1

我正在从 Rss Xml 文件中读取 imageURL 并在列表视图中显示，我能够显示图像，但某些图像 URL 出现异常

java.io.FileNotFoundException

这是我的代码：

public class ImageLoader {

    MemoryCache memoryCache=new MemoryCache();
    FileCache fileCache;
    private Map<ImageView, String> imageViews=Collections.synchronizedMap(new WeakHashMap<ImageView, String>());
    ExecutorService executorService; 
    String type;
    public ImageLoader(Context context,String type){
        fileCache=new FileCache(context);
        executorService=Executors.newFixedThreadPool(5);
        this.type=type;
    } 

    public ImageLoader(Context context){
        fileCache=new FileCache(context);
        executorService=Executors.newFixedThreadPool(5);
    }    
    final int stub_id = R.drawable.toriimg;
    public void DisplayImage(String url, ImageView imageView)
    {
        //Log.d("ImageLoader","Iam in DisplayImage");
        imageViews.put(imageView, url);
        Bitmap bitmap=memoryCache.get(url);
        if(bitmap!=null)
            imageView.setImageBitmap(bitmap);
        else
        {
            queuePhoto(url, imageView);
            imageView.setImageResource(stub_id);           
        }
    }

    private void queuePhoto(String url, ImageView imageView)
    {
        PhotoToLoad p=new PhotoToLoad(url, imageView);
        executorService.submit(new PhotosLoader(p));
    }

    private Bitmap getBitmap(String url) 
    {
        File f=fileCache.getFile(url);

        //from SD cache
        Bitmap b = decodeFile(f);
        if(b!=null)
            return b;

        //from web
        try {
            Bitmap bitmap=null;
            URL imageUrl = new URL(url);
            HttpURLConnection conn = (HttpURLConnection)imageUrl.openConnection();
            conn.setConnectTimeout(30000);
            conn.setReadTimeout(30000);
            conn.setInstanceFollowRedirects(true);
            InputStream is=conn.getInputStream();
            OutputStream os = new FileOutputStream(f);
            Utils.CopyStream(is, os);
            os.close();
            bitmap = decodeFile(f);
            return bitmap;
        } catch (Exception ex){
           ex.printStackTrace();
           return null;
        }
    }

    //decodes image and scales it to reduce memory consumption
    private Bitmap decodeFile(File f){
        try {
            //decode image size
            BitmapFactory.Options o = new BitmapFactory.Options();
            o.inJustDecodeBounds = true;
            BitmapFactory.decodeStream(new FileInputStream(f),null,o);
            //Find the correct scale value. It should be the power of 2.
           int REQUIRED_SIZE=70;
            int width_tmp=o.outWidth, height_tmp=o.outHeight;
            int scale=1;
            if(this.type=="SongPlayActivity")
            {

                scale=1;

            }
            else if(this.type=="AlbumPlayListActivity")
            {


                scale=1;
            }
            else
            {

            while(true){
                if(width_tmp/2<REQUIRED_SIZE || height_tmp/2<REQUIRED_SIZE)
                    break;
                width_tmp/=2;
                height_tmp/=2;
                scale*=2;
            }
            }
            //decode with inSampleSize
            BitmapFactory.Options o2 = new BitmapFactory.Options();
            o2.inSampleSize=scale;
            return BitmapFactory.decodeStream(new FileInputStream(f), null, o2);
        } catch (FileNotFoundException e) {}
        return null;
    }

    //Task for the queue
    private class PhotoToLoad
    {
        public String url;
        public ImageView imageView;
        public PhotoToLoad(String u, ImageView i){
            url=u; 
            imageView=i;
        }
    }

    class PhotosLoader implements Runnable {
        PhotoToLoad photoToLoad;
        PhotosLoader(PhotoToLoad photoToLoad){
            this.photoToLoad=photoToLoad;
        }

        public void run() {
            if(imageViewReused(photoToLoad))
                return;
            Bitmap bmp=getBitmap(photoToLoad.url);
            memoryCache.put(photoToLoad.url, bmp);
            if(imageViewReused(photoToLoad))
                return;
            BitmapDisplayer bd=new BitmapDisplayer(bmp, photoToLoad);
            Activity a=(Activity)photoToLoad.imageView.getContext();
            a.runOnUiThread(bd);
        }
    }

    boolean imageViewReused(PhotoToLoad photoToLoad){
        String tag=imageViews.get(photoToLoad.imageView);
        if(tag==null || !tag.equals(photoToLoad.url))
            return true;
        return false;
    }

    //Used to display bitmap in the UI thread
    class BitmapDisplayer implements Runnable
    {
        Bitmap bitmap;
        PhotoToLoad photoToLoad;
        public BitmapDisplayer(Bitmap b, PhotoToLoad p){bitmap=b;photoToLoad=p;}
        public void run()
        {
            if(imageViewReused(photoToLoad))
                return;
            if(bitmap!=null)
                photoToLoad.imageView.setImageBitmap(bitmap);
            else
                photoToLoad.imageView.setImageResource(stub_id);
        }
    }

    public void clearCache() {
        memoryCache.clear();
        fileCache.clear();
    }

}

日志猫：

05-14 13:00:09.640: W/System.err(11295): java.io.FileNotFoundException: http://www.toucheradio.com/hostphotos/kiran Abbaraju.jpg
05-14 13:00:09.640: W/System.err(11295):    at org.apache.harmony.luni.internal.net.www.protocol.http.HttpURLConnectionImpl.getInputStream(HttpURLConnectionImpl.java:521)
05-14 13:00:09.640: W/System.err(11295):    at com.teluguone.torilt.model.ImageLoader.getBitmap(ImageLoader.java:89)
05-14 13:00:09.640: W/System.err(11295):    at com.teluguone.torilt.model.ImageLoader.access$0(ImageLoader.java:72)
05-14 13:00:09.640: W/System.err(11295):    at com.teluguone.torilt.model.ImageLoader$PhotosLoader.run(ImageLoader.java:163)
05-14 13:00:09.640: W/System.err(11295):    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:444)
05-14 13:00:09.640: W/System.err(11295):    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:306)
05-14 13:00:09.640: W/System.err(11295):    at java.util.concurrent.FutureTask.run(FutureTask.java:138)
05-14 13:00:09.640: W/System.err(11295):    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1088)
05-14 13:00:09.640: W/System.err(11295):    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:581)
05-14 13:00:09.640: W/System.err(11295):    at java.lang.Thread.run(Thread.java:1019)

有人可以建议吗？

4

6 回答 6

3

如日志：

FileNotFoundException：http ://www.toucheradio.com/hostphotos/kiran Abbaraju.jpg

您在 url 中传递带有图像名称的空间，(kiran Abbaraju.jpg)因此URLEncoder.encode在从 url 请求图像之前用于对其进行编码：

String img_url="http://www.toucheradio.com/hostphotos/kiran Abbaraju.jpg";
String finalimageurl = URLEncoder.encode(your_img_url,"UTF-8");
于 2013-05-14T08:44:48.943 回答
2

正如我在其中一条评论中所说，如果您对“http://”进行编码，您将得到“http%3A%2F%2F”。URLEncoder.encode 方法用于编码查询字符串值而不是整个 URL。

因此，一种解决方案可以是：

String query = URLEncoder.encode("kiran Abbaraju.jpg", "utf-8");
String url = "http://www.toucheradio.com/hostphotos/" + query;

但更清洁的解决方案是：

String wrongUrl = "http://www.toucheradio.com/hostphotos/kiran Abbaraju.jpg";
URL url = new URL(wrongUrl);
URI uri = new URI(url.getProtocol(), url.getUserInfo(), url.getHost(), url.getPort(), url.getPath(), url.getQuery(), url.getRef());
url = uri.toURL();

更新：

在你的 getBitmap(String url) 尝试：

...
//from web
    try {
        Bitmap bitmap=null;
        URL imageUrl = new URL(url);
        URI uri = new URI(imageUrl.getProtocol(), imageUrl.getUserInfo(), imageUrl.getHost(), imageUrl.getPort(), imageUrl.getPath(), imageUrl.getQuery(), imageUrl.getRef());
        imageUrl = uri.toURL();
...
于 2013-05-14T22:58:16.337 回答
1

在您的getBitmap中，您需要先使用对 url 进行编码，URLEncoder然后再尝试使用打开它getFile

private Bitmap getBitmap(String url) 
{
    File f=fileCache.getFile(url);
    ....
}
于 2013-05-14T08:45:22.143 回答
1

请使用通用图片加载器，这是从 url 加载图片的更好方法，它将处理所有异常和问题，

对于第一次从 xml 读取图像链接，然后在适配器中使用通用图像加载器

https://github.com/nostra13/Android-Universal-Image-Loader

https://stackoverflow.com/a/16557816/1911784

于 2013-05-15T08:44:30.090 回答
1

在您项目的适配器中...使用此代码：

@Override
    public View getView(int position, View convertView, ViewGroup parent) 
    {

        ViewHolder holder;
        if(convertView==null){
            holder = new ViewHolder();
            LayoutInflater inflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            convertView = inflater.inflate(R.layout.row_layout, null);
            holder.tv_ResName = (TextView)convertView.findViewById(R.id.tvResName);
            holder.imgLogo = (ImageView)convertView.findViewById(R.id.imgID);
            convertView.setTag(holder);
        }
        else{
            holder = (ViewHolder)convertView.getTag();
        }

        holder.tv_ResName.setText(ParseRestaurant.resStorage.get(position).getResName());
        String url_val=ParseRestaurant.resStorage.get(position).getResLogo();//This is the Url you are getting from JSON parsing
        URL url;
          Bitmap  bmImg;
        try {
            url = new URL(url_val);
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            conn.setDoInput(true);
            conn.connect();
            InputStream is = conn.getInputStream();
             bmImg = BitmapFactory.decodeStream(is);
             holder.imgLogo.setImageBitmap(bmImg); //Here u will set image in imageview
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        return convertView;
    }
于 2013-07-18T06:47:58.990 回答
1

或者你可以这样做：

  private Bitmap getBitmap(String url) 
            {
                url = url.replaceAll(" ", "%20");
                File f=fileCache.getFile(url);
               .....YOUR CODE
于 2013-05-14T08:49:03.123 回答