content: package com.hzl.pulltorefresh.refresh.util;
  
  import android.content.Context;
  import android.util.DisplayMetrics;
  import android.view.View;
  import android.view.WindowManager;
  
  public class PtrLocalDisplay {
  
      public static int SCREEN_WIDTH_PIXELS;
      public static int SCREEN_HEIGHT_PIXELS;
      public static float SCREEN_DENSITY;
      public static int SCREEN_WIDTH_DP;
      public static int SCREEN_HEIGHT_DP;
  
      public static void init(Context context) {
          if (context == null) {
              return;
          }
          DisplayMetrics dm = new DisplayMetrics();
          WindowManager wm = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
          wm.getDefaultDisplay().getMetrics(dm);
          SCREEN_WIDTH_PIXELS = dm.widthPixels;
          SCREEN_HEIGHT_PIXELS = dm.heightPixels;
          SCREEN_DENSITY = dm.density;
          SCREEN_WIDTH_DP = (int) (SCREEN_WIDTH_PIXELS / dm.density);
          SCREEN_HEIGHT_DP = (int) (SCREEN_HEIGHT_PIXELS / dm.density);
      }
  
      public static int dp2px(float dp) {
          final float scale = SCREEN_DENSITY;
          return (int) (dp * scale + 0.5f);
      }
  
      public static int designedDP2px(float designedDp) {
          if (SCREEN_WIDTH_DP != 320) {
              designedDp = designedDp * SCREEN_WIDTH_DP / 320f;
          }
          return dp2px(designedDp);
      }
  
      public static void setPadding(final View view, float left, float top, float right, float bottom) {
          view.setPadding(designedDP2px(left), dp2px(top), designedDP2px(right), dp2px(bottom));
      }
  }
  