android_图片px转dp

</pre><pre name="code" class="java">package com.lengxiaocai.myutil.screentool;

import android.content.Context;

/**
 * 
 * @ClassName: ScreenTool
 * 
 * @Description: 屏幕像素检测
 * 
 * @author yazhizhao
 * 
 * @date 2014-5-6 上午11:47:07
 */
public class ScreenTool {

	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 int px2sp(float pxValue, float fontScale) {
		return (int) (pxValue / fontScale + 0.5f);
	}

	public static int sp2px(float spValue, float fontScale) {
		return (int) (spValue * fontScale + 0.5f);
	}

}