Android Question JavaObject not works in Android 14

Sinan Tuzcu

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Hi,

Hello,

My app works perfectly on Android version 9 and older. However, starting from version 14, an issue occurs that causes the app to crash.

I would appreciate support in solving this problem.

B4X: 
Dim socket As JavaObject = r.GetField("socket")
Dim jo As JavaObject = Me
 jo.RunMethod("setKeepaliveSocketOptions", Array(socket, 1000, 1000, 3))


I didn’t have any problems with this on Android 9.
 
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aeric

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I suggest you share the error message that you get.
Can it be changes in protocol?

Network v1.50 - Adds support for SSL sockets

This update adds support for SSL sockets (client sockets). Example: Sub Process_Globals Private so As Socket Private astream As AsyncStreams End Sub Sub Globals End Sub Sub Activity_Create(FirstTime As Boolean) so.InitializeSSL("so", Null, "") so.Connect("bing.com", 443, 0) End...
www.b4x.com
 
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Sinan Tuzcu

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"Is there a way to modify this code so that it also runs on Android 14?"

B4X: 
Dim r As Reflector
    r.Target = Socket1
    Dim socket As JavaObject = r.GetField("socket")
    Dim jo As JavaObject = Me
    jo.RunMethod("setKeepaliveSocketOptions", Array(socket, 1000, 1000, 3))
 
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Sinan Tuzcu

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Error MSG

 
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Sinan Tuzcu

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This

B4X: 
Dim r As Reflector
    r.Target = Socket1
    Dim socket As JavaObject = r.GetField("socket")
    Dim jo As JavaObject = Me
    jo.RunMethod("setKeepaliveSocketOptions", Array(socket, 1000, 1000, 3))


And this one:
B4X: 
Service.StartForeground(1,Notification1)

and this one
B4X: 
StartService(Winsock)
 
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Sinan Tuzcu

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1. The notifications are no longer displayed in Android 14.
2. In addition, the app crashes immediately as soon as the StartService(Winsock) function is called.
 
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DonManfred

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Sinan Tuzcu said:
2. In addition, the app crashes immediately as soon as the StartService(Winsock) function is called.
Click to expand...
Hiding the full error is a good way not to get help.

What about posting the relevant code AND the full error? This may help to understand the problem.
 
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Sinan Tuzcu

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I try to call this Method, and in this case the App crashed up

B4X: 
Sub Activity_Click
   Dim s As Socket
   s.Initialize("S")
   Dim r As Reflector
   r.Target = s
   Dim socket As JavaObject = r.GetField("socket")
   Dim jo As JavaObject = Me
   jo.RunMethod("setKeepaliveSocketOptions", Array(socket, 1000, 1000, 3))
End Sub

#if Java

import java.io.FileDescriptor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.net.Socket;
private final static int SOL_TCP = 6;
     private final static int TCP_KEEPIDLE = 4;
     private final static int TCP_KEEPINTVL = 5;
     private final static int TCP_KEEPCNT = 6;

public static void setKeepaliveSocketOptions(Socket socket, int idleTimeout, int interval, int count) throws Exception{
      socket.setKeepAlive(true);
      Field socketImplField = Class.forName("java.net.Socket").getDeclaredField("impl");
      socketImplField.setAccessible(true);
      if(socketImplField != null) {
      Object plainSocketImpl = socketImplField.get(socket);
      Field fileDescriptorField = Class.forName("java.net.SocketImpl").getDeclaredField("fd");
      if(fileDescriptorField != null) {
      fileDescriptorField.setAccessible(true);
      FileDescriptor fileDescriptor = (FileDescriptor)fileDescriptorField.get(plainSocketImpl);
      Class libCoreClass = Class.forName("libcore.io.Libcore");
      Field osField = libCoreClass.getDeclaredField("os");
      osField.setAccessible(true);
      Object libcoreOs = osField.get(libCoreClass);
      Method setSocketOptsMethod = Class.forName("libcore.io.ForwardingOs").getDeclaredMethod("setsockoptInt", FileDescriptor.class, int.class, int.class, int.class);
      if(setSocketOptsMethod != null) {
      setSocketOptsMethod.invoke(libcoreOs, fileDescriptor, SOL_TCP, TCP_KEEPIDLE, idleTimeout);
      setSocketOptsMethod.invoke(libcoreOs, fileDescriptor, SOL_TCP, TCP_KEEPINTVL, interval);
      setSocketOptsMethod.invoke(libcoreOs, fileDescriptor, SOL_TCP, TCP_KEEPCNT, count);
      }
      }
      }
     }
#End If
 
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Sinan Tuzcu

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Longtime User
Hi,

if I do this so:


JavaScript: 
#Region "KeepAlive"
#if Java

import java.io.FileDescriptor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.net.Socket;
private final static int SOL_TCP = 6;
     private final static int TCP_KEEPIDLE = 4;
     private final static int TCP_KEEPINTVL = 5;
     private final static int TCP_KEEPCNT = 6;

public static void setKeepaliveSocketOptions(Socket socket, int idleTimeout, int interval, int count) throws Exception{
    try{
      socket.setKeepAlive(true);
      try {
      Field socketImplField = Class.forName("java.net.Socket").getDeclaredField("impl");
      socketImplField.setAccessible(true);
      if(socketImplField != null) {
      Object plainSocketImpl = socketImplField.get(socket);
      Field fileDescriptorField = Class.forName("java.net.SocketImpl").getDeclaredField("fd");
      if(fileDescriptorField != null) {
      fileDescriptorField.setAccessible(true);
      FileDescriptor fileDescriptor = (FileDescriptor)fileDescriptorField.get(plainSocketImpl);
      Class libCoreClass = Class.forName("libcore.io.Libcore");
      Field osField = libCoreClass.getDeclaredField("os");
      osField.setAccessible(true);
      Object libcoreOs = osField.get(libCoreClass);
      Method setSocketOptsMethod = Class.forName("libcore.io.ForwardingOs").getDeclaredMethod("setsockoptInt", FileDescriptor.class, int.class, int.class, int.class);
      if(setSocketOptsMethod != null) {
      setSocketOptsMethod.invoke(libcoreOs, fileDescriptor, SOL_TCP, TCP_KEEPIDLE, idleTimeout);
      setSocketOptsMethod.invoke(libcoreOs, fileDescriptor, SOL_TCP, TCP_KEEPINTVL, interval);
      setSocketOptsMethod.invoke(libcoreOs, fileDescriptor, SOL_TCP, TCP_KEEPCNT, count);
      }
        }
      }
    }
    catch (Exception reflectionException) {}
  } catch (SocketException e) {}
}
#End If
#End Region

then I get a copiler error:
 
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SJQ

Member
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Longtime User
As a side note you should look into...

Notifications don't work as they used to, with Android 14, I think you need to use a specific permission now.

Also in Android 14, SSLv3, TSLv1.0, TSL1.1 no longer work at all.
Support stopped back in Android 8 but they still worked upto Android 14 where Google removed the protocols.
This will cause your app to crash immediately and you'll need to look through the unfiltered logs for the error.

From what I found out TSL1.2 is out of support but still in operation, TSL1.3 is supported

I've no idea how to resolve this. I did see a code snippet on the forum to set network socket protocol, not sure if it would work for your issue especially as your using a private API.

I'm still waiting on the company I work for to provide a new server and Database server to see if this resoves the issue I'm seeing.
 
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Sinan Tuzcu

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Longtime User
In my case the problem is the keepalive method. If I remove that, it actually works.
But I need the keepalive method to maintain the established connection.
 
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