报错一

java.lang.RuntimeException:
Unable to start receiver 包名.MainReceiver:
java.lang.IllegalStateException:
Not allowed to start service Intent { cmp=包名/.MainService }:
app is in background uid UidRecord{90638 u0a10 RCVR idle change:

Android o需要适配服务

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
context.startForegroundService(mIntent);
} else {
context.startService(mIntent);
}

报错二

android.app.RemoteServiceException:
Bad notification for startForeground:
java.lang.RuntimeException:
invalid channel for service notification:
Notification(channel=null pri=0
contentView=null vibrate=null sound=null
defaults=0x0 flags=0x40 color=0x00000000
vis=PRIVATE semFlags=0x0 semPriority=0 semMissedCount=0)

Android o需要适配通知channel

参考：

在Android 8.0中使用Notification中发生 Bad notification for startForeground错误

一、android8.0 添加了前台所需要的权限

添加权限如下：

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

二、启动服务方式适配 ：

Intent mIntent = new Intent(context,MainService.class);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
context.startForegroundService(mIntent);
} else {
context.startService(mIntent);
}

三、startForeground启动通知

//service的onCreate调用
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
super.onStartCommand(intent, flags, startId);
String CHANNEL_ID = "CHANNEL_ID";
String CHANNEL_NAME = "CHANNEL_ID";
NotificationChannel notificationChannel;
//进行8.0的判断
if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {
notificationChannel = new NotificationChannel(
CHANNEL_ID,
CHANNEL_NAME,
NotificationManager.IMPORTANCE_HIGH
);
notificationChannel.enableLights(true);
notificationChannel.setLightColor(Color.RED);
notificationChannel.setShowBadge(true);
notificationChannel.setLockscreenVisibility(Notification.VISIBILITY_PUBLIC);
NotificationManager manager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
manager.createNotificationChannel(notificationChannel);
}
intent = new Intent(Intent.ACTION_VIEW, Uri.parse("https://www.jianshu.com/p/14ba95c6c3e2"));
PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, intent, 0);
Notification notification = null;
if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {
notification = new Notification.Builder(this, CHANNEL_ID)
.setTicker("Nature")
.setSmallIcon(R.mipmap.ic_launcher)
.setContentTitle("这是一个测试标题")
.setContentIntent(pendingIntent)
.setContentText("这是一个测试内容")
.build();
}
notification.flags |= Notification.FLAG_NO_CLEAR;
//在service里再调用startForeground方法，不然就会出现ANR
startForeground(1, notification);
Log.e(TAG, "onStartCommand");
return Service.START_STICKY;
}

简化：

只通知栏显示

//service的onCreate调用
private void notification() {
Notification notification = null;
if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {
NotificationChannel channel = new NotificationChannel(
CHANNEL_ID,
CHANNEL_NAME,
NotificationManager.IMPORTANCE_LOW
);
NotificationManager manager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
manager.createNotificationChannel(channel);
notification = new Notification.Builder(this, CHANNEL_ID).build();
}
//在service里再调用startForeground方法，不然就会出现ANR
startForeground(1, notification);
}

最后

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