这是我的初始问题:
我想在AutoScrollViewPager中展示几张图片。我使用Picasso来实现这一点。但是,我希望使用Rxjava2 + Picasso来完成相同的功能。我对RxJava的概念还比较陌生。如果有人能提供详细的帮助,将下面的代码转换为RxJava代码,我会非常感激。
这是我在onViewCreated()方法中所做的事情:
这是我的
但是不幸的是,这种方法并没有奏效,我最终遇到了以下错误:
我想在AutoScrollViewPager中展示几张图片。我使用Picasso来实现这一点。但是,我希望使用Rxjava2 + Picasso来完成相同的功能。我对RxJava的概念还比较陌生。如果有人能提供详细的帮助,将下面的代码转换为RxJava代码,我会非常感激。
这是我在onViewCreated()方法中所做的事情:
imageAdapter = new ImageAdapter(getActivity());
autoScrollViewPager.setAdapter(imageAdapter);
autoScrollViewPager.setCurrentItem(imageAdapter.getCount() - 1);
autoScrollViewPager.startAutoScroll();
autoScrollViewPager.setInterval(4000);
这是我的
ImageAdapter
。ImageAdapter(Context context){
this.context=context;
mLayoutInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
@Override
public int getCount() {
return GalImages.length;
}
@Override
public boolean isViewFromObject(View view, Object object) {
return view == ((RelativeLayout) object);
}
@Override
public Object instantiateItem(ViewGroup container, int position) {
LayoutInflater inflater = (LayoutInflater) container.getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View view = inflater.inflate(R.layout.pager_item,null);
((ViewPager) container).addView(view);
final ImageView img = (ImageView) view.findViewById(R.id.imageView);
Picasso.with(context)
.load(GalImages[position])
.fit()
.into(img);
return view;
}
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
container.removeView((RelativeLayout)object);
}
我该如何将这段代码转换成 RxJava 代码呢?感谢您的帮助。
以下是我的尝试:
我对我的 ImageAdapter
进行了一些修改:
@Override
public Object instantiateItem(ViewGroup container, int position) {
LayoutInflater inflater = (LayoutInflater) container.getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View view = inflater.inflate(R.layout.pager_item,null);
((ViewPager) container).addView(view);
img = (ImageView) view.findViewById(R.id.imageView);
loadImagesWithPicasso(position)
.subscribeOn(Schedulers.newThread())
.observeOn(AndroidSchedulers.mainThread())
.subscribe();
return view;
}
public Completable loadImagesWithPicasso(int position) {
return Completable.fromAction(new Action() {
@Override
public void run() throws Exception {
Picasso.with(context)
.load(GalImages[position])
.fit()
.into(new Target() {
@Override
public void onBitmapLoaded(Bitmap bitmap, Picasso.LoadedFrom from) {
}
@Override
public void onBitmapFailed(Drawable errorDrawable) {
}
@Override
public void onPrepareLoad(Drawable placeHolderDrawable) {
img.setImageDrawable(placeHolderDrawable);
}
});
}
});
}
但是不幸的是,这种方法并没有奏效,我最终遇到了以下错误:
java.lang.IllegalStateException: Method call should happen from the main thread.
at com.squareup.picasso.Utils.checkMain(Utils.java:136)
at com.squareup.picasso.RequestCreator.into(RequestCreator.java:496)
at com.kaaddevelopers.myprescriptor.ImageAdapter$1.run(ImageAdapter.java:79)
at io.reactivex.internal.operators.completable.CompletableFromAction.subscribeActual(CompletableFromAction.java:34)
at io.reactivex.Completable.subscribe(Completable.java:1613)
at io.reactivex.internal.operators.completable.CompletableSubscribeOn$SubscribeOnObserver.run(CompletableSubscribeOn.java:64)
at io.reactivex.Scheduler$1.run(Scheduler.java:134)
at io.reactivex.internal.schedulers.ScheduledRunnable.run(ScheduledRunnable.java:59)
at io.reactivex.internal.schedulers.ScheduledRunnable.call(ScheduledRunnable.java:51)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:269)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)
at java.lang.Thread.run(Thread.java:818)
非常感谢任何帮助。:)
.subscribeOn(Schedulers.newThread())
会发生什么?错误提示说“方法调用应该在主线程中进行”,但是你告诉你的代码在一个新线程上订阅。或者也许是.subscribeOn(AndroidSchedulers.mainThread())
,这可能是一样的... - JonasVautherin