RxJava原理与自定义操作符-----自定义RxView操作符

自定义操作符

写一个防抖操作符

public class RxView {

    private final static String TAG = RxView.class.getSimpleName();

    // 我们自己的操作符 == 函数
    public static Observable<Object> clicks(View view) {
        return new ViewClickObservable(view);
    }
    
}

public class ViewClickObservable extends Observable<Object> {

    private final View view;
    
    private static final Object EVENT = new Object();
    private static Object EVENT2;

    public ViewClickObservable(View view) {
        this.view = view;

        EVENT2 = view;
    }

    @Override
    protected void subscribeActual(Observer<? super Object> observer) {
        // 可以干自己的

        MyListener myListener = new MyListener(view, observer);
        observer.onSubscribe(myListener);

        this.view.setOnClickListener(myListener);
    }

    // 我们的包裹
    static final class MyListener implements View.OnClickListener, Disposable {

        private final View view;
        private Observer<Object> observer;  // 存一份 下一层

        // 原子性
        // boolean  == AtomicBoolean
        private final AtomicBoolean isDisposable = new AtomicBoolean();

        public MyListener(View view, Observer<Object> observer) {
            this.view = view;
            this.observer = observer;


        }

        @Override
        public void onClick(View v) {
            if (isDisposed() == false) {
                observer.onNext(EVENT);
            }

        }

        // 如果用调用了 中断
        @Override
        public void dispose() {
            // 如果没有中断过，才有资格，   取消view.setOnClickListener(null);
            if (isDisposable.compareAndSet(false, true)) {
                // 主线程 很好的中断
                if (Looper.myLooper() == Looper.getMainLooper()) {
                    view.setOnClickListener(null);

                } else { // 主线程，通过Handler的切换
                    /*new Handler(Looper.getMainLooper()) {
                        @Override
                        public void handleMessage(@NonNull Message msg) {
                            super.handleMessage(msg);
                            view.setOnClickListener(null);
                        }
                    };*/

                    // HandlerScheduler.scheduleDirect

                    AndroidSchedulers.mainThread().scheduleDirect(new Runnable() {
                        @Override
                        public void run() {
                            view.setOnClickListener(null);
                        }
                    });
                }
            }
        }

        @Override
        public boolean isDisposed() {
            return isDisposable.get();
        }
    }
}

public class RxActivity extends AppCompatActivity {

    @SuppressLint("CheckResult")
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_rx);

        // 给这个控件做防抖
        Button button = findViewById(R.id.button);

        RxView.clicks(button)
                .throttleFirst(2000, TimeUnit.MILLISECONDS)
                .subscribe(new Consumer<Object>() {
                    @Override
                    public void accept(Object o) throws Exception {
                        Observable.create(new ObservableOnSubscribe<String>() {
                            @Override
                            public void subscribe(ObservableEmitter<String> e) throws Exception {
                                e.onNext("puppy");
                            }
                        })
                                .subscribe(new Consumer<String>() {
                                    @Override
                                    public void accept(String s) throws Exception {
                                        Log.d(L.TAG, "accept: 终点：" + s);
                                    }
                                });
                    }
                });
    }
}

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".rx.RxActivity">

    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Button"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

com.example.rxjava D/RxJavaThreadSource: accept: 终点：puppy

用RxJava分发数组打印：

性能不如for循环

public class TestActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_test);

        String[] str = {"A", "B", "C", "D"};

        //for循环打印数组
        for (String s : str) {
            Log.d(L.TAG, "onCreate0: " + s);
        }

        //分发打印数组 性能不如for
        Disposable disposable = Observable.fromArray(str)
                .subscribe(v-> {
                    Log.d(L.TAG, "onCreate1: " + v);
                });
    }
}