?????. what ?
??????????????????? ??????????????????????????????? ????????????????. ?????????????????????????????. ???????????? ?????????????????????????????Щ???????? ?????ò?????. ???????????????????????????????? ?????????????????????. ????????????????????飬 ???Java???????????? ------ ???. ???????????????????????????????? ?????????????????????? ?????????????. ??????????????????? ?????????? ????????????????????????????? ????????. ?????????????з????????. ???????Щ???? ???????Щ???????. ???????????????н????????????????????????? ?????????????.
??????. why ?
?????????Android?????SPI????????????????????????????????????????????? ???????????δ????????? ????????????y??????? ??????y??. ??????д?????????????????? ?????????. ???????????? ??????鷳. ????????????????? ????????????????е????÷???????. ???????????????????????????? ?????о????:
????????????? ??????????.
??????????????? ????????????.
????????????????????????.
????????? ?????.
????......
??????. how ?
???????濴????????:
????(1) ??????
public interface ImageLoader {
/**
* ?????ImageLoader
* @param appContext ApplicatonContext
*/
void init(@NonNull Context appContext);
/**
* ????
* @param targetView
* @param uri
* @param listener
*/
void displayImage(@NonNull ImageView targetView?? @NonNull Uri uri?? @Nullable LoadListener listener);
/**
* ???????
* @param targetView
*/
void cancelDisplay(ImageView targetView);
/**
* ????ImageLoader?? ???????
*/
void destroy();
}
????(2) ????? (??????????????е?? ????????η?)
????FrescoImageLoader.java???:
class FrescoImageLoader implements ImageLoader {
private Context mAppContext;
@Override
public void init(@NonNull Context appContext) {
if(Fresco.hasBeenInitialized()) return;
// hold appContext
mAppContext = appContext;
// init fresco
OkHttpClient client = new OkHttpClient.Builder()
.addNetworkInterceptor(chain -> {
DevUtil.d("ImageLoader"?? "request-url: " + chain.request().url().toString());
return chain.proceed(chain.request());
})
.build();
ImagePipelineConfig config = OkHttpImagePipelineConfigFactory
.newBuilder(appContext?? client)
.build();
Fresco.initialize(appContext?? config);
}
@Override
public void displayImage(@NonNull ImageView targetView?? @NonNull Uri uri?? @Nullable LoadListener listener) {
// Fresco
if (targetView instanceof DraweeView) {
DraweeView realView = (DraweeView) targetView;
realView.setController(getDraweeController(realView?? uri?? listener));
return;
}
// Generic ImageView
targetView.setImageURI(uri);
}
private DraweeController getDraweeController(DraweeView targetView?? Uri uri?? LoadListener listener) {
DraweeController controller = Fresco.newDraweeControllerBuilder()
.setOldController(targetView.getController())
.setUri(uri)
.setControllerListener(listener == null ? null : new BaseControllerListener<ImageInfo>() {
@Override
public void onFailure(String id?? Throwable throwable) {
super.onFailure(id?? throwable);
if (listener != null) {
listener.onFailed(targetView);
}
}
@Override
public void onFinalImageSet(String id?? ImageInfo imageInfo?? Animatable animatable) {
super.onFinalImageSet(id?? imageInfo?? animatable);
if (imageInfo instanceof CloseableBitmap) {
CloseableBitmap image = (CloseableBitmap) imageInfo;
Bitmap resultBitmap = image.getUnderlyingBitmap();
if (listener != null) {
listener.onSuccess(targetView?? resultBitmap);
}
}
}
})
.build();
return controller;
}
@Override
public void cancelDisplay(ImageView targetView) {
}
@Override
public void destroy() {
Fresco.shutDown();
}
}
????UILImageLoader.java???
class UILImageLoader implements ImageLoader {
private com.nostra13.universalimageloader.core.ImageLoader mImpl;
@Override
public void init(@NonNull Context appContext) {
mImpl = com.nostra13.universalimageloader.core.ImageLoader.getInstance();
}
@Override
public void displayImage(@NonNull ImageView targetView?? @NonNull Uri uri?? @Nullable LoadListener listener) {
com.nostra13.universalimageloader.core.ImageLoader.getInstance().displayImage(uri.toString()?? targetView);
}
@Override
public void cancelDisplay(ImageView targetView) {
mImpl.cancelDisplayTask(targetView);
}
@Override
public void destroy() {
mImpl.destroy();
}
}
???????????................