android用Popup弹出窗(PopupWindow的使用方式)

//设置窗口样式
pw = new PopupWindow(list, ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT);

显示方式

pw.showAtLocation(popupLayout, Gravity.BOTTOM,0,0);

PopupActivity.java

package com.example.a20200712;

import android.graphics.drawable.BitmapDrawable;
import android.os.Bundle;
import android.view.Gravity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.GridView;
import android.widget.LinearLayout;
import android.widget.PopupWindow;

import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;

public class PopupActivity extends AppCompatActivity {
    private LinearLayout popupLayout;
    private PopupWindow pw;
    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.popup_layout);
        View list = getLayoutInflater().inflate(R.layout.popup_list,null);
        pw = new PopupWindow(list, ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT);
        pw.setFocusable(true);//获得焦点
        pw.setBackgroundDrawable(new BitmapDrawable());//点空白处 隐藏popup
        popupLayout = findViewById(R.id.popup_layout_main);
    }

    public void onPopup(View view){
        pw.showAtLocation(popupLayout, Gravity.BOTTOM,0,0);
        //PopupWindow
    }


}

popup_layout.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/popup_layout_main">

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="onPopup"
        android:text="按扭"></Button>
    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="关闭"></Button>
</LinearLayout>

popup_list.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:background="@drawable/kf">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="客服"
        android:textColor="#777aaa"
        android:textSize="50dp"></TextView>
</LinearLayout>