Android8.0後啟動Service服務

參考網址：https://blog.csdn.net/yt_42370304/article/details/105842170

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

https://blog.csdn.net/luo_boke/article/details/102696097

Android8.0後不再允許背景service直接通過startService方式去啟動

啟動方式

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);
        //建立NotificationChannel
        if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.O){
            NotificationChannel channel = new NotificationChannel(NOTIFICATION_ID,     
                      NOTIFICATION_NAME, NotificationManager.IMPORTANCE_HIGH);
            notificationManager.createNotificationChannel(channel);
        }
        //Android9.0會報Caused by: java.lang.SecurityException: Permission Denial:     
        //android.permission.FOREGROUND_SERVICE---AndroidManifest.xml中需要申請此權限
        startForeground(1,getNotification());
    }
    //這個必須加，不能設定為null
    private Notification getNotification() {
        Notification.Builder builder = new Notification.Builder(this)
                .setSmallIcon(R.drawable.ic_launcher_background)
                .setContentTitle("測試服務")
                .setContentText("我正在運作");//标題和内容可以不加
        //設定Notification的ChannelID,否則不能正常顯示
        if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            builder.setChannelId(NOTIFICATION_ID);
        }
        Notification notification = builder.build();
        return notification;
    }
}
           

說明：

測試發現Android8.0後如果用startService啟動服務，應用退到背景後此服務一會兒就會被殺掉；如果用startForegroundService啟動服務，并且添加了消息通知後，應用背景挂起則不會被系統殺掉