Android the Util method for getting form information

Android Util method to get form information, the method is very simple, there is no more nonsense, directly on the code

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;
  }
}

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