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У меня возникает некоторая проблема при загрузке изображений с сервера и показе в ListView с использованием AsyncTask в Android.Ошибка (android.os.NetworkOnMainThreadException) при загрузке изображений с сервера, отображаемого в ListView с использованием AsyncTask
Это показывает мне ошибку в том, что загрузка изображений в основном потоке (UI) Но я использую AsyncTask для этой цели.
Вот мой код MainActivity.java.
public class MainActivity extends AppCompatActivity {
private String[] imageURLArray = new String[]{
"http://farm8.staticflickr.com/7315/9046944633_881f24c4fa_s.jpg",
"http://farm4.staticflickr.com/3777/9049174610_bf51be8a07_s.jpg",
"http://farm8.staticflickr.com/7324/9046946887_d96a28376c_s.jpg",
"http://farm3.staticflickr.com/2828/9046946983_923887b17d_s.jpg",
"http://farm4.staticflickr.com/3810/9046947167_3a51fffa0b_s.jpg",
"http://farm4.staticflickr.com/3773/9049175264_b0ea30fa75_s.jpg",
"http://farm4.staticflickr.com/3781/9046945893_f27db35c7e_s.jpg",
"http://farm6.staticflickr.com/5344/9049177018_4621cb63db_s.jpg",
"http://farm8.staticflickr.com/7307/9046947621_67e0394f7b_s.jpg",
"http://farm6.staticflickr.com/5457/9046948185_3be564ac10_s.jpg",
"http://farm4.staticflickr.com/3752/9046946459_a41fbfe614_s.jpg",
"http://farm8.staticflickr.com/7403/9046946715_85f13b91e5_s.jpg",
"http://farm8.staticflickr.com/7315/9046944633_881f24c4fa_s.jpg",
"http://farm4.staticflickr.com/3777/9049174610_bf51be8a07_s.jpg",
"http://farm8.staticflickr.com/7324/9046946887_d96a28376c_s.jpg",
"http://farm3.staticflickr.com/2828/9046946983_923887b17d_s.jpg",
"http://farm4.staticflickr.com/3810/9046947167_3a51fffa0b_s.jpg",
"http://farm4.staticflickr.com/3773/9049175264_b0ea30fa75_s.jpg",
"http://farm4.staticflickr.com/3781/9046945893_f27db35c7e_s.jpg",
"http://farm6.staticflickr.com/5344/9049177018_4621cb63db_s.jpg",
"http://farm8.staticflickr.com/7307/9046947621_67e0394f7b_s.jpg",
"http://farm6.staticflickr.com/5457/9046948185_3be564ac10_s.jpg",
"http://farm4.staticflickr.com/3752/9046946459_a41fbfe614_s.jpg",
"http://farm8.staticflickr.com/7403/9046946715_85f13b91e5_s.jpg"};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ListView listView = (ListView)this.findViewById(R.id.listView);
ImageAdapter imageAdapter = new ImageAdapter(this, R.layout.imageitem, imageURLArray);
listView.setAdapter(imageAdapter);
}
}
Вот мой код ImageAdapter.java.
public class ImageAdapter extends ArrayAdapter<String> {
private String[] imageURLArray;
private LayoutInflater inflater;
public ImageAdapter(Context context, int textViewResourceId,
String[] imageArray) {
super(context, textViewResourceId, imageArray);
// TODO Auto-generated constructor stub
inflater = ((Activity) context).getLayoutInflater();
imageURLArray = imageArray;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
ViewHolder viewHolder = null;
if (convertView == null) {
convertView = inflater.inflate(R.layout.imageitem, null);
viewHolder = new ViewHolder();
viewHolder.imageView = (ImageView) convertView.findViewById(R.id.testImage);
convertView.setTag(viewHolder);
}
viewHolder = (ViewHolder) convertView.getTag();
Bitmap imageBitmap = null;
try {
URL imageURL = new URL(imageURLArray[position]);
imageBitmap = BitmapFactory.decodeStream(imageURL.openStream());
viewHolder.imageView.setImageBitmap(imageBitmap);
} catch (IOException e) {
// TODO: handle exception
Log.e("error", "Downloading Image Failed");
viewHolder.imageView.setImageResource(R.mipmap.ic_launcher);
}
return convertView;
}
private static class ViewHolder {
Bitmap bitmap;
String imageURL;
ImageView imageView;
}
private class DownloadAsyncTask extends AsyncTask<ViewHolder, Void, ViewHolder> {
@Override
protected ViewHolder doInBackground(ViewHolder... params) {
// TODO Auto-generated method stub
//load image directly
ViewHolder viewHolder = params[0];
try {
URL imageURL = new URL(viewHolder.imageURL);
viewHolder.bitmap = BitmapFactory.decodeStream(imageURL.openStream());
} catch (IOException e) {
// TODO: handle exception
Log.e("error", "Downloading Image Failed");
viewHolder.bitmap = null;
}
return viewHolder;
}
@Override
protected void onPostExecute(ViewHolder result) {
if (result.bitmap == null) {
result.imageView.setImageResource(R.mipmap.ic_launcher);
} else {
result.imageView.setImageBitmap(result.bitmap);
}
}
}
}
Вот ссылка, в которой есть полный проект.
http://www.mediafire.com/download/70pxv6ib584x9j7/DownloadImagesInListView.rar
Вот стек ошибка, которая показывает.
09-29 18:33:37.859 5550-5550/com.example.android.downloadimagesinlistview E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.example.android.downloadimagesinlistview, PID: 5550
android.os.NetworkOnMainThreadException
at
android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1161)
at java.net.InetAddress.lookupHostByName(InetAddress.java:418)
at java.net.InetAddress.getAllByNameImpl(InetAddress.java:252)
at java.net.InetAddress.getAllByName(InetAddress.java:215)
at com.android.okhttp.HostResolver$1.getAllByName(HostResolver.java:29)
at com.android.okhttp.internal.http.RouteSelector.resetNextInetSocketAddress(RouteSelector.java:232)
at com.android.okhttp.internal.http.RouteSelector.next(RouteSelector.java:124)
at com.android.okhttp.internal.http.HttpEngine.connect(HttpEngine.java:272)
at com.android.okhttp.internal.http.HttpEngine.sendRequest(HttpEngine.java:211)
at com.android.okhttp.internal.http.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:382)
at com.android.okhttp.internal.http.HttpURLConnectionImpl.getResponse(HttpURLConnectionImpl.java:332)
at com.android.okhttp.internal.http.HttpURLConnectionImpl.getInputStream(HttpURLConnectionImpl.java:199)
at java.net.URL.openStream(URL.java:470)
at com.example.android.downloadimagesinlistview.ImageAdapter.getView(ImageAdapter.java:48)
at android.widget.AbsListView.obtainView(AbsListView.java:2347)
at android.widget.ListView.makeAndAddView(ListView.java:1864)
at android.widget.ListView.fillDown(ListView.java:698)
at android.widget.ListView.fillFromTop(ListView.java:759)
at android.widget.ListView.layoutChildren(ListView.java:1673)
at android.widget.AbsListView.onLayout(AbsListView.java:2151)
at android.view.View.layout(View.java:15689)
at android.view.ViewGroup.layout(ViewGroup.java:5040)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1703)
at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1557)
at android.widget.LinearLayout.onLayout(LinearLayout.java:1466)
at android.view.View.layout(View.java:15689)
at android.view.ViewGroup.layout(ViewGroup.java:5040)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:579)
at android.widget.FrameLayout.onLayout(FrameLayout.java:514)
at android.view.View.layout(View.java:15689)
at android.view.ViewGroup.layout(ViewGroup.java:5040)
at android.support.v7.internal.widget.ActionBarOverlayLayout.onLayout(ActionBarOverlayLayout.java:437)
at android.view.View.layout(View.java:15689)
at android.view.ViewGroup.layout(ViewGroup.java:5040)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:579)
at android.widget.FrameLayout.onLayout(FrameLayout.java:514)
at android.view.View.layout(View.java:15689)
at android.view.ViewGroup.layout(ViewGroup.java:5040)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1703)
at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1557)
at android.widget.LinearLayout.onLayout(LinearLayout.java:1466)
at android.view.View.layout(View.java:15689)
at android.view.ViewGroup.layout(ViewGroup.java:5040)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:579)
at android.widget.FrameLayout.onLayout(FrameLayout.java:514)
at android.view.View.layout(View.java:15689)
at android.view.ViewGroup.layout(ViewGroup.java:5040)
at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2116)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1873)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1084)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5990)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:767)
at android.view.Choreographer.doCallbacks(Choreographer.java:580)
at android.view.Choreographer.doFrame(Choreographer.java:550)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:753)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5343)
at java.lang.reflect.Method.invoke(
Ожидаете ли вы нам загрузить проект? Пожалуйста, напишите сообщение [MCVE] (http://stackoverflow.com/help/mcve) –
вздохом. Просто за кодом вашего кода с асинхронным. Люди shoulnt должны быть вынуждены загружать тенистые .rars – poss
Ваш «ImageAdapter» (предположительно, некоторая форма «ListAdapter») в своем методе 'getView()' передает URL-адрес во что-то (возможно, «ImageView»), которое пытается скачайте все, что есть. – CommonsWare