Android_左右滑动切换背景

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);
	}
}