添加服务以发送通知

在本部分中,我们将使用 Android Notification Manager. Notification manager 用于通知用户发生的事件。
下面是您如何告知用户后台发生了某些情况:

  • Launch Android Studio
  • 打开 ACSPushTutorial 项目
  • 展开项目结构
  • 右键单击包文件夹(com.example.acspushtutorial)和 New ->Java Class
  • 将此类命名为 MyService 确保它能够延长 FirebaseMessagingService
  • 创建 sendNotification 方法。 在此方法中,您需要使用 NotificationCompat.Builder 对象。 要显示通知,请调用 NotificationManagerCompat.notify(),为其传递通知和结果的唯一ID NotificationCompat.Builder.build().
package com.example.pushmessaging;
import android.app.NotificationChannel;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.media.RingtoneManager;
import android.net.Uri;
import android.os.Build;
import android.util.Log;

import androidx.core.app.NotificationCompat;

import com.google.firebase.messaging.FirebaseMessagingService;
import com.google.firebase.messaging.RemoteMessage;

import java.util.Map;

public class MyService extends FirebaseMessagingService {
@Override
public void onMessageReceived(RemoteMessage remoteMessage)
{
Map<String,String> data  = remoteMessage.getData();
Log.d("data payload: ", data.toString());
sendNotification(remoteMessage);
}


private void sendNotification(RemoteMessage message) {
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);

String channelId = "0";
Uri defaultSoundUri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
NotificationCompat.Builder notificationBuilder =
        new NotificationCompat.Builder(this, channelId)
                .setSmallIcon(R.drawable.ic_launcher_background)
                .setContentTitle("Message from AEM")
                .setContentText(message.getData().get("body"))
                .setAutoCancel(true)
                .setSound(defaultSoundUri)
                .setContentIntent(pendingIntent);

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

// Since android Oreo notification channel is needed.
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
    NotificationChannel channel = new NotificationChannel(channelId,
            "Channel human readable title",
            NotificationManager.IMPORTANCE_DEFAULT);
    notificationManager.createNotificationChannel(channel);
}

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

修改 AndroidManifest.xml

将创建的服务添加到 AndroidManifest.xml. 最后 AndroidManifest.xml 应如下所示:

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

    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

    <application
        android:name=".MainApp"
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <service
            android:name=".MyService"
            android:exported="false">
            <intent-filter>
                <action android:name="com.google.firebase.MESSAGING_EVENT" />
            </intent-filter>
        </service>

        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

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

</manifest>

运行应用程序

通过单击 绿色箭头 或 Run 菜单。

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