Can WIFI be turned off programmatically

Question

How can wifi be turned off/on programmatically and do is rooted or system app required for this.

Answer 1

Permissions are required.

I just wrote this app that toggles Wifi.

Manifest

layout

Main Activity

 @Override
  public void onCreate(Bundle savedInstanceState)
  {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    final Button myButton = (Button) findViewById(R.id.my_button);
    myButton.setOnClickListener(new View.OnClickListener()
    {
      @Override
      public void onClick(View v)
      {
        final WifiManager wifi = (WifiManager) getSystemService(Context.WIFI_SERVICE);
        wifi.setWifiEnabled(!wifi.isWifiEnabled());
      }
    });
  }