ImageView随着手一动，用到onTouchEvent(MotionEvent event)

随着学习，经验是增加了，但是还是很缺少经验，我分享这个代码只是更大家分享小小的成果，顺便永久性保存这个代码，以后用到的时候可以拿来就用，需要改正也是很方便的，毕竟自己动脑子写的，每一步的功能都理解的很清楚。

package com.example.ontouchmove;

import android.os.Bundle;
import android.app.Activity;
import android.util.DisplayMetrics;
import android.view.Menu;
import android.view.MotionEvent;
import android.widget.AbsoluteLayout;
import android.widget.ImageView;

public class MainActivity extends Activity {

private ImageView imgv;
private float m;
private float d;
private float x;
private float y;
private int imgWidth;
private int imgHeight;
private float mY;
private float mX;
private int ScreenX;
private int ScreenY;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    imgv=(ImageView) findViewById(R.id.imageView1);
    /* 取得屏幕对象 */   
    DisplayMetrics dm = new DisplayMetrics();   
    getWindowManager().getDefaultDisplay().getMetrics(dm);  
    /* 取得屏幕解析像素 */   
    ScreenX = dm.widthPixels;   
    ScreenY = dm.heightPixels;   
    /* 设定图片的宽高 */ 

    imgWidth = 100;
    imgHeight =100; 

}

@SuppressWarnings("deprecation")
@Override
   public boolean onTouchEvent(MotionEvent event) {
    // TODO Auto-generated method stub
        /*获取手触屏的位置*/  
    m=event.getX();
    d=event.getY();
    x = event.getX()-45;
    y = event.getY()-160;

     /*默认微调图片与指针的相对位置*/ 
    mX=x-(imgWidth/2);   
    mY=y-(imgHeight/2); 

        /*分开处理触摸的时间*/
    switch (event.getAction()) {

    /*点屏幕*/
    case MotionEvent.ACTION_DOWN  :

         imgv.setLayoutParams(new
                 AbsoluteLayout.LayoutParams
                    (imgWidth, imgHeight, (int)mX,(int)mY));

        break;
    /*移动位置*/
    case MotionEvent.ACTION_MOVE  :

         imgv.setLayoutParams(new
                    AbsoluteLayout.LayoutParams
                    (imgWidth, imgHeight, (int)mX,(int)mY));

        break;  

        /*离开屏幕*/
    case MotionEvent.ACTION_UP  :

         imgv.setLayoutParams(new
                    AbsoluteLayout.LayoutParams
                    (imgWidth, imgHeight, (int)mX,(int)mY));

        break;

    default:
        break;
    }

    return true;
   }

}