示例图：

MainActivity.java

package com.example.popupwindow;import androidx.appcompat.app.AppCompatActivity;import android.content.Context;
import android.graphics.drawable.ColorDrawable;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.PopupWindow;
import android.widget.Toast;public class MainActivity extends AppCompatActivity {//组件protected Button button;private Context context;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);context =this;button = findViewById(R.id.btn_start);//事件button.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {setPopupWindow(v);}});}private  void setPopupWindow(View v){//获取布局View view = LayoutInflater.from(context).inflate(R.layout.popupwindow_layout,null,false);Button butTit = view.findViewById(R.id.btn_tit);Button btnClose = view.findViewById(R.id.btn_close);// 创建一个 PopupWindow (视图，宽度，高度，焦点)//ViewGroup.LayoutParams.WRAP_CONTENT 自适应内容// true 可以弹出PopupWindow popupWindow = new PopupWindow(view, ViewGroup.LayoutParams.WRAP_CONTENT,ViewGroup.LayoutParams.WRAP_CONTENT,true);//设置可以消失popupWindow.setTouchable(true);popupWindow.setTouchInterceptor(new View.OnTouchListener() {@Overridepublic boolean onTouch(View v, MotionEvent event) {// true ,touch 事件会被拦截， onTouchEvent不会被调用，点击外面区域不能被关闭return false;}});//设置背景颜色popupWindow.setBackgroundDrawable(new ColorDrawable(0xff00ff00));//设置popupWindow 视图弹出位置popupWindow.showAsDropDown(v,200,0);//按钮点击事件butTit.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {Toast.makeText(context,"点击了温馨提示",Toast.LENGTH_SHORT).show();}});btnClose.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {//消失的方法popupWindow.dismiss();}});}}

主布局 activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:app="http://schemas.android.com/apk/res-auto"xmlns:tools="http://schemas.android.com/tools"android:layout_width="match_parent"android:layout_height="match_parent"tools:context=".MainActivity"><Buttonandroid:id="@+id/btn_start"android:layout_width="match_parent"android:layout_height="wrap_content"android:textSize="24sp"android:text="按钮"/></LinearLayout>

弹出框布局 popupwindow_layout.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:orientation="vertical"android:layout_height="match_parent"><Buttonandroid:id="@+id/btn_tit"android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="温馨提示"android:textSize="24sp"/><Buttonandroid:id="@+id/btn_close"android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="点击关闭"android:textSize="24sp"/>
</LinearLayout>