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WifiUtils

WiFi Utils is a library that provides a set of convenience methods for managing WiFi State, WiFi Scan, And WiFi Connection to Hotspots. If you have ever worked with WifiManager you should know how painful it is to make a simple wifi network scan or even worse to connect to a hotspot programmatically. So that's what my new library is all about. To make it easier for me and hopefully for other developers as well to do those kind of tasks from Java code. So lets jump right in some code examples.

Enabling/Disabling WiFi

turn on device's wifi using the following:

 WifiUtils.withContext(getApplicationContext()).enableWifi(this::checkResult);

Where checkResult could be a custom-defined method of your own that would deal accordingly in each situation. For Example:

  private void checkResult(boolean isSuccess)
  {
       if (isSuccess)
           Toast.makeText(MainActivity.this, "WIFI ENABLED", Toast.LENGTH_SHORT).show();
       else
           Toast.makeText(MainActivity.this, "COULDN'T ENABLE WIFI", Toast.LENGTH_SHORT).show();
  }

If you don't want to deal with call backs you can also call enableWifi method like so.

 WifiUtils.withContext(getApplicationContext()).enableWifi();

Similarly you can turn off the wifi using this:

WifiUtils.withContext(getApplicationContext()).disableWifi();

Scanning for WiFi Networks

You can easily perform a WiFi Network scan like so:

WifiUtils.withContext(getApplicationContext()).scanWifi(this::getScanResults).start();

private void getScanResults(@NonNull final List<ScanResult> results)
{
    if (results.isEmpty())
    {
        Log.i(TAG, "SCAN RESULTS IT'S EMPTY");
        return;
    }
    Log.i(TAG, "GOT SCAN RESULTS " + results);
}

Connecting to WiFi Networks

Now lets get to the interesting stuff. You can connect to any WiFi network programmatically knowing only SSID and WPA/WPA2 key:

   WifiUtils.withContext(getApplicationContext())
                        .connectWith("MitsarasWiFi", "MitsarasPassword123")
                        .onConnectionResult(this::checkResult)
                        .start();

Again checkResult could be something like:

  private void checkResult(boolean isSuccess)
  {
        if (isSuccess)
            Toast.makeText(MainActivity.this, "CONNECTED YAY", Toast.LENGTH_SHORT).show();
        else
            Toast.makeText(MainActivity.this, "COULDN'T CONNECT", Toast.LENGTH_SHORT).show();
  }

There are also a few other options that would allow you to do the same job: For example you can connect using SSID, BSSID and WPA/WPA2 Key:

 WifiUtils.withContext(getApplicationContext())
                      .connectWith("MitsarasWiFi", "AB:CD:EF:12:34:56", "MitsarasPassword123")
                      .onConnectionResult(this::checkResult)
                      .start();

Lastly WifiUtils can also connect using a specified scanResult after a WiFi Scan is complete, for example:

WifiUtils.withContext(getApplicationContext())
                     .connectWithScanResult("MitsarasPasword123", scanResults -> scanResults.get(0))
                     .onConnectionResult(this::checkResult)
                     .start();

The above example will perform a WiFi Scan and connectWithScanResult will return a List<ScanResult> scanResults with all the available WiFi networks around. The method then expects you to Return a single scanResult out of the list of results of your choice so that it can try to connect to it. The rest is pretty much the same.

Canceling an ongoing connection

You have two options to cancel a connection in progress.

  • If Connection takes too long to complete and just hangs in there without calling back onConnectionResult You can specify a TimeOut in milliseconds.
WifiUtils.withContext(getApplicationContext())
                     .connectWith("MitsarasWiFi", "MitsarasPassword123")
                     .setTimeout(15000)
                     .onConnectionResult(this::checkResult)
                     .start();

The Connection will fail in 15 seconds. The default timeOut is 30 seconds.

  • You can also cancel an ongoing connection immediately using the following:
 WifiConnectorBuilder.WifiUtilsBuilder builder = WifiUtils.withContext(getApplicationContext());
 builder.connectWith("MitsarasWiFi", "MitsarasPassword123")
 .onConnectionResult(this::checkResult)
 .start();
 builder.cancelAutoConnect();

Connecting with WPS keys.

On Androids 5.0 and greater there is also an option to connect using WPS keys. This library makes it easier and safer to connect using WPS than the stock android API.

WifiUtils.withContext(getApplicationContext())
                     .connectWithWps("d8:74:95:e6:f5:f8", "51362485")
                     .onConnectionWpsResult(this::checkResult)
                     .start();

Enable Logging

If you want to receive some extra logging info comming from WiFi Utils you can enable its logging capabilities with WifiUtils.enableLog(true);

Permissions

Damn You are required to set a few permissions in order for this lib to work correctly :(

<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE"/>
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/> <!-- for Android 6 and above -->
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/> <!-- for Android 6 and above -->

Add it to your project

Download

Add the following to your app module build.gradle file

    dependencies {
       compile 'com.thanosfisherman.wifiutils:wifiutils:<latest version here>'
    }

Apps using this library

My app of course GWPA Finder Duh :P

Contributing?

There are a few more things left to be covered in this tutorial. Hopefully I will improve upon this in the future.

Feel free to add/correct/fix something to this library, I will be glad to improve it with your help.

Please have a look at the Contributing Guide before making a Pull Request.

License

License

Copyright 2017 Thanos Psaridis

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

   http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.