wifi management with pyjnius

[hci...@gmail.com]

I have an Android app that I want to get working as a module in kivy using pyjnius. I've attempted converting the code but since I'm a pyjnius n00b it's not working. Below is the code I'm running in java and the pyjnius code.

Java code minus imports and onCreate:

public boolean checkConnectivity(){
        ConnectivityManager conMgr = (ConnectivityManager)getSystemService(Activity.CONNECTIVITY_SERVICE);
        boolean conn = conMgr.getNetworkInfo(ConnectivityManager.TYPE_WIFI).isConnectedOrConnecting();
        if(conn){
            return true;
        } else {
            return false;
        }
    }
   
public void restartWifi(){
    WifiManager wifi = (WifiManager) getSystemService(Context.WIFI_SERVICE);

    WifiManager  wifiManag = (WifiManager) this.getSystemService(WIFI_SERVICE);
    boolean res1 = wifiManag.setWifiEnabled(false);
    res1 = wifiManag.setWifiEnabled(true);
}
   
public void tryWifi(){
    if(checkConnectivity()){
       Toast.makeText(this, "Connected", Toast.LENGTH_SHORT).show();
    } else {
       Toast.makeText(this, "Restarting", Toast.LENGTH_SHORT).show();
        restartWifi();
    }
}

pyjnius code:

from jnius import autoclass, cast

context = autoclass('android.content.Context')
conn_man = autoclass('android.net.ConnectivityManager')
wifi_conn = autoclass('android.net.wifi.WifiConfiguration')
wifi_man = autoclass('android.net.wifi.WifiManager')
activity = autoclass('android.app.Activity')

def check_connectivity():
    con_mgr = cast(conn_man, activity.getSystemService(activity.CONNECTIVITY_SERVICE))
    conn = con_mgr.getNetworkInfo(conn_man.TYPE_WIFI).isConnectedOrConnecting()
    if conn:
        return True
    else:
        return False

def restart_wifi():
    wifi = cast(wifi_man, activity.getSystemService(context.WIFI_SERVICE))
    wifi_manag = cast(wifi_man, context.getSystemService(WIFI_SERVICE))
    res1 = wifi_manag.setWifiEnabled(False)
    res1 = wifi_manag.setWifiEnabled(True)

def try_wifi():
    if check_connectivity():
        print('Connected')
    else:
        print('Restarting')
        restart_wifi()

After compiling the pyjnius code and running it on my nexus 7 I get this error in logcat:

I/python  (14825):  Traceback (most recent call last):
I/python  (14825):    File "/home/kivy/Desktop/main.py", line 41, in <module>
I/python  (14825):    File "/home/kivy/android/python-for-android/build/python-install/lib/python2.7/site-packages/kivy/app.py", line 577, in run
I/python  (14825):    File "/home/kivy/Desktop/main.py", line 36, in build
I/python  (14825):    File "/home/kivy/Desktop/main.py", line 27, in try_wifi
I/python  (14825):    File "/home/kivy/Desktop/main.py", line 13, in check_connectivity
I/python  (14825):    File "jnius_export_class.pxi", line 548, in jnius.jnius.JavaMethod.__call__ (jnius/jnius.c:17107)
I/python  (14825):    File "jnius_export_class.pxi", line 503, in jnius.jnius.JavaMethod.ensure_method (jnius/jnius.c:16603)
I/python  (14825):  jnius.jnius.JavaException: Unable to find a None method!
I/python  (14825): Python for android ended.

Anybody know what I'm doing wrong here? I think it might have to do with how I'm casting or referencing the current activity?

[Ben Rousch]

The first problem I see is that you are using android.app.Activity. Kivy's python-for-android provides its own Activity. The usual way we use this is:

PythonActivity = autoclass('org.renpy.android.PythonActivity')

activity = PythonActivity.mActivity

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[hci...@gmail.com]

Thanks for the help! I forgot about that using PythonActivity. I changed it out and it now has a different issue that throws runtime errors, a list a million miles long, I don't think you'd be interested. It's still not getting past the first line in the check_connectivity method. Here's what my code looks like now:

from jnius import autoclass, cast

import kivy
from kivy.app import App
from kivy.uix.label import Label


Context = autoclass('android.content.Context')
ConnectivityManager = autoclass('android.net.ConnectivityManager')
WifiConfiguration = autoclass('android.net.wifi.WifiConfiguration')
WifiManager = autoclass('android.net.wifi.WifiManager')
Activity = autoclass('android.app.Activity')

PythonActivity = autoclass('org.renpy.android.PythonActivity')
activity = PythonActivity.mActivity

def check_connectivity():
   con_mgr = cast(ConnectivityManager, activity.getSystemService(activity.CONNECTIVITY_SERVICE))
   conn = con_mgr.getNetworkInfo(ConnectivityManager.TYPE_WIFI).isConnectedOrConnecting()

   if conn:
       return True
   else:
       return False


def restart_wifi():

    wifi = cast(ConnectivityManager, activity.getSystemService(Context.WIFI_SERVICE))
    wifi_manag = cast(WifiManager, Context.getSystemService(Context.WIFI_SERVICE))

    res1 = wifi_manag.setWifiEnabled(False)
    res1 = wifi_manag.setWifiEnabled(True)


def try_wifi():
    if check_connectivity():
        print('Connected')
    else:
        print('Restarting')
        restart_wifi()
       

class myapp(App):
    def build(self):
        try_wifi()
        return Label(text='Stuff')
       
if __name__=='__main__':
    myapp().run()

[hci...@gmail.com]

It might be helpful that the runtime error says ' Fatal signal 11' at the top of it. That code has something to do with non initiated variables. I don't see anything above that seems to not be initialised. Is there?

[hci...@gmail.com]

Okay, so I fixed it myself just by trying different things out. The main issue I ran into was the fact that Java needs the casting of the ConnectivityManager object, pyjnius seems to not. I took out all the casting, made sure the activity references were to the python activity and took out some unnecessary lines of code and,  voila! I love python, even when you wrap Java code you end up with less lines and better efficiency. Here is the working code:

def check_connectivity():
    con_mgr = activity.getSystemService(Activity.CONNECTIVITY_SERVICE)

    conn = con_mgr.getNetworkInfo(ConnectivityManager.TYPE_WIFI).isConnectedOrConnecting()
    if conn:
       return True
    else:
       return False


def restart_wifi():

    wifi_service = activity.getSystemService(Context.WIFI_SERVICE)
    wifi_service.setWifiEnabled(False)
    wifi_service.setWifiEnabled(True)


def try_wifi():
    if not check_connectivity():
        restart_wifi()

    

[Ben Rousch]

Thanks for following up with the fixed version. It often answers others' questions sometimes months down the road.

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[hci...@gmail.com]

Oh don't I know it! We do what we can to help.