DeviceDimensionsHelper.java

public class DeviceDimensionsHelper {
  // DeviceDimensionsHelper.getDisplayWidth(context) => (display width in pixels)
  public static int getDisplayWidth(Context context) {
      DisplayMetrics displayMetrics = context.getResources().getDisplayMetrics();
      return displayMetrics.widthPixels; 
  }

  // DeviceDimensionsHelper.getDisplayHeight(context) => (display height in pixels)
  public static int getDisplayHeight(Context context) {
      DisplayMetrics displayMetrics = context.getResources().getDisplayMetrics();
      return displayMetrics.heightPixels;
  }

  // DeviceDimensionsHelper.convertDpToPixel(25f, context) => (25dp converted to pixels)
  public static float convertDpToPixel(float dp, Context context){
      Resources r = context.getResources();
      return TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dp, r.getDisplayMetrics());
  }

  // DeviceDimensionsHelper.convertPixelsToDp(25f, context) => (25px converted to dp)
  public static float convertPixelsToDp(float px, Context context){
      Resources r = context.getResources();
      DisplayMetrics metrics = r.getDisplayMetrics();
      float dp = px / (metrics.densityDpi / 160f);
      return dp;
  }
}