recyclerview的博客网址需要的权限
http://note.youdao.com/noteshare?id=7f2e4e00fae3f8f1de10796a1c6a90ec
compile 'com.android.support:mediarouter-v7:25.0.0'
compile 'com.android.support:appcompat-v7:25.0.0'
compile 'com.android.support:recyclerview-v7:25.0.0'