android 获取顶部栈点stack的Activity以及上下文Context

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一、获取顶部栈点的Activity的上下文Context

         MyApp.getApplication().getNowTopContext();

public class MyApp extends Application {

    public static MyApp application;

    @Override
    public void onCreate() {
        super.onCreate();
        this.application = this;
        initLifecycle(this);
    }

    public static MyApp getApplication() {
        return application;
    }

    public Context getNowTopContext() {
        return  mContext == null ? null : mContext.get();
    }

  

public WeakReference<Context> mContext;private void initLifecycle(Application application) {application.registerActivityLifecycleCallbacks(new Application.ActivityLifecycleCallbacks() {@Overridepublic void onActivityCreated(Activity activity, Bundle savedInstanceState) {if (activity.getParen

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