RxJava中怎么实现取消订阅功能，相信很多没有经验的人对此束手无策，为此本文总结了问题出现的原因和解决方法，通过这篇文章希望你能解决这个问题。
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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() { @Override public void subscribe(ObservableEmitter emitter) throws Exception { try { Thread.sleep(5000); } catch (InterruptedException e) { e.printStackTrace(); } } }).subscribeOn(Schedulers.io()) .observeOn(AndroidSchedulers.mainThread()) .subscribe(new Consumer() { @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() { @Override public void subscribe(ObservableEmitter emitter) throws Exception { try { Thread.sleep(5000); emitter.onNext("testInfo"); } catch (InterruptedException e) { e.printStackTrace(); } } }).subscribeOn(Schedulers.io()) .observeOn(AndroidSchedulers.mainThread()) .subscribe(new Observer() { @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 observer; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_fourth); observer = Observable.create(new ObservableOnSubscribe() { @Override public void subscribe(ObservableEmitter emitter) throws Exception { try { Thread.sleep(5000); emitter.onNext("testInfo"); } catch (InterruptedException e) { e.printStackTrace(); } } }).subscribeOn(Schedulers.io()) .observeOn(AndroidSchedulers.mainThread()) .subscribeWith(new DisposableObserver() { @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() { @Override public void subscribe(ObservableEmitter 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() { @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() { @Override public void subscribe(ObservableEmitter emitter) throws Exception { try { Thread.sleep(5000); emitter.onNext("testInfo"); } catch (InterruptedException e) { e.printStackTrace(); } } }).subscribeOn(Schedulers.io()) .observeOn(AndroidSchedulers.mainThread()) .subscribe(new Observer() { @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.bindToLifecycle()) .subscribe(new Consumer() { @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.bindUntilEvent(ActivityEvent.PAUSE)) .subscribe(new Consumer() { @Override public void accept(Long aLong) throws Exception { Log.d(TAG, "bindUntilEvent accept: " + aLong); } });
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