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我在我的项目中使用缩略图加载器,下面提到了一个。问题是它会正确加载所有缩略图,除了大小约为40K的缩略图外。当我们的后端给出那种缩略图不会生成,有时这最终也会导致崩溃。Android缩略图加载问题
我该怎么处理这件事?
public class ThumbnailManager
{
private final Map<String, Bitmap> drawableMap;
public static Context context;
private Resources res;
private int thumbnail_size;
public ThumbnailManager()
{
drawableMap = new HashMap<String, Bitmap >();
res = new Resources(context.getAssets(), null, null);
thumbnail_size = res.getInteger(R.ThumbnailManager.THUMBNAIL_SIZE);
}
public Bitmap fetchBitmap(String urlString)
{
if(drawableMap.containsKey(urlString))
{
return (drawableMap.get(urlString));
}
//Log.d(getClass().getSimpleName(), " Image URL :: "+ urlString);
try
{
InputStream is = fetch(urlString);
android.util.Log.v("ThumbnailManager", "ThumbnailManager " + urlString);
drawableMap.put(urlString, BitmapFactory.decodeStream(is));//Bitmap.createScaledBitmap(BitmapFactory.decodeStream(is), thumbnail_size, thumbnail_size, false));
return drawableMap.get(urlString);
}
catch(Exception e)
{
android.util.Log.v("EXCEPTION", "EXCEPTION" + urlString);
return null;
}
}
public void fetchBitmapOnThread(final String urlString, final ImageView imageView)
{
if(drawableMap.containsKey(urlString))
{
imageView.setImageBitmap(drawableMap.get(urlString));
return;
}
if(urlString.compareTo("AUDIO") == 0)
{
Bitmap audioThumb = BitmapFactory.decodeResource(context.getResources(), R.drawable.timeline_audio_thumb);
drawableMap.put(urlString, Bitmap.createScaledBitmap(audioThumb, thumbnail_size, thumbnail_size, false));
imageView.setImageBitmap(drawableMap.get(urlString));
return;
}
final Handler handler = new Handler()
{
public void handleMessage(Message message)
{
imageView.setImageBitmap((Bitmap) message.obj);
}
};
Thread thread = new Thread()
{
public void run()
{
Bitmap urlBitmap = fetchBitmap(urlString);
Message message = handler.obtainMessage(1, urlBitmap);
handler.sendMessage(message);
}
};
thread.start();
}
public InputStream fetch(String urlString) throws IOException, MalformedURLException
{
final URL url = new URL(urlString);
final URLConnection conn = url.openConnection();
HttpURLConnection httpConn = (HttpURLConnection) conn;
httpConn.setAllowUserInteraction(true);
httpConn.setInstanceFollowRedirects(true);
httpConn.setRequestMethod("GET");
httpConn.connect();
return(conn.getInputStream());
}
}
在Eclipse中使用'adb logcat',DDMS或DDMS透视图来检查与您的“崩溃”相关的堆栈跟踪,因为这会告诉您哪里出了问题。 – CommonsWare
这是一个内存不足的例外,但我的问题是没有得到加载的40K缩略图...你能告诉我代码中的问题。 –