会飞的鱼

转载自简书 http://www.jianshu.com/p/7caa5f4f49bd 转载自csdn http://blog.youkuaiyun.com/litefish/article/details/52589089

修改Toolbar的返回按钮图标：<android.support.v7.widget.Toolbar android:id="@+id/toolbar" android:layout_width="match_parent" android:layout_height="?android:actionBarSize" app:layout_collapseMode=