Android实现大图滚动显示效果

<ImageView 
  android:layout_width="wrap_content" 
  android:layout_height="wrap_content" 
  android:id="@+id/img" 
  android:scaleType="center" 
  android:background="#fff" 
  android:src="@drawable/picName" 
/> 

@Override 
public void onCreate(Bundle savedInstanceState) { 
  super.onCreate(savedInstanceState); 
 
  setContentView(R.layout.xml_name_layout); 
 
  final ImageView switcherView = (ImageView) this.findViewById(R.id.img); 
 
  switcherView.setOnTouchListener(new View.OnTouchListener() { 
 
    public boolean onTouch(View arg0, MotionEvent event) { 
 
      float curX, curY; 
 
      switch (event.getAction()) { 
 
        case MotionEvent.ACTION_DOWN: 
          mx = event.getX(); 
          my = event.getY(); 
          break; 
        case MotionEvent.ACTION_MOVE: 
          curX = event.getX(); 
          curY = event.getY(); 
          switcherView.scrollBy((int) (mx - curX), (int) (my - curY)); 
          mx = curX; 
          my = curY; 
          break; 
        case MotionEvent.ACTION_UP: 
          curX = event.getX(); 
          curY = event.getY(); 
          switcherView.scrollBy((int) (mx - curX), (int) (my - curY)); 
          break; 
      } 
 
      return true; 
    } 
  }); 
 
}