Android开发：自定义控件PopuWindow

package com.example.linjun.sweepingrobot.userviews;

import android.content.Context;
import android.util.DisplayMetrics;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.WindowManager;
import android.widget.PopupWindow;

import com.example.linjun.sweepingrobot.R;

/**
 * Created by Vander on 2018/8/17.
 */

public class MyPopupWindow {

    PopupWindow window;
    Context mContext;
    View baseView;

    WindowManager wm;
    DisplayMetrics dm = new DisplayMetrics();


    public interface OnDismissListener{
        void onDismiss();
    }

    OnDismissListener mOnDismissListener;
    public void setOnDismissListener(OnDismissListener listener){
        mOnDismissListener = listener;
    }

    public MyPopupWindow(Context context, View baseView){
        this.mContext = context;
        this.baseView = baseView;
        wm = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
        wm.getDefaultDisplay().getMetrics(dm);


        View contentView = LayoutInflater.from(context).inflate(R.layout.dialog_more_btn, null, false);
        window = new PopupWindow(contentView, (int)(dm.widthPixels - dip2px(2)), (int)dip2px(32f), true);
        //window.setFocusable(false);
        window.setOutsideTouchable(true);
        window.setOnDismissListener(new PopupWindow.OnDismissListener() {
            @Override
            public void onDismiss() {
                if(mOnDismissListener != null) {
                    mOnDismissListener.onDismiss();
                }
            }
        });
    }

    public  float dip2px(float dpValue) {
        float scale = mContext.getResources().getDisplayMetrics().density;
        return (dpValue * scale + 0.5f) * 5f;
    }

    public void showWindow(int x, int y){
        if(window != null){
            if(window.isShowing()){
                window.dismiss();
            }
            window.showAtLocation(baseView, 0, (int)dip2px(x), y);
        }
    }

    public int getWindowWidth(){
        return window.getWidth();
    }

    public int getWindowHeight(){
        return window.getHeight();
    }


    public boolean isShowing(){
        if(window != null){
            return window.isShowing();
        }
        return false;
    }

    public void dismiss(){
        if (window != null){
            if (window.isShowing()){
                window.dismiss();
            }
        }
    }

}