Android Question How can modify the app without having access to the source code.

invocker said:

I have this apk source code

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DonManfred said:

1. The Screenshots you posted is NOT from a APK.
2. Without source you are NOT ABLE to change anything.
3. You should describe it much more clearly what exactly you want to do. It is not really clear

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Sub DownloadAndSave (Url As String, Dir As String, FileName As String) As ResumableSub
    Dim j As HttpJob
    j.Initialize("", Me)
    j.Download(Url)
    Wait For (j) JobDone(j As HttpJob)
    If j.Success Then
        Dim out As OutputStream = File.OpenOutput(Dir, FileName, False)
        File.Copy2(j.GetInputStream, out)
        out.Close
    End If
    j.Release
    Return j.Success
End Sub
Sub Button1_Click
dim Url as string = "https://b4x-4c17.kxcdn.com/android/forum/data/avatars/m/70/70838.jpg?1442421564"
dim Dir as string = File.DirRootExternal
dim FileName as string =  "pictures/1.jpg"
Wait For (DownloadAndSave(Url, Dir ,FileName )) Complete (Success As Boolean)
If Success Then
                ToastMessageShow( "Saved " & File.Combine(Dir ,FileName),True)
              End If
End Sub

JohnC said:

If the program is as simple as the source code you provided, then why not simply create a new B4A app that has the changes you need?

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Erel said:

Change code to:

B4X:

dim Url as string = File.ReadString(File.DirAssets, "url.txt")

Create a B4J program that unpacks the APK which is a regular zip file, replaces Files\url.txt, creates a new APK and sign it with jarsigner Java tool.

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Dim str As TextReader
str.Initialize(File.OpenInput(File.DirAssets,"1.txt"))
ToastMessageShow(str.ReadAll,True)

Erel said:

Change code to:

B4X:

dim Url as string = File.ReadString(File.DirAssets, "url.txt")

Create a B4J program that unpacks the APK which is a regular zip file, replaces Files\url.txt, creates a new APK and sign it with jarsigner Java tool.

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kisoft said:

There is an example of how to do this? I am interested in my APK files to obfuscate the code more efficiently.

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Erel said:

I don't see how it is related to obfuscation. If you want to add encrypted data to your app then add the encrypted files directly. No need to unpack and resign the APK.

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