一个简单的android图片浏览器demo（待完善）

  1 package com.kevin.picturebrowser;
  2 
  3 import java.lang.reflect.Field;
  4 import java.util.ArrayList;
  5 
  6 import android.os.Bundle;
  7 import android.app.Activity;
  8 import android.app.ActionBar.LayoutParams;
  9 import android.view.Menu;
 10 import android.view.MotionEvent;
 11 import android.view.View;
 12 import android.view.View.OnTouchListener;
 13 import android.view.animation.AnimationUtils;
 14 import android.widget.ImageSwitcher;
 15 import android.widget.ImageView;
 16 import android.widget.ViewSwitcher.ViewFactory;
 17 
 18 public class MainActivity extends Activity implements ViewFactory
 19 {
 20 
 21     private ImageSwitcher imageSwitcher1;
 22     private int downX,upX;
 23     private ArrayList<Integer> imgPool = new ArrayList<Integer>(); //图片库
 24     private int ImgPos = 0;
 25 
 26     @Override
 27     protected void onCreate(Bundle savedInstanceState)
 28     {
 29         super.onCreate(savedInstanceState);
 30         setContentView(R.layout.activity_main);
 31         
 32         InitialPicturePool();
 33         InitialImageSwitcher();
 34         BindTouchListener();
 35         
 36     }
 37 
 38 
 39     @Override
 40     public boolean onCreateOptionsMenu(Menu menu)
 41     {
 42         // Inflate the menu; this adds items to the action bar if it is present.
 43         getMenuInflater().inflate(R.menu.main, menu);
 44         return true;
 45     }
 46 
 47     private void InitialImageSwitcher()
 48     {
 49         imageSwitcher1 = (ImageSwitcher) findViewById(R.id.imageswitcher1);
 50         imageSwitcher1.setFactory(this);
 51         imageSwitcher1.setInAnimation(AnimationUtils.loadAnimation(this,
 52                 android.R.anim.fade_in));
 53         imageSwitcher1.setOutAnimation(AnimationUtils.loadAnimation(this,
 54                 android.R.anim.fade_out));
 55         imageSwitcher1.setImageResource(imgPool.get(0));
 56     }
 57 
 58     private void BindTouchListener()
 59     {
 60         imageSwitcher1.setOnTouchListener(new OnTouchListener()
 61         {
 62 
 63             @Override
 64             public boolean onTouch(View v, MotionEvent event)
 65             {
 66                 if (event.getAction() == MotionEvent.ACTION_DOWN)
 67                 {
 68                     downX = (int) event.getX(); //取得按下时的坐标
 69                     return true;
 70                 }
 71                 else if(event.getAction() == MotionEvent.ACTION_UP)
 72                 {
 73                     upX = (int) event.getX(); //取得松开时的坐标
 74                     if(upX - downX > 100)
 75                     {
 76                         imageSwitcher1.setInAnimation(AnimationUtils.loadAnimation(
 77                                 MainActivity.this, android.R.anim.slide_in_left));
 78                         imageSwitcher1.setOutAnimation(AnimationUtils.loadAnimation(
 79                                 MainActivity.this, android.R.anim.slide_out_right));
 80                         imageSwitcher1.setImageResource(GetPreviousPicture());
 81                     }
 82                     else if(downX - upX > 100)
 83                     {
 84                         imageSwitcher1.setInAnimation(AnimationUtils.loadAnimation(
 85                                 MainActivity.this, android.R.anim.fade_in));
 86                         imageSwitcher1.setOutAnimation(AnimationUtils.loadAnimation(
 87                                 MainActivity.this, android.R.anim.fade_out));
 88                         imageSwitcher1.setImageResource(GetNextPicture());
 89                     }
 90                 }
 91                 return false;
 92             }
 93         });
 94     }
 95 
 96     @Override
 97     public View makeView()
 98     {
 99         ImageView iv = new ImageView(this);
100         iv.setBackgroundColor(0xFF000000);
101         iv.setScaleType(ImageView.ScaleType.FIT_CENTER);
102         iv.setLayoutParams(new ImageSwitcher.LayoutParams(
103                 LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));
104         return iv;
105     }
106     
107     private void InitialPicturePool()
108     {
109          Field[] fields = R.drawable.class.getDeclaredFields();
110          for(Field field : fields)
111          {
112              int index = 0;
113              try
114              {
115                 index = field.getInt(R.drawable.class); 
116              }
117              catch(IllegalArgumentException e)
118              {
119                  e.printStackTrace();
120              }
121              catch(IllegalAccessException e)
122              {
123                  e.printStackTrace();
124              }
125              
126              imgPool.add(index);
127          }
128     }
129     
130     private  Integer GetNextPicture()
131     {    
132         ImgPos++;
133         if(ImgPos > imgPool.size()-1)
134             ImgPos = 0;
135         
136         return imgPool.get(ImgPos);
137     }
138     
139     private Integer GetPreviousPicture()
140     {
141         ImgPos--;
142         if(ImgPos < 0)
143             ImgPos = imgPool.size()-1;
144         
145         return imgPool.get(ImgPos);
146     }
147 }

XML：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >

    <ImageSwitcher
    　　android:id="@+id/imageswitcher1"
    　　android:layout_width="fill_parent"
    　　android:layout_height="fill_parent"
    　　android:layout_centerVertical="true">
    </ImageSwitcher>
   
</RelativeLayout>