Question

这是我第一次使用FCM，我在android studio中创建了一个新项目，然后点击了“工具”，我选择了Firebase，I followed all the steps in this window

and I copied and pasted these blocks of code exactly in the same location as mentioned

这是我的Java代码

public class ZeftToken extends FirebaseInstanceIdService {

@Override
public void onTokenRefresh() {
    // Get updated InstanceID token.
    String refreshedToken = FirebaseInstanceId.getInstance().getToken();
    Log.d("zeft", "Refreshed token: " + refreshedToken);

}
}

public class MainActivity extends AppCompatActivity {

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

}
}

这是我的清单文件：

<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:roundIcon="@mipmap/ic_launcher_round"
    android:supportsRtl="true"
    android:theme="@style/AppTheme">
    <activity android:name=".MainActivity">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>

    <service
        android:name=".ZeftToken">
        <intent-filter>
            <action android:name="com.google.firebase.INSTANCE_ID_EVENT"/>
        </intent-filter>
    </service>
</application>

当我运行应用程序时，我没有在logcat中获取令牌，而且它完全丢失了。我不知道出了什么问题。

Answer 1

我用下面的这个函数解决了我的解决方案；

 public void savePushToken(){

   if (!settings.hasData(Keys.pushTokenSaved) ){

       FirebaseMessaging messaging =  FirebaseMessaging.getInstance();
        messaging.getToken().addOnSuccessListener(s -> {
            Log.d("ON TOKEN",s);
            pushToken = s;
            JSONObject params = new JSONObject();
            JSONObject info = new JSONObject();
            try {

                info.put("os","android");
                info.put( "framework", "flutter");
                info.put( "cihaz_bilgisi", new JSONObject());

                params.put("token",pushToken);
                params.put("device_info",info);

            } catch (JSONException e) {
                e.printStackTrace();
            }


            NetworkHelper.request(MyMethod.put, Links.savePushToken,  params, false, false,
                    response->{
                        Log.d("PUSH_REQUEST",response.toString());
                        if (response.has("successful")||response.optString("message").contains("Integrity constraint violation: 1062 Duplicate entry")) {
                            settings.setBool(Keys.pushTokenSaved, true);
                        }
                    });
        });





      }
    }

Answer 2

也许您已经在之前的应用实例中收到了令牌。方法onTokenRefresh仅在创建或更新时被调用。它不会在所有应用程序实例中执行。清除应用数据或卸载应用并再次运行，以便创建新令牌，您可以在日志中看到它。

确保将收到的令牌存储在共享首选项或数据库中以备将来使用。

Answer 3

如果其他好的话。（我希望你有fcm服务提供的json文件？）只需移动

FirebaseInstanceId.getInstance().getToken();

例如您的应用程序或主要活动

如果你有错误（空指针异常）而不是firebase未初始化。检查againe教程。并且不要忘记google-json

Answer 4

参考Get started with Firebase

按指定交叉检查google-service.json的文件路径

启动应用程序（主要活动）时，检查控制台是否有FCM令牌

Android清单

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="in.sdev.android.stackoverflow">

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

        <service
            android:name=".firebase.MyFirebaseInstanceIDService">
            <intent-filter>
                <action android:name="com.google.firebase.INSTANCE_ID_EVENT"/>
            </intent-filter>
        </service>
        <service
            android:name=".firebase.MyFirebaseMessagingService">
            <intent-filter>
                <action android:name="com.google.firebase.MESSAGING_EVENT"/>
            </intent-filter>
        </service>

    </application>

</manifest>

主要活动

package in.sdev.android.stackoverflow;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;

import com.google.firebase.iid.FirebaseInstanceId;

public class MainActivity extends AppCompatActivity {
    public static String TAG = "MainActivity";

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

        String refreshedToken = FirebaseInstanceId.getInstance().getToken();
        Log.d(TAG, "FCM token: " + refreshedToken);
    }
}

Firebase软件包示例

<强> MyFirebaseInstanceIDService.java

package in.sdev.android.stackoverflow.firebase;

import android.util.Log;

import com.google.firebase.iid.FirebaseInstanceId;
import com.google.firebase.iid.FirebaseInstanceIdService;
import static android.content.ContentValues.TAG;

public class MyFirebaseInstanceIDService extends FirebaseInstanceIdService {

    @Override
    public void onTokenRefresh() {
        // Get updated InstanceID token.
        String refreshedToken = FirebaseInstanceId.getInstance().getToken();
        Log.d(TAG, "Refreshed token: " + refreshedToken);

        // If you want to send messages to this application instance or
        // manage this apps subscriptions on the server side, send the
        // Instance ID token to your app server.
        sendRegistrationToServer(refreshedToken);
    }

    public void sendRegistrationToServer(String token){
        Log.v("FirebaseService", "Token " + token);
    }
}

<强> MyFirebaseMessagingService.java

package in.sdev.android.stackoverflow.firebase;

import android.util.Log;

import com.google.firebase.messaging.FirebaseMessagingService;
import com.google.firebase.messaging.RemoteMessage;

public class MyFirebaseMessagingService extends FirebaseMessagingService {
    public static String TAG = "MyFirebaseMsgService";

    @Override
    public void onMessageReceived(RemoteMessage remoteMessage) {
        // ...

        // TODO(developer): Handle FCM messages here.            
        Log.d(TAG, "From: " + remoteMessage.getFrom());

        // Check if message contains a data payload.
        if (remoteMessage.getData().size() > 0) {
            Log.d(TAG, "Message data payload: " + remoteMessage.getData());
        }

        // Check if message contains a notification payload.
        if (remoteMessage.getNotification() != null) {
            Log.d(TAG, "Message Notification Body: " + remoteMessage.getNotification().getBody());
        }

        // Also if you intend on generating your own notifications as a result of a received FCM
        // message, here is where that should be initiated. See sendNotification method below.
    }
}

希望这有帮助

Answer 5

更新

扩展FirebaseMessagingService
使用onNewToken代替onTokenRefresh

getToken()方法现已弃用

 @Override
public void onNewToken(String token) {
    Log.d(TAG, "Refreshed token: " + token);

    // If you want to send messages to this application instance or
    // manage this apps subscriptions on the server side, send the
    // Instance ID token to your app server.
    sendRegistrationToServer(token);
}

如果要在活动中检索令牌使用下面的代码.getInstanceId()代替.getToken()方法

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

     }
 });

如何在android studio中获取（FCM）令牌？

5 个答案: