继承SurfaceView实现图片自动播放

代码如下，多多交流。

  1 package com.farben.ams.widget;
  2 
  3 import java.io.FileInputStream;
  4 import java.io.FileNotFoundException;
  5 import java.util.List;
  6 import android.content.Context;
  7 import android.graphics.Bitmap;
  8 import android.graphics.BitmapFactory;
  9 import android.graphics.Canvas;
 10 import android.graphics.Color;
 11 import android.graphics.Matrix;
 12 import android.graphics.Paint;
 13 import android.graphics.Rect;
 14 import android.graphics.Paint.Style;
 15 import android.media.ThumbnailUtils;
 16 import android.provider.MediaStore.Images.Thumbnails;
 17 import android.util.Log;
 18 import android.view.SurfaceHolder;
 19 import android.view.SurfaceView;
 20 import android.view.ViewGroup.LayoutParams;
 21 
 22 /**
 23  * 图片浏览器
 24  * @author Keynes Cao
 25  * @create 2011-12-5 上午9:24:23
 26  * @package com.farben.ams.widget
 27  */
 28 public class ImageSurfaceView  extends SurfaceView implements SurfaceHolder.Callback,Runnable{
 29 
 30     //图片集
 31     private List<String>         mList            =    null;
 32     //运行状态
 33     public     boolean             mLoop             =     false;
 34     //获取画布
 35     private SurfaceHolder         mSurfaceHolder     =     null;
 36     //图片索引
 37     private int                 mCount             =     0; 
 38     //时间间隔
 39     private long                 speed             =     1000;
 40     
 41     private static Matrix         matrix             =     new Matrix();
 42     /**
 43      * @param context
 44      * <see>容器</see>
 45      * @param list
 46      * <see>图片地址列表 </see>
 47      * @param rate
 48      * <see>图片切换时间　单位:毫秒</see>
 49      * 
 50      */
 51     public ImageSurfaceView(Context context,List<String>list,long speed) {
 52         super(context);
 53         if(list!=null && list.size()>0){
 54             this.mList = list;
 55             this.speed = speed;
 56         }
 57         mSurfaceHolder = getHolder();
 58         mSurfaceHolder.addCallback(this);
 59         mLoop = true;//开始画图
 60     }
 61 
 62     public void surfaceChanged(SurfaceHolder holder, int format, int width,    int height) {}
 63     //图像创建时
 64     public void surfaceCreated(SurfaceHolder holder) {
 65         if(mList!=null && mList.size()>0){
 66             if(mList.size() == 1){
 67                 Log.d("ImageSurfaceView"," Only one picture");
 68                 drawImg();
 69             }else{
 70                 Log.d("ImageSurfaceView"," run Thread.");
 71                 new Thread(this).start();
 72             }            
 73         }
 74         
 75     }
 76     //视图销毁时
 77     public void surfaceDestroyed(SurfaceHolder holder) {
 78         mLoop = false;
 79     }
 80     //画图方法
 81     private void drawImg(){
 82         Canvas canvas = mSurfaceHolder.lockCanvas();
 83         if(canvas == null || mSurfaceHolder == null){
 84             return;
 85         }
 86         if(mCount >= mList.size()){
 87             mCount = 0;
 88         }
 89         Bitmap bitmap  = null;
 90         try{
 91             String path = mList.get(mCount++);
 92             bitmap  = BitmapFactory.decodeStream(new FileInputStream(path));
 93             if(bitmap!=null){            
 94                 //画布宽和高
 95                 int height = getHeight();
 96                 int width  = getWidth();
 97                 //生成合适的图像
 98                 bitmap = getReduceBitmap(bitmap,width,height);
 99                 
100                 Paint paint = new Paint();            
101                 paint.setAntiAlias(true);
102                 paint.setStyle(Style.FILL);
103                 //清屏
104                 paint.setColor(Color.BLACK);
105                 canvas.drawRect(new Rect(0, 0, getWidth(),getHeight()), paint);        
106                 //Log.d("ImageSurfaceView_IMG",path);
107                 //画图
108                 canvas.drawBitmap(bitmap, matrix, paint);    
109             }
110             //解锁显示
111             mSurfaceHolder.unlockCanvasAndPost(canvas);                
112         }catch(Exception ex){
113             Log.e("ImageSurfaceView",ex.getMessage());
114             return;
115         }finally{
116             //资源回收
117             if(bitmap!=null){
118                 bitmap.recycle();
119             }
120         }        
121     }    
122     //刷新图片
123     public void run() {
124         while(mLoop){            
125             synchronized (mSurfaceHolder) {
126                 drawImg();
127             }
128             try {
129                 Thread.sleep(speed);
130             } catch (InterruptedException e) {
131                 Log.e("ImageSurfaceView_Thread",e.getMessage());
132             }
133         }
134         mList = null;//消毁
135     }
136     //缩放图片
137     private Bitmap getReduceBitmap(Bitmap bitmap ,int w,int h){
138         int     width     =     bitmap.getWidth();
139         int     hight     =     bitmap.getHeight();
140         Matrix     matrix     =     new Matrix();
141         float     wScake     =     ((float)w/width); 
142         float     hScake     =     ((float)h/hight);        
143         matrix.postScale(wScake, hScake);        
144         return Bitmap.createBitmap(bitmap, 0,0,width,hight,matrix,true);
145     }
146 
147 }