Android中如何移动图片

页面：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity" >

<ImageView
android:id="@+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_marginLeft="94dp"
android:layout_marginTop="170dp"
android:src="@drawable/ic_launcher"
android:scaleType="matrix" />

</RelativeLayout>

代码部分：

package com.hbsi.csdn.DragImage;

import android.os.Bundle;
import android.app.Activity;
import android.graphics.Matrix;
import android.graphics.Point;
import android.graphics.PointF;
import android.view.Menu;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.widget.ImageView;

public class MainActivity extends Activity {
ImageView iv;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
iv=(ImageView) findViewById(R.id.imageView1);
iv.setOnTouchListener(new OnTouchListener() {
Matrix matrix=new Matrix();
PointF startPoint=new PointF();
@Override
public boolean onTouch(View v, MotionEvent event) {
// TODO Auto-generated method stub
switch(event.getAction()&MotionEvent.ACTION_MASK){
case
MotionEvent.ACTION_DOWN:
startPoint.set(event.getX(),event.getY());
break;
case
MotionEvent.ACTION_UP:
break;
case
MotionEvent.ACTION_MOVE:
float dx,dy;
dx=event.getX()-startPoint.x;
dy=event.getY()-startPoint.y;
matrix.postTranslate(dx, dy);
startPoint.set(event.getX(),event.getY());
break;
case
MotionEvent.ACTION_POINTER_1_DOWN:
break;
case
MotionEvent.ACTION_POINTER_1_UP:
break;

}
iv.setImageMatrix(matrix);
return false;
}
});
}
}

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