[Android] 如何在 Activity 或者 Fragment 的生命周期结束时停止订阅 Observable

NavUtil
利用 NavUtil，你可以在 Activity 或 Fragment 的生命周期发生变化时，停止订阅你的 Observable。
Usage
首先，需要初始化 NavUtil 单例
public class App extends Application {    @Override    public void onCreate() {        super.onCreate();        NavUtil.init(this);    }}
然后，在Activity 中，为你的 Observable 应用 compose 操作符，如下所示：
Observable.interval(1, TimeUnit.SECONDS)    .compose(NavUtil.<Long>subscribeUtilEvent(this, LifecycleEvent.ON_STOPPED))    .subscribe(new Subscriber<Long>() {        @Override        public void onCompleted() {            Log.d(TAG, "onStart onCompleted() called");        }        @Override        public void onError(Throwable e) {            Log.d(TAG, "onStart onError() called with: e = [" + e + "]");        }        @Override        public void onNext(Long aLong) {            Log.d(TAG, "onStart onNext() called with: aLong = [" + aLong + "]");        }    });
在 Fragment 中的用法如下所示：
Observable.interval(1, TimeUnit.SECONDS)    .compose(NavUtil.<Long>subscribeUtilEvent(this, LifecycleEvent.ON_PAUSED))    .subscribe(new Subscriber<Long>() {        @Override        public void onCompleted() {            Log.d(TAG, "onCompleted() called");        }        @Override        public void onError(Throwable e) {            Log.d(TAG, "onError() called with: e = [" + e + "]");        }        @Override        public void onNext(Long aLong) {            Log.d(TAG, "onNext() called with: aLong = [" + aLong + "]");        }    });
目前支持的生命周期事件如下所示：
 public enum LifecycleEvent {    ON_PAUSED,    ON_STOPPED,    ON_SAVE_INSTANCE_STATE,    ON_DESTROYED,    ON_VIEW_DESTORYED,    ON_DETACHED,}
Gradle
compile 'com.legendmohe.maven:navutil:x.y'
  

查看原文：http://legendmohe.net/2017/01/23/android-%e5%a6%82%e4%bd%95%e5%9c%a8-activity-%e6%88%96%e8%80%85-fragment-%e7%9a%84%e7%94%9f%e5%91%bd%e5%91%a8%e6%9c%9f%e7%bb%93%e6%9d%9f%e6%97%b6%e5%81%9c%e6%ad%a2%e8%ae%a2%e9%98%85-observable/