我在后台显示DialogFragment
并加载数据。我希望显示对话框,数据不断加载并逐步更新已经显示的对话框。RXJava和DialogFragment =>对话框等待可观察 - 为什么?
问题
该对话框可观察完成之前未示出。为什么?
代码
private final static Handler mHandler = new Handler();
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
Observable<List<Data>> observable = Observable.create(new Observable.OnSubscribe<Data>()
{
@Override
public void call(Subscriber<? super Data> subscriber)
{
// iterate and create data
for (int i = resolveInfo.size() - 1; i >= 0; i--)
{
Data d = ...;
subscriber.onNext(d);
}
subscriber.onCompleted();
}
})
.onBackpressureBuffer()
.buffer(150, TimeUnit.MILLISECONDS)
.filter(new Func1<List<Data>, Boolean>()
{
@Override
public Boolean call(List<Data> rxSingleDatas)
{
return rxSingleDatas.size() > 0; // only deliver not emtpy lists!
}
})
.onBackpressureBuffer()
.doOnNext(new Action1<List<Data>>()
{
@Override
public void call(List<Data> shareDatas)
{
// add result to list + notify adapter
for (int i = 0; i < shareDatas.size(); i++)
mData.add(shareData);
if (mAdapter != null)
mAdapter.notifyDataSetChanged();
}
})
.doOnCompleted(new Action0()
{
@Override
public void call()
{
// flag to indicate all data is loaded
mReady = true;
}
});
// subscribe on handler thread for async execution
// observe on main thread for updating UI
mSubscription = observable
.subscribeOn(HandlerScheduler.from(mHandler))
.observeOn(AndroidSchedulers.mainThread())
.subscribe();
}
@Override
public void onDestroy()
{
if (mSubscription != null)
mSubscription.unsubscribe();
super.onDestroy();
}
@Override
public Dialog onCreateDialog(Bundle savedInstanceState)
{
MaterialDialog.Builder builder = new MaterialDialog.Builder(getActivity())
.title(R.string.share_with)
.cancelable(true)
.autoDismiss(false);
mAdapter = ...;
builder
.adapter(mAdapter, new MaterialDialog.ListCallback() {
@Override
public void onSelection(MaterialDialog materialDialog, View view, int i, CharSequence charSequence) {
if (!mReady)
return;
// handle click
}
});
MaterialDialog dlg = builder.build();
return dlg;
}
编辑
我换成与同时在后台线程上运行一个处理程序,但是这会导致以下execption:试图更新的适配器时CalledFromWrongThreadException
doOnNext
调用...我会说observeOn
应该具有在主线程上调用doOnNext
的效果,但看起来,这不起作用...
'mHandler'指向后台线程? – AndroidEx
我添加了“mHandler”的定义......并且不是,所以这就是行为的原因......让它在后台线程上运行会导致一个'CalledFromWrongThreadException'虽然虽然我在主线程中观察... – prom85
在你的情况'subscribeOn()'线程适用于'Observable.create()'中的所有内容。 'observeOn()'适用于'observeOn()'之后的所有内容,这里什么都没有,你可以删除这一行。 – AndroidEx