【发布时间】：2013-05-14 08:41:53
【问题描述】：
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();
}
}
LogCat：
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)
有人可以推荐吗？
【问题讨论】：
标签： android android-layout android-intent android-emulator android-listview