Android开发之PopupWindow实现弹窗效果

<?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">

    <Button
        android:text="Popup"
        android:onClick="Popup"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>


</LinearLayout>

<?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:background="@mipmap/ic_launcher"
    android:orientation="vertical">

    <Button
        android:id="@+id/btn1"
        android:text="Button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>

    <Button
        android:id="@+id/btn2"
        android:text="Button2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>


</LinearLayout>

package com.example.mypopupwindow;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.PopupWindow;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

    public void Popup(View view) {
        View popup_view=getLayoutInflater().inflate(R.layout.popup_view,null);
        PopupWindow window=new PopupWindow(popup_view, ViewGroup.LayoutParams.WRAP_CONTENT
                ,ViewGroup.LayoutParams.WRAP_CONTENT);
        window.showAsDropDown(view);
    }
}

package com.example.mypopupwindow;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.PopupWindow;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }
    public void Popup(View view) {
        View popup_view=getLayoutInflater().inflate(R.layout.popup_view,null);
        Button btn1=popup_view.findViewById(R.id.btn1);
        Button btn2=popup_view.findViewById(R.id.btn2);

        PopupWindow window=new PopupWindow(popup_view, ViewGroup.LayoutParams.WRAP_CONTENT
                ,ViewGroup.LayoutParams.WRAP_CONTENT,true);
        window.setBackgroundDrawable(getResources().getDrawable(R.drawable.image));
        window.showAsDropDown(view);

        btn1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Log.e("ShadyPi","btn1");
                window.dismiss();
            }
        });
        btn2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Log.e("ShadyPi","btn2");
                window.dismiss();
            }
        });
    }
}