Cursor

getColumnIndex(String columnName) —— 返回列名为columnName对应的列索引（索引从0开始），如果不存在返回-1.

android实现相册功能 · String path = cursor.getString(cursor.getColumnIndex(MediaStore.Images.Media.DATA)); // 处理每个图片路径} ``` - 使用File类 ...

Start by creating your first app. Go deeper with our training courses or explore app development on your own.

Motivation: Instead of writing String note = cursor.getString(cursor.getColumnIndex(NoteColumns.NOTE)); just call String note = NotesGetter.

When coding the_cursor.getString(csr.getColumnIndex(the_column_name)); Java or the equivalent Kotlin. For SDK31 build, the line is highlighted and shows Value ...

Returns the zero-based index for the given column name, or throws IllegalArgumentException if the column doesn't exist.

Returns the zero-based index for the given column name, or -1 if the column doesn't exist.

Returns the zero-based index for the given column name, or -1 if the column doesn't exist. If you expect the column to exist use getColumnIndexOrThrow(java. ...

The problem is that cursor.getColumnIndex() can return -1, you're passing it as a direct parameter, and the cursor getters need a column index ...

The error message value must be >=0 but getColumnIndex can be -1 in Android Studio typically occurs when you are trying to retrieve a column index from a ...