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Diffstat (limited to 'src/com/android/messaging/ui/photoviewer/BuglePhotoBitmapLoader.java')
| -rw-r--r-- | src/com/android/messaging/ui/photoviewer/BuglePhotoBitmapLoader.java | 192 |
1 files changed, 192 insertions, 0 deletions
diff --git a/src/com/android/messaging/ui/photoviewer/BuglePhotoBitmapLoader.java b/src/com/android/messaging/ui/photoviewer/BuglePhotoBitmapLoader.java new file mode 100644 index 0000000..d139a38 --- /dev/null +++ b/src/com/android/messaging/ui/photoviewer/BuglePhotoBitmapLoader.java @@ -0,0 +1,192 @@ +/* + * Copyright (C) 2015 The Android Open Source Project + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ +package com.android.messaging.ui.photoviewer; + +import android.content.Context; +import android.graphics.drawable.Drawable; +import android.net.Uri; +import android.support.rastermill.FrameSequenceDrawable; +import android.support.v4.content.AsyncTaskLoader; + +import com.android.ex.photo.PhotoViewController; +import com.android.ex.photo.loaders.PhotoBitmapLoaderInterface; +import com.android.ex.photo.loaders.PhotoBitmapLoaderInterface.BitmapResult; +import com.android.messaging.datamodel.media.ImageRequestDescriptor; +import com.android.messaging.datamodel.media.ImageResource; +import com.android.messaging.datamodel.media.MediaRequest; +import com.android.messaging.datamodel.media.MediaResourceManager; +import com.android.messaging.datamodel.media.UriImageRequestDescriptor; +import com.android.messaging.util.ImageUtils; + +/** + * Loader for the bitmap of a photo. + */ +public class BuglePhotoBitmapLoader extends AsyncTaskLoader<BitmapResult> + implements PhotoBitmapLoaderInterface { + private String mPhotoUri; + private ImageResource mImageResource; + // The drawable that is currently "in use" and being presented to the user. This drawable + // should never exist without the image resource backing it. + private Drawable mDrawable; + + public BuglePhotoBitmapLoader(Context context, String photoUri) { + super(context); + mPhotoUri = photoUri; + } + + @Override + public void setPhotoUri(String photoUri) { + mPhotoUri = photoUri; + } + + @Override + public BitmapResult loadInBackground() { + final BitmapResult result = new BitmapResult(); + final Context context = getContext(); + if (context != null && mPhotoUri != null) { + final ImageRequestDescriptor descriptor = + new UriImageRequestDescriptor(Uri.parse(mPhotoUri), + PhotoViewController.sMaxPhotoSize, PhotoViewController.sMaxPhotoSize, + true /* allowCompression */, false /* isStatic */, + false /* cropToCircle */, + ImageUtils.DEFAULT_CIRCLE_BACKGROUND_COLOR /* circleBackgroundColor */, + ImageUtils.DEFAULT_CIRCLE_STROKE_COLOR /* circleStrokeColor */); + final MediaRequest<ImageResource> imageRequest = + descriptor.buildSyncMediaRequest(context); + final ImageResource imageResource = + MediaResourceManager.get().requestMediaResourceSync(imageRequest); + if (imageResource != null) { + setImageResource(imageResource); + result.status = BitmapResult.STATUS_SUCCESS; + result.drawable = mImageResource.getDrawable(context.getResources()); + } else { + releaseImageResource(); + result.status = BitmapResult.STATUS_EXCEPTION; + } + } else { + result.status = BitmapResult.STATUS_EXCEPTION; + } + return result; + } + + /** + * Called when there is new data to deliver to the client. The super class will take care of + * delivering it; the implementation here just adds a little more logic. + */ + @Override + public void deliverResult(BitmapResult result) { + final Drawable drawable = result != null ? result.drawable : null; + if (isReset()) { + // An async query came in while the loader is stopped. We don't need the result. + releaseDrawable(drawable); + return; + } + + // We are now going to display this drawable so set to mDrawable + mDrawable = drawable; + + if (isStarted()) { + // If the Loader is currently started, we can immediately deliver its results. + super.deliverResult(result); + } + } + + /** + * Handles a request to start the Loader. + */ + @Override + protected void onStartLoading() { + if (mDrawable != null) { + // If we currently have a result available, deliver it + // immediately. + final BitmapResult result = new BitmapResult(); + result.status = BitmapResult.STATUS_SUCCESS; + result.drawable = mDrawable; + deliverResult(result); + } + + if (takeContentChanged() || (mImageResource == null)) { + // If the data has changed since the last time it was loaded + // or is not currently available, start a load. + forceLoad(); + } + } + + /** + * Handles a request to stop the Loader. + */ + @Override + protected void onStopLoading() { + // Attempt to cancel the current load task if possible. + cancelLoad(); + } + + /** + * Handles a request to cancel a load. + */ + @Override + public void onCanceled(BitmapResult result) { + super.onCanceled(result); + + // At this point we can release the resources associated with 'drawable' if needed. + if (result != null) { + releaseDrawable(result.drawable); + } + } + + /** + * Handles a request to completely reset the Loader. + */ + @Override + protected void onReset() { + super.onReset(); + + // Ensure the loader is stopped + onStopLoading(); + + releaseImageResource(); + } + + private void releaseDrawable(Drawable drawable) { + if (drawable != null && drawable instanceof FrameSequenceDrawable + && !((FrameSequenceDrawable) drawable).isDestroyed()) { + ((FrameSequenceDrawable) drawable).destroy(); + } + + } + + private void setImageResource(final ImageResource resource) { + if (mImageResource != resource) { + // Clear out any information for what is currently used + releaseImageResource(); + mImageResource = resource; + // No need to add ref since a ref is already reserved as a result of + // requestMediaResourceSync. + } + } + + private void releaseImageResource() { + // If we are getting rid of the imageResource backing the drawable, we must also + // destroy the drawable before releasing it. + releaseDrawable(mDrawable); + mDrawable = null; + + if (mImageResource != null) { + mImageResource.release(); + } + mImageResource = null; + } +}
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