How to close a hanged (dos not respond) android App by another App programmatically

Question

With this code I can close App (B) by another App (A):

App (A) code:

var
  LService: JObject;
begin
      LService := TAndroidHelper.Context.getSystemService(TJContext.JavaClass.ACTIVITY_SERVICE);
       if LService <> nil then
       TJActivityManager.Wrap(JObjectToID(LService)).killBackgroundProcesses(StringToJString(‘App B Name’));

end;

But when App (B) hanged (dos not respond) this code not effect. How can close it.(Delphi Code needed)