Android8.0后启动Service服务

参考网址：https://blog.csdn.net/yt_42370304/article/details/105842170

https://blog.csdn.net/sinat_20059415/article/details/80584487

Android8.0后不再允许后台service直接通过startService方式去启动

启动方式

Intent intent = new Intent(this, MyService.class);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
    startForegroundService(intent);
} else {
    startService(intent);
}

MyService

public class MyService extends Service {

    @Override
    public void onCreate() {
        super.onCreate();

        NotificationManager notificationManager = (NotificationManager)             
        getSystemService(Context.NOTIFICATION_SERVICE);
        //创建NotificationChannel
        if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.O){
            NotificationChannel channel = new NotificationChannel(NOTIFICATION_ID,     
                      NOTIFICATION_NAME, NotificationManager.IMPORTANCE_HIGH);
            notificationManager.createNotificationChannel(channel);
        }
        startForeground(1,getNotification());
    }
    //这个必须加，不能设置为null
    private Notification getNotification() {
        Notification.Builder builder = new Notification.Builder(this)
                .setSmallIcon(R.drawable.ic_launcher_background)
                .setContentTitle("测试服务")
                .setContentText("我正在运行");//标题和内容可以不加
        //设置Notification的ChannelID,否则不能正常显示
        if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            builder.setChannelId(NOTIFICATION_ID);
        }
        Notification notification = builder.build();
        return notification;
    }
}

说明：

测试发现Android8.0后如果用startService启动服务，应用退到后台后此服务一会儿就会被杀掉；如果用startForegroundService启动服务，并且添加了消息通知后，应用后台挂起则不会被系统杀掉