Android代码替代Toast的MessageBar

MessageBarAnAndroidToastreplacement,similartotheoneseenintheGMailapp.Multiplemessagescanbepostedinsuccession,andeachmessagewillbeshownfor5seconds.UsageThere'stwowaystousetheMessageBar.Itcaneitherbeattacheddirectlytoanactivity,oraViewcanbepassed.AttachingtoanactivityThisa