Android基于ImageSwitcher实现图片切换功能

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package com.example.photoalbum; 
 
import android.app.Activity; 
import android.os.Bundle; 
import android.view.MotionEvent; 
import android.view.View; 
import android.view.View.OnTouchListener; 
import android.view.ViewGroup; 
import android.view.animation.AnimationUtils; 
import android.widget.ImageSwitcher; 
import android.widget.ImageView; 
import android.widget.LinearLayout; 
import android.widget.RelativeLayout.LayoutParams; 
import android.widget.Toast; 
import android.widget.ViewSwitcher.ViewFactory; 
 
public class ShowPhotoActivity extends Activity implements ViewFactory, OnTouchListener{ 
  /** 
   * ImagaSwitcher 的引用 
   */ 
  private ImageSwitcher mImageSwitcher; 
  /** 
   * 图片id数组 
   */ 
  private int[] imgIds; 
  /** 
   * 当前选中的图片id序号 
   */ 
  private int currentPosition; 
  /** 
   * 按下点的X坐标 
   */ 
  private float downX; 
  /** 
   * 装载点点的容器 
   */ 
  private LinearLayout linearLayout; 
  /** 
   * 点点数组 
   */ 
  private ImageView[] tips; 
  
  @Override 
  protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.show_photo); 
     
    imgIds = new int[]{R.drawable.item01,R.drawable.item02,R.drawable.item03,R.drawable.item04, 
        R.drawable.item05, R.drawable.item06, R.drawable.item07, R.drawable.item08,R.drawable.item09, 
        R.drawable.item10, R.drawable.item11, R.drawable.item12}; 
    //实例化ImageSwitcher 
    mImageSwitcher = (ImageSwitcher) findViewById(R.id.imageSwitcher1); 
    //设置Factory 
    mImageSwitcher.setFactory(this); 
    //设置OnTouchListener，我们通过Touch事件来切换图片 
    mImageSwitcher.setOnTouchListener(this); 
     
    linearLayout = (LinearLayout) findViewById(R.id.viewGroup); 
     
    tips = new ImageView[imgIds.length]; 
    for(int i=0; i downX){ 
        if(currentPosition > 0){ 
          //设置动画，这里的动画比较简单，不明白的去网上看看相关内容 
          mImageSwitcher.setInAnimation(AnimationUtils.loadAnimation(getApplication(), R.anim.left_in)); 
          mImageSwitcher.setOutAnimation(AnimationUtils.loadAnimation(getApplication(), R.anim.right_out)); 
          currentPosition --; 
          mImageSwitcher.setImageResource(imgIds[currentPosition % imgIds.length]); 
          setImageBackground(currentPosition); 
        }else{ 
          Toast.makeText(getApplication(), "已经是第一张", Toast.LENGTH_SHORT).show(); 
        } 
      }  
       
      if(lastX 

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