RxBus告诉你：Android应用如何完全退出“最优雅”

首先，在基类BaseActivity里，注册RxBus监听：

public class BaseActivity extends AppCompatActivity {

    Subscription mSubscription;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        Utils.intiSySBar(this, R.color.colorblack);
        initRxBus();
    }

    //接收退出的指令，关闭所有activity
    private void initRxBus() {
        mSubscription = RxBus.getInstance().toObserverable(NormalEvent.class)
                .subscribe(new Action1<NormalEvent>() {
                               @Override
                               public void call(NormalEvent userEvent) {
                                   if (userEvent.getType() == -1) {
                                       finish();
                                   }
                               }
                           },
                        new Action1<Throwable>() {
                            @Override
                            public void call(Throwable throwable) {
                            }
                        });
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        if (!mSubscription.isUnsubscribed()) {
            mSubscription.unsubscribe();
        }
    }
}

这是事件实体NormalEvent:

public class NormalEvent {
    private int type;

    public NormalEvent(int type) {
        this.type = type;
    }

    public int getType() {
        return type;
    }

    public void setType(int type) {
        this.type = type;
    }
}

最后，在需要退出的地方调用：

 RxBus.getInstance().post(new NormalEvent(-1));//发送退出指令

大功告成！