Ho ViewPager che uso per mostrare immagini zoomabili (utilizzando ImageViewTouch). Ho bisogno di caricare bitmap di grandi dimensioni da Internet (http). Per grande intendo 2000x1000. Le immagini devono essere così grandi, perché sono zoomabili e devono mostrare i dettagli. Le immagini sul server sono in formato .jpg, ma non è un problema - posso cambiarlo.Caricamento di bitmap di grandi dimensioni su ImageView in ViewPager - esaurimento della memoria
Come posso caricare immagini di grandi dimensioni su ImageViewTouch (ImageView) senza ottenere i proble con la memoria?
Ormai sto usando semplicemente questo (AsyncTask):
ImageView currentView; //ImageView where to place image loaded from Internet
String ImageUrl; //URL of image to load
protected Bitmap doInBackground(ArrayList... params) {
Bitmap bitmap;
InputStream in = null;
imageUrl = (String)params[0].get(1);
try{
HttpClient httpclient = new DefaultHttpClient();
HttpResponse response = httpclient.execute(new HttpGet(imageUrl));
in = response.getEntity().getContent();
} catch(Exception e){
e.printStackTrace();
}
try {
bitmapa = BitmapFactory.decodeStream(in);
in.close();
} catch (IOException e1) {
e1.printStackTrace();
}
return bitmap;
}
@Override
protected void onPostExecute(Bitmap bitmap) {
currentView.setImageBitmap(bitmap);
}
Ed causare molti problemi con la memoria:
E/dalvikvm-heap(369): 69560740-byte external allocation too large for this process.
E/GraphicsJNI(369): VM won't let us allocate 69560740 bytes
o
E/AndroidRuntime(369): java.lang.RuntimeException: An error occured while executing doInBackground()
E/AndroidRuntime(369): at android.os.AsyncTask$3.done(AsyncTask.java:200)
E/AndroidRuntime(369): at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:274)
E/AndroidRuntime(369): at java.util.concurrent.FutureTask.setException(FutureTask.java:125)
E/AndroidRuntime(369): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:308)
E/AndroidRuntime(369): at java.util.concurrent.FutureTask.run(FutureTask.java:138)
E/AndroidRuntime(369): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1088)
E/AndroidRuntime(369): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:581)
E/AndroidRuntime(369): at java.lang.Thread.run(Thread.java:1019)
E/AndroidRuntime(369): Caused by: java.lang.OutOfMemoryError: bitmap size exceeds VM budget
E/AndroidRuntime(369): at android.graphics.BitmapFactory.nativeDecodeStream(Native Method)
E/AndroidRuntime(369): at android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:470)
E/AndroidRuntime(369): at android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:525)
E/AndroidRuntime(369): at com.package.app.ImageDownloader.doInBackground(ImageDownloader.java:78)
E/AndroidRuntime(369): at com.package.app.ImageDownloader.doInBackground(ImageDownloader.java:1)
E/AndroidRuntime(369): at android.os.AsyncTask$2.call(AsyncTask.java:185)
E/AndroidRuntime(369): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:306)
E/AndroidRuntime(369): ... 4 more
http: // StackOverflow. it/a/24135283/294884 – Fattie