a、引入ButterKnife库，必须引入ButterKnife库，生成ButterKnife的菜单才可用
b、在R.layout.xxxxx的布局名称上点击右键，在弹出菜单依次选择Aedu->Generate Butterknife Injections，然后按照弹窗指示继续操作即可
c、设置字段前缀，如mUserNameEdit。File->Settings->Other Settings->ButterknifeZelezny->Prefix.....
