WiFi state is not enabling

Question

I am trying to create a widget for enabling and disabling the wifi.

if(myWifiManager.isWifiEnabled()){
            System.out.println("Toggle Wifi Enabled going to disable");
            myWifiManager.setWifiEnabled(false);
        }
        else{
            System.out.println("Wifi Disabled going to enable ");

            myWifiManager.setWifiEnabled(true);
            System.out.println("WI: "+myWifiManager.isWifiEnabled());
        }

This is the code i am using the disabling part is working fine but the enabling part is not working fine. Soon after enabling the wifi i am printing the wifi state i am getting it as false.

Answer 1

Here is how to turn on and turn off wifi in android.

First you need to declare the following in your manifest file

<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"></uses-permission>
<uses-permission android:name="android.permission.UPDATE_DEVICE_STATS"></uses-permission>
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE"></uses-permission>
<uses-permission android:name="android.permission.WAKE_LOCK"></uses-permission>

After doing it that on your Activity class

private WifiManager wifiManager;
@Override 
public void onCreate(Bundle icicle) {
 ....................
 wifiManager = (WifiManager) this.getSystemService(Context.WIFI_SERVICE);
 if(wifiManager.isWifiEnabled()){
 wifiManager.setWifiEnabled(false);
 }else{
wifiManager.setWifiEnabled(true);
}

}

Explanation

Get the Wifi service from our system

wifiManager = (WifiManager) this.getSystemService(Context.WIFI_SERVICE);

Check the our wifi is currently turned on or turned off

if(wifiManager.isWifiEnabled()){

Turn on/off our wifi wifiManager.setWifiEnabled();

Reference

WifiEnabler

http://google-androidlovers.blogspot.com/2012/01/scan-for-wireless-networks-in-android.html

http://www.java2s.com/Open-Source/Android/android-platform-apps/Settings/com/android/settings/wifi/WifiApEnabler.java.htm

Answer 2

Deprecated: Starting with Build.VERSION_CODES#Q, applications are not allowed to enable/disable Wi-Fi. Compatibility Note: For applications targeting android.os.Build.VERSION_CODES#Q or above, this API will always fail and return false. If apps are targeting an older SDK (android.os.Build.VERSION_CODES#P or below), they can continue to use this API.

(Source)

So this will only work for devices with android Pie and below.