RxJava取消订阅的各种方式的实现

手动取消订阅

Consumer类型

Observable创建返回Disposable取消

public class SecondActivity extends AppCompatActivity {

private static final String TAG = "SecondActivity";
private Disposable disposable;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_second);
disposable = Observable.create(new ObservableOnSubscribe<String>() {
@Override
public void subscribe(ObservableEmitter<String> emitter) throws Exception {
try {
Thread.sleep(5000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}).subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())
.subscribe(new Consumer<String>() {
@Override
public void accept(String s) throws Exception {
Log.d(TAG, "accept: "+s);
}
});
}

@Override
protected void onDestroy() {
super.onDestroy();
Log.d(TAG, "onDestroy: ");
//取消订阅
if(disposable != null && !disposable.isDisposed()){
disposable.dispose();
Log.d(TAG, "onDestroy: dispose");
}
}
}

普通类型Observer

在Observer中获取Disposable然后取消

public class ThirdActivity extends AppCompatActivity {
private static final String TAG = "ThirdActivity";
Disposable disposable;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_third);
Observable.create(new ObservableOnSubscribe<String>() {
@Override
public void subscribe(ObservableEmitter<String> emitter) throws Exception {
try {
Thread.sleep(5000);
emitter.onNext("testInfo");
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}).subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())
.subscribe(new Observer<String>() {
@Override
public void onSubscribe(Disposable d) {
disposable = d;
}

@Override
public void onNext(String s) {
Log.d(TAG, "onNext: "+s);
}

@Override
public void onError(Throwable e) {
Log.d(TAG, "onError: ");
}

@Override
public void onComplete() {
Log.d(TAG, "onComplete: ");
}
});
}

@Override
protected void onDestroy() {
super.onDestroy();
Log.d(TAG, "onDestroy: ");
//然后在需要取消订阅的地方调用即可
if (disposable != null && !disposable.isDisposed()) {
Log.d(TAG, "dispose: ");
disposable.dispose();
}
}
}

DisposableObserver类型

利用DisposableObserver和SubscribeWith直接返回Disposable，然后取消

public class FourthActivity extends AppCompatActivity {
private static final String TAG = "FourthActivity";
private DisposableObserver<String> observer;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_fourth);
observer = Observable.create(new ObservableOnSubscribe<String>() {
@Override
public void subscribe(ObservableEmitter<String> emitter) throws Exception {
try {
Thread.sleep(5000);
emitter.onNext("testInfo");
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}).subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())
.subscribeWith(new DisposableObserver<String>() {
@Override
public void onNext(String o) {
Log.d(TAG, "onNext: "+o);
}

@Override
public void onError(Throwable e) {
Log.d(TAG, "onError: ");
}

@Override
public void onComplete() {
Log.d(TAG, "onComplete: ");
}
});
}

@Override
protected void onDestroy() {
super.onDestroy();
if (observer != null && !observer.isDisposed()) {
Log.d(TAG, "dispose: ");
observer.dispose();
}
}
}

取消多个Observer

把多个Observer添加CompositeDisposable，一次取消

public class ComDisposableActivity extends AppCompatActivity {

private Disposable disposable1;
private Disposable disposable2;
private static final String TAG = "ComDisposableActivity";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_com_disposable);
Observable.create(new ObservableOnSubscribe<String>() {
@Override
public void subscribe(ObservableEmitter<String> emitter) throws Exception {
try {
Thread.sleep(5000);
emitter.onNext("testInfo");
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}).subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())
.doOnDispose(new Action() {
@Override
public void run() throws Exception {
Log.d(TAG, "run: Unsubscribing subscription from onCreate()");
}
})
.subscribe(new Observer<String>() {
@Override
public void onSubscribe(Disposable d) {
disposable1 = d;
}

@Override
public void onNext(String s) {
Log.d(TAG, "onNext: "+s);
}

@Override
public void onError(Throwable e) {
Log.d(TAG, "onError: ");
}

@Override
public void onComplete() {
Log.d(TAG, "onComplete: ");
}
});
Observable.create(new ObservableOnSubscribe<String>() {
@Override
public void subscribe(ObservableEmitter<String> emitter) throws Exception {
try {
Thread.sleep(5000);
emitter.onNext("testInfo");
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}).subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())
.subscribe(new Observer<String>() {
@Override
public void onSubscribe(Disposable d) {
disposable2 = d;
}

@Override
public void onNext(String s) {
Log.d(TAG, "onNext: "+s);
}

@Override
public void onError(Throwable e) {
Log.d(TAG, "onError: ");
}

@Override
public void onComplete() {
Log.d(TAG, "onComplete: ");
}
});
}

@Override
protected void onDestroy() {
super.onDestroy();
CompositeDisposable compositeDisposable = new CompositeDisposable();
//批量添加
compositeDisposable.add(disposable1);
compositeDisposable.add(disposable2);
//最后一次性全部取消订阅
compositeDisposable.dispose();
}
}

RxLifecyle取消

OnDestory取消

Observable.interval(1, TimeUnit.SECONDS)
.doOnDispose(new Action() {
@Override
public void run() throws Exception {
Log.d(TAG, "Unsubscribing bindToLifecycle from onDestroy()");
}
})
.compose(this.<Long>bindToLifecycle())
.subscribe(new Consumer<Long>() {
@Override
public void accept(Long num) throws Exception {
Log.d(TAG, "accept: " + num);
}
});

指定生命周期取消

Observable.interval(1,TimeUnit.SECONDS)
.doOnDispose(new Action() {
@Override
public void run() throws Exception {
Log.d(TAG, "Unsubscribing UbindUntilEvent from onPause()");
}
}).compose(this.<Long>bindUntilEvent(ActivityEvent.PAUSE))
.subscribe(new Consumer<Long>() {
@Override
public void accept(Long aLong) throws Exception {
Log.d(TAG, "bindUntilEvent accept: " + aLong);
}
});

以上就是本文的全部内容，希望对大家的学习有所帮助

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