[英]How to implement search feature with SearchView, Retrofit and RxJava (RxBindings)?
當用戶鍵入SearchView
小部件時,應用程序應進行API調用( 在后台線程中 )以從服務器獲取搜索結果,並在RecyclerView中顯示它們( 在UI線程中 )。
我在我的片段中使用以下代碼:
@Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
inflater.inflate(R.menu.my_fragment, menu);
SearchView searchView = (SearchView) menu.findItem(R.id.action_search).getActionView();
SearchManager searchManager = (SearchManager) getActivity().getSystemService(Context.SEARCH_SERVICE);
searchView.setSearchableInfo(searchManager.getSearchableInfo(getActivity().getComponentName()));
RxSearchView.queryTextChanges(searchView)
.debounce(400, TimeUnit.MILLISECONDS)
.map(CharSequence::toString)
.switchMap(query -> retrofitService.search(query))
.subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())
.subscribe(new Subscriber<List<Item>>() {
@Override
public void onCompleted() {
}
@Override
public void onError(Throwable e) {
Log.e(LOG_TAG, "Error", e);
}
@Override
public void onNext(List<Item> items) {
// adapter.addItems(...)
}
});
}
但我得到一個例外:
java.lang.IllegalStateException: Must be called from the main thread. Was: Thread[RxIoScheduler-2,5,main]
at com.jakewharton.rxbinding.internal.Preconditions.checkUiThread(Preconditions.java:35)
at com.jakewharton.rxbinding.support.v7.widget.SearchViewQueryTextChangesOnSubscribe.call(SearchViewQueryTextChangesOnSubscribe.java:18)
at com.jakewharton.rxbinding.support.v7.widget.SearchViewQueryTextChangesOnSubscribe.call(SearchViewQueryTextChangesOnSubscribe.java:10)
...
當我刪除.subscribeOn(Schedulers.io())
,在創建片段並且在SearchView
沒有輸入查詢時觸發了搜索API調用,我得到了exeption
retrofit2.adapter.rxjava.HttpException: HTTP 422
然后,當我輸入我的搜索查詢時,不再調用retrofitService.search(query)
。
請記住,您實際上可以在rx鏈中使用多個observeOn
和多個subscribeOn
運算符。
試試這個:
RxSearchView.queryTextChanges(searchView)
.debounce(400, TimeUnit.MILLISECONDS)
.map(CharSequence::toString)
.subscribeOn(AndroidSchedulers.mainThread())
.observeOn(Schedulers.io())
.switchMap(query -> retrofitService.search(query))
.observeOn(AndroidSchedulers.mainThread())
.subscribe(new Subscriber<List<Item>>() {
@Override
public void onCompleted() {
}
@Override
public void onError(Throwable e) {
Log.e(LOG_TAG, "Error", e);
}
@Override
public void onNext(List<Item> items) {
// adapter.addItems(...)
}
});
這基本上會導致這個Thread使用:
我在生產應用程序上使用這種方法。
RxSearchView.queryTextChanges(searchView)
.debounce(300, TimeUnit.MILLISECONDS)
.filter(new Predicate<String>() {
@Override
public boolean test(String text) throws Exception {
if (text.isEmpty()) {
return false;
} else {
return true;
}
}
})
.distinctUntilChanged()
.switchMap(new Function<String, ObservableSource<String>>() {
@Override
public ObservableSource<String> apply(String query) throws Exception {
return dataFromNetwork(query);
}
})
.subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())
.subscribe(new Consumer<String>() {
@Override
public void accept(String result) throws Exception {
textViewResult.setText(result);
}
});
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