RxAndroid 应用（三）（简易天气App之Observable内存泄露)

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RxAndroid 应用（一）（简易天气App)

RxAndroid 应用（二）（简易天气App)

RxAndroid 应用（四）（简易天气App之RxBus)

在我们的Handler使用不当会发生内存泄露，那么Observable会不会发生持有context而导致内存泄露呢？答案是肯定的，接下来就来看看怎样避免。

public class RxUtils {    public static void unsubscribeIfNotNull(Subscription subscription) {        if (subscription != null) {            subscription.unsubscribe();        }    }    public static CompositeSubscription getNewCompositeSubIfUnsubscribed(CompositeSubscription subscription) {        if (subscription == null || subscription.isUnsubscribed()) {            return new CompositeSubscription();        }        return subscription;    }}

CompositeSubscription内部有一个Subscription的Set对象的集合，可以调用unsubscription()方法取消集合中所有subcription的订阅。

public class BasePresenterImpl implements BasePresenter {    protected CompositeSubscription mSubscriptions = new CompositeSubscription();    @Override    public void onCreate() {        mSubscriptions = RxUtils.getNewCompositeSubIfUnsubscribed(mSubscriptions);    }    @Override    public void onResume() {    }    @Override    public void onPause() {    }    @Override    public void onDestroy() {        mSubscriptions.unsubscribe();    }}

public class MainPresenterImpl extends BasePresenterImpl implements MainPresenter {    private final Logger mLogger = Logger.getLogger(getClass());    private MainView mMainView;    public MainPresenterImpl(MainView mainView) {        mMainView = mainView;    }    @Override    public void getWeatherData(String place) {        if (TextUtils.isEmpty(place)) {            return;        }        mMainView.showProgress();        mSubscriptions.add(ServiceManager.getInstance().getApiService().getWeatherInfo(place, Constants.BAIDU_AK)                .subscribeOn(Schedulers.io())                .observeOn(AndroidSchedulers.mainThread())                .subscribe(new Subscriber<WeatherResponse>() {                    @Override                    public void onCompleted() {                        mMainView.hideProgress();                    }                    @Override                    public void onError(Throwable e) {                        mLogger.error(e.getMessage(), e);                        mMainView.hideProgress();                    }                    @Override                    public void onNext(WeatherResponse weatherResponse) {                        mMainView.setupWeatherData(weatherResponse);                    }                }));    }    @Override    public void getPlaceData() {        PlaceRepository repository = new PlaceRepository();        mSubscriptions.add(repository.getPlaceList(BaseApplication.getInstance())                .subscribeOn(Schedulers.io())                .observeOn(AndroidSchedulers.mainThread())                .subscribe(new Subscriber<List<Place>>() {                    @Override                    public void onNext(List<Place> places) {                        mMainView.setupPlaceData(places);                    }                    @Override                    public void onCompleted() {                    }                    @Override                    public void onError(Throwable e) {                        mLogger.error(e.getMessage(), e);                    }                }));    }    @Override    public void getPlaceAndWeatherData(String place) {        mMainView.showProgress();        PlaceRepository repository = new PlaceRepository();        Context context = BaseApplication.getInstance();        Observable placeObservable = repository.getPlaceList(context);        Observable weatherObservable =  ServiceManager.getInstance().getApiService().getWeatherInfo(place, Constants.BAIDU_AK);        mSubscriptions.add(Observable.merge(placeObservable, weatherObservable)                .subscribeOn(Schedulers.io())                .observeOn(AndroidSchedulers.mainThread())                .subscribe(new Subscriber<Object>() {                    @Override                    public void onCompleted() {                        mMainView.hideProgress();                    }                    @Override                    public void onError(Throwable e) {                        mLogger.error(e.getMessage(), e);                        mMainView.hideProgress();                    }                    @Override                    public void onNext(Object obj) {                        if (obj instanceof List) {                            mMainView.setupPlaceData((List<Place>) obj);                        } else if (obj instanceof WeatherResponse) {                            mMainView.setupWeatherData((WeatherResponse) obj);                        }                    }                }));    }}

如上代码所述，我们将所有Observable对象添加到CompositeSubscription中统一管理，避免产生Observable内存泄露情况

代码地址：https://github.com/mickyliu945/CommonProj

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