我已经为API26编写了相同的通知，使用if-else编写了更高和更低的通知，我有一个Alarm_Receiver，在Manifest中，我也编写了（我的Receiver Android名称和Intent Filter以及我的服务android名称）。 API低于26的通知工作正常，但在API 26和API 27中它只在应用程序打开时关闭应用程序时工作，然后在闹钟时我收到错误“应用程序已停止”并通知不会是节目。 你能帮帮我，我该怎么办？
还有一件事 当我的模拟器以API 27启动时，我收到错误“系统没有响应”。关闭应用程序或等待。 但是，如果我等待，那么我的应用程序将运行，当应用程序打开时，我得到通知，但当我关闭应用程序，然后我没有得到通知，我得到一个错误“应用程序已停止”。 仿真器是5.1 WVGA 分辨率480x800和RAM 512。
我不是专业。我是Android Studio的新手。
public int onStartCommand(Intent intent, int flags, int startId) {
if(Build.VERSION.SDK_INT >= 26){
NotificationManager mNotificationManager =
(NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
String idsh = "my_channel_01";
int notificationID = 1;
CharSequence name = getString(R.string.hello_world);
String description = getString(R.string.hello_world);
int importance = NotificationManager.IMPORTANCE_HIGH;
Uri sounduri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
NotificationChannel mChannel = new NotificationChannel(idsh, name, importance);
// Configure the notification channel.
mChannel.setDescription(description);
mChannel.enableLights(true);
mChannel.setLightColor(Color.RED);
mChannel.enableVibration(true);
mChannel.setVibrationPattern(new long[]{100, 200, 300, 400, 500, 400, 300, 200, 400});
mChannel.setLockscreenVisibility(Notification.VISIBILITY_PUBLIC);
assert mNotificationManager != null;
mNotificationManager.createNotificationChannel(mChannel);
Intent resultIntent = new Intent(this, MainActivity.class);
PendingIntent resultPendingIntent =
PendingIntent.getActivity(
this,
0,
resultIntent,
PendingIntent.FLAG_UPDATE_CURRENT
);
Notification notification = new Notification.Builder(this,idsh)
.setContentTitle("Hello World")
.setContentText("Hellooooo")
.setBadgeIconType(R.mipmap.ic_launcher)
.setNumber(5)
.setContentIntent(resultPendingIntent)
.setSmallIcon(R.mipmap.ic_launcher_round)
.setAutoCancel(true)
.build();
assert mNotificationManager != null;
mNotificationManager.notify(notificationID, notification);
Log.i("LocalService", "Received start id " + startId + ": " + intent);
}else{
Uri sounduri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
NotificationCompat.Builder mBuilder =
new NotificationCompat.Builder(this)
.setSmallIcon(R.drawable.ic_launcher_background)
.setSound(sounduri)
.setVibrate(new long[] { 1000, 1000, 1000, 1000, 1000 })
.setContentTitle("Hello World")
.setContentText("Hello World");
Intent resultIntent = new Intent(this, MainActivity.class);
// Because clicking the notification opens a new ("special") activity, there's
PendingIntent resultPendingIntent =
PendingIntent.getActivity(
this,
0,
resultIntent,
PendingIntent.FLAG_UPDATE_CURRENT
);
mBuilder.setContentIntent(resultPendingIntent);
// Sets an ID for the notification
int mNotificationId = 001;
NotificationManager mNotifyMgr =
(NotificationManager) getSystemService(NOTIFICATION_SERVICE);
assert mNotifyMgr != null;
mNotifyMgr.notify(mNotificationId, mBuilder.build());
}
首先我在Logcat中遇到此错误：
android.gms.persistent E/GcmPushIntentOperation: Failed to subscribe to GCM: com.google.android.inputmethod.latin
java.io.IOException: TIMEOUT
at vab.b(:com.google.android.gms@11577470:42)
at vab.a(:com.google.android.gms@11577470:46)
at uzy.b(:com.google.android.gms@11577470:11)
at uzy.a(:com.google.android.gms@11577470:29)
at com.google.android.gms.phenotype.gcmpush.GcmPushIntentOperation.a(:com.google.android.gms@11577470:22)
at com.google.android.gms.phenotype.gcmpush.GcmPushIntentOperation.onHandleIntent(:com.google.android.gms@11577470:6)
at com.google.android.chimera.IntentOperation.onHandleIntent(:com.google.android.gms@11577470:2)
at bwh.run(:com.google.android.gms@11577470:10)
at bwe.run(:com.google.android.gms@11577470:14)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1162)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:636)
at java.lang.Thread.run(Thread.java:764)
和此：
E / ConfigUpdater：忽略更新请求
然后在闹钟时间后一分钟我进入模拟器错误：应用已停止并且在Logcat中：
Process: com.example.standard.alarm, PID: 3903
java.lang.RuntimeException: Unable to start receiver com.example.standard.alarm.Alarm_Receiver: java.lang.IllegalStateException: Not allowed to start service Intent { act=com.demo.FirebaseMessagingReceiveService cmp=com.example.standard.alarm/.RingtonePlayingService }: app is in background uid UidRecord{8d38734 u0a79 RCVR idle change:uncached procs:1 seq(0,0,0)}
at android.app.ActivityThread.handleReceiver(ActivityThread.java:3194)
at android.app.ActivityThread.-wrap17(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1672)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6494)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)
Caused by: java.lang.IllegalStateException: Not allowed to start service Intent { act=com.demo.FirebaseMessagingReceiveService cmp=com.example.standard.alarm/.RingtonePlayingService }: app is in background uid UidRecord{8d38734 u0a79 RCVR idle change:uncached procs:1 seq(0,0,0)}
at android.app.ContextImpl.startServiceCommon(ContextImpl.java:1518)
at android.app.ContextImpl.startService(ContextImpl.java:1474)
at android.content.ContextWrapper.startService(ContextWrapper.java:649)
at android.content.ContextWrapper.startService(ContextWrapper.java:649)
at com.example.standard.alarm.Alarm_Receiver.onReceive(Alarm_Receiver.java:15)
at android.app.ActivityThread.handleReceiver(ActivityThread.java:3187)
答案 0 :(得分：0)
你得到Not allowed to start service Intent when app is in background异常原因来自API级别26（Oreo）android已对后台服务执行施加限制。你可以在这里阅读相同的Background executions limit。
您可以使用startForegroundService() startforeground在前台启动服务，但在获得ANR之前必须先启动服务。
其他选项是使用JobScheduler JobScheduler并使用JobScheduler替换您的服务以执行所需的任务。