android - GcmListenerService onMessageReceived 仅在应用程序处于前台时调用

Question

我有以下 list -

<service
    android:name=".RegistrationIntentService"
    android:exported="false" />

<service
    android:name=".TestGcmListenerService"
    android:exported="false">
    <intent-filter>
        <action android:name="com.google.android.c2dm.intent.RECEIVE" />
        <category android:name="com.example.test" />
    </intent-filter>
</service>

<service
    android:name=".RegistrationIDListenerService"
    android:exported="false">
    <intent-filter>
        <action android:name="com.google.android.gms.iid.InstanceID" />
    </intent-filter>
</service>

<receiver
    android:name="com.google.android.gms.gcm.GcmReceiver"
    android:exported="true"
    android:permission="com.google.android.c2dm.permission.SEND">
    <intent-filter>
        <action android:name="com.google.android.c2dm.intent.RECEIVE" />

        <category android:name="com.example.test" />
    </intent-filter>
</receiver>

并遵循 onMessageReceived 方法 -

@Override
    public void onMessageReceived(String from, Bundle data) {
        ObjectMapper objectMapper = new ObjectMapper();
        Message message;
        try {
            message = objectMapper.readValue(String.valueOf(data.get("message")), Message.class);
            MessageNotification.notify(this, message, 1);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

发生的事情是，onMessageReceived 仅在应用程序处于前台时才被调用。否则它不会被调用并且不会显示通知。当我打开应用程序时，所有通知都会立即显示。

如果锁定并执行工作，GcmListenereService 不会唤醒设备吗？如何解决这个问题？

Answer 1

Google 搜索并设法在 github 上找到这个线程，它与您关注的问题几乎相同，其中 onMessageReceived() is only called when app is on foreground .原因是因为只发送了通知消息。根据线程中包含的描述:

Notification Messages - these are intended to generate a notification with no intermediate processing by the application. They only hit onMessageReceived if the app is running.

Data Messages - these are intended to silently pass data to the app's messaging service. They hit onMessageReceived even if the app is in the background. The service may then choose to generate a notification using the normal system notification APIs, or it may choose to handle the message silently.

我认为您正在发送通知消息，同时期待数据消息的行为开始。

这也是 SO post of Shiprack在github线程中提到。希望这可以帮助。祝你好运。