Studio使用eclipse formater的方法：
下载EclipseFormatter.zip 插件，在Android Studio中本地安装 android-formatting.xml。
Step 1: Go to the Plugins Section of Android Studio. The easiest way is Click Shift twice and typePlugins. Now go to the plugins menu.
Step 2: Click on Browse Repositories
Step 3: Type Eclipse Code Formatter in the search box. Select it and Click Install button in the right section
Step 4: After successful installation you can see a blue Eclipse Icon in the top pen
Step 5: Now go to Settings >> Other Settings >> Eclipse Code formatter
Step 6: Then select the Code Format XML file
/****butterknife 变量前缀m配置*****/
Android Studio > settings > butterknife>prefix
