ViewFlipper 手势滑动

package com.example.android_viewflipper2;

import android.support.v7.app.ActionBarActivity;
import android.support.v7.app.ActionBar;
import android.support.v4.app.Fragment;
import android.graphics.Color;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.util.Log;
import android.view.GestureDetector;
import android.view.GestureDetector.OnGestureListener;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.ViewFlipper;
import android.os.Build;

public class MainActivity extends ActionBarActivity {
    //定义一个flipper
    private ViewFlipper flipper;
    private float startX;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        flipper = (ViewFlipper) findViewById(R.id.flipper);
        //将图片添加进flipper 并且设置背景色
        flipper.addView(getImageView(R.drawable.pic1));
        flipper.addView(getImageView(R.drawable.pic2));
        flipper.addView(getImageView(R.drawable.pic3));
        flipper.addView(getImageView(R.drawable.pic4));
        flipper.setBackgroundColor(Color.BLACK);
        // flipper.setFlipInterval(5000);
        // flipper.setInAnimation(this, R.anim.anim_in);
        // flipper.setOutAnimation(this, R.anim.anim_out);
        // flipper.startFlipping();
        // detector=new GestureDetector(this, this);
    }
          //创建ImageView对象，通过resId用setBackgroundresource方法为Image添加图像属性
    private ImageView getImageView(int resId) {
        ImageView image = new ImageView(this);
        image.setBackgroundResource(resId);
        return image;
    }
    //滑动动作
    @Override
    public boolean onTouchEvent(MotionEvent event) {
        // TODO Auto-generated method stub
        switch (event.getAction()) {
        case MotionEvent.ACTION_DOWN: {
            startX=event.getX();
            break;
        }
        
        case MotionEvent.ACTION_UP:
        {
            //滑动响应
            if(event.getX()-startX>50)
            {
                 flipper.setInAnimation(this, R.anim.left_in);
                 flipper.setOutAnimation(this, R.anim.left_out);
                 flipper.showNext();
                
            }
            //滑动响应
            if(startX-event.getX()>50)
            {
                 flipper.setInAnimation(this, R.anim.right_in);
                 flipper.setOutAnimation(this, R.anim.right_out);
                 flipper.showPrevious();
            }
            break;
        }
        }

        return super.onTouchEvent(event);

    }

}