dp2px,px2dp,sp2px,px2sp

ViewUtils.java

public class ViewUtils {

    private ViewUtils() {
    }

    public static String formatSpecMode(int mode) {
        String format;
        switch (mode) {
            case View.MeasureSpec.EXACTLY:
                format = "EXACTLY";
                break;
            case View.MeasureSpec.AT_MOST:
                format = "AT_MOST";
                break;
            case View.MeasureSpec.UNSPECIFIED:
                format = "UNSPECIFIED";
                break;
            default:
                format = ">UNKNOWN_MODE " + mode + "<";
                break;
        }
        return format;
    }


    public static String logMeasureSpec(int spec, String description) {
        int mode = View.MeasureSpec.getMode(spec);
        int size = View.MeasureSpec.getSize(spec);
        String format = String.format(Locale.ENGLISH,
                "onMeasure of %s: size=%s, mode=%s",
                description, size, formatSpecMode(mode));
        return format;
    }


    /**
     * convert dp to its equivalent px
     */
    public static float dp2px(Context context, int dp) {
        return TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,
                dp, context.getResources().getDisplayMetrics());
    }

    /**
     * convert sp to its equivalent px
     */
    public static float sp2px(Context context, int sp) {
        return TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP,
                sp, context.getResources().getDisplayMetrics());
    }

    public static int px2sp(Context context, float pxValue) {
        final float fontScale = context.getResources().getDisplayMetrics().scaledDensity;
        return (int) (pxValue / fontScale + 0.5f);
    }

    public static int px2dp(Context context, float pxValue) {
        final float fontScale = context.getResources().getDisplayMetrics().density;
        return (int) (pxValue / fontScale + 0.5f);
    }
}