dp px 转换工具

 public class DensityUtil {
     private final static String TAG = "DensityUtil";
     private static float density = 0f;
     private static float defaultDensity = 1.5f;// 高分辨率的手机density普遍接近1.5

     private DensityUtil() {   }

     public static void setDensity(float density) {
         DensityUtil.density = density;
     }

     public static float getDensity(Context context) {
         return  context.getResources().getDisplayMetrics().density;
     }

     public static int getScreenWidth(Context context){
         return context.getResources().getDisplayMetrics().widthPixels;
     }
     public static int getScreenHeight(Context context){
         return context.getResources().getDisplayMetrics().heightPixels;
     }
     /**
      * 根据手机的分辨率 dp 转成px(像素)
      */
     public static int dip2px(float dpValue) {
         int px;
         if (density == 0) {
             Log.e(TAG,
                     "density is invalid, you should execute DensityUtil.getDensity(Context context) first");
             px = (int) (dpValue * defaultDensity + 0.5f);
         } else {
             px = (int) (dpValue * density + 0.5f);
         }
         XLog.i(TAG, "px = " + px);
         return px;
     }

     /**
      * 根据手机的分辨率px(像素) 转成dp
      */
     public static int px2dip(float pxValue) {
         int dp;
         if (density == 0) {
             Log.e(TAG,
                     "density is invalid, you should execute DensityUtil.getDensity(Context context) first");
             dp = (int) (pxValue / defaultDensity + 0.5f);
         } else {
             dp = (int) (pxValue / density + 0.5f);
         }
         XLog.i(TAG, "dp = " + dp);
         return dp;
     }

 }