1.File -->Project Structure --> app --> Dependencies -->
右上角绿色加号 --> Library dependency -->
在搜索栏里输入“com.android.support:recyclerview-v7”(或者直接找)-->选中后OK即可
1.File -->Project Structure --> app --> Dependencies -->
右上角绿色加号 --> Library dependency -->
在搜索栏里输入“com.android.support:recyclerview-v7”(或者直接找)-->选中后OK即可