如何在FirebaseMessagingService中获取上下文? [英] how to get the Context Inside the FirebaseMessagingService?

问题描述

我有一个应用程序，它使用FCM发送和接收消息.我已经按照文档中的建议实施了所有操作.

I have an app and It Uses FCM for sending and receiving messages. I have implemented every thing as suggested in docs.

现在在生成令牌时，我想将其保存到共享首选项中.但这给了错误.

Now on generation of token I want to save that into the Shared Preferrences. but it is giving error on that .

考虑类的名称就像

public class MyFirebaseMsgAndTokenService extends FirebaseMessagingService {

private static final String TAG = "C_MyFirebaseIIDService";

@Override
public void onNewToken(String newToken) {
    super.onNewToken(newToken);
    Log.d(TAG, "Refreshed token: " + newToken);
    CustomSharedPreferences customSharedPreferences = new CustomSharedPreferences(this); // giving error on this
    String oldToken = customSharedPreferences.getStringData(FCM_GENERATED_TOKEN);
    sendRegistrationToServer(newToken,oldToken);
}

@Override
public void onMessageReceived(RemoteMessage remoteMessage) {
    super.onMessageReceived(remoteMessage);
    Log.d(TAG, "From: " + remoteMessage.getFrom());

    try {

    } catch (Exception e) {

    }
}}

我真的很想在此服务中将令牌保存到我的应用程序中.请告诉我为什么我无法获得参考/上下文?

I really want to save the token into my app here in this service. Please tell me why I am not able to get the reference/Context ?

更新:我的CustomSharedPrefernces是一个将数据保存到sharedPrefernces中的类

public class CustomSharedPreferences {

public static final String FCM_GENERATED_TOKEN = "FCM_GENERATED_TOKEN";


private static CustomSharedPreferences mCustomSharedPreferences;
private final SharedPreferences sharedPreferences;

public static CustomSharedPreferences getInstance(Context context) {
    if (mCustomSharedPreferences == null) {
        mCustomSharedPreferences = new CustomSharedPreferences(context);
    }
    return mCustomSharedPreferences;
}


public CustomSharedPreferences(Context context) {
    sharedPreferences = context.getSharedPreferences("myApp", Context.MODE_PRIVATE);
}}

更新:

错误:"CustomSharedPreferences中的android.content.context无法应用于com.myprojectname.MyFireBaseMsgAndTokenService"

error: "android.content.context in CustomSharedPreferences can not be applied to com.myprojectname.MyFireBaseMsgAndTokenService"

推荐答案

您可以在此处查看我的firebase通知处理:

You can see my firebase notification handling here:

public UserPreferences(Context context) {
        this.context = context;
        preferences = context.getSharedPreferences(PREF_NAME, Context.MODE_PRIVATE);
    }

您可以简单地使用this或getApplicationContext()来获取上下文

You can use simply use this orgetApplicationContext() to get the context

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