Android上下滑动切换背景

最近想做一个左右滑动切换背景图片的应用，特地将自己的研究分享一下：

这个需要继承2个监听接口 OnGestureListener,  OnTouchListener

关于这2个接口大家可以在网上查一下

同事需要设置2个属性 bgLayout.setOnTouchListener(this);

             bgLayout.setLongClickable(true);

并且在这个函数中有如下这几句话

public boolean onTouch(View v, MotionEvent event) {

// TODO Auto-generated method stub

return this.mGesture.onTouchEvent(event);

}

附送代码：

public class SwitcherActivity extends Activity implements OnGestureListener,		OnTouchListener {	/** Called when the activity is first created. */	LinearLayout bgLayout = null;	private GestureDetector mGesture = null;	private int flag = 3;	@Override	public void onCreate(Bundle savedInstanceState) {		super.onCreate(savedInstanceState);		setContentView(R.layout.main);		mGesture = new GestureDetector(this);		bgLayout = (LinearLayout) findViewById(R.id.bg);		bgLayout.setBackgroundResource(R.drawable.bg3);		bgLayout.setOnTouchListener(this);		bgLayout.setLongClickable(true);	}	public boolean onDown(MotionEvent e) {		// TODO Auto-generated method stub		return false;	}	public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,			float velocityY) {		// 处理左右滑动		if (e1.getX() - e2.getX() > 100) { // 向左滑动			if (flag == 3) {				bgLayout.setBackgroundResource(R.drawable.bg4);				flag = 4;				return true;			}			if (flag == 4) {				bgLayout.setBackgroundResource(R.drawable.bg5);				flag = 5;				return true;			}			if (flag == 1) {				bgLayout.setBackgroundResource(R.drawable.bg2);				flag = 2;				return true;			}			if (flag == 2) {				bgLayout.setBackgroundResource(R.drawable.bg3);				flag = 3;				return true;			}		} else if (e1.getX() - e2.getX() < -100) { // 向右滑动			if (flag == 3) {				bgLayout.setBackgroundResource(R.drawable.bg2);				flag = 2;				return true;			}			if (flag == 2) {				bgLayout.setBackgroundResource(R.drawable.bg1);				flag = 1;				return true;			}			if (flag == 5) {				bgLayout.setBackgroundResource(R.drawable.bg4);				flag = 4;				return true;			}			if (flag == 4) {				bgLayout.setBackgroundResource(R.drawable.bg3);				flag = 3;				return true;			}		}		return false;	}	public void onLongPress(MotionEvent e) {		// TODO Auto-generated method stub	}	public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX,			float distanceY) {		// TODO Auto-generated method stub		return false;	}	public void onShowPress(MotionEvent e) {		// TODO Auto-generated method stub	}	public boolean onSingleTapUp(MotionEvent e) {		// TODO Auto-generated method stub		return false;	}	public boolean onTouch(View v, MotionEvent event) {		// TODO Auto-generated method stub		return this.mGesture.onTouchEvent(event);	}}