java.lang.NullPointerException:
Attempt to invoke virtual method 'android.database.sqlite.SQLiteDatabase android.content.Context.openOrCreateDatabase(java.lang.String, int, android.database.sqlite.SQLiteDatabase$CursorFactory, android.database.DatabaseErrorHandler)' on a null object reference
这是在Fragment 中使用DBHelper
DBCRUD_Class dbcrud_class=new DBCRUD_Class(getContext())
当我调用插入的方法时,就出错了