package com.example.datalibrary.view;
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import android.content.Context;
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import android.graphics.Paint;
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import android.view.View;
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/**
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* Created by littlejie on 2017/2/22.
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*/
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public class MiscUtil {
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/**
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* 测量 View
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*
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* @param measureSpec
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* @param defaultSize View 的默认大小
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* @return
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*/
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public static int measure(int measureSpec, int defaultSize) {
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int result = defaultSize;
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int specMode = View.MeasureSpec.getMode(measureSpec);
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int specSize = View.MeasureSpec.getSize(measureSpec);
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if (specMode == View.MeasureSpec.EXACTLY) {
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result = specSize;
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} else if (specMode == View.MeasureSpec.AT_MOST) {
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result = Math.min(result, specSize);
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}
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return result;
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}
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/**
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* dip 转换成px
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*
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* @param dip
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* @return
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*/
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public static int dipToPx(Context context, float dip) {
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float density = context.getResources().getDisplayMetrics().density;
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return (int) (dip * density + 0.5f * (dip >= 0 ? 1 : -1));
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}
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/**
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* 获取数值精度格式化字符串
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*
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* @param precision
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* @return
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*/
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public static String getPrecisionFormat(int precision) {
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return "%." + precision + "f";
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}
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/**
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* 反转数组
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*
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* @param arrays
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* @param <T>
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* @return
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*/
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public static <T> T[] reverse(T[] arrays) {
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if (arrays == null) {
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return null;
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}
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int length = arrays.length;
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for (int i = 0; i < length / 2; i++) {
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T t = arrays[i];
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arrays[i] = arrays[length - i - 1];
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arrays[length - i - 1] = t;
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}
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return arrays;
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}
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/**
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* 测量文字高度
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* @param paint
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* @return
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*/
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public static float measureTextHeight(Paint paint) {
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Paint.FontMetrics fontMetrics = paint.getFontMetrics();
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return (Math.abs(fontMetrics.ascent) - fontMetrics.descent);
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}
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}
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