Android 致命异常:异步任务#2
我有3个按钮和一个图库。在我的图库中,我有3个ImageAdapters,一个用于单击每个按钮,我设置了一个缩略图URL,该URL必须获取并加载到这些ImageAdapters,我使用AsyncTask进行此操作 代码: 应用程序启动正常,但有时会抛出以下错误: 01-21 15:16:23.750:E/AndroidRuntime(8292):致命异常:AsyncTask#2 01-21 15:16:23.750:E/AndroidRuntime(8292):位于java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273) 01-21 15:16:23.750:E/AndroidRuntime(8292):在java.util.concurrent.FutureTask.setException(FutureTask.java:124) 01-21 15:16:23.750:E/AndroidRuntime(8292):在java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307) 01-21 15:16:23.750:E/AndroidRuntime(8292):在java.util.concurrent.FutureTask.run(FutureTask.java:137) 01-21 15:16:23.750:E/AndroidRuntime(8292):位于java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)Android 致命异常:异步任务#2,android,android-asynctask,Android,Android Asynctask,我有3个按钮和一个图库。在我的图库中,我有3个ImageAdapters,一个用于单击每个按钮,我设置了一个缩略图URL,该URL必须获取并加载到这些ImageAdapters,我使用AsyncTask进行此操作 代码: 应用程序启动正常,但有时会抛出以下错误: 01-21 15:16:23.750:E/AndroidRuntime(8292):致命异常:AsyncTask#2 01-21 15:16:23.750:E/AndroidRuntime(8292):位于java.util.concu
出现这种情况的可能原因是什么?我如何解决它?您是否有可能捕获到一个异常,但在捕获{}中又捕获到另一个异常?因为它位于不同的(非UI)线程上,所以不要尝试使用Toast来通知自己错误。您是否有可能捕获到一个异常,但在捕获{}中又捕获到另一个异常?因为它位于不同的(非UI)线程上,所以不要尝试使用Toast来通知自己错误。您可以尝试仅在更新的适配器上调用notifyDataSetChanged(),看看这是否是问题所在。。您的意思是说我需要在
onPostExecute
方法中调用notifyDataSetChanged()
,我的意思是向onPostExecute()方法传递一个整数或其他信息,以了解哪个适配器已更新,并仅更新该特定适配器。您可以尝试仅在更新的适配器上调用notifyDataSetChanged(),看看这是否是问题。您的意思是说我需要调用notifyDataSetChanged()
在onPostExecute
方法中?不,我的意思是向onPostExecute()方法传递一个整数或其他信息,以了解更新了哪个适配器,并仅更新该特定适配器
class AddImageTask extends AsyncTask<Void, Void, Void> {
@Override
protected Void doInBackground(Void... unused) {
try {
for (String url : PhotoURLS) {
String filename = url.substring(url.lastIndexOf("/") +
1,url.length());
filename = "" + filename;
String thumburl = url.substring(0, url.lastIndexOf("/") + 1);
imageAdapter.addItem(LoadThumbnailFromURL(thumburl+ filename));
publishProgress();
}
for (String url : AudioThumbURLS) {
String filename = url.substring(url.lastIndexOf("/") +
1,url.length());
filename = "" + filename;
String thumburl = url.substring(0, url.lastIndexOf("/") + 1);
imageAdapter1.addItem(LoadThumbnailFromURL(thumburl+ filename));
publishProgress();
}
for (String url : VideoThumbURLS) {
String filename = url.substring(url.lastIndexOf("/") +
1,url.length());
filename = "" + filename;
String thumburl = url.substring(0, url.lastIndexOf("/") + 1);
imageAdapter2.addItem(LoadThumbnailFromURL(thumburl+ filename));
publishProgress();
}
} catch (Exception ae) {
ae.printStackTrace();
Toast.makeText(getApplicationContext(),"Error found in the application",
Toast.LENGTH_LONG).show();
}
return (null);
}
@Override
protected void onProgressUpdate(Void... unused) {
imageAdapter.notifyDataSetChanged();
imageAdapter1.notifyDataSetChanged();
imageAdapter2.notifyDataSetChanged();
}
@Override
protected void onPostExecute(Void unused) {
}
}
private Drawable LoadThumbnailFromURL(String url) {
try {
URLConnection connection = new URL(url).openConnection();
String contentType = connection.getHeaderField("Content-Type");
boolean isImage = contentType.startsWith("");
if (isImage) {
HttpGet httpRequest = new HttpGet(url);
HttpClient httpclient = new DefaultHttpClient();
HttpResponse response = (HttpResponse) httpclient
.execute(httpRequest);
HttpEntity entity = response.getEntity();
BufferedHttpEntity bufferedHttpEntity = new BufferedHttpEntity(
entity);
InputStream is = bufferedHttpEntity.getContent();
Drawable d = Drawable.createFromStream(is, "src name");
return d;
} else {
Bitmap b = BitmapFactory.decodeResource(getResources(),
R.drawable.icon);
Drawable d = new BitmapDrawable(b);
return d;
}
} catch (Exception e) {
Toast.makeText(getApplicationContext(), "error", Toast.LENGTH_LONG)
.show();
Log.e(e.getClass().getName(), e.getMessage(), e);
}
return null;
}