Android Question how to get img width,height,does it need bmp.clear?

Sub GetImgSize(imagePath As String,FileName As String) As Int()
    If imagePath="" Then imagePath=File.DirInternal
    Dim wh(1) As Int
    If File.Exists(imagePath, FileName) Then
        Dim bmp As Bitmap
        bmp = LoadBitmap(imagePath, FileName)
        If bmp.IsInitialized Then
            wh(0)= bmp.Width
            wh(1) =bmp.Height
             ' 释放 Bitmap 对象占用的内存
        End If
    End If
    Return wh
End Sub