Android button 拖动

 

 
android:orientation="vertical" android:layout_width="fill_parent" 
android:layout_height="fill_parent"> 
android:layout_height="wrap_content" android:text="@string/hello" /> 

=================

package com.cn;  
 
import android.app.Activity;  
import android.os.Bundle;  
import android.util.Log;  
import android.view.MotionEvent;  
import android.view.View;  
import android.view.View.OnTouchListener;  
import android.widget.Button;  
 
public class MainButton extends Activity {  
/** Called when the activity is first created. */ 
@Override 
public void onCreate(Bundle savedInstanceState) {  
super.onCreate(savedInstanceState);  
setContentView(R.layout.main);  
 
final Button btn = (Button) findViewById(R.id.btn_hello);  
 
btn.setOnTouchListener(new OnTouchListener() {  
int[] temp = new int[] { 0, 0 };  
 
public boolean onTouch(View v, MotionEvent event) {  
 
int eventaction = event.getAction();  
Log.i("&&&", "onTouchEvent:" + eventaction);  
 
int x = (int) event.getRawX();  
int y = (int) event.getRawY();  
 
switch (eventaction) {  
 
case MotionEvent.ACTION_DOWN: // touch down so check if the  
temp[0] = (int) event.getX();  
temp[1] = y - v.getTop();  
break;  
 
case MotionEvent.ACTION_MOVE: // touch drag with the ball  
v.layout(x - temp[0], y - temp[1], x + v.getWidth()  
- temp[0], y - temp[1] + v.getHeight());  
 
v.postInvalidate();  
break;  
case MotionEvent.ACTION_UP:  
break;  
}  
return false;  
}  
});  
}  
}