android8.0以上版本的前台服务

第一步申请权限：

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

第二步：更改 myService

public class MyService extends Service {

    private static final String TAG="MyService";
    private static final String ID="channel_1";
    private static final String NAME="前台服务";

    private DownloadBinder mBinder = new DownloadBinder();

    class DownloadBinder extends Binder {

        public void startDownload(){
            Log.d("MyService", "startDownload executed");
        }
        public int getProcess(){
            Log.d("Myservice", "getProgredd executed");
            return 0;
        }
    }

    public MyService() {
    }

    @Override
    public IBinder onBind(Intent intent) {
        // TODO: Return the communication channel to the service.
        return mBinder;
    }

    @Override
    public void onCreate() {
        super.onCreate();
        Log.d("MyService", "onCreate executed");
        if(Build.VERSION.SDK_INT>=26){
            setForeground();
        }else{

        }

    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        Log.d("MyService", "onStartCommand executed");
        return super.onStartCommand(intent, flags, startId);
    }

    @Override
    public void onDestroy() {
        Log.d("MyService", "onDestroy executed");
        super.onDestroy();
    }
    @TargetApi(26)
    private void setForeground(){
        NotificationManager manager=(NotificationManager)getSystemService (NOTIFICATION_SERVICE);
        NotificationChannel channel=new NotificationChannel (ID,NAME,NotificationManager.IMPORTANCE_HIGH);
        manager.createNotificationChannel (channel);
        Notification notification=new Notification.Builder (this,ID)
                .setContentTitle ("收到一条重要通知")
                .setContentText ("这是重要通知")
                .setSmallIcon (R.mipmap.ic_launcher)
                .setLargeIcon (BitmapFactory.decodeResource (getResources (),R.mipmap.ic_launcher))
                .build ();
        startForeground (1,notification);
    }
}

 第三步，在启动服务时，加

 if (Build.VERSION.SDK_INT >= 26) {
                    //android8.0以上通过startForegroundService启动service
                    startForegroundService(startIntent);
                } else {
                    startService(startIntent);
                }