android - 错误 : not an enclosing class: MainActivity

Question

这是我收到错误的代码:错误:不是封闭类:MainActivity。请帮我看看我的代码有什么问题。

public class MyFirebaseMessagingSerivce extends FirebaseMessagingService {
    @Override
    public void onNewToken(String s) {
        super.onNewToken(s);
        Log.e("NEW_TOKEN", s);
    }

    public void onMessageReceived(RemoteMessage remoteMessage) {
        super.onMessageReceived(remoteMessage);

    }
    public void onCreate() {
        super.onCreate();
        FirebaseInstanceId.getInstance().getInstanceId().addOnSuccessListener( MainActivity.this,  new OnSuccessListener<InstanceIdResult>() {
            @Override
            public void onSuccess(InstanceIdResult instanceIdResult)
            {
                String updatedToken = instanceIdResult.getToken();
                Log.e("Updated Token",updatedToken);

            }
        });
    }

}

Answer 1

Can we use this one in FirebaseMessagingService?

否 FirebaseInstanceId.getInstance().getInstanceId().addOnSuccessListener() 方法用于在 Activity 中获取 token

onNewToken() 方法用于在 FirebaseMessagingService 中获取 token

有关更多信息，请查看 Frank van Puffelen how onNewToken and FirebaseInstanceId.getInstance().getInstanceId() will work 的答案

同时检查 FirebaseMessagingService

示例代码

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        FirebaseInstanceId.getInstance().getInstanceId().addOnSuccessListener( MainActivity.this,  new OnSuccessListener<InstanceIdResult>() {
            @Override
            public void onSuccess(InstanceIdResult instanceIdResult)
            {
                String updatedToken = instanceIdResult.getToken();
                Log.e("Updated Token",updatedToken);

            }
        });


    }

}