Android ontouch事件处理的三种方式

package com.xiaohui.ontouch; import android.app.Activity; import android.content.Context; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.os.Bundle; import android.util.Log; import android.view.MotionEvent; import android.view.View; public class Ontouch extends Activity { /** Called when the activity is first created. */ MyView myview; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); myview = new MyView(this); setContentView(myview); } @Override public boolean onTouchEvent(MotionEvent event) { switch (event.getAction()) { case MotionEvent.ACTION_DOWN: Log.d("touch", "down"); myview.x = (int) event.getX(); myview.y = (int) (event.getY() - 52); myview.postInvalidate(); break; case MotionEvent.ACTION_MOVE: Log.d("touch", "move"); myview.x = (int) event.getX(); myview.y = (int) (event.getY() - 52); myview.postInvalidate(); break; case MotionEvent.ACTION_UP: Log.d("touch", "up"); myview.x = -100; myview.y = -100; myview.postInvalidate(); break; } return super.onTouchEvent(event); } class MyView extends View{ Paint paint; int x = 50; int y = 50; int w = 50; public MyView (Context context){ super(context); paint = new Paint(); } @Override protected void onDraw(Canvas canvas) { canvas.drawColor(Color.BLUE); paint.setColor(Color.RED); canvas.drawRect(x, y, x+w, y+w, paint); super.onDraw(canvas); } } }