对RxJava中缓冲区的错误理解
我正在努力熟悉RxJava。以下是我试图实现的用例: 我的屏幕上有一个按钮,我正试图收集点击次数。因此,如果用户点击该按钮,则会记录一次点击并生成一个日志。现在,如果用户点击按钮两次,那么它会记录两次点击,收集它们并输出2而不是1 从本质上说,我试图在一段时间内累积点击次数,然后吐出最终结果。我猜“”是我需要使用的方法。我在Android中快速创建了一个示例(代码如下),但是buffer方法似乎不像收集所有事件输入并抛出一个集合那样简单对RxJava中缓冲区的错误理解,java,android,frp,rx-java,Java,Android,Frp,Rx Java,我正在努力熟悉RxJava。以下是我试图实现的用例: 我的屏幕上有一个按钮,我正试图收集点击次数。因此,如果用户点击该按钮,则会记录一次点击并生成一个日志。现在,如果用户点击按钮两次,那么它会记录两次点击,收集它们并输出2而不是1 从本质上说,我试图在一段时间内累积点击次数,然后吐出最终结果。我猜“”是我需要使用的方法。我在Android中快速创建了一个示例(代码如下),但是buffer方法似乎不像收集所有事件输入并抛出一个集合那样简单 public class DemoFragment
public class DemoFragment
extends Fragment {
private int _tapCount = 0;
private Observable<List<Integer>> _bufferedObservable;
private Observer<List<Integer>> _observer;
@Override
public void onActivityCreated(@Nullable Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
_setupLogger();
_bufferedObservable = _getBufferedObservable();
_observer = _getObserver();
}
// the library butterknife allows this
@OnClick(R.id.btn_start_operation)
public void onButtonTapped() {
_log("GOT A TAP");
_bufferedObservable.subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())
.subscribe(_observer);
}
private Observable<List<Integer>> _getBufferedObservable() {
return Observable.create(new Observable.OnSubscribe<Integer>() {
@Override
public void call(Subscriber<? super Integer> subscriber) {
subscriber.onNext(1); // send one tap here
}
}).buffer(2, TimeUnit.SECONDS); // collect all taps in the last 2s
}
private Observer<List<Integer>> _getObserver() {
return new Observer<List<Integer>>() {
@Override
public void onCompleted() {
_log(String.format("%d taps", _tapCount));
_tapCount = 0; // reset tap count
}
@Override
public void onError(Throwable e) {}
@Override
public void onNext(List<Integer> integers) {
if (integers.size() > 0) {
for (int i : integers) {
_tapCount += i;
}
onCompleted();
} else {
_log("No taps received");
}
}
};
}
// ... other method that help wiring up the example (irrelevant to RxJava)
}
公共类DemoFragment
扩展片段{
私有整数_tapCount=0;
私有可观测_缓冲可观测;
私人观察员;
@凌驾
ActivityCreated上的公共无效(@Nullable Bundle savedinStateCState){
super.onActivityCreated(savedInstanceState);
_setupLogger();
_bufferedObservable=_getBufferedObservable();
_观察者=_getObserver();
}
//库butterknife允许这样做
@OnClick(R.id.btn\u启动\u操作)
public void onButtonTapped(){
_日志(“得到一个水龙头”);
_bufferedObservable.subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())
.订阅(_观察员);
}
私有可观测_getBufferedObservable(){
返回Observable.create(newobservable.OnSubscribe(){
@凌驾
public void call(订户这里有一个代码,显示我将如何执行此操作(假设您的按钮id为R.id.rx_button
):
我认为最好使用awesome库来实现这一点。我认为解决方案更干净,尤其是使用lambdas时。我使用了filter操作符,因此我只在onNext()中得到结果,其中用户在给定的2秒内按了5次以上
我基于()中的一个示例,该示例使用旧的rx绑定依赖项
@Override
public void onResume() {
super.onResume();
mClickSubscription = getBufferedSubscription();
}
@Override
public void onPause() {
super.onPause();
mClickSubscription.unsubscribe();
}
private Subscription getBufferedSubscription() {
return RxView.clicks(rx_button)
.map(aVoid -> 1)
.buffer(2, TimeUnit.SECONDS)
.filter(integers -> integers.size() > 5)
.observeOn(AndroidSchedulers.mainThread())
.subscribe(new Observer<List<Integer>>() {
@Override
public void onCompleted() {
// fyi: you'll never reach here
}
@Override
public void onError(Throwable e) {
SLog.i("Dang error! check your logs");
}
@Override
public void onNext(List<Integer> integers) {
SLog.i(String.format("%d taps", integers.size()));
}
});
}
@覆盖
恢复时公开作废(){
super.onResume();
mClickSubscription=getBufferedSubscription();
}
@凌驾
公共无效暂停(){
super.onPause();
mClickSubscription.unsubscripte();
}
私有订阅getBufferedSubscription(){
返回RxView.点击(接收按钮)
.map(避免->1)
.缓冲区(2,时间单位。秒)
.filter(整数->整数.size()>5)
.observeOn(AndroidSchedulers.mainThread())
.订阅(新观察员){
@凌驾
未完成的公共无效(){
//仅供参考:你永远也到不了这里
}
@凌驾
公共无效申报人(可丢弃的e){
SLog.i(“该死的错误!检查日志”);
}
@凌驾
public void onNext(列出整数){
SLog.i(String.format(“%d taps”,integers.size());
}
});
}
试试下面的代码:
public class BufferExampleActivity extends AppCompatActivity {
private static final String TAG = BufferExampleActivity.class.getSimpleName();
Button btn;
TextView textView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_example);
btn = (Button) findViewById(R.id.btn);
textView = (TextView) findViewById(R.id.textView);
btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
doSomeWork();
}
});
}
/*
* simple example using buffer operator - bundles all emitted values into a list
*/
private void doSomeWork() {
Observable<List<String>> buffered = getObservable().buffer(3, 1);
// 3 means, it takes max of three from its start index and create list
// 1 means, it jumps one step every time
// so the it gives the following list
// 1 - one, two, three
// 2 - two, three, four
// 3 - three, four, five
// 4 - four, five
// 5 - five
buffered.subscribe(getObserver());
}
private Observable<String> getObservable() {
return Observable.just("one", "two", "three", "four", "five");
}
private Observer<List<String>> getObserver() {
return new Observer<List<String>>() {
@Override
public void onSubscribe(Disposable d) {
Log.d(TAG, " onSubscribe : " + d.isDisposed());
}
@Override
public void onNext(List<String> stringList) {
textView.append(" onNext size : " + stringList.size());
textView.append(AppConstant.LINE_SEPARATOR);
Log.d(TAG, " onNext : size :" + stringList.size());
for (String value : stringList) {
textView.append(" value : " + value);
textView.append(AppConstant.LINE_SEPARATOR);
Log.d(TAG, " : value :" + value);
}
}
@Override
public void onError(Throwable e) {
textView.append(" onError : " + e.getMessage());
textView.append(AppConstant.LINE_SEPARATOR);
Log.d(TAG, " onError : " + e.getMessage());
}
@Override
public void onComplete() {
textView.append(" onComplete");
textView.append(AppConstant.LINE_SEPARATOR);
Log.d(TAG, " onComplete");
}
};
}
}
公共类BufferExampleActivity扩展了AppCompativity{
私有静态最终字符串标记=BufferExampleActivity.class.getSimpleName();
按钮btn;
文本视图文本视图;
@凌驾
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_示例);
btn=(按钮)findViewById(R.id.btn);
textView=(textView)findViewById(R.id.textView);
btn.setOnClickListener(新视图.OnClickListener(){
@凌驾
公共void onClick(视图){
doSomeWork();
}
});
}
/*
*使用缓冲区运算符的简单示例-将所有发出的值捆绑到一个列表中
*/
私人文件{
Observable buffered=getObservable().buffer(3,1);
//3意味着,它从开始索引和创建列表中最多取三个
//1表示每次跳一步
//因此,它给出了以下列表
//一,二,三
//2-2,3,4
//3-3,4,5
//4-4,5
//5-5
subscribe(getObserver());
}
私有可观察getObservable(){
可观察的回报。只是(“一”、“二”、“三”、“四”、“五”);
}
私有观察者getObserver(){
返回新的观察者(){
@凌驾
认购的公共无效(一次性d){
Log.d(标记为“onSubscribe:+d.isDisposed());
}
@凌驾
public void onNext(列表字符串列表){
textView.append(“onNext size:+stringList.size());
textView.append(AppConstant.LINE_分隔符);
Log.d(标记“onNext:size:+stringList.size());
用于(字符串值:stringList){
textView.append(“值:”+value);
textView.append(AppConstant.LINE_分隔符);
Log.d(标记:“:值:”+值);
}
}
@凌驾
公共无效申报人(可丢弃的e){
append(“onError:+e.getMessage());
textView.append(AppConstant.LINE_分隔符);
Log.d(标记“onError:+e.getMessage());
}
@凌驾
未完成的公共空间(){
textView.append(“onComplete”);
textView.append(AppConstant.LINE_分隔符);
Log.d(标签“未完成”);
}
};
}
}
首先,哪一个?“Buffer”不是运算符。建议Buffer是运算符。不,它不是。似乎有一种称为“operator Buffer”的东西,但它不能转换为“Buffer是我应该使用的运算符”。Buffer()是一种方法
@Override
public void onResume() {
super.onResume();
mClickSubscription = getBufferedSubscription();
}
@Override
public void onPause() {
super.onPause();
mClickSubscription.unsubscribe();
}
private Subscription getBufferedSubscription() {
return RxView.clicks(rx_button)
.map(aVoid -> 1)
.buffer(2, TimeUnit.SECONDS)
.filter(integers -> integers.size() > 5)
.observeOn(AndroidSchedulers.mainThread())
.subscribe(new Observer<List<Integer>>() {
@Override
public void onCompleted() {
// fyi: you'll never reach here
}
@Override
public void onError(Throwable e) {
SLog.i("Dang error! check your logs");
}
@Override
public void onNext(List<Integer> integers) {
SLog.i(String.format("%d taps", integers.size()));
}
});
}
public class BufferExampleActivity extends AppCompatActivity {
private static final String TAG = BufferExampleActivity.class.getSimpleName();
Button btn;
TextView textView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_example);
btn = (Button) findViewById(R.id.btn);
textView = (TextView) findViewById(R.id.textView);
btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
doSomeWork();
}
});
}
/*
* simple example using buffer operator - bundles all emitted values into a list
*/
private void doSomeWork() {
Observable<List<String>> buffered = getObservable().buffer(3, 1);
// 3 means, it takes max of three from its start index and create list
// 1 means, it jumps one step every time
// so the it gives the following list
// 1 - one, two, three
// 2 - two, three, four
// 3 - three, four, five
// 4 - four, five
// 5 - five
buffered.subscribe(getObserver());
}
private Observable<String> getObservable() {
return Observable.just("one", "two", "three", "four", "five");
}
private Observer<List<String>> getObserver() {
return new Observer<List<String>>() {
@Override
public void onSubscribe(Disposable d) {
Log.d(TAG, " onSubscribe : " + d.isDisposed());
}
@Override
public void onNext(List<String> stringList) {
textView.append(" onNext size : " + stringList.size());
textView.append(AppConstant.LINE_SEPARATOR);
Log.d(TAG, " onNext : size :" + stringList.size());
for (String value : stringList) {
textView.append(" value : " + value);
textView.append(AppConstant.LINE_SEPARATOR);
Log.d(TAG, " : value :" + value);
}
}
@Override
public void onError(Throwable e) {
textView.append(" onError : " + e.getMessage());
textView.append(AppConstant.LINE_SEPARATOR);
Log.d(TAG, " onError : " + e.getMessage());
}
@Override
public void onComplete() {
textView.append(" onComplete");
textView.append(AppConstant.LINE_SEPARATOR);
Log.d(TAG, " onComplete");
}
};
}
}