SQLite和RecyclerView使用过程中两处报错记录

Couldn't read row 0, col -1 from CursorWindow.
Make sure the Cursor is initialized correctly before accessing data from it.

应用安装以后数据库不会再创建，helper的oncreate方法不会调用，在插入字段时，报上述错误，需要删除应用，重新启动安装。

java.lang.NoSuchMethodError: No static method getFont(Landroid/content/Context;ILandroid/util/TypedValue;ILandroid/widget/TextView;)Landroid/graphics/Typeface; in class Landroid/support/v4/content/res/ResourcesCompat;
or its super classes (declaration of 'android.support.v4.content.res.ResourcesCompat' appears in /data/app/com.wyx.android.beatbox-2/base.apk)

RecyclerView的版本与当前编译或者AppCompat支持库的版本不一致，版本超前，需要手动修改降低RV版本或者提高sdk版本。