Android SizeUtils-尺寸相关工具类

来源：互联网发布：知识更新速度数据编辑：程序博客网时间：2024/06/06 10:56
SizeUtils是一个尺寸相关工具类
功能:
1.dp转px
2.px转dp
3.sp转px
4.px转sp
5.各种单位转换
6.在onCreate()即可强行获取View的尺寸
7.获取到View尺寸的监听
8. ListView中提前测量View尺寸，如headerView
<span style="font-size:18px;background-color: rgb(255, 255, 255);">package com.blankj.utilcode.utils;import android.content.Context;import android.util.DisplayMetrics;import android.util.Log;import android.util.TypedValue;import android.view.View;/** * <pre> *     author: Blankj *     blog  : http://blankj.com *     time  : 2016/8/2 *     desc  : 尺寸相关工具类 * </pre> */public class SizeUtils {    private SizeUtils() {        throw new UnsupportedOperationException("u can't instantiate me...");    }    /**     * dp转px     *     * @param context 上下文     * @param dpValue dp值     * @return px值     */    public static int dp2px(Context context, float dpValue) {        final float scale = context.getResources().getDisplayMetrics().density;        return (int) (dpValue * scale + 0.5f);    }    /**     * px转dp     *     * @param context 上下文     * @param pxValue px值     * @return dp值     */    public static int px2dp(Context context, float pxValue) {        final float scale = context.getResources().getDisplayMetrics().density;        return (int) (pxValue / scale + 0.5f);    }    /**     * sp转px     *     * @param context 上下文     * @param spValue sp值     * @return px值     */    public static int sp2px(Context context, float spValue) {        final float fontScale = context.getResources().getDisplayMetrics().scaledDensity;        return (int) (spValue * fontScale + 0.5f);    }    /**     * px转sp     *     * @param context 上下文     * @param pxValue px值     * @return sp值     */    public static int px2sp(Context context, float pxValue) {        final float fontScale = context.getResources().getDisplayMetrics().scaledDensity;        return (int) (pxValue / fontScale + 0.5f);    }    /**     * 各种单位转换     * <p>该方法存在于TypedValue</p>     *     * @param unit    单位     * @param value   值     * @param metrics DisplayMetrics     * @return 转换结果     */    public static float applyDimension(int unit, float value, DisplayMetrics metrics) {        switch (unit) {            case TypedValue.COMPLEX_UNIT_PX:                return value;            case TypedValue.COMPLEX_UNIT_DIP:                return value * metrics.density;            case TypedValue.COMPLEX_UNIT_SP:                return value * metrics.scaledDensity;            case TypedValue.COMPLEX_UNIT_PT:                return value * metrics.xdpi * (1.0f / 72);            case TypedValue.COMPLEX_UNIT_IN:                return value * metrics.xdpi;            case TypedValue.COMPLEX_UNIT_MM:                return value * metrics.xdpi * (1.0f / 25.4f);        }        return 0;    }    /**     * 在onCreate()即可强行获取View的尺寸     * <p>需回调onGetSizeListener接口，在onGetSize中获取view宽高</p>     * <p>用法示例如下所示</p>     * <pre>     * SizeUtils.forceGetViewSize(view, new SizeUtils.onGetSizeListener() {     *     Override     *     public void onGetSize(View view) {     *         view.getWidth();     *     }     * });     * </pre>     *     * @param view     视图     * @param listener 监听器     */    public static void forceGetViewSize(final View view, final onGetSizeListener listener) {        view.post(new Runnable() {            @Override            public void run() {                if (listener != null) {                    listener.onGetSize(view);                }            }        });    }    /**     * 获取到View尺寸的监听     */    public interface onGetSizeListener {        void onGetSize(View view);    }    public static void setListener(onGetSizeListener listener) {        mListener = listener;    }    private static onGetSizeListener mListener;    /**     * ListView中提前测量View尺寸，如headerView     * <p>用的时候去掉注释拷贝到ListView中即可</p>     * <p>参照以下注释代码</p>     *     * @param view 视图     */    public static void measureViewInLV(View view) {        Log.d("tips", "U should copy the following code.");        /*        ViewGroup.LayoutParams p = view.getLayoutParams();        if (p == null) {            p = new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,                    ViewGroup.LayoutParams.WRAP_CONTENT);        }        int width = ViewGroup.getChildMeasureSpec(0, 0, p.width);        int height;        int tempHeight = p.height;        if (tempHeight > 0) {            height = MeasureSpec.makeMeasureSpec(tempHeight,                    MeasureSpec.EXACTLY);        } else {            height = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED);        }        view.measure(width, height);        */    }}</span>
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