ScreenSizeUtils.java

package cn.hjtech.pigeon.common.utils;

import android.content.Context;
import android.util.DisplayMetrics;
import android.view.WindowManager;

/**
 * 文件名:    SharePreUtils
 * 创建时间:  2017/05/24 on 17:58
 * 描述: 
 * 	1.获取手机屏幕的宽高
 * 	2.dip 与 px 之间的转换
 *
 * @see android.support.annotation.Px
 */

public class ScreenSizeUtils {

    private static ScreenSizeUtils instance = null;
    private int screenWidth, screenHeight;

    public static ScreenSizeUtils getInstance(Context mContext) {
        if (instance == null) {
            synchronized (ScreenSizeUtils.class) {
                if (instance == null)
                    instance = new ScreenSizeUtils(mContext);
            }
        }
        return instance;
    }

    private ScreenSizeUtils(Context mContext) {
        WindowManager manager = (WindowManager) mContext.getSystemService(Context.WINDOW_SERVICE);
        DisplayMetrics dm = new DisplayMetrics();
        manager.getDefaultDisplay().getMetrics(dm);
        // 获取屏幕分辨率宽度
        screenWidth = dm.widthPixels;
        // 获取屏幕分辨率高度
        screenHeight = dm.heightPixels;
    }

    //获取屏幕宽度
    public int getScreenWidth() {
        return screenWidth;
    }

    //获取屏幕高度
    public int getScreenHeight() {
        return screenHeight;
    }

    /**
     * 根据手机的分辨率从 dip 的单位 转成为 px(像素)
     *
     * @return px
     */
    private int dip2px(Context context, float dpValue) {
        final float scale = context.getResources().getDisplayMetrics().density;
        return (int) (dpValue * scale + 0.5f);
    }

    /**
     * 根据手机的分辨率从 px(像素) 的单位 转成为 dp
     */
    public static int px2dip(Context context, float pxValue) {
        final float scale = context.getResources().getDisplayMetrics().density;
        return (int) (pxValue / scale + 0.5f);
    }
}