To open the WI-FI settings the code is:
startActivity(new Intent(Settings.ACTION_WIFI_SETTINGS));
To open the WI-FI Direct settings the code is ?
Here's the manifest for that activity on KitKat,
<activity android:name="Settings$WifiP2pSettingsActivity"
android:taskAffinity="com.android.settings"
android:parentActivityName="Settings$WifiSettingsActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.DEFAULT" />
<category android:name="android.intent.category.VOICE_LAUNCH" />
</intent-filter>
<meta-data android:name="com.android.settings.FRAGMENT_CLASS"
android:value="com.android.settings.wifi.p2p.WifiP2pSettings" />
<meta-data android:name="com.android.settings.TOP_LEVEL_HEADER_ID"
android:resource="@id/wireless_settings" />
</activity>
So it doesn't look like they exposed an explicit intent. You may be able to start it via ComponentName
but the name is not guaranteed to be the same across Android releases.