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/*
* Copyright (C) 2011 Google Inc.
* Licensed to 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.ex.photo.loaders;
import android.content.AsyncTaskLoader;
import android.content.ContentResolver;
import android.content.Context;
import android.graphics.Bitmap;
import android.net.Uri;
import android.util.DisplayMetrics;
import com.android.ex.photo.fragments.PhotoViewFragment;
import com.android.ex.photo.util.ImageUtils;
/**
* Loader for the bitmap of a photo.
*/
public class PhotoBitmapLoader extends AsyncTaskLoader<Bitmap> {
private String mPhotoUri;
private Bitmap mBitmap;
public PhotoBitmapLoader(Context context, String photoUri) {
super(context);
mPhotoUri = photoUri;
}
public void setPhotoUri(String photoUri) {
mPhotoUri = photoUri;
}
@Override
public Bitmap loadInBackground() {
Context context = getContext();
if (context != null && mPhotoUri != null) {
final ContentResolver resolver = context.getContentResolver();
Bitmap bitmap = ImageUtils.createLocalBitmap(resolver, Uri.parse(mPhotoUri),
PhotoViewFragment.sPhotoSize);
bitmap.setDensity(DisplayMetrics.DENSITY_MEDIUM);
return bitmap;
}
return null;
}
/**
* 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(Bitmap bitmap) {
if (isReset()) {
// An async query came in while the loader is stopped. We
// don't need the result.
if (bitmap != null) {
onReleaseResources(bitmap);
}
}
Bitmap oldBitmap = mBitmap;
mBitmap = bitmap;
if (isStarted()) {
// If the Loader is currently started, we can immediately
// deliver its results.
super.deliverResult(bitmap);
}
// At this point we can release the resources associated with
// 'oldBitmap' if needed; now that the new result is delivered we
// know that it is no longer in use.
if (oldBitmap != null && oldBitmap != bitmap && !oldBitmap.isRecycled()) {
onReleaseResources(oldBitmap);
}
}
/**
* Handles a request to start the Loader.
*/
@Override
protected void onStartLoading() {
if (mBitmap != null) {
// If we currently have a result available, deliver it
// immediately.
deliverResult(mBitmap);
}
if (takeContentChanged() || mBitmap == 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(Bitmap bitmap) {
super.onCanceled(bitmap);
// At this point we can release the resources associated with 'bitmap'
// if needed.
onReleaseResources(bitmap);
}
/**
* Handles a request to completely reset the Loader.
*/
@Override
protected void onReset() {
super.onReset();
// Ensure the loader is stopped
onStopLoading();
// At this point we can release the resources associated with 'bitmap'
// if needed.
if (mBitmap != null) {
onReleaseResources(mBitmap);
mBitmap = null;
}
}
/**
* Helper function to take care of releasing resources associated
* with an actively loaded data set.
*/
protected void onReleaseResources(Bitmap bitmap) {
if (bitmap != null && !bitmap.isRecycled()) {
bitmap.recycle();
}
}
}
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