Firebase(FCM)如何获取令牌

Question

这是我第一次使用FCM。

我从Firebase/QuickStart-Android下载了一个示例，并安装了FCM QuickStart。但我无法从日志中获得任何令牌，甚至在应用程序中点击日志令牌按钮。

然后我尝试用Firebase控制台发送消息，并设置为目标我的应用程序包名称。我收到短信了。

public class RegistrationIntentService extends IntentService {

    private static final String TAG = "RegIntentService";


    public RegistrationIntentService() {
        super(TAG);
    }

    @Override
    protected void onHandleIntent(Intent intent) {
        String token = FirebaseInstanceId.getInstance().getToken();
        Log.i(TAG, "FCM Registration Token: " + token);
    }
}

public class MyFirebaseInstanceIDService extends FirebaseInstanceIdService {

    private static final String TAG = "MyFirebaseIIDService";

    /**
     * Called if InstanceID token is updated. This may occur if the security of
     * the previous token had been compromised. Note that this is called when the InstanceID token
     * is initially generated so this is where you would retrieve the token.
     */
    // [START refresh_token]
    @Override
    public void onTokenRefresh() {
        // Get updated InstanceID token.
//        String refreshedToken = FirebaseInstanceId.getInstance().getToken();
//        Log.d(TAG, "Refreshed token: " + refreshedToken);
//
//        // TODO: Implement this method to send any registration to your app's servers.
//        sendRegistrationToServer(refreshedToken);
//
        Intent intent = new Intent(this, RegistrationIntentService.class);
        startService(intent);
    }
    // [END refresh_token]

    /**
     * Persist token to third-party servers.
     * <p>
     * Modify this method to associate the user's FCM InstanceID token with any server-side account
     * maintained by your application.
     *
     * @param token The new token.
     */
    private void sendRegistrationToServer(String token) {
        // Add custom implementation, as needed.
    }
}

 Intent intent = new Intent(this, RegistrationIntentService.class);
        startService(intent);

完成以上操作后，您将在logcat中获得令牌。但最后，我找到了一个方便的方法来获取它，只需使用debug模式安装示例应用程序，您就可以在第一次安装时获得令牌。

但是我不知道为什么我安装的时候它不能打印日志。可能和移动系统有关。

为什么我不能收到通知。FireBaseMessagingService.OnMessageReceived未调用sendNotification

Answer 1

我会把这个简短一点。这是检索Firebase令牌的唯一不受反对的方法：

FirebaseInstallations.getInstance().getToken(true).addOnCompleteListener(task -> { 
   // get token 
   String token = task.getResult().getToken();      
})