Utils.java

package net.mvla.mvhs;

import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.Context;
import android.os.Build;
import android.os.Handler;
import android.os.Looper;
import android.util.DisplayMetrics;
import android.view.View;
import android.view.ViewTreeObserver;
import android.view.inputmethod.InputMethodManager;
import android.webkit.WebView;

import java.io.FileOutputStream;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;

/**
 * Utilities
 */
public abstract class Utils {

    public static int getNavDrawerWidth(Context context) {
        int navDrawerMargin = context.getResources().getDimensionPixelSize(R.dimen.navigation_drawer_margin);
        DisplayMetrics displayMetrics = context.getResources().getDisplayMetrics();
        int navDrawerWidthLimit = context.getResources().getDimensionPixelSize(R.dimen.navigation_drawer_limit);
        int navDrawerWidth = displayMetrics.widthPixels - navDrawerMargin;
        if (navDrawerWidth > navDrawerWidthLimit) {
            navDrawerWidth = navDrawerWidthLimit;
        }
        return navDrawerWidth;
    }


    public static void addOnGlobalLayoutListener(final View view, final Runnable r) {
        ViewTreeObserver vto = view.getViewTreeObserver();
        vto.addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
            @Override
            public void onGlobalLayout() {
                new Handler(Looper.getMainLooper()).post(r);
                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
                    view.getViewTreeObserver().removeOnGlobalLayoutListener(this);
                } else {
                    //noinspection deprecation
                    view.getViewTreeObserver().removeGlobalOnLayoutListener(this);
                }
            }
        });
    }

    public static boolean sameDay(Calendar cal, Calendar cal2) {
        return cal.get(Calendar.YEAR) == cal2.get(Calendar.YEAR) &&
                cal.get(Calendar.DAY_OF_YEAR) == cal2.get(Calendar.DAY_OF_YEAR);
    }

    public static int convertDpToPx(Context context, float dp) {
        return (int) (dp * context.getResources().getDisplayMetrics().density + 0.5f);
    }

    public static void executeJavascript(WebView view, String javascript) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
            view.evaluateJavascript(javascript, null);
        } else {
            view.loadUrl("javascript:" + javascript);
        }
    }

    public static void hideSoftKeyBoard(Activity context) {
        InputMethodManager imm = (InputMethodManager) context.getSystemService(Activity.INPUT_METHOD_SERVICE);
        if (imm.isAcceptingText()) {
            //If keyboard is open
            imm.hideSoftInputFromWindow(context.getCurrentFocus().getWindowToken(), 0);
        }
    }

    public static double bearing(double lat1, double lon1, double lat2, double lon2) {
        double latitude1 = Math.toRadians(lat1);
        double latitude2 = Math.toRadians(lat2);
        double longDiff = Math.toRadians(lon2 - lon1);
        double y = Math.sin(longDiff) * Math.cos(latitude2);
        double x = Math.cos(latitude1) * Math.sin(latitude2) - Math.sin(latitude1) * Math.cos(latitude2) * Math.cos(longDiff);

        return (Math.toDegrees(Math.atan2(y, x)) + 360) % 360;
    }

    public static void saveBytesToFile(byte[] bytes, String path) {
        FileOutputStream fileOutputStream = null;

        try {
            fileOutputStream = new FileOutputStream(path);
            fileOutputStream.write(bytes);
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                if (fileOutputStream != null) {
                    fileOutputStream.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    @SuppressLint("SimpleDateFormat")
    public static String formatTime(Date date) {
        return new SimpleDateFormat("hh:mm").format(date);
    }
}