极光推送获取不到RegisterId(注册ID)Android

官方文档介绍了两种获取RegistrationID的方法：
https://docs.jiguang.cn/jpush/client/Android/android_api/#registrationid-api
//SDK 初次注册成功后，开发者通过在自定义的 Receiver 里监听 Action - cn.jpush.android.intent.REGISTRATION 来获取对应的 RegistrationID。注册成功后，也可以通过此函数获取
public static String getRegistrationID(Context context)

在下看来第一种是误导，应该在application中才能拿到！！！而不是自定义Receiver!在application中对其进行的初始化！！

 registrationId = JPushInterface.getRegistrationID(this);         Log.e("1099", "run:--------->registrationId： "+registrationId );

public class MyApplication extends Application {    public static String registrationId;    private List mList = new LinkedList();    public static MyApplication instance;    private static Context context;    @Override    public void onCreate() {        super.onCreate();        JPushInterface.setDebugMode(true);        JPushInterface.init(this);        registrationId = JPushInterface.getRegistrationID(this);         Log.e("1099", "run:--------->registrationId： "+registrationId );        SharePLogin mSharePLogin=new SharePLogin(this);        mSharePLogin.saveData("registrationId",registrationId);        Toast.makeText(instance, "registrationId", Toast.LENGTH_SHORT).show();        instance = this;        OkHttpClient okHttpClient = new OkHttpClient.Builder()//                .addInterceptor(new LoggerInterceptor("TAG"))                .connectTimeout(10000L, TimeUnit.MILLISECONDS)                .readTimeout(10000L, TimeUnit.MILLISECONDS)                        //其他配置                .build();        OkHttpUtils.initClient(okHttpClient);        MobclickAgent.setScenarioType(getApplicationContext(), MobclickAgent.EScenarioType.E_UM_NORMAL);    }    public MyApplication() {    }    public static String getRegistrationId() {        return registrationId;    }    public static void setRegistrationId(String registrationId) {        MyApplication.registrationId = registrationId;    }    public synchronized static MyApplication getInstance() {        if (null == instance) {            instance = new MyApplication();        }        return instance;    }    public static Context getContext(){        return context;    }    // add Activity    public void addActivity(Activity activity) {        System.out.println("add");        mList.add(activity);    }    public void exitOther() {        for (int i = 0; i < mList.size() - 1; i++) {            mList.get(i).finish();        }    }    public void exit() {        try {            for (Activity activity : mList) {                if (activity != null)                    activity.finish();            }        } catch (Exception e) {            e.printStackTrace();        } finally {            System.exit(0);        }    }    public void onLowMemory() {        super.onLowMemory();        System.gc();    }}

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