Android获取窗体信息的Util方法

package com.wangyi.tools;

import android.app.Activity;
import android.util.DisplayMetrics;

public class DisplayUtils {
    
    private static DisplayUtils instance;
    private Activity mActivity;
    private DisplayUtils(Activity mActivity){
        this.mActivity=mActivity;
    }
    public static DisplayUtils getInstance(Activity mActivity){
        if(instance==null){
            instance=new DisplayUtils(mActivity);
        }
        return instance;
    }
    public final  int[] getScreenSize(){
        int[] size=new int[2];
        DisplayMetrics dm = new DisplayMetrics();
        mActivity.getWindowManager().getDefaultDisplay().getMetrics(dm);
        size[0]=dm.widthPixels;
        size[1]=dm.heightPixels;
        return size;
    }
    public final static int getWindowWidth(Activity mActivity) {
        DisplayMetrics dm = new DisplayMetrics();
        mActivity.getWindowManager().getDefaultDisplay().getMetrics(dm);
        return dm.widthPixels;
    }

    public final static int getWindowHeight(Activity mActivity) {
        DisplayMetrics dm = new DisplayMetrics();
        mActivity.getWindowManager().getDefaultDisplay().getMetrics(dm);
        return dm.heightPixels;
    }
}