关于android:cannot resolve RecyclerView Adapter

cannot resolve RecyclerView Adapter

我正在学习本教程，我需要添加 recycleview。但 Android Studio 无法解析 RecyclerView。我也向 gradle 文件添加了依赖项。我尝试将库添加到 lib 文件夹，如此处所述。但没有任何效果。

1	compile 'com.android.support:recyclerview-v7:23.2.0'

enter

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dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
testCompile 'junit:junit:4.12'
compile 'com.android.support:appcompat-v7:23.2.0'
compile 'com.android.support:design:23.2.0'
compile 'com.android.support:recyclerview-v7:23.2.0'

}

在这一行失败了。

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RecyclerView.Adapter recyclerViewAdapter;

recyclerViewAdapter = new RecyclerViewAdapter(navTitles,navIcons,this);
recyclerView.setAdapter(recyclerViewAdapter);