如何隐藏从服务调用的活动android

Question

我有一个服务，有时称为显示alertdialog的活动..当点击确定按钮时，我想要去我的应用程序的活动在屏幕上，或者，如果我的应用程序是不是在前面，回过头来用户在显示窗口..这是我的alertdialog

public class ActivityNotification extends Activity{ 
private String client,notifica; 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    client = getIntent().getStringExtra("client"); 
    notifica = getIntent().getStringExtra("notifica"); 

    final AlertDialog alertDialog = new AlertDialog.Builder(this).create(); 
    alertDialog.setTitle("Notifica da "+client); 
    alertDialog.setMessage(notifica); 
    alertDialog.setButton("OK", new DialogInterface.OnClickListener() { 
     public void onClick(DialogInterface dialog, int which) { 
      alertDialog.cancel(); 
     } 
    }); 
    alertDialog.setIcon(R.drawable.icon); 
    alertDialog.show(); 
} 
} 

这就是我把这个活动从服务的方式

Notification notification = new Notification(R.drawable.icon, "Notifica da "+client, 10000); 
    notification.flags |=Notification.FLAG_AUTO_CANCEL; 
    CharSequence contentTitle = "Notifica da "+client; 
    CharSequence contentText = notifica; 
    notification.defaults |= Notification.DEFAULT_SOUND; 
    notification.defaults |= Notification.DEFAULT_VIBRATE; 
    //Intent notificationIntent = new Intent(this,ActivityNotification.class); 
    Intent notificationIntent = new Intent(); 
    notificationIntent.setClassName("package", "package.ActivityNotification"); 
    notificationIntent.putExtra("client",client); 
    notificationIntent.putExtra("notifica",notifica); 
    notificationIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); 
    notificationIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); 
    PendingIntent contentIntent = PendingIntent.getActivity(this, 0, notificationIntent,0); 
    notification.setLatestEventInfo(this, contentTitle, contentText, contentIntent); 
    mManager.notify(id, notification); 

什么都可以我做？你能帮我吗？

Answer 1

听起来像你需要恢复当前在手机上的应用程序的历史堆栈。 ActivityManager可以帮助你。

编号：

http://developer.android.com/reference/android/app/ActivityManager.html

Answer 2

你似乎有很多事情在那里进行，只是为了从服务开始一项活动。为什么你不能只是这样做：

Intent intent = new Intent(getBaseContext(), SomeActivity.class); 
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); 
getApplication().startActivity(intent); 

？