fragment的getActivity和activity的getapplication实现共享方法和变量

1、fragment内部实现对activity的ui更新

MainActivity ma = (MainActivity) getActivity();
ma.switchContent(leftDiscount);
ma.scrollToHideMenu();

2、activity共享

getApplication的变量

app = (MyApplication) this.getApplication();
app.setHandler_poi(handler_Poi);

Done！