10.PopupWindow弹出窗口

一、popupWindow的常用方法

1.setContentView(View contentView): 设置PopupWindow显示的View<br />    2.showAsDropDown(View anchor): 相对某个控件的位置（正左下方），无偏移<br />    3.showAsDropDown(View anchor,int xoff,int yoff): 相对某个控件的位置，有偏移<br />    4.setFocusable(boolean focusable) 设置是否获取焦点<br />    5.setBackgroundDrawable(Drawable background) 设置背景<br />    6.dismiss() 关闭弹窗<br />    7.setAnimationStyle(int animationStyle) 设置加载动画<br />    8.setTouchable(boolean touchable) 设置触摸使能<br />    9.setOutsideTouchable(boolen touchable) 设置PopupWindow外面的触摸使能

二、popupWindow弹出窗口的实现

1.布局activity_main.xml代码

<?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">
    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="弹出popupwindow"
        android:onClick="btn_one"
        />
</LinearLayout>

2.自定义弹窗布局popup_view.xml代码

<?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"
    android:background="#ffff00"
    android:orientation="vertical">
    <Button
        android:id="@+id/btn_hangzhou"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="杭州"
        />
    <Button
        android:id="@+id/btn_xiamen"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="厦门"
        />
</LinearLayout>

3.MainActivity文件代码

package com.example.mypopupwindow;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
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 {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }
    public void btn_one(View view) {
        //2.创建popupView布局
        View popupView = getLayoutInflater().inflate(R.layout.popup_view, null);
        Button btn_hangzhou = popupView.findViewById(R.id.btn_hangzhou);
        Button btn_xiamen=popupView.findViewById(R.id.btn_xiamen);
        //1.创建popupWindow实例，将popupView布局放进去，自适应宽高
        final PopupWindow popupWindow = new PopupWindow(popupView, 
            ViewGroup.LayoutParams.WRAP_CONTENT,ViewGroup.LayoutParams.WRAP_CONTENT,true);
        //4.设置背景色
        popupWindow.setBackgroundDrawable(getResources().getDrawable(
                                   R.drawable.ic_launcher_background));
        //3.显示popupWindow，显示在按钮下方
        popupWindow.showAsDropDown(view);
        //5.设置按钮点击
        btn_hangzhou.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
               Toast.makeText(MainActivity.this, "你是住在杭州吗", Toast.LENGTH_SHORT).show();
                //6.取消弹窗
                popupWindow.dismiss();
            }
        });
        btn_xiamen.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
               Toast.makeText(MainActivity.this, "你是住在厦门吗", Toast.LENGTH_SHORT).show();
            }
        });
    }
}

4.效果图：<br />![image.png](https://cdn.nlark.com/yuque/0/2021/png/1574587/1622015319715-238fb331-5840-482c-897f-98737a2f3fd4.png#clientId=ubdd8c49e-8800-4&from=paste&height=439&id=u9d7b62a7&margin=%5Bobject%20Object%5D&name=image.png&originHeight=439&originWidth=776&originalType=binary&size=66450&status=done&style=none&taskId=u29b54904-4e01-42db-b103-5b9b1e86346&width=776)