毕加索+;RxJava2:方法调用应该从主线程进行
这是我最初的问题: 我正在尝试在毕加索+;RxJava2:方法调用应该从主线程进行,java,android,picasso,rx-java2,Java,Android,Picasso,Rx Java2,这是我最初的问题: 我正在尝试在AutoScrollViewPager中显示一些图像。我用毕加索来达到同样的目的。但是,我也希望使用Rxjava2+Picasso。我对这个RxJava概念有点陌生。因此,如果有人能在细节方面帮助我(如果可能的话),将下面的代码转换成RxJava代码,我将非常感激 这就是我在onViewCreated() imageAdapter = new ImageAdapter(getActivity()); autoScrollViewPager.setAdapter(i
AutoScrollViewPager
中显示一些图像。我用毕加索来达到同样的目的。但是,我也希望使用Rxjava2+Picasso。我对这个RxJava概念有点陌生。因此,如果有人能在细节方面帮助我(如果可能的话),将下面的代码转换成RxJava代码,我将非常感激
这就是我在onViewCreated()
imageAdapter = new ImageAdapter(getActivity());
autoScrollViewPager.setAdapter(imageAdapter);
autoScrollViewPager.setCurrentItem(imageAdapter.getCount() - 1);
autoScrollViewPager.startAutoScroll();
autoScrollViewPager.setInterval(4000);
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);
}
这是我的ImageAdapter
imageAdapter = new ImageAdapter(getActivity());
autoScrollViewPager.setAdapter(imageAdapter);
autoScrollViewPager.setCurrentItem(imageAdapter.getCount() - 1);
autoScrollViewPager.startAutoScroll();
autoScrollViewPager.setInterval(4000);
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);
}
如何将其转换为RxJava代码?任何帮助都将不胜感激
这就是我试图做的
我稍微更改了我的ImageAdapter
:
@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);
}
});
}
});
}
但不幸的是,这不起作用,我最终犯了这样一个错误:
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)
任何帮助都将不胜感激。:) 您正在从executor线程加载图像,这是毕加索不允许的(如果您问我,这是一个选择,有更好的方法来处理同步问题,但现在就是这样) 您可以查看此决定的详细信息: 毕加索的错误是允许外部调用程序调用主线程以外的into()。这些方法在不同步的情况下处理视图循环和取消,因此在毕加索2.3中我们添加了检查 你有几个选择。如果您将
Looper.getMainLooper()
传入,您可以在UI线程中执行整个实例化项
工作,或者您可以使用RequestCreator.get()
方法代替RequestCreator.into()
,或者将毕加索
工作包装为:
context.runOnUiThread(new Runnable() {
@Override
public void run() {
// Can call RequestCreator.into here
}
});
如果删除
.subscribeOn(Schedulers.newThread())
,该怎么办?错误表示“应该从主线程调用方法”,但您告诉代码订阅一个新线程。或者可能是.subscribeOn(AndroidSchedulers.mainThread())
,这可能是相同的…我最终使用get()而不是into(),into()返回位图,