ITブログ時々なんでもブログ

１．バックグラウンドサービスを作成する

[Service(Name = "com.CompanyName.AppName.BackgroundService", Process = ":TestProcess")]
public class BackgroundService : Service
{
    public override IBinder OnBind(Intent intent)
    {
        return null;
    }

    public override StartCommandResult OnStartCommand(Android.Content.Intent intent, StartCommandFlags flags, int startId)
    {
        Task task = new Task(() =>
        {
            while (true)
            {
                System.Threading.Thread.Sleep(10000);
            }
        });
        task.Start();

        return StartCommandResult.Sticky;
    }
    public void StartBackgroundService()
    {
        //サービスを起動する
        Intent serviceIntent = new Intent(this, typeof(BackgroundService));
        serviceIntent.AddFlags(ActivityFlags.NewTask);
        serviceIntent.SetPackage(this.PackageManager.GetPackageInfo(this.PackageName, 0).PackageName);
        base.StartService(serviceIntent);
    }
    public override void OnDestroy()
    {
        base.OnDestroy();            
        //Killされてもサービスを再起動する。
        this.StartBackgroundService();
    }
}

<service android:name="com.CompanyName.AppName.BackgroundService"/>

[Service(Exported = true, IsolatedProcess = true)]

２．BroadcastReceiverで起動完了アナウンスを取得する

[BroadcastReceiver]
[IntentFilter(new[] { Intent.ActionBootCompleted,
                      "android.intent.action.QUICKBOOT_POWERON",
                      "com.htc.intent.action.QUICKBOOT_POWERON",
                      "android.intent.action.PACKAGE_INSTALL",
                      "android.intent.action.PACKAGE_ADDED"
                      Intent.ActionMyPackageReplaced　//,
                      //Intent.ActionPackageReplaced
})]
public class BootReceiver : BroadcastReceiver
{
    public BootReceiver() : base()
    {
    }
    public override void OnReceive(Context context, Intent intent)
    {
        //アプリを起動する場合はこちら
        //Intent activityIntent = new Intent(context, typeof(MainActivity));
        //activityIntent.AddFlags(ActivityFlags.NewTask);
        //context.StartActivity(activityIntent);

        //サービスを起動する
        Intent serviceIntent = new Intent(context, typeof(BackgroundService));
        serviceIntent.AddFlags(ActivityFlags.NewTask);
        serviceIntent.SetPackage(context.PackageManager.GetPackageInfo(context.PackageName, 0).PackageName);
        context.StartService(serviceIntent);
    }
}

<receiver android:name="***********.BootReceiver">
    <intent-filter>
        <action android:name="android.intent.action.BOOT_COMPLETED"/>
        <action android:name="android.intent.action.QUICKBOOT_POWERON"/>
        <action android:name="com.htc.intent.action.QUICKBOOT_POWERON"/>
        <action android:name="android.intent.action.PACKAGE_INSTALL"/>
        <action android:name="android.intent.action.PACKAGE_ADDED"/>
        <action android:name="android.intent.action.MY_PACKGE_REPLACED"/>
    </intent-filter>
</receiver>

[BroadcastReceiver(Enabled = true, Name = "com.CompanyName.AppName.BootReceiver", Exported = false, Permission = "android.permission.RECEIVE_BOOT_COMPLETED")]

３．パーミッションを設定する

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

<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.CompanyName.AppName" android:installLocation="internalOnly">

Intent serviceIntent = new Intent(context, typeof(BackgroundService));
if (Build.VERSION.SdkInt >= BuildVersionCodes.Lollipop && 
    Build.VERSION.SdkInt <= BuildVersionCodes.LollipopMr1)
{
    //Android5 Lollipop対応
    string packageName = context.PackageManager.GetPackageInfo(context.PackageName, 0).PackageName;
    serviceIntent.SetPackage(packageName);
    serviceIntent.SetClassName(context, packageName + ".BackgroundService");
}
else
{
    serviceIntent.AddFlags(ActivityFlags.NewTask);
}
context.StartService(serviceIntent);

if (Build.VERSION.SdkInt >= BuildVersionCodes.O)
{
    context.StartForegroundService(serviceIntent);
}
else
{
    context.StartService(serviceIntent);
}

using Android.Support.V4.App;
public override StartCommandResult OnStartCommand(Android.Content.Intent intent, StartCommandFlags flags, int startId)
{
    if (Build.VERSION.SdkInt >= BuildVersionCodes.O)
    {
        //Android8.0 Oreo 対応
        this.RegisterForegroundService();
    }

    Task task = new Task(() =>
    {
        //必要なバックグラウンド処理
    });
    task.Start();

    return StartCommandResult.Sticky;
}
void RegisterForegroundService()
{
    NotificationManager manager = (NotificationManager)context.GetSystemService(Context.NotificationService);
 
    //Andorid8.0 Oreo 以降の通知で必要なChannel
    string channelId = "任意のID";
    if (Build.VERSION.SdkInt >= BuildVersionCodes.O)
    {
        string channelNm = "任意の名称"; //Androidのアプリ設定画面に表示されます。
        var importance = NotificationManager.ImportanceHigh;
        NotificationChannel channel = new NotificationChannel(channelId, channelNm, importance);
        channel.Description = "任意の説明";
        manager.CreateNotificationChannel(channel);
    }
    var notification = new Notification.Builder(this)
            .SetContentTitle(Resources.GetString(Resource.String.app_name))
            .SetContentText("Started ForegroundService.")
            .SetSmallIcon(Resource.Drawable.icon_alpha) //Android7.0対応
            .SetColor(ActivityCompat.GetColor(Android.App.Application.Context, Resource.Color.notification_color))  //Android7.0対応
            .SetOngoing(true)
            .SetChannelId(channelId)  //Android8.0対応
            .Build();

    // Enlist this instance of the service as a foreground service
    this.StartForeground(99999, notification);    //IDの値は任意
}