNET".



Download the files.

Example of HttpPost on Android

It's a simple example using HttpPost request to "http://search.yahoo.com/search", with name/value of "p" and "Android".

package com.exercise.AndroidHttpPost;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;

import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;

import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;
import android.widget.Toast;

public class AndroidHttpPostActivity extends Activity {
 
 TextView result;
 
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        result = (TextView)findViewById(R.id.result);
        
        BufferedReader bufferedReader = null;
        HttpClient httpClient = new DefaultHttpClient();
        HttpPost request = new HttpPost("http://search.yahoo.com/search");
        List<NameValuePair> postParameters = new ArrayList<NameValuePair>();
        postParameters.add(new BasicNameValuePair("p", "Android"));
        
        
  try {
   UrlEncodedFormEntity entity = new UrlEncodedFormEntity(postParameters);
         request.setEntity(entity);
           
         HttpResponse response= httpClient.execute(request);

   bufferedReader = new BufferedReader(
           new InputStreamReader(response.getEntity().getContent()));
   StringBuffer stringBuffer = new StringBuffer("");
   String line = "";
   String LineSeparator = System.getProperty("line.separator");
   while ((line = bufferedReader.readLine()) != null) {
    stringBuffer.append(line + LineSeparator); 
   }
   bufferedReader.close();
   
   result.setText(stringBuffer.toString());
   
   Toast.makeText(AndroidHttpPostActivity.this, 
     "Finished", 
     Toast.LENGTH_LONG).show();
   
  } catch (ClientProtocolException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
   Toast.makeText(AndroidHttpPostActivity.this, 
     e.toString(), 
     Toast.LENGTH_LONG).show();
  } catch (IOException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
   Toast.makeText(AndroidHttpPostActivity.this, 
     e.toString(), 
     Toast.LENGTH_LONG).show();
  }finally{
   if (bufferedReader != null){
    try {
     bufferedReader.close();
    } catch (IOException e) {
     // TODO Auto-generated catch block
     e.printStackTrace();
    }
   }
  }
        
    }
}

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"
    >
<TextView  
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="@string/hello"
    />
<ScrollView 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent"
 >
<TextView  
    android:id="@+id/result"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    />
</ScrollView>
</LinearLayout>

note: have to modify AndroidManifest.xml to grant permission of "android.permission.INTERNET"



Download the files.



next: Load HTML coded data (returned from HttpPost) into WebView

onSaveInstanceState() and onRestoreInstanceState()

As mentioned in the article "Activity will be re-started when screen orientation changed", the activity will be destroyed and re-created once screen orientation changed.



We can call onSaveInstanceState() to retrieve per-instance state from an activity before being killed so that the state can be restored in onCreate(Bundle) or onRestoreInstanceState(Bundle) (the Bundle populated by this method will be passed to both).



example:

package com.exercise.AndroidSavedInstanceState;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

public class AndroidSavedInstanceStateActivity extends Activity {

EditText edit;
Button update;
TextView text;

/** Called when the activity is first created. */
   @Override
   public void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.main);
      
       edit = (EditText)findViewById(R.id.edit);
       update = (Button)findViewById(R.id.update);
       text = (TextView)findViewById(R.id.text);
      
       update.setOnClickListener(new Button.OnClickListener(){

  @Override
  public void onClick(View arg0) {
   // TODO Auto-generated method stub
   text.setText(edit.getText().toString());
  }});
   }

@Override
protected void onSaveInstanceState(Bundle outState) {
 // TODO Auto-generated method stub
 super.onSaveInstanceState(outState);
 outState.putString("TEXT", (String)text.getText());
}

@Override
protected void onRestoreInstanceState(Bundle savedInstanceState) {
 // TODO Auto-generated method stub
 super.onRestoreInstanceState(savedInstanceState);
 text.setText(savedInstanceState.getString("TEXT"));
}
  
}

<?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"
   />
<EditText
   android:id="@+id/edit"
   android:layout_width="fill_parent"
   android:layout_height="wrap_content"
   />
<Button
   android:id="@+id/update"
   android:layout_width="fill_parent"
   android:layout_height="wrap_content"
   android:text="Update"
   />
<TextView
   android:id="@+id/text"
   android:layout_width="fill_parent"
   android:layout_height="wrap_content"
   />
</LinearLayout>

Without onSaveInstanceState() and onRestoreInstanceState(), TextView text will be cleared everytime the screen orientation changed.

Notice that if the activity finished completely, the state will not be saved.

Next:
- More on onSaveInstanceState() and onRestoreInstanceState()

Overview of Web Apps on Android

There are essentially two ways to deliver an application on Android: as a client-side application (developed using the Android SDK and installed on user devices as an .apk) or as a web application (developed using web standards and accessed through a web browser—there's nothing to install on user devices).

Google have a document providing the overview of Web Apps on Android.

Use Handler and Runnable to generate a periodic event

A Handler allows you to send and process Message and Runnable objects associated with a thread's MessageQueue. Each Handler instance is associated with a single thread and that thread's message queue. When you create a new Handler, it is bound to the thread / message queue of the thread that is creating it -- from that point on, it will deliver messages and runnables to that message queue and execute them as they come out of the message queue.



There are two main uses for a Handler: (1) to schedule messages and runnables to be executed as some point in the future; and (2) to enqueue an action to be performed on a different thread than your own.



It's a example using Handler and Runnable to generate a periodic event in 500ms.

package com.exercise.AndroidHandlerRunnable;

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

public class AndroidHandlerRunnableActivity extends Activity {
 
 private int cnt = 0;
 Button Start, Stop;
 TextView counter;
 private Handler handler = new Handler();
 
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        counter = (TextView)findViewById(R.id.counter);
        Start = (Button)findViewById(R.id.Start);
        Start.setEnabled(true);
        Stop = (Button)findViewById(R.id.Stop);
        Stop.setEnabled(false);
        
        Start.setOnClickListener(new Button.OnClickListener(){

   @Override
   public void onClick(View v) {
    // TODO Auto-generated method stub
    handler.post(timedTask);
    Start.setEnabled(false);
    Stop.setEnabled(true);
   }});
        
        Stop.setOnClickListener(new Button.OnClickListener(){

   @Override
   public void onClick(View v) {
    // TODO Auto-generated method stub
    handler.removeCallbacks(timedTask);
    Start.setEnabled(true);
    Stop.setEnabled(false);
   }});
    }
    
    private Runnable timedTask = new Runnable(){

  @Override
  public void run() {
   // TODO Auto-generated method stub
   cnt++;
   counter.setText(String.valueOf(cnt));
   handler.postDelayed(timedTask, 500);
  }};
}

<?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/Start"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="Start"
    />
<Button  
    android:id="@+id/Stop"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="Stop"
    />
<TextView  
    android:id="@+id/counter"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    />
</LinearLayout>

Theme

Theme is some style elements can be applied across an entire activity, or application.



Android OS provide a number of pre-build Theme for you in Android SDK; for example: you can open the file below, you can find a number of pre-build theme start with "Theme.".



/android-sdk-linux_x86/platforms/android-8/data/res/values/themes.xml



such as:

• Theme.NoTitleBar


• Theme.NoTitleBar.Fullscreen


• Theme.Light


• Theme.Light.NoTitleBar


• Theme.Light.NoTitleBar.Fullscreen


• ...

To apply Theme on activity (or on whole application), you can add attribute of "android:theme=..." in AndroidManifest.xml, under <activity> (or <application>).



example of android:style/Theme.Panel:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="com.exercise.AndroidTheme"
      android:versionCode="1"
      android:versionName="1.0">
    <uses-sdk android:minSdkVersion="8" />

    <application android:icon="@drawable/icon" android:label="@string/app_name"
     android:theme="@android:style/Theme.Panel">
        <activity android:name=".AndroidThemeActivity"
                  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>
</manifest>

Set styling text on TextView

Define your string resource (stylingtext) in /res/values/strings.xml, with styling markup.

<?xml version="1.0" encoding="utf-8"?>

<resources>

    <string name="hello">Hello World, AndroidStylingTextActivity!</string>

    <string name="app_name">AndroidStylingText</string>

    <string name="stylingtext">

    Styling Text:\n

    <i>Italic</i> <b>Bold</b> <monospace>Monospace</monospace>\n 

    <strike>Strike</strike> <sup>Superscript</sup> <sub>Subscript</sub> <u>Underline</u>\n

    <big><big><big>Big x 3 </big>Big x 2 </big>Big</big> <small>Small <small>Small x 2</small></small>

    </string>

</resources>

Then you can refer the string resource in your layout file, 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"

    >

<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="@string/stylingtext"

    />

</LinearLayout>

Apply style on Text

To create our own style, create a XML file /res/values/style.xml.

<?xml version="1.0" encoding="utf-8"?>

<resources>

    <style name="mystyle">

		<item name="android:layout_width">fill_parent</item>

		<item name="android:layout_height">wrap_content</item>

		<item name="android:textColor">#A0A0A0</item>

		<item name="android:typeface">monospace</item>

    </style>

    <style name="mystyle.20dp">

		<item name="android:textSize">20dp</item>

    </style>

    <style name="mystyle.30dp">

		<item name="android:textSize">30dp</item>

    </style>

    <style name="mystyle.20dp.bold">

		<item name="android:textStyle">bold</item>

    </style>

</resources>

Then, we can refer it in our layout, main.xml. Android also pre-defined some style for using.

<?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  

	style="@style/mystyle" 

    android:text="mystyle"

    />

<TextView  

	style="@style/mystyle.20dp" 

    android:text="mystyle.20dp"

    />

<TextView  

	style="@style/mystyle.20dp.bold"

    android:text="mystyle.20dp.bold"

    />

<TextView  

	style="@style/mystyle.30dp" 

    android:text="mystyle.30dp"

    />

<TextView  

    android:layout_width="fill_parent" 

    android:layout_height="wrap_content" 

	style="@android:style/TextAppearance"

    android:text="Android build-in style: TextAppearance"

    />

<TextView  

    android:layout_width="fill_parent" 

    android:layout_height="wrap_content" 

    android:background="@android:color/background_light"

	style="@android:style/TextAppearance.Inverse"

    android:text="Android build-in style: TextAppearance.Inverse"

    />

<TextView  

    android:layout_width="fill_parent" 

    android:layout_height="wrap_content" 

	style="@android:style/TextAppearance.Small"

    android:text="Android build-in style: TextAppearance.Small"

    />

<TextView  

    android:layout_width="fill_parent" 

    android:layout_height="wrap_content" 

	style="@android:style/TextAppearance.Medium"

    android:text="Android build-in style: TextAppearance.Medium"

    />

<TextView  

    android:layout_width="fill_parent" 

    android:layout_height="wrap_content" 

	style="@android:style/TextAppearance.Large"

    android:text="Android build-in style: TextAppearance.Large"

    />    

</LinearLayout>

Bubble Sort

package com.exercise.AndroidBubbleSort;



import java.util.Random;



import android.app.Activity;

import android.os.Bundle;

import android.widget.TextView;



public class AndroidBubbleSortActivity extends Activity {

	

	TextView src, result;

	int[] data = new int[10];

	

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

    @Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.main);

        src = (TextView)findViewById(R.id.src);

        result = (TextView)findViewById(R.id.result);

        

        Random random = new Random();

        String stringSrc = "Src = ";

        for (int i = 0; i < data.length; i++){

        	data[i] = random.nextInt(100);

        	stringSrc += data[i] + " ";

        }

        

        src.setText(stringSrc);

        

        bubblesort();

        

        String stringResult = "Result = ";

        for (int i = 0; i < data.length; i++){

        	stringResult += data[i] + " ";

        }

        

        result.setText(stringResult);

        

    }

    

    void bubblesort() {

    	int min;



    	for (int i = 0; i < data.length - 1; i++){

    		min = i;

    		for (int  j = i + 1; j < data.length; j++){

    			if (data[j] < data[min]){

    				min = j;

    			}

    		}

    		if (i != min){ 

    			int tmp = data[i];

    			data[i] = data[min];

    			data[min] = tmp;

	      }

    	}

    }



}

android:onClick - define callback method when a View clicked, in XML layout.

A callback method can be defined in XML layout file, using "android:onClick". It define the name of the method in this View's context to invoke when the view is clicked. This name must correspond to a public method that takes exactly one parameter of type View.

<?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:layout_width="fill_parent" 

    android:layout_height="wrap_content" 

    android:text="Button 1"

    android:onClick="onClick"

    />

<Button  

    android:layout_width="fill_parent" 

    android:layout_height="wrap_content" 

    android:text="Button 2"

    android:onClick="onClick"

    />

<Button  

    android:layout_width="fill_parent" 

    android:layout_height="wrap_content" 

    android:text="Button 3"

    android:onClick="onClick"

    />

</LinearLayout>

package com.exercise.AndroidOnClick;



import android.app.Activity;

import android.os.Bundle;

import android.view.View;

import android.widget.Toast;



public class AndroidOnClickActivity extends Activity {

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

    @Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.main);

    }

    

    public void onClick(View view){

    	Toast.makeText(AndroidOnClickActivity.this, 

    			"onClick:\n" + view.toString(), 

    			Toast.LENGTH_LONG).show();

    }

}