联网会受到网络安全政策限制所以

1.加权限

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

2.res目录下配置安全xml

<?xml version="1.0" encoding="utf-8"?>
<network-security-config xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    tools:ignore="MissingDefaultResource">
    <base-config cleartextTrafficPermitted="true" />
</network-security-config>

3.AndroidManifest.xml下添加

application
        android:networkSecurityConfig="@xml/network_security_config"

通知会受到Android版本限制，作出更改

private Notification getNotification(String title, int progress) {
        String ID = "com.example.service1";	//这里的id里面输入自己的项目的包的路径
        String NAME = "Channel One";
        Intent intent = new Intent(this, ServiceActivity.class);
        PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, intent, 0);
        NotificationCompat.Builder notification; //创建服务对象
        NotificationManager manager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            NotificationChannel channel = new NotificationChannel(ID, NAME, manager.IMPORTANCE_HIGH);
            channel.enableLights(true);
            channel.setShowBadge(true);
            channel.setLockscreenVisibility(Notification.VISIBILITY_PUBLIC);
            manager.createNotificationChannel(channel);
            notification = new NotificationCompat.Builder(this).setChannelId(ID);
        } else {
            notification = new NotificationCompat.Builder(this);
        }
        notification.setContentTitle(title)
                .setContentText(progress+"%")
                .setWhen(System.currentTimeMillis())
                .setSmallIcon(R.mipmap.ic_launcher)
                .setLargeIcon(BitmapFactory.decodeResource(getResources(), R.mipmap.ic_launcher))
                .setContentIntent(pendingIntent)
                .build();
        Notification notification1 = notification.build();
        startForeground(1,notification1);
        return notification1;
    }