android - 在 Android 中显示推送通知

Question

我想创建一个具有推送通知功能的应用。

我所做的是在谷歌中注册应用

并存储来自app的resisted device id

并从服务器发送通知。

一切正常。

我向已注册的设备发送推送。

而且我不知道在推送到来时如何显示推送通知。

Answer 1

您需要实现 GcmListenerService ，下面是一个例子:

/**
 * Service used for receiving GCM messages. When a message is received this service will log it.
 */
public class GcmService extends GcmListenerService {
  private final int PN_ID = 993;

  Booking mBooking;

  private static final String TYPE = "type";
  private static final String TITLE = "title";
  private static final String MESSAGE = "body";

  private NotificationManager mNotificationManager;

  public GcmService() {

  }

  @Override
  public void onMessageReceived(String from, final Bundle data) {

    String type = data.getString(TYPE, "");
    final String title = data.getString(TITLE, "");
    final String message = data.getString(MESSAGE, "");

    if (title.length() > 0 || message.length() > 0) {
      sendNotification(PN_ID, title, message);
    }
  }

  @Override
  public void onDeletedMessages() {
    sendNotification(PN_ID, "Deleted messages on server", "");
  }

  @Override
  public void onMessageSent(String msgId) {
    sendNotification(PN_ID, "Upstream message sent. Id=" + msgId, "");
  }

  @Override
  public void onSendError(String msgId, String error) {
    sendNotification(PN_ID, "", "Upstream message send error. Id=" + msgId + ", error" + error);
  }

  // Post a notification indicating whether a doodle was found.
  private void sendNotification(int notificationId, String title, String msg) {
    mNotificationManager = (NotificationManager)
        this.getSystemService(Context.NOTIFICATION_SERVICE);


    PendingIntent contentIntent = PendingIntent.getActivity(this, 0,
        new Intent(this, MainActivity.class), 0);


    NotificationCompat.Builder mBuilder =
        new NotificationCompat.Builder(this)
            .setSmallIcon(R.mipmap.ic_launcher)
            .setContentTitle(title)
            .setStyle(new NotificationCompat.BigTextStyle().bigText(msg))
            .setContentText(msg)
            .setAutoCancel(true);


    mBuilder.setContentIntent(contentIntent);
    mNotificationManager.notify(notificationId, mBuilder.build());
  }


}

在你的manifest里面注册它<application>和其他一样Service

    <service
        android:name=".services.GcmService"
        android:exported="false">
        <intent-filter>
            <action android:name="com.google.android.c2dm.intent.RECEIVE"/>
        </intent-filter>
    </service>

您至少需要这些权限，我怀疑您甚至可能需要 WAKE_LOCK .

<!-- PUSH NOTIFICATIONS -->
<uses-permission android:name="com.google.android.c2dm.permission.RECEIVE"/>

<permission
    android:name="au.com.myapp.permission.C2D_MESSAGE"
    android:protectionLevel="signature"/>

<uses-permission android:name="au.com.myapp.permission.C2D_MESSAGE"/>

在此设置中，您发送到 GCM 服务的负载将如下所示:

{       
  "registration_ids":[],
  "data": {
    "title" : "Hello",
    "message" : "World",
  } 
}

在哪里registration_ids是您要将消息发送到的设备，data Bundle 中将交付给您的是什么.