UiHelper.java

package com.limelight.utils;

import android.app.Activity;
import android.app.AlertDialog;
import android.app.UiModeManager;
import android.content.Context;
import android.content.DialogInterface;
import android.content.res.Configuration;
import android.view.View;

import com.limelight.R;
import com.limelight.preferences.PreferenceConfiguration;

import java.util.Locale;

public class UiHelper {

    // Values from https://developer.android.com/training/tv/start/layouts.html
    private static final int TV_VERTICAL_PADDING_DP = 27;
    private static final int TV_HORIZONTAL_PADDING_DP = 48;

    public static void setLocale(Activity activity)
    {
        String locale = PreferenceConfiguration.readPreferences(activity).language;
        if (!locale.equals(PreferenceConfiguration.DEFAULT_LANGUAGE)) {
            Configuration config = new Configuration(activity.getResources().getConfiguration());

            // Some locales include both language and country which must be separated
            // before calling the Locale constructor.
            if (locale.contains("-"))
            {
                config.locale = new Locale(locale.substring(0, locale.indexOf('-')),
                        locale.substring(locale.indexOf('-') + 1));
            }
            else
            {
                config.locale = new Locale(locale);
            }

            activity.getResources().updateConfiguration(config, activity.getResources().getDisplayMetrics());
        }
    }

    public static void notifyNewRootView(Activity activity)
    {
        View rootView = activity.findViewById(android.R.id.content);
        UiModeManager modeMgr = (UiModeManager) activity.getSystemService(Context.UI_MODE_SERVICE);

        if (modeMgr.getCurrentModeType() == Configuration.UI_MODE_TYPE_TELEVISION)
        {
            // Increase view padding on TVs
            float scale = activity.getResources().getDisplayMetrics().density;
            int verticalPaddingPixels = (int) (TV_VERTICAL_PADDING_DP*scale + 0.5f);
            int horizontalPaddingPixels = (int) (TV_HORIZONTAL_PADDING_DP*scale + 0.5f);

            rootView.setPadding(horizontalPaddingPixels, verticalPaddingPixels,
                    horizontalPaddingPixels, verticalPaddingPixels);
        }
    }

    public static void displayQuitConfirmationDialog(Activity parent, final Runnable onYes, final Runnable onNo) {
        DialogInterface.OnClickListener dialogClickListener = new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                switch (which){
                    case DialogInterface.BUTTON_POSITIVE:
                        if (onYes != null) {
                            onYes.run();
                        }
                        break;

                    case DialogInterface.BUTTON_NEGATIVE:
                        if (onNo != null) {
                            onNo.run();
                        }
                        break;
                }
            }
        };

        AlertDialog.Builder builder = new AlertDialog.Builder(parent);
        builder.setMessage(parent.getResources().getString(R.string.applist_quit_confirmation))
                .setPositiveButton(parent.getResources().getString(R.string.yes), dialogClickListener)
                .setNegativeButton(parent.getResources().getString(R.string.no), dialogClickListener)
                .show();
    }
}