content: 
  /*
   * The MIT License (MIT)
   *
   * Copyright (c) 2015 malin
   *
   * Permission is hereby granted, free of charge, to any person obtaining a copy
   * of this software and associated documentation files (the "Software"), to deal
   * in the Software without restriction, including without limitation the rights
   * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   * copies of the Software, and to permit persons to whom the Software is
   * furnished to do so, subject to the following conditions:
   *
   * The above copyright notice and this permission notice shall be included in all
   * copies or substantial portions of the Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
   * SOFTWARE.
   */
  
  package com.malin.rxjava.utils;
  
  import android.app.Activity;
  import android.util.DisplayMetrics;
  
  /**
   * 类描述:手机设备的信息
   * 创建人:malin.myemail@gmail.com
   * 创建时间:15-11-10.下午3:26
   * 备注:
   * 参考项目:Android-Universal-Image-Loader
   */
  public class DeviceInfo {
  
      public static int screenWidthForPortrait;   // 屏幕宽度
      public static int screenHeightForPortrait;  // 屏幕高度
      public static float mDensity;
      public static int mDensityDpi;
  
  
      private volatile static DeviceInfo instance;
  
      /**
       * Returns singleton class instance
       */
      public static DeviceInfo getInstance() {
          if (instance == null) {
              synchronized (DeviceInfo.class) {
                  if (instance == null) {
                      instance = new DeviceInfo();
                  }
              }
          }
          return instance;
      }
  
      private DeviceInfo() {
  
      }
  
  
      /**
       * init get device information
       *
       * @param activity
       */
      public void initializeScreenInfo(Activity activity) {
          DisplayMetrics metric = new DisplayMetrics();
          activity.getWindowManager().getDefaultDisplay().getMetrics(metric);
          mDensity = metric.density;
          mDensityDpi = metric.densityDpi;
          if (metric.heightPixels >= metric.widthPixels) {
              screenWidthForPortrait = metric.widthPixels;
              screenHeightForPortrait = metric.heightPixels;
          } else {
              screenWidthForPortrait = metric.heightPixels;
              screenHeightForPortrait = metric.widthPixels;
          }
      }
  }
  