ScreenUtils.java

package com.anthony.library.utils;

import android.app.Activity;
import android.content.Context;
import android.content.res.TypedArray;
import android.util.DisplayMetrics;

import java.lang.reflect.Field;

/**
 * Created by Anthony on 2016/11/28.
 * Class Note:
 * utils for screen size info
 */
public class ScreenUtils {

    public static int dip2px(Context context, float dpValue) {
        final float scale = context.getResources().getDisplayMetrics().density;
        return (int) (dpValue * scale + 0.5f);
    }


    public static int px2dip(Context context, float pxValue) {
        final float scale = context.getResources().getDisplayMetrics().density;
        return (int) (pxValue / scale + 0.5f);
    }

    public static int px2sp(Context context, float pxValue) {
        final float scale = context.getResources().getDisplayMetrics().density;
        return (int) (pxValue / scale + 0.5f);
    }

    public static int sp2px(Context context, float spValue) {
        final float scale = context.getResources().getDisplayMetrics().density;
        return (int) (spValue * scale + 0.5f);
    }

    public static int getScreenWidth(Context context) {
        DisplayMetrics localDisplayMetrics = new DisplayMetrics();
        ((Activity) context).getWindowManager().getDefaultDisplay().getMetrics(localDisplayMetrics);
        return localDisplayMetrics.widthPixels;
    }

    public static int getScreenHeight(Context context) {
        DisplayMetrics localDisplayMetrics = new DisplayMetrics();
        ((Activity) context).getWindowManager().getDefaultDisplay().getMetrics(localDisplayMetrics);
        return localDisplayMetrics.heightPixels - getStatusBarHeight(context);
    }

    /**
     * @deprecated  use {@link #getScreenHeight(Context)} instead
     * get screen size height in pixels
     *
     * @param context
     * @return the pixels of the screen height
     */
    public static int getHeight(Activity context) {
        DisplayMetrics dm = new DisplayMetrics();
        context.getWindowManager().getDefaultDisplay().getMetrics(dm);
        return dm.heightPixels;
    }

    public static int getStatusBarHeight(Context context){
        Class<?> c = null;
        Object obj = null;
        Field field = null;
        int x = 0, statusBarHeight = 0;
        try {
            c = Class.forName("com.android.internal.R$dimen");
            obj = c.newInstance();
            field = c.getField("status_bar_height");
            x = Integer.parseInt(field.get(obj).toString());
            statusBarHeight = context.getResources().getDimensionPixelSize(x);
        } catch (Exception e1) {
            e1.printStackTrace();
        }
        return statusBarHeight;
    }


    /**
     * get toolbar height
     *
     * @param context
     * @return
     */
    public static int getToolbarHeight(Context context) {
        final TypedArray styledAttributes = context.getTheme().obtainStyledAttributes(
                new int[]{android.R.attr.actionBarSize});
        int toolbarHeight = (int) styledAttributes.getDimension(0, 0);
        styledAttributes.recycle();

        return toolbarHeight;
    }

}