Android的DisplayUtil

public class DisplayUtil {
    /**
     * 将px装换成dp，保证尺寸不变
     * @param context
     * @param pxValue
     * @return
     */
    public static int px2dp(Context context,float pxValue){
        float density = context.getResources().getDisplayMetrics().density;//得到设备的密度
        return (int) (pxValue/density+0.5f);
    }
    public static int dp2px(Context context,float dpValue){
        float density = context.getResources().getDisplayMetrics().density;
        return (int) (dpValue*density+0.5f);
    }
    public static int px2sp(Context context,float pxValue){
        float scaleDensity = context.getResources().getDisplayMetrics().scaledDensity;//缩放密度
        return (int) (pxValue/scaleDensity+0.5f);
    }
    public static int sp2px(Context context,float spValue) {
        float scaleDensity = context.getResources().getDisplayMetrics().scaledDensity;
        return (int) (spValue*scaleDensity+0.5f);
    }
}