I wanted to install an app from another application. I came across this thread https://www.b4x.com/android/forum/threads/version-safe-apk-installation.87667/.
I have tried to follow anexample in this thread, but the result from the Sub CanRequestPackageInstalls was always false, even if installation of applications from unknown sources was enabled.
I had a look at https://developer.android.com/refer...ckageManager.html#canRequestPackageInstalls(), and it turns out, that according to this page: An application must target Android O or higher and declare permission Manifest.permission.REQUEST_INSTALL_PACKAGES in order to use this API.
In the example, there is a following code:
The code is looking at phone.SdkVersion >= 26, which is OS build version (which on my phone is Android 9), not a Target SDK (which is declared in the Manifest) as per android PackageManager documentation.
And that was an error in this Sub.
I had Target SDK set to be lower than 26, and that's why CanRequestPackageInstalls always returned false.
I have tried to follow anexample in this thread, but the result from the Sub CanRequestPackageInstalls was always false, even if installation of applications from unknown sources was enabled.
I had a look at https://developer.android.com/refer...ckageManager.html#canRequestPackageInstalls(), and it turns out, that according to this page: An application must target Android O or higher and declare permission Manifest.permission.REQUEST_INSTALL_PACKAGES in order to use this API.
In the example, there is a following code:
B4X:
Private Sub CheckInstallationRequirements As ResumableSub
If File.ExternalWritable = False Then
MsgboxAsync("Storage card not available. Make sure that your device is not connected in USB storage mode.", "")
Return False
Else If phone.SdkVersion >= 26 And CanRequestPackageInstalls = False Then
MsgboxAsync("Please allow me to install applications.", "")
Wait For Msgbox_Result(Result As Int)
Dim in As Intent
in.Initialize("android.settings.MANAGE_UNKNOWN_APP_SOURCES", "package:" & Application.PackageName)
StartActivity(in)
Wait For Activity_Resume '<-- wait for Activity_Resume
Dim b As Boolean = CanRequestPackageInstalls
Log("CanRequestPackageInstalls " & b)
Return b
Else If CheckNonMarketAppsEnabled = False Then
MsgboxAsync("Please enable installation of non-market applications." & CRLF & "Under Settings - Security - Unknown sources" _
& CRLF & "Or Settings - Applications - Unknown sources", "")
Return False
Else
Return True
End If
End Sub
Private Sub CanRequestPackageInstalls As Boolean
Dim ctxt As JavaObject
ctxt.InitializeContext
Dim PackageManager As JavaObject = ctxt.RunMethod("getPackageManager", Null)
Return PackageManager.RunMethod("canRequestPackageInstalls", Null)
End SubAnd that was an error in this Sub.
I had Target SDK set to be lower than 26, and that's why CanRequestPackageInstalls always returned false.