使用Facebook的壁画加载一个位图 [英] Using Facebook's Fresco to load a bitmap
问题描述
我试图取代毕加索在我与壁画Android应用程序。但是我不确定如何简单地装载使用壁画位图。
I'm trying to replace Picasso in my android app with Fresco. However I am unsure of how to simply load a bitmap using Fresco.
随着毕加索我只想做到以下几点。
With Picasso I would just do the following.
Bitmap poster = Picasso.with(getActivity())
.load(url)
.resize(Utils.convertDpToPixel(WIDTH,HEIGHT))
.centerCrop()
.get();
我一直无法弄清楚如何创造这个壁画的位图。有任何想法吗?
I have been unable to figure out how to create a Bitmap with this Fresco. Any ideas?
推荐答案
由于壁画说:
如果您的请求管道是一个去codeD映像 - 一个Android位图,您可以利用我们的更容易使用的BaseBitmapDataSubscriber的:
If your request to the pipeline is for a decoded image - an Android Bitmap, you can take advantage of our easier-to-use BaseBitmapDataSubscriber:
dataSource.subscribe(new BaseBitmapDataSubscriber() {
@Override
public void onNewResultImpl(@Nullable Bitmap bitmap) {
// You can use the bitmap in only limited ways
// No need to do any cleanup.
}
@Override
public void onFailureImpl(DataSource dataSource) {
// No cleanup required here.
}
},
executor);
您不能分配的位图到任何变量不是在onNewResultImpl方法的范围。
You can not assign the bitmap to any variable not in the scope of the onNewResultImpl method.
http://frescolib.org/docs/datasources-datasubscribers.html#_
我的code:
public void setDataSubscriber(Context context, Uri uri, int width, int height){
DataSubscriber dataSubscriber = new BaseDataSubscriber<CloseableReference<CloseableBitmap>>() {
@Override
public void onNewResultImpl(
DataSource<CloseableReference<CloseableBitmap>> dataSource) {
if (!dataSource.isFinished()) {
return;
}
CloseableReference<CloseableBitmap> imageReference = dataSource.getResult();
if (imageReference != null) {
final CloseableReference<CloseableBitmap> closeableReference = imageReference.clone();
try {
CloseableBitmap closeableBitmap = closeableReference.get();
Bitmap bitmap = closeableBitmap.getUnderlyingBitmap();
if(bitmap != null && !bitmap.isRecycled()) {
//you can use bitmap here
}
} finally {
imageReference.close();
closeableReference.close();
}
}
}
@Override
public void onFailureImpl(DataSource dataSource) {
Throwable throwable = dataSource.getFailureCause();
// handle failure
}
};
getBitmap(context, uri, width, height, dataSubscriber);
}
/**
*
* @param context
* @param uri
* @param width
* @param height
* @param dataSubscriber
*/
public void getBitmap(Context context, Uri uri, int width, int height, DataSubscriber dataSubscriber){
ImagePipeline imagePipeline = Fresco.getImagePipeline();
ImageRequestBuilder builder = ImageRequestBuilder.newBuilderWithSource(uri);
if(width > 0 && height > 0){
builder.setResizeOptions(new ResizeOptions(width, height));
}
ImageRequest request = builder.build();
DataSource<CloseableReference<CloseableImage>>
dataSource = imagePipeline.fetchDecodedImage(request, context);
dataSource.subscribe(dataSubscriber, UiThreadExecutorService.getInstance());
}
这篇关于使用Facebook的壁画加载一个位图的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!