Message Passing parameter in Android [Android evolution 16th]

 

Recently, we found that the Message can be used to send parameters. This is a good idea. I wrote an example, clicked on the screen, sent a Message to the Activity, passed two parameters, and destroyed the activity!

Reprinted please indicate the source: http://blog.csdn.net/wdaming1986/article/details/6748688

 

Open the program interface: Click the screen and destroy the activity to bring up Toast:

 

 

Check the Code:

MainActivity. Java class:

 

Package com.cn. android;

 

Import android. app. Activity;

Import android. OS. Bundle;

Import android. OS. Handler;

Import android. OS. Message;

Import android. widget. Toast;

 

Public class MainActivity extends Activity {

 

Final static int CANSHU = 1;

Public Handler mHandler = new Handler (){

Public void handleMessage (Message msg ){

Switch (msg. what ){

Case CANSHU: String str1 = msg. getData (). getString ("text1"); // accept the parameters passed by msg

String str2 = msg. getData (). getString ("text2"); // accepts the parameters passed by msg.

InitFinishMainActivity (str1, str2 );

Break;

Default: break;

}

}

};

@ Override

Public void onCreate (Bundle savedInstanceState ){

Super. onCreate (savedInstanceState );

InitMainActivity ();

}

Public void InitMainActivity ()

{

SetContentView (new MainActivityView (this, this ));

}

Public void initFinishMainActivity (String str1, String str2)

{

Toast. makeText (MainActivity. this, str1 + str2, Toast. LENGTH_LONG). show ();

Finish ();

}

}

 

MainActivityView. Java class:

 

Package com.cn. android;

 

Import android. content. Context;

Import android. graphics. Bitmap;

Import android. graphics. BitmapFactory;

Import android. graphics. Canvas;

Import android. graphics. Rect;

Import android. OS. Bundle;

Import android. OS. Message;

Import android. view. MotionEvent;

Import android. view. View;

 

Public class MainActivityView extends View {

 

Private MainActivity;

Private Context context;

Private Bitmap m_Bitmap;

Public MainActivityView (Context context, MainActivity activity ){

Super (context );

This. activity = activity;

This. context = context;

InitBitmap ();

}

Www.2cto.com

Public void initBitmap ()

{

M_Bitmap = BitmapFactory. decodeResource (this. getResources (), R. drawable. bg );

}

 

@ Override

Public void onDraw (Canvas canvas ){

Canvas. drawBitmap (m_Bitmap, 0, 0, null );

}

 

@ Override

Public boolean onTouchEvent (MotionEvent event ){

Int x = (int) event. getX ();

Int y = (int) event. getY ();

Rect rect;

Rect = new Rect (0, 0, 320,480 );

If (rect. contains (x, y ))

{

Message msg = new Message ();

Msg. what = MainActivity. CANSHU;

Bundle bundle = new Bundle ();

Bundle. putString ("text1", "Daming's message passing parameter example! "); // Store data in Bundle

Bundle. putString ("text2", "Time: 2011-09-05"); // put data to Bundle

Msg. setData (bundle); // mes uses Bundle to transmit data

Activity. mHandler. sendMessage (msg); // use handler in activity to send messages

}

Return super. onTouchEvent (event );

}

}