Android 基于结果的观测值链接
我是rx java和rx android的完全初学者。我听说一开始学习曲线相当陡峭 我试图通过使用rx android将所有基于Eventbus的代码替换为更安全的代码 我将此代码段设置为从编辑文本更改事件创建可观察项: main活动Android 基于结果的观测值链接,android,reactive-programming,rx-java,rx-android,Android,Reactive Programming,Rx Java,Rx Android,我是rx java和rx android的完全初学者。我听说一开始学习曲线相当陡峭 我试图通过使用rx android将所有基于Eventbus的代码替换为更安全的代码 我将此代码段设置为从编辑文本更改事件创建可观察项: main活动 RxUtils.createEditTextChangeObservable(txtInput).throttleLast(200, TimeUnit.MILLISECONDS, AndroidSchedulers.mainThread()).subscribe(
RxUtils.createEditTextChangeObservable(txtInput).throttleLast(200, TimeUnit.MILLISECONDS, AndroidSchedulers.mainThread()).subscribe(new Action1<EditText>() {
@Override
public void call(EditText editText) {
searchStopResultFragment.query(editText.getText().toString());
}
});
RxUtils.createEditTextChangeObservable(txtInput).throttleLast(200,TimeUnit.mills,AndroidSchedulers.mainThread()).subscribe(新操作1()){
@凌驾
公共作废调用(EditText EditText){
searchStopResultFragment.query(editText.getText().toString());
}
});
RxUtils:
public static Observable<EditText> createEditTextChangeObservable(final EditText editText){
return Observable.create(new Observable.OnSubscribe<EditText>() {
@Override
public void call(final Subscriber<? super EditText> subscriber) {
editText.addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
}
@Override
public void afterTextChanged(Editable s) {
if (subscriber.isUnsubscribed()) return;
subscriber.onNext(editText);
}
});
}
});
}
public void query(String query){
lastQuery = query;
resultObservable = StopProvider.getStopResultObservable(getActivity().getContentResolver(),query);
subscription = resultObservable.subscribeOn(Schedulers.newThread())
.observeOn(AndroidSchedulers.mainThread()).subscribe(new Observer<List<Stop>>() {
@Override
public void onCompleted() {
}
@Override
public void onError(Throwable e) {
}
@Override
public void onNext(List<Stop> stops) {
if(!lastQuery.equals("")) {
if(stops.size()>0) {
ArrayList<AdapterItem> items = adapter.getItems();
items.clear();
for (Stop stop : stops) {
SearchResultStopItem item = new SearchResultStopItem(stop, SearchResultStopItem.STOP);
items.add(item);
}
adapter.setItems(items);
adapter.notifyDataSetChanged();
}else{
//DO A NOTHER ASYNC QUERY TO FETCH RESULTS
}
}else{
showStartItems();
}
}
});
}
公共静态可观察createEditTextChangeObservable(最终EditText EditText){
返回Observable.create(newobservable.OnSubscribe(){
@凌驾
公共无效呼叫(最终用户使用concatmap和最新组合解决:
RxUtils.createEditTextChangeObservable(txtInput).throttleLast(200, TimeUnit.MILLISECONDS, AndroidSchedulers.mainThread()).concatMap(new Func1<EditText, Observable<Pair<String,List<Stop>>>>() {
@Override
public Observable<Pair<String, List<Stop>>> call(EditText editText) {
String query = editText.getText().toString();
//searchStopResultFragment.setLastQuery(query);
if(query.isEmpty()){
return Observable.just(null);
}
return Observable.combineLatest(StopProvider.getStopResultObservable(getContentResolver(), query), Observable.just(query), new Func2<List<Stop>, String, Pair<String, List<Stop>>>() {
@Override
public Pair<String, List<Stop>> call(List<Stop> stops, String s) {
return new Pair(s,stops);
}
});
}
}).concatMap(new Func1<Pair<String, List<Stop>>, Observable<List<Stop>>>() {
@Override
public Observable<List<Stop>> call(Pair<String, List<Stop>> queryAndStops) {
if(queryAndStops!=null) {
if (queryAndStops.second.size() == 0) {
return RestClient.service().locationName(queryAndStops.first).concatMap(new Func1<LocationNameResponse, Observable<? extends List<Stop>>>() {
@Override
public Observable<? extends List<Stop>> call(LocationNameResponse locationNameResponse) {
return Observable.just(locationNameResponse.getAddresses());
}
});
} else {
return Observable.just(queryAndStops.second);
}
}
return Observable.just(null);
}
}).subscribeOn(Schedulers.newThread())
.observeOn(AndroidSchedulers.mainThread()).compose(this.<List<Stop>>bindToLifecycle()).subscribe(new Action1<List<Stop>>() {
@Override
public void call(List<Stop> stops) {
if (stops != null) {
searchStopResultFragment.showStops(stops);
}else{
searchStopResultFragment.showStartItems();
}
}
}, new Action1<Throwable>() {
@Override
public void call(Throwable throwable) {
showError(throwable);
}
});
RxUtils.createEditTextChangeObservable(txtInput).throttleLast(200,TimeUnit.ms,AndroidSchedulers.mainThread()).concatMap(新函数1(){
@凌驾
公共可观察调用(EditText EditText){
字符串查询=editText.getText().toString();
//searchStopResultFragment.setLastQuery(查询);
if(query.isEmpty()){
返回可观察值。just(null);
}
返回Observable.CombineTest(StopProvider.GetStopResultToServable(getContentResolver(),query),Observable.just(query),new Func2(){
@凌驾
公共对呼叫(列表停止,字符串s){
返回新的一对(s,停止);
}
});
}
}).concatMap(新函数1(){
@凌驾
公共可观测呼叫(成对查询操作){
if(queryAndStops!=null){
if(queryAndStops.second.size()==0){
返回RestClient.service().locationName(queryAndStops.first).concatMap(new Func1在组合测试之后,您可以将第二个concatMap移动到您需要它的唯一位置
RxUtils.createEditTextChangeObservable(txtInput)
.throttleLast(200, TimeUnit.MILLISECONDS, AndroidSchedulers.mainThread())
.concatMap(new Func1<EditText, Observable<Pair<String, List<Stop>>>>() {
@Override
public Observable<Pair<String, List<Stop>>> call(EditText editText) {
String query = editText.getText().toString();
//searchStopResultFragment.setLastQuery(query);
if (query.isEmpty()) {
return Observable.just(null);
}
return Observable
.combineLatest(StopProvider.getStopResultObservable(getContentResolver(), query), Observable.just(query), new Func2<List<Stop>, String, Pair<String, List<Stop>>>() {
@Override
public Pair<String, List<Stop>> call(List<Stop> stops, String s) {
return new Pair(s, stops);
}
})
.concatMap(new Func1<R, Observable<? extends Pair<String, List<Stop>>>>() {
@Override
public Observable<? extends Pair<String, List<Stop>>> call(R r) {
if (queryAndStops.second.size() == 0) {
return RestClient.service().locationName(queryAndStops.first).concatMap(new Func1<LocationNameResponse, Observable<? extends List<Stop>>>() {
@Override
public Observable<? extends List<Stop>> call(LocationNameResponse locationNameResponse) {
return Observable.just(locationNameResponse.getAddresses());
}
});
} else {
return Observable.just(queryAndStops.second);
}
}
});
}
})
.subscribeOn(Schedulers.newThread())
.observeOn(AndroidSchedulers.mainThread()).compose(this.<List<Stop>>bindToLifecycle())
.subscribe(new Action1<List<Stop>>() {
@Override
public void call(List<Stop> stops) {
if (stops != null) {
searchStopResultFragment.showStops(stops);
} else {
searchStopResultFragment.showStartItems();
}
}
}, new Action1<Throwable>() {
@Override
public void call(Throwable throwable) {
showError(throwable);
}
});
RxUtils.createEditTextChangeObservable(txtInput)
.throttleLast(200,TimeUnit.ms,AndroidSchedulers.mainThread())
.concatMap(新函数1(){
@凌驾
公共可观察调用(EditText EditText){
字符串查询=editText.getText().toString();
//searchStopResultFragment.setLastQuery(查询);
if(query.isEmpty()){
返回可观察值。just(null);
}
可观测回波
.CombineTest(StopProvider.GetStopResultoServable(getContentResolver(),查询),Observable.just(查询),new Func2(){
@凌驾
公共对呼叫(列表停止,字符串s){
返回新的一对(s,停止);
}
})
.concatMap(新函数1以下是我的想法:
RxUtils.createEditTextChangeObservable(txtInput)
.throttleLast(200, TimeUnit.MILLISECONDS, AndroidSchedulers.mainThread())
.map(EXTRACT_STRING)
.filter(STRING_IS_NOT_EMPTY)
.concatMap(new Func1<EditText, Observable<Pair<String,List<Stop>>>>() {
@Override
public Observable<Pair<String, List<Stop>>> call(final String query) {
return StopProvider.getStopResultObservable(getContentResolver(), query)
.map(new Func1<List<Stop>, Pair<String, List<Stop>>>() {
// I think this map is a bit more readable than the
// combineLatest, and since "query" should not be changing
// anyway, the result should be the same (you have to
// declare it as final in the method signature, though
@Override
public Pair<String, List<Stop>> call(List<Stop> stops) {
return new Pair(query, stops);
}
});
}
)
.concatMap(new Func1<Pair<String, List<Stop>>, Observable<List<Stop>>>() {
@Override
public Observable<List<Stop>> call(Pair<String, List<Stop>> queryAndStops) {
if (queryAndStops.second.size() == 0) {
return RestClient.service().locationName(queryAndStops.first)
.map(new Func1<LocationNameResponse, List<Stop>>() {
@Override
public List<Stop> call(LocationNameResponse locationNameResponse) {
// since there was no if-else in your original code (you were always
// just wrapping the List in an Observable) I removed that, too
return locationNameResponse.getAddresses();
}
});
} else {
return Observable.just(queryAndStops.second);
}
}
)
.subscribeOn(Schedulers.newThread())
.observeOn(AndroidSchedulers.mainThread())
.compose(this.<List<Stop>>bindToLifecycle())
.subscribe(new Action1<List<Stop>>() {
@Override
public void call(List<Stop> stops) {
// since I don't know what your API is returning I think
// it's saver to keep this check in:
if (stops != null) {
searchStopResultFragment.showStops(stops);
} else {
searchStopResultFragment.showStartItems();
}
}
},
new Action1<Throwable>() {
@Override
public void call(Throwable throwable) {
showError(throwable);
}
});
RxUtils.createEditTextChangeObservable(txtInput)
.throttleLast(200,TimeUnit.ms,AndroidSchedulers.mainThread())
.map(提取字符串)
.filter(字符串\u不是空的)
.concatMap(新函数1(){
@凌驾
公共可观察调用(最终字符串查询){
返回StopProvider.GetStopResultoServable(getContentResolver(),查询)
.map(新函数1(){
//我认为这张地图比地图可读性好一点
//CombineTest,因为“查询”不应更改
//无论如何,结果应该是一样的(你必须
//不过,在方法签名中将其声明为final
@凌驾
公共对呼叫(列出站点){
返回新对(查询、停止);
}
});
}
)
.concatMap(新函数1(){
@凌驾
公共可观测呼叫(成对查询操作){
if(queryAndStops.second.size()==0){
返回RestClient.service().locationName(queryAndStops.first)
.map(新函数1(){
@凌驾
公共列表调用(LocationNameResponse LocationNameResponse){
//因为在您的原始代码中没有if-else(您总是
//只是将列表包装成一个可观察的)我也删除了它
返回locationNameResponse.getAddresses();
}
});
}否则{
返回可观察的。just(queryAndStops.second);
}
}
)
.subscribeOn(Schedulers.newThread())
.observeOn(AndroidSchedulers.mainThread())
.compose(this.bindToLifecycle())
.订阅(新操作1(){
@凌驾
公共无效呼叫(列出站点){
//因为我不知道你的API返回了什么,我想
//保持此签入状态非常重要:
如果(停止!=null){
searchStopResultFragment.showStops(停止);
}否则{
searchStopResultFragment.showStartItems();
}
}
},
新行动1(){
@凌驾
公共无效呼叫(可丢弃可丢弃){
淋浴器(可丢弃);
}
});
其中:
public static final Func1<EditText, String> EXTRACT_STRING = new Func1<EditText, String>() {
@Override
public void String call(EditText editText) {
return editText.getText().toString();
}
};
public static final Func1<String, Boolean> STRING_IS_NOT_EMPTY = new Func1<String, Boolean>() {
@Override
public void String call(String string) {
return !string.isEmpty();
}
};
public static final Func1 EXTRACT\u STRING=new Func1(){
@凌驾
公共无效字符串调用(EditText EditText){
返回editText.getText().toString();
}
};
公共静态最终Func1字符串\u为\u非\u空=新Func1(){
@凌驾
公共无效字符串调用(字符串){
return!string.isEmpty();
}
};
因此,这至少消除了返回Observable.just(null)
的需要,然后在链的下面检查它。使您的query()方法返回