Android - オプションメニュー

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto">
    <item
        android:id="@+id/sign_out_menu"
        android:title="@string/sign_out"
        app:showAsAction="never"/>
</menu>

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.main_menu, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    switch(item.getItemId()){
        case R.id.sign_out_menu:
            Log.d(TAG, "Settings Selected.");
            break;
    }
    return true;
}