Question

我在从GCM Server收到通知消息时遇到问题。设备在没有空闲或处于运行状态时会正常收到通知但是当设备空闲10-15分钟时设备无法获得通知而且全部已注册的设备未从GCM服务器获取通知。如何解决此问题？

Answer 1

通常情况下，您的应用需要在睡眠时唤醒。

将此信息放入清单文件中，以便在收到邮件时唤醒您的设备
```
<uses-permission android:name="android.permission.WAKE_LOCK" />
```

添加java类名称WakeLocker.java

public abstract class WakeLocker {
private static PowerManager.WakeLock wakeLock;

public static void acquire(Context context) {
    if (wakeLock != null) wakeLock.release();

    PowerManager pm = (PowerManager) context.getSystemService(Context.POWER_SERVICE);
    wakeLock = pm.newWakeLock(PowerManager.FULL_WAKE_LOCK |
        PowerManager.ACQUIRE_CAUSES_WAKEUP |
        PowerManager.ON_AFTER_RELEASE, "WakeLock");
    wakeLock.acquire();
    }

    public static void release() {
        if (wakeLock != null) wakeLock.release(); wakeLock = null;
    }
}

调用可能在您的MainActivity.java中的'private final BroadcastReceiver mHandleMessageReceiver = new BroadcastReceiver（）'中的上述代码

  private final BroadcastReceiver mHandleMessageReceiver = new BroadcastReceiver() {
  @Override
  public void onReceive(Context context, Intent intent) {
    String newMessage = intent.getExtras().getString(EXTRA_MESSAGE);
    // Waking up mobile if it is sleeping
    WakeLocker.acquire(getApplicationContext());

    /**
     * Take appropriate action on this message
     * depending upon your app requirement
     * For now i am just displaying it on the screen
     * */

    // Showing received message
    lblMessage.append(newMessage + "\n");           
    Toast.makeText(getApplicationContext(), "New Message: " + newMessage, Toast.LENGTH_LONG).show();

    // Releasing wake lock
    WakeLocker.release();
}
};

感谢This source

希望这会有所帮助

Android GCM不向设备发送通知消息

1 个答案: