Android 二进制文件的读写

我想读写一个Lowrance.usr文件。这是一个具有特定数据结构的二进制文件，我已设法对其进行解码，并用visual basic编写了一个程序，用于执行必要的读写操作。我正在把这个软件移植到我的android手机上

我在VB中定义的结构是：

   Public Structure WAYPOINT
    Public wWaypointNum As Integer
    Public dwLatitudeMM As Long
    Public dwLongitudeMM As Long
    Public dwAltitudeFT As Long
    Public dwWaypointNmLength As Long
    Public abWaypointName As Char()
    Public wWaypointDescLength As Long
    Public abWaypointDescription As Char()
    Public dwWaypointTime As Long
    Public dwWaypointSymbol As Long
    Public wWaypointStatus As Integer
End Structure

然后使用以下代码读取该文件：

   Private Sub btnRead_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnRead.Click
    Dim i As Integer
    Dim objBR As BinaryReader
    Dim objFS As FileStream
    Dim objWP As New WAYPOINT
    Dim objwVer As Integer
    Dim objwSVer As Integer
    Dim objNoWaypoints As Integer
    Dim objNoRoutes As Integer
    Dim TempLat As Double
    Dim TempLng As Double
    Dim LatString As String
    Dim LngString As String
    objFS = New FileStream("c:\Binary\Binary File\Binary File\waverider.usr", FileMode.Open)
    objBR = New BinaryReader(objFS)
    objBR.BaseStream.Seek(0, SeekOrigin.Begin)
    objwVer = objBR.ReadInt16
    objwSVer = objBR.ReadInt16
    objNoWaypoints = objBR.ReadInt16
    For i = 1 To objNoWaypoints
        objWP = Nothing
        With objWP
            .wWaypointNum = objBR.ReadInt16
            .dwLatitudeMM = objBR.ReadInt32
            .dwLongitudeMM = objBR.ReadInt32
            .dwAltitudeFT = objBR.ReadInt32
            .dwWaypointNmLength = objBR.ReadInt32
            .abWaypointName = objBR.ReadChars(.dwWaypointNmLength)
            .wWaypointDescLength = objBR.ReadInt32
            .abWaypointDescription = objBR.ReadChars(.wWaypointDescLength)
            .dwWaypointTime = objBR.ReadInt32
            .dwWaypointSymbol = objBR.ReadInt32
            .wWaypointStatus = objBR.ReadInt16
        End With
        TempLat = objWP.dwLatitudeMM / EarthRad
        TempLat = Math.Exp(TempLat)
        TempLat = (2 * Math.Atan(TempLat)) - (Math.PI / 2)
        TempLat = TempLat * RadToDeg
        LatString = DegToDecMin(TempLat, "Lat")
        TempLng = objWP.dwLongitudeMM / EarthRad
        TempLng = Math.Exp(TempLng)
        TempLng = (2 * Math.Atan(TempLng)) - (Math.PI / 2)
        TempLng = TempLng * RadToDeg
        LngString = DegToDecMin(TempLng, "Lng")
        With lvWaypoints
            Dim lv As ListViewItem = .Items.Add(objWP.abWaypointName)
            With lv
                .SubItems.Add(objWP.abWaypointDescription)
                .SubItems.Add(LatString)
                .SubItems.Add(LngString)
            End With
        End With
    Next i
    '\\ Read Routes
    'objNoRoutes = objBR.ReadInt16 'Number of Routes
End Sub

然后使用以下方法对数据进行解码：

   Public Function DegToDecMin(ByVal DecDeg As Double, ByVal LatLng As String) As String
    Dim ReturnValue As String
    Dim Pos As String
    If LatLng = "Lat" Then
        If DecDeg < 0 Then Pos = "S" Else Pos = "N"
    Else
        If DecDeg < 0 Then Pos = "W" Else Pos = "E"
    End If
    Dim mDeg As Double = Math.Abs(DecDeg)
    Dim mWholeDeg As Double = Math.Truncate(mDeg)
    Dim mRemDegS As String = String.Format("{0:##.000}", (mDeg - mWholeDeg) * 60)
    If InStr(mRemDegS, ".") = 2 Then mRemDegS = "0" & mRemDegS
    If InStr(mRemDegS, ".") = 1 Then mRemDegS = "00" & mRemDegS
    ReturnValue = mWholeDeg.ToString & Chr(176) & mRemDegS & "'" & Pos
    Return ReturnValue
End Function

公共函数DegToDecMin（ByVal dededeg为Double，ByVal LatLng为String）为String
将返回值设置为字符串
作为字符串的Dim Pos
如果LatLng=“Lat”，则
如果dedeg<0，则Pos=“S”Else Pos=“N”
其他的
如果dedeg<0，则Pos=“W”Else Pos=“E”
如果结束
尺寸mDeg为双=数学绝对值（十度）
Dim mWholeDeg As Double=数学截断（mDeg）
Dim mRemDegS As String=String.Format（“{0:###.000}”，（mDeg-mWholeDeg）*60）
如果InStr（mRemDegS，“.”=2，则mRemDegS=“0”&mRemDegS
如果InStr（mRemDegS，“.”=1，则mRemDegS=“00”&mRemDegS
ReturnValue=mWholeDeg.ToString&Chr（176）&mRemDegS&“'”和Pos
返回值
端函数

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Java中是否有类似的功能可以实现相同的目标

，因为Java唯一的语法是根据Java语法进行更改

首先需要创建一个bean文件，如下所示

public class WayPoint
{
    public int wWaypointNum;
    public int dwLatitudeMM;
    public dwLongitudeMM;
    ...
}

其次，您需要文件API来读写文件。为此，您可以使用、、