public class DisplayUtils {
  /**
   * convert px to its equivalent dp
   * 將px轉(zhuǎn)換為與之相等的dp
   */
  public static int px2dp(Context context, float pxValue) {
    final float scale = context.getResources().getDisplayMetrics().density;
    return (int) (pxValue / scale + 0.5f);
  }
  /**
   * convert dp to its equivalent px
   * 將dp轉(zhuǎn)換為與之相等的px
   */
  public static int dp2px(Context context, float dipValue) {
    final float scale = context.getResources().getDisplayMetrics().density;
    return (int) (dipValue * scale + 0.5f);
  }
  /**
   * convert px to its equivalent sp 
   * 將px轉(zhuǎn)換為sp
   */
  public static int px2sp(Context context, float pxValue) {
    final float fontScale = context.getResources().getDisplayMetrics().scaledDensity;
    return (int) (pxValue / fontScale + 0.5f);
  }
  /**
   * convert sp to its equivalent px
   * 將sp轉(zhuǎn)換為px
   */
  public static int sp2px(Context context, float spValue) {
    final float fontScale = context.getResources().getDisplayMetrics().scaledDensity;
    return (int) (spValue * fontScale + 0.5f);
  }
}

/**
* convert dp to its equivalent px
*/
protected int dp2px(int dp){
    return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dp,getResources().getDisplayMetrics());
}
/**
* convert sp to its equivalent px
*/
protected int sp2px(int sp){
    return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP, sp,getResources().getDisplayMetrics());
}
public class TypedValue {
  ...
  /** {@link #TYPE_DIMENSION} complex unit: Value is raw pixels. */
  public static final int COMPLEX_UNIT_PX = 0;
  /** {@link #TYPE_DIMENSION} complex unit: Value is Device Independent
   * Pixels. */
  public static final int COMPLEX_UNIT_DIP = 1;
  /** {@link #TYPE_DIMENSION} complex unit: Value is a scaled pixel. */
  public static final int COMPLEX_UNIT_SP = 2;
  /** {@link #TYPE_DIMENSION} complex unit: Value is in points. */
  public static final int COMPLEX_UNIT_PT = 3;
  /** {@link #TYPE_DIMENSION} complex unit: Value is in inches. */
  public static final int COMPLEX_UNIT_IN = 4;
  /** {@link #TYPE_DIMENSION} complex unit: Value is in millimeters. */
  public static final int COMPLEX_UNIT_MM = 5;
  /**
   * Converts an unpacked complex data value holding a dimension to its final floating 
   * point value. The two parameters <var>unit</var> and <var>value</var>
   * are as in {@link #TYPE_DIMENSION}.
   * 
   * @param unit The unit to convert from.
   * @param value The value to apply the unit to.
   * @param metrics Current display metrics to use in the conversion -- 
   *        supplies display density and scaling information.
   * 
   * @return The complex floating point value multiplied by the appropriate 
   * metrics depending on its unit. 
   */
  public static float applyDimension(int unit, float value,
                    DisplayMetrics metrics)
  {
    switch (unit) {
    case COMPLEX_UNIT_PX:
      return value;
    case COMPLEX_UNIT_DIP:
      return value * metrics.density;
    case COMPLEX_UNIT_SP:
      return value * metrics.scaledDensity;
    case COMPLEX_UNIT_PT:
      return value * metrics.xdpi * (1.0f/72);
    case COMPLEX_UNIT_IN:
      return value * metrics.xdpi;
    case COMPLEX_UNIT_MM:
      return value * metrics.xdpi * (1.0f/25.4f);
    }
    return 0;
  }
  ...
}