安卓-屏幕显示

package com.example.helloworld;

import android.content.Context;
import android.util.DisplayMetrics;
import android.view.WindowManager;

public class CommonUtils {
    /**
     * dp转px
     * @param context
     * @param dpvalue
     * @return
     */
    public static int dip2px(Context context, float dpvalue) {
        float scale = context.getResources().getDisplayMetrics().density;
        return (int) (dpvalue * scale + 0.5f);//四舍五入取整
    }

    /**
     * px转dp
     * @param context
     * @param pxValue
     * @return
     */
    public static int px2dip(Context context, float pxValue) {
        float scale = context.getResources().getDisplayMetrics().density;
        return (int) (pxValue / scale + 0.5f);//四舍五入取整
    }

    /**
     * 获取屏幕像素密度
     *
     * @param ctx
     * @return
     */
    public static float getScreenDensity(Context ctx) {
        //从系统中获取窗口管理器
        WindowManager wm = (WindowManager) ctx.getSystemService(Context.WINDOW_SERVICE);
        DisplayMetrics dm = new DisplayMetrics();
        wm.getDefaultDisplay().getMetrics(dm);
        return dm.density;
    }

    /**
     * 获取屏幕的宽度
     *
     * @param ctx
     * @return
     */
    public static int getScreenWidth(Context ctx) {
        WindowManager wm = (WindowManager) ctx.getSystemService(Context.WINDOW_SERVICE);
        DisplayMetrics dm = new DisplayMetrics();
        wm.getDefaultDisplay().getMetrics(dm);
        return dm.widthPixels;
    }

    /**
     * 获取屏幕的高度
     * @param ctx
     * @return
     */
    public static int getScreenHeight(Context ctx) {
        WindowManager wm = (WindowManager) ctx.getSystemService(Context.WINDOW_SERVICE);
        DisplayMetrics dm = new DisplayMetrics();
        wm.getDefaultDisplay().getMetrics(dm);
        return dm.heightPixels;
    }
}