/*
* Copyright 2013 Google Inc.
*
* 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.google.android.apps.mytracks.util;
import com.google.android.apps.mytracks.services.tasks.BitmapLoader;
import android.net.Uri;
import android.widget.ImageView;
import java.lang.ref.WeakReference;
/**
* Utilities for photos.
*
* @author Jimmy Shih
*/
public class PhotoUtils {
private PhotoUtils() {}
/**
* Sets an image view.
*
* @param imageView the image view
* @param uri the image uri
* @param targetWidth the target width
* @param targetHeight the target height
* @param fitWithin true to fit within the target area in order to display the
* entire image (no cropping). False to fill the entire target area.
* (allow cropping).
*/
public static void setImageVew(
ImageView imageView, Uri uri, int targetWidth, int targetHeight, boolean fitWithin) {
if (cancelBitmapLoader(imageView, uri)) {
BitmapLoader bitmapLoader = new BitmapLoader(
imageView, uri, targetWidth, targetHeight, fitWithin);
WeakReference<BitmapLoader> bitmapLoaderReference = new WeakReference<BitmapLoader>(
bitmapLoader);
imageView.setTag(bitmapLoaderReference);
bitmapLoader.execute();
}
}
/**
* Gets the image view bitmap loader.
*
* @param imageView the image view
*/
public static BitmapLoader getBitmapLoader(ImageView imageView) {
if (imageView != null) {
Object object = imageView.getTag();
if (object instanceof WeakReference<?>) {
@SuppressWarnings("unchecked")
WeakReference<BitmapLoader> bitmapLoaderReference = (WeakReference<BitmapLoader>) object;
return bitmapLoaderReference.get();
}
}
return null;
}
/**
* Cancels the image view bitmap loader.
*
* @param imageView the image view
* @param uri the uri
* @return false if the bitmap loader shouldn't be canceled. True if there is
* no bitmap loader or the bitmap loader is cancelled.
*/
private static boolean cancelBitmapLoader(ImageView imageView, Uri uri) {
BitmapLoader bitmapLoaderAsyncTask = getBitmapLoader(imageView);
if (bitmapLoaderAsyncTask != null) {
if (bitmapLoaderAsyncTask.getUri().equals(uri)) {
// same bitmap loader is already in progress, don't cancel
return false;
} else {
// cancel previous bitmap loader
bitmapLoaderAsyncTask.cancel(true);
}
}
// imageview has no bitmap loader, or an existing bitmap loader is cancelled
return true;
}
}