android setting wifi,android - how to open WifiDisplay Setting from another app? - Stack Overflow

I want to open Android4.2 setting WifiDisplaySettingsActivity from my app.

I tried

Intent i;

PackageManager manager = getActivity().getPackageManager();

try {

i = manager.getLaunchIntentForPackage("com.android.settings.wfd");

if (i == null)

throw new PackageManager.NameNotFoundException();

i.addCategory(Intent.ACTION_MAIN);

startActivity(i);

} catch (PackageManager.NameNotFoundException e) {

}

and

final Intent intent = new Intent(Intent.ACTION_MAIN, null);

intent.addCategory(Intent.CATEGORY_LAUNCHER);

final ComponentName cn = new ComponentName("com.android.settings.wfd","com.android.settings.wfd.WifiDisplaySettings");

intent.setComponent(cn);

intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

startActivity(intent);

but none of them could work.

I went to the AndroidManifest.xml to see code

android:label="@string/wifi_display_settings_title"

android:taskAffinity=""

android:excludeFromRecents="true">

android:value="com.android.settings.wfd.WifiDisplaySettings" />

the question is I know it's a fragment class and I know it's package name is com.android.settings.wfd, but I still don't know how to open it, especially I don't know how to handle activity name like this

Settings$WifiDisplaySettingsActivity

Can some one give me

advices???plz....thank you very much

the problem is it's settings.WIFI_DISPLAY_SETTINGS but not ACTION_WIFI_SETTINGS, so the eclipse can't compile

addional:

public final class WifiDisplaySettings extends SettingsPreferenceFragment implements PersistentGroupInfoListener {

private static final String TAG = "WifiDisplaySettings";

private static final int MENU_ID_SCAN = Menu.FIRST;

private static final int MENU_ID_CREATE_GROUP = Menu.FIRST + 1;

private static final int MENU_ID_REMOVE_GROUP = Menu.FIRST + 2;

it's Setting Preference Fragment ... so how do I open it???