Set Android IP,DNS,GATEWAY setting programmatically

You can't do this from an application.

Would you like applications on your phone to change phone's settings at will?

You can change system settings programatically.

First you need to request the 'WRITE_SETTINGS' permission in your 'AndroidManifest.xml':

<uses-permission android:name="android.permission.WRITE_SETTINGS"/>

Then you need to actually change the setting using the following code:

    android.provider.Settings.System.putString(getContentResolver(), android.provider.Settings.System.WIFI_USE_STATIC_IP, "0");
    android.provider.Settings.System.putString(getContentResolver(), android.provider.Settings.System.WIFI_STATIC_DNS1, "192.168.0.2");
    android.provider.Settings.System.putString(getContentResolver(), android.provider.Settings.System.WIFI_STATIC_DNS2, "192.168.0.3");
    android.provider.Settings.System.putString(getContentResolver(), android.provider.Settings.System.WIFI_STATIC_GATEWAY, "192.168.0.1");
    android.provider.Settings.System.putString(getContentResolver(), android.provider.Settings.System.WIFI_STATIC_NETMASK, "255.255.255.0");
    android.provider.Settings.System.putString(getContentResolver(), android.provider.Settings.System.WIFI_STATIC_IP, "1");

The current settings can be accessed via the same method but use 'getString' instead of 'putString'.

For information about the settings option visit the reference here: Settings.System | Android Developers