ContextUtils.java

package com.pan.simplepicture.utils;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.WindowManager;

/**
 * Created by sysadminl on 2015/11/10.
 */
public class ContextUtils {
    /**
     * 将px值转换为sp值，保证文字大小不变
     *
     * @param pxValue
     * @param fontScale
     *            （DisplayMetrics类中属性scaledDensity）
     * @return
     */
    public static int px2sp(Context context, float pxValue) {
        final float fontScale = context.getResources().getDisplayMetrics().scaledDensity;
        return (int) (pxValue / fontScale + 0.5f);
    }

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


    /**
     * 将sp值转换为px值，保证文字大小不变
     *
     * @param spValue
     * @param fontScale
     *            （DisplayMetrics类中属性scaledDensity）
     * @return
     */
    public static int sp2px(Context context, float spValue) {
        final float fontScale = context.getResources().getDisplayMetrics().scaledDensity;
        return (int) (spValue * fontScale + 0.5f);
    }

    private static LayoutInflater inflater;
    public static View inflate(Context context,int res){
        if(inflater==null) {
             inflater = LayoutInflater.from(context);
        }
        return inflater.inflate(res,null);
    }

    /**
     * 获取屏幕宽
     * @param context
     * @return
     */
    public static int getSreenWidth(Context context){
        WindowManager wm=(WindowManager)context.getSystemService(Context.WINDOW_SERVICE);
        return wm.getDefaultDisplay().getWidth();
    }

    /**
     * 获取屏幕高
     * @param context
     * @return
     */
    public static int getSreenHeight(Context context){
        WindowManager wm=(WindowManager)context.getSystemService(Context.WINDOW_SERVICE);
        return wm.getDefaultDisplay().getHeight();
    }
}