Android按钮移动的同时可以进行缩放动画吗

[u011433995]

最近在看动画效果类，然后自己写了个Button的ontouch事件，并且在action_down中播放缩放动画，效果是有，不过就是花屏啊！请问大神们我的这种想法是否可行？若可行是哪里的问题，若不行则其他方法是什么？

package com.movebutton;

import android.app.Activity;
import android.graphics.Rect;
import android.os.Bundle;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.View.OnTouchListener;
import android.view.animation.Animation;
import android.view.animation.ScaleAnimation;
import android.view.Window;
import android.widget.ImageButton;
import android.widget.TextView;

public class MainActivity extends Activity implements OnTouchListener,
		OnClickListener {

	private ImageButton moveButton;
	private int screenW, screenH;
	private int downX, downY;
	private TextView tv;
	ScaleAnimation animation;
	

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);

		DisplayMetrics dm = getResources().getDisplayMetrics();
		screenW = dm.widthPixels;
		screenH = dm.heightPixels;
		moveButton = (ImageButton) this.findViewById(R.id.moveButton);
		tv = (TextView) this.findViewById(R.id.textView1);
		moveButton.setOnTouchListener(this);
		animation = new ScaleAnimation(1.0f, 1.5f, 1.0f, 1.5f,
				Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF,
				0.5f);
		animation.setDuration(1000);// 设置动画持续时间
		// animation.setRepeatCount(int repeatCount);//设置重复次数
		animation.setFillAfter(true);// 动画执行完后是否停留在执行完的状态
		// animation.setStartOffset(long startOffset);//执行前的等待时间
	}

	@Override
	public boolean onTouch(View v, MotionEvent event) {
		int action = event.getAction();
		switch (action) {
		case MotionEvent.ACTION_DOWN:
			// 点击时按钮所在位置
			downX = (int) event.getRawX();
			downY = (int) event.getRawY();
			v.startAnimation(animation);
			break;
		case MotionEvent.ACTION_MOVE:
			int dx = (int) event.getRawX() - downX;
			int dy = (int) event.getRawY() - downY;
			int left = v.getLeft() + dx;
			int top = v.getTop() + dy;
			int right = v.getRight() + dx;
			int bottom = v.getBottom() + dy;

			// 判断移动是否超出屏幕

			if (left < 0) {
				left = 0;
				right = left + v.getWidth();
			}
			if (top < 0) {
				top = 0;
				bottom = top + v.getHeight();
			}
			if (right > screenW) {
				right = screenW;
				left = right - v.getWidth();
			}
			if (bottom > screenH) {
				bottom = v.getHeight();
				top = screenH - v.getHeight() + v.getHeight();
			}

			downX = (int) event.getRawX();
			downY = (int) event.getRawY();

			v.layout(left, top, right, bottom);
			v.postInvalidate();
			// tv.setText("左："+left+"上："+top+"右："+right+"下："+bottom);
			Log.e("", "左：" + left + "上：" + top + "右：" + right + "下：" + bottom
					+ "高:" + screenH);
			break;
		case MotionEvent.ACTION_UP:
//			animation.cancel();
			break;
		}
		return false;
	}

	@Override
	public void onClick(View v) {

	}

	@Override
	public void onWindowFocusChanged(boolean hasFocus) {
		int contentTop = 
				getWindow().findViewById(Window.ID_ANDROID_CONTENT).getTop();
		Rect rect = new Rect();
		Window window = getWindow();
		window.getDecorView().getWindowVisibleDisplayFrame(rect);
		int statusBarHeight = rect.top;  //此处获取的是状态栏的高度;
		int contentViewTop = 
				window.findViewById(Window.ID_ANDROID_CONTENT).getTop();
		//此处获取的是状态栏和标题栏的总高度;
		//获取了状态栏和标题栏的总高度，也获取到了状态栏的高度，那么标题栏的高度就是：
		int titleBarHeight = contentViewTop - statusBarHeight;
		super.onWindowFocusChanged(hasFocus);
	}
}