Android Code Snippet check internet connection

Hamied Abou Hulaikah · Nov 10, 2018

I made some modification to be work fine even if you are connected to network but no internet ..

B4X:

Sub Connected As Boolean
    'Requires Phone Library
    Dim p As Phone
    Dim Response, Error As StringBuilder
    Response.Initialize
    Error.Initialize
    'Ping Google DNS 
    p.Shell("ping -c 1 8.8.8.8",Null,Response,Error)
    
    If Error.ToString="" And Response.ToString.Contains("Destination Host Unreachable")=False Then
        Return True
    Else
        Return False
    End If

End Sub

Orginal post here

Erel · Nov 11, 2018

Don't use Phone.Shell. Only Phone.ShellAsync.

B4X:

Sub CheckConnected As ResumableSub
   'Requires Phone Library
   Dim p As Phone
   'Ping Google DNS
   Wait For (p.ShellAsync("ping", Array As String("-c", "1", "8.8.8.8"))) Complete (Success As Boolean, ExitValue As Int, StdOut As String, StdErr As String)
   If StdErr = "" And StdOut.Contains("Destination Host Unreachable")=False Then
       Return True
   Else
       Return False
   End If
End Sub

You need to call it like this:

B4X:

Wait For (CheckConnected) Complete (Connected As Boolean)
If Connected Then
 ...

Running a shell command can take longer than expected in some cases. Doing it synchronously might cause your app to freeze and eventually killed with an ANR.

rscheel · Nov 13, 2018

This works well for me, I have some extra extras in my code.

B4X:

Sub CheckConected() As Boolean
    Dim j As HttpJob
    j.Initialize("", Me)
    j.GetRequest.Timeout = 2000
    j.Download("https://www.google.com") 'Example
    Wait For (j) JobDone(j As HttpJob)
    If j.Success Then
        Log(j.GetString)
        Return True
    Else
        Log("Sin Conexión")
        Return False
    End If
    j.Release
End Sub

inakigarm · Nov 13, 2018

rscheel said:
This works well for me, I have some extra extras in my code.

I'm using this code also (changing google to my server IP) to test internet connection to my server

Android Code Snippet check internet connection

Erel

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rscheel

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inakigarm

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Android Code Snippet check internet connection

Erel

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