Util.java

package com.cjj;

import android.content.Context;

public class Util {

    public static int dip2px(Context context, float dpValue) {
        final float scale = context.getResources().getDisplayMetrics().density;
        return (int) (dpValue * scale + 0.5f);
    }

    public static int px2dip(Context context, float pxValue) {
        final float scale = context.getResources().getDisplayMetrics().density;
        return (int) (pxValue / scale + 0.5f);
    }

    public static float limitValue(float a, float b) {
        float valve = 0;
        final float min = Math.min(a, b);
        final float max = Math.max(a, b);
        valve = valve > min ? valve : min;
        valve = valve < max ? valve : max;
        return valve;
    }
}