如何使安卓FCM通知服务始终在后台运行?

Question

我目前正在开发一个应用程序，该应用程序可以使用主题来通知用户新的更改。它实际上运行得很好，但前提是应用程序当前正在运行。如果应用在后台或关闭，则不会推送任何通知。这就是我想要改变的。应用/通知服务应全部在后台运行。

我已经准备好在SO上找到了一些解决方案，但是它们不是服务器-客户端解决方案(带有FCM)还是它们没有真正起作用。

这是我的服务器上运行的FCM/通知类：

public static void pushFCMNotification(String DeviceIdKey, String title, String content) throws Exception {
String authKey = AUTH_KEY_FCM;
String FMCurl = API_URL_FCM;
URL url = new URL(FMCurl);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setUseCaches(false);
conn.setDoInput(true);
conn.setDoOutput(true);
conn.setRequestMethod("POST");
conn.setRequestProperty("Authorization", "key=" + authKey);
conn.setRequestProperty("Content-Type", "application/json");
JSONObject data = new JSONObject();
data.put("to", DeviceIdKey.trim());
JSONObject info = new JSONObject();
info.put("title", title); // Notification title
info.put("content-text", content); // Notification body
info.put("click_action", ".MainActivity");
data.put("data", info);

System.out.println(data.toString());
OutputStreamWriter wr = new OutputStreamWriter(conn.getOutputStream());
wr.write(data.toString());
wr.flush();
wr.close();

int responseCode = conn.getResponseCode();
System.out.println("Response Code : " + responseCode);
BufferedReader in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
String inputLine;
StringBuffer response = new StringBuffer();
while ((inputLine = in.readLine()) != null) {
response.append(inputLine);
}
in.close();
}
//test method
public static void main(String[] args) throws Exception {
DateFormat dateFormat = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss");
Date date = new Date();
FCMNotification.pushFCMNotification("/topics/general",   dateFormat.format(date), "dracky");
}
}

这些是我在Android上运行的FCM类：

1. FCM_Instance_ID_Service.java

public class FCM_Instance_ID_Service 扩展了 FirebaseInstanceIdService { final 字符串 tokenPpreferencesKey = "fcm_token";

final static String infoTopicName = "info";
private static final String REG_TOKEN = "REG_TOKEN";
@Override
public void onTokenRefresh() {
super.onTokenRefresh();
SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);
sharedPreferences.edit().putString(tokenPreferenceKey, FirebaseInstanceId.getInstance().getToken()).apply();
FirebaseMessaging.getInstance().subscribeToTopic(infoTopicName);
}
}

2. FCM_Messaging_Service.java

public class FCM_Messaging_Service extends FirebaseMessagingService {
@Override
public void onMessageReceived(RemoteMessage remoteMessage) {
super.onMessageReceived(remoteMessage);
if (remoteMessage.getFrom().equals("/topics/" + FCM_Instance_ID_Service.infoTopicName)) {
displayNoification(remoteMessage.getData().get("title"), remoteMessage.getData().get("content-text"), this);
} else {
displayNoification(remoteMessage.getData().get("title"), remoteMessage.getData().get("content-text"), this);
}
Vibrator v = (Vibrator) getSystemService(Context.VIBRATOR_SERVICE);
// Vibrate for 500 milliseconds
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
v.vibrate(VibrationEffect.createOneShot(500, VibrationEffect.DEFAULT_AMPLITUDE));
} else {
//deprecated in API 26
v.vibrate(500);
}
//startAlarm(true, false);
}

@SuppressLint("NewApi")
public void displayNoification(String title, String contentText, Context context) {
Notification notification = null;
notification = new Notification.Builder(this)
.setContentTitle(title)
.setContentText(contentText)
.setSmallIcon(R.mipmap.ic_launcher_round)
.setLights(Color.RED, 3000, 3000)
.setSound(Uri.parse("android.resource://"
+ context.getPackageName() + "/" + R.raw.alarm))
.setLargeIcon(BitmapFactory.decodeResource(
getResources(), R.mipmap.ic_launcher))
.build();

NotificationManager notificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
notificationManager.notify(14, notification);
}
}

这是我的清单.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="net.ddns.kodiakscloud.fastalker">
<uses-permission android:name="android.permission.VIBRATE" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.WAKE_LOCK" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
<application
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">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
<intent-filter>
<action android:name=".MainActivity" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
<service android:name=".FCM_Messaging_Service">
<intent-filter>
<action android:name="com.google.firebase.MESSAGING_EVENT" />
</intent-filter>
</service>
<service android:name=".FCM_Instance_ID_Service">
<intent-filter>
<action android:name="com.google.firebase.INSTANCE_ID_EVENT" />
</intent-filter>
</service>
<activity android:name=".BrowserActivity" />
<activity android:name=".ReviewActivity" />
<activity android:name=".WatchListActivity"></activity>
</application>
</manifest>

有人有想法吗？

Answer 1

我认为这不是FCM的问题，也不是通知服务的问题。我认为这是某些设备的问题。在类似的帖子中查看我的答案，也许这对您有所帮助。

在安卓上未收到通知