Cancel load task when fragment becomes invisible (fixes crash in rotations)

diff --git a/src/com/owncloud/android/ui/preview/PreviewImageFragment.java b/src/com/owncloud/android/ui/preview/PreviewImageFragment.java
index 505a326..0995793 100644 (file)
--- a/src/com/owncloud/android/ui/preview/PreviewImageFragment.java
+++ b/src/com/owncloud/android/ui/preview/PreviewImageFragment.java
@@ -83,6 +83,8 @@ public class PreviewImageFragment extends FileFragment {
     private static final String TAG = PreviewImageFragment.class.getSimpleName();
 
     private boolean mIgnoreFirstSavedState;
     private static final String TAG = PreviewImageFragment.class.getSimpleName();
 
     private boolean mIgnoreFirstSavedState;

+    
+    private LoadBitmapTask mLoadBitmapTask = null;

 
     
     /**
 
     
     /**


@@ -191,12 +193,22 @@ public class PreviewImageFragment extends FileFragment {
     public void onStart() {
         super.onStart();
         if (getFile() != null) {
     public void onStart() {
         super.onStart();
         if (getFile() != null) {

-           BitmapLoader bl = new BitmapLoader(mImageView, mMessageView, mProgressWheel);
-           bl.execute(new String[]{getFile().getStoragePath()});
+           mLoadBitmapTask = new LoadBitmapTask(mImageView, mMessageView, mProgressWheel);
+           mLoadBitmapTask.execute(new String[]{getFile().getStoragePath()});

         }
     }
     
     
         }
     }
     
     

+    @Override
+    public void onStop() {
+        super.onStop();
+        if (mLoadBitmapTask != null) {
+            mLoadBitmapTask.cancel(true);
+            mLoadBitmapTask = null;
+        }
+        
+    }
+    

     /**
      * {@inheritDoc}
      */
     /**
      * {@inheritDoc}
      */


@@ -330,7 +342,7 @@ public class PreviewImageFragment extends FileFragment {
     }
     
     
     }
     
     

-    private class BitmapLoader extends AsyncTask<String, Void, Bitmap> {
+    private class LoadBitmapTask extends AsyncTask<String, Void, Bitmap> {

 
         /**
          * Weak reference to the target {@link ImageView} where the bitmap will be loaded into.
 
         /**
          * Weak reference to the target {@link ImageView} where the bitmap will be loaded into.


@@ -366,7 +378,7 @@ public class PreviewImageFragment extends FileFragment {
          * 
          * @param imageView     Target {@link ImageView} where the bitmap will be loaded into.
          */
          * 
          * @param imageView     Target {@link ImageView} where the bitmap will be loaded into.
          */

-        public BitmapLoader(ImageViewCustom imageView, TextView messageView, ProgressBar progressWheel) {
+        public LoadBitmapTask(ImageViewCustom imageView, TextView messageView, ProgressBar progressWheel) {

             mImageViewRef = new WeakReference<ImageViewCustom>(imageView);
             mMessageViewRef = new WeakReference<TextView>(messageView);
             mProgressWheelRef = new WeakReference<ProgressBar>(progressWheel);
             mImageViewRef = new WeakReference<ImageViewCustom>(imageView);
             mMessageViewRef = new WeakReference<TextView>(messageView);
             mProgressWheelRef = new WeakReference<ProgressBar>(progressWheel);


@@ -380,6 +392,8 @@ public class PreviewImageFragment extends FileFragment {
             String storagePath = params[0];
             try {
 
             String storagePath = params[0];
             try {
 

+                if (isCancelled()) return result;
+                

                 File picture = new File(storagePath);
 
                 if (picture != null) {
                 File picture = new File(storagePath);
 
                 if (picture != null) {


@@ -389,6 +403,8 @@ public class PreviewImageFragment extends FileFragment {
                             (new BufferedInputStream(new FileInputStream(picture))));
                 }
 
                             (new BufferedInputStream(new FileInputStream(picture))));
                 }
 

+                if (isCancelled()) return result;
+                

                 if (result == null) {
                     mErrorMessageId = R.string.preview_image_error_unknown_format;
                     Log_OC.e(TAG, "File could not be loaded as a bitmap: " + storagePath);
                 if (result == null) {
                     mErrorMessageId = R.string.preview_image_error_unknown_format;
                     Log_OC.e(TAG, "File could not be loaded as a bitmap: " + storagePath);


@@ -400,6 +416,8 @@ public class PreviewImageFragment extends FileFragment {
             } catch (OutOfMemoryError e) {
                 Log_OC.e(TAG, "Out of memory occured for file " + storagePath, e);
 
             } catch (OutOfMemoryError e) {
                 Log_OC.e(TAG, "Out of memory occured for file " + storagePath, e);
 

+                if (isCancelled()) return result;
+                

                 // If out of memory error when loading or rotating image, try to load it scaled
                 result = loadScaledImage(storagePath);
 
                 // If out of memory error when loading or rotating image, try to load it scaled
                 result = loadScaledImage(storagePath);
 


@@ -426,6 +444,13 @@ public class PreviewImageFragment extends FileFragment {
         }
         
         @Override
         }
         
         @Override

+        protected void onCancelled(Bitmap result) {
+            if (result != null) {
+                result.recycle();
+            }
+        }
+
+        @Override

         protected void onPostExecute(Bitmap result) {
             hideProgressWheel();
             if (result != null) {
         protected void onPostExecute(Bitmap result) {
             hideProgressWheel();
             if (result != null) {


@@ -434,7 +459,7 @@ public class PreviewImageFragment extends FileFragment {
                 showErrorMessage();
             }
         }
                 showErrorMessage();
             }
         }

-
+        

         @SuppressLint("InlinedApi")
         private void showLoadedImage(Bitmap result) {
             if (mImageViewRef != null) {
         @SuppressLint("InlinedApi")
         private void showLoadedImage(Bitmap result) {
             if (mImageViewRef != null) {