android Button拖动

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">
<Button android:id="@+id/btn_hello" android:layout_width="fill_parent"
android:layout_height="wrap_content" android:text="@string/hello" />
</LinearLayout>

Touch.java
public class Touch 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(); //redraw
break;
case MotionEvent.ACTION_UP:
break;
}

return false;
}
});
}
}

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