Android编程实现大图滚动显示的方法

<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;
    }
  });
}