Firebase Cloud Messaging android 项目不发送推送通知

Question

我正在尝试开发一个应用程序，其中服务器必须每 5 秒向所有 android 设备运行发送通知给该应用程序。我决定使用 (Google) Firebse Cloud Messaging 发送通知，所以我先尝试了指南的示例项目

https://firebase.google.com/docs/notifications/android/console-audience

但我无法让它工作。我遵循了所有的指示。我已经发布了我使用的代码。我还做了 文件 --> 项目结构 --> 通知 --> 选中了框 Google 云消息传递 。我在 android 5 设备上试用了该应用程序。

当我打开 Firebase 控制台并发送通知时，我在日志中看到刷新的令牌（来自 MyFirebaseInstanceIDService class，方法 onTokenRefresh()），但是当我运行再次，并通过复制和粘贴令牌向单个设备发送通知，没有任何反应。此外，当我从控制台向 user segment 发送通知时，什么也没有发生。

我还尝试了来自同一网站的 Firebase 的相应 ios 示例项目，它在 iphone（所有通知已发送）上运行良好。我在这里遗漏了什么吗？

public class MyFirebaseInstanceIDService extends FirebaseInstanceIdService {

private static final String TAG = "MyFirebaseIIDService";

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

    sendRegistrationToServer(refreshedToken);
}

private void sendRegistrationToServer(String token) {
    // TODO: Implement this method to send token to your app server.
}
}

MyFirebaseMessagingService :

public class MyFirebaseMessagingService extends FirebaseMessagingService {

private static final String TAG = "MyFirebaseMsgService";

@Override
public void onMessageReceived(RemoteMessage remoteMessage) {

    Log.d(TAG, "From: " + remoteMessage.getFrom());

    //Toast.makeText(getApplicationContext(),"FROM "+remoteMessage.getFrom(),Toast.LENGTH_LONG).show();
    // Check if message contains a data payload.
    if (remoteMessage.getData().size() > 0) {
        Log.d(TAG, "Message data payload: " + remoteMessage.getData());
        //Toast.makeText(getApplicationContext(),"MESSAGE: "+remoteMessage.getData(),Toast.LENGTH_LONG).show();
    }

    // Check if message contains a notification payload.
    if (remoteMessage.getNotification() != null) {
        //MainActivity.TestMethod();
        Log.d(TAG, "Message Notification Body: " + remoteMessage.getNotification().getBody());
        //Toast.makeText(getApplicationContext(),"MESSAGE: "+remoteMessage.getData(),Toast.LENGTH_LONG).show();
    }

    // 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.
 sendNotification(remoteMessage.getNotification().getBody());
}

private void sendNotification(String messageBody) {
    Intent intent = new Intent(this, MainActivity.class);
    intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
    PendingIntent pendingIntent = PendingIntent.getActivity(this, 0 /* Request code */, intent,
            PendingIntent.FLAG_ONE_SHOT);

    Uri defaultSoundUri= RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
    NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(this)
            .setSmallIcon(R.drawable.ic_stat_ic_notification)
            .setContentTitle("FCM Message")
            .setContentText(messageBody)
            .setAutoCancel(true)
            .setSound(defaultSoundUri)
            .setContentIntent(pendingIntent);

    NotificationManager notificationManager =
            (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);

    notificationManager.notify(0 /* ID of notification */, notificationBuilder.build());
}
}

主要activity:

public class MainActivity extends AppCompatActivity {

private static final String TAG = "MainActivity";

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

    if (getIntent().getExtras() != null) {
        for (String key : getIntent().getExtras().keySet()) {
            String value = getIntent().getExtras().getString(key);
            Log.d(TAG, "Key: " + key + " Value: " + value);
        }
    }

    Button subscribeButton = (Button) findViewById(R.id.subscribeButton);
    subscribeButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            // [START subscribe_topics]
            FirebaseMessaging.getInstance().subscribeToTopic("news");
            // [END subscribe_topics]

            // Log and toast
            String msg = getString(R.string.msg_subscribed);
            Log.d(TAG, msg);
            Toast.makeText(MainActivity.this, msg, Toast.LENGTH_SHORT).show();
        }
    });

    Button logTokenButton = (Button) findViewById(R.id.logTokenButton);
    logTokenButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            // Get token
            String token = FirebaseInstanceId.getInstance().getToken();

            // Log and toast
            String msg = getString(R.string.msg_token_fmt, token);
            Log.d(TAG, msg);
            Toast.makeText(MainActivity.this, msg, Toast.LENGTH_SHORT).show();
        }
    });
}
}

和build.gradle（项目消息）：

    // Top-level build file where you can add configuration options commonto             `all sub-projects/modules.`

buildscript {
    repositories {
        jcenter()
        mavenLocal()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:2.1.3'
        classpath 'com.google.gms:google-services:3.0.0'

        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

allprojects {
    repositories {
        jcenter()
        mavenLocal()
    }
}

和 build.gradle（模块应用）：

apply plugin: 'com.android.application'

android {
    compileSdkVersion 24
    buildToolsVersion "24.0.0"

    defaultConfig {
        applicationId "com.google.firebase.quickstart.fcm"
        minSdkVersion 15
        targetSdkVersion 24
        versionCode 1
        versionName "1.0"

        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }

    packagingOptions {
        exclude 'LICENSE.txt'
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])

    // Testing dependencies
    androidTestCompile 'com.android.support.test.espresso:espresso-core:2.1'
    androidTestCompile 'com.android.support.test:runner:0.2'
    androidTestCompile 'com.android.support:support-annotations:24.2.0'
    compile 'com.android.support:appcompat-v7:24.2.0'
    compile 'com.google.firebase:firebase-messaging:9.4.0'
    compile 'com.google.firebase:firebase-core:9.4.0'
    compile 'com.google.android.gms:play-services-gcm:9.4.0'
    compile 'com.android.support:design:24.2.0'
}

apply plugin: 'com.google.gms.google-services'

...这是清单文件：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.google.firebase.quickstart.fcm">

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

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

        <!-- [START firebase_service] -->
        <service android:name=".MyFirebaseMessagingService">
            <intent-filter>
                <action android:name="com.google.firebase.MESSAGING_EVENT" />
            </intent-filter>
        </service>
        <!-- [END firebase_service] -->
        <!-- [START firebase_iid_service] -->
        <service android:name=".MyFirebaseInstanceIDService">
            <intent-filter>
                <action android:name="com.google.firebase.INSTANCE_ID_EVENT" />
            </intent-filter>
        </service>
        <!-- [END firebase_iid_service] -->
        <activity
            android:name=".ResultActivity"
            android:label="@string/title_activity_result"
            android:theme="@style/AppTheme.NoActionBar"></activity>
    </application>

</manifest>

Answer 1

可能是您正在尝试在应用程序处于前台时接收通知。请确保它在后台，然后重试。否则，您需要按照程序在您的应用处于前台时获得通知。

来自 Firebase 文档： https://firebase.google.com/docs/cloud-messaging/android/receive

Firebase notifications behave differently depending on the foreground/background state of the receiving app. If you want foregrounded apps to receive notification messages or data messages, you’ll need to write code to handle the onMessageReceived callback.

正在发送通知消息：https://firebase.google.com/docs/cloud-messaging/android/first-message

Send a notification message

Install and run the app on the target device.

Make sure the app is in the background on the device.

Open the Notifications tab of the Firebase console and select New Message.

Enter the message text.

Select Single Device for the message target.

In the field labeled FCM Registration Token, enter the registration token you obtained in a previous section of this guide.

Answer 2

我终于找到问题所在了。似乎 json 文件不适合您在 Firebase 控制台创建项目的示例 project.When，它会生成一个 json 文件，应该下载并放置到应用程序文件夹。当我为自己的应用程序（而不是示例项目）创建项目并重新执行所有操作（并将控制台生成的 json 文件放在应用程序文件夹中）时，它工作正常。

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