protected BitmapDrawable doInBackground()

in DisplayingBitmaps/Application/src/main/java/com/example/android/displayingbitmaps/util/ImageWorker.java [279:334]


        protected BitmapDrawable doInBackground(Void... params) {
            //BEGIN_INCLUDE(load_bitmap_in_background)
            if (BuildConfig.DEBUG) {
                Log.d(TAG, "doInBackground - starting work");
            }

            final String dataString = String.valueOf(mData);
            Bitmap bitmap = null;
            BitmapDrawable drawable = null;

            // Wait here if work is paused and the task is not cancelled
            synchronized (mPauseWorkLock) {
                while (mPauseWork && !isCancelled()) {
                    try {
                        mPauseWorkLock.wait();
                    } catch (InterruptedException e) {}
                }
            }

            // If the image cache is available and this task has not been cancelled by another
            // thread and the ImageView that was originally bound to this task is still bound back
            // to this task and our "exit early" flag is not set then try and fetch the bitmap from
            // the cache
            if (mImageCache != null && !isCancelled() && getAttachedImageView() != null
                    && !mExitTasksEarly) {
                bitmap = mImageCache.getBitmapFromDiskCache(dataString);
            }

            // If the bitmap was not found in the cache and this task has not been cancelled by
            // another thread and the ImageView that was originally bound to this task is still
            // bound back to this task and our "exit early" flag is not set, then call the main
            // process method (as implemented by a subclass)
            if (bitmap == null && !isCancelled() && getAttachedImageView() != null
                    && !mExitTasksEarly) {
                bitmap = processBitmap(mData);
            }

            // If the bitmap was processed and the image cache is available, then add the processed
            // bitmap to the cache for future use. Note we don't check if the task was cancelled
            // here, if it was, and the thread is still running, we may as well add the processed
            // bitmap to our cache as it might be used again in the future
            if (bitmap != null) {
                drawable = new BitmapDrawable(mResources, bitmap);

                if (mImageCache != null) {
                    mImageCache.addBitmapToCache(dataString, drawable);
                }
            }

            if (BuildConfig.DEBUG) {
                Log.d(TAG, "doInBackground - finished work");
            }

            return drawable;
            //END_INCLUDE(load_bitmap_in_background)
        }