AndroidのUI - PopupWindow - liguofeng29’s blog

activity_main.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:gravity="center_horizontal">
    <Button android:id="@+id/showbtn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="show POPUP"
        />
</LinearLayout>

popup.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:gravity="center_horizontal">
<ImageView 
   android:layout_width="240dp"
   android:layout_height="wrap_content"
   android:src="@drawable/hehe"
   />
<Button
   android:id="@+id/close"
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:text="关闭" 
   />
</LinearLayout>

MainActivity.java

package com.example.liguofeng.popupwindow;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Gravity;
import android.view.View;
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);
        
        View root = this.getLayoutInflater().inflate(R.layout.popup, null);

        final PopupWindow pop = new PopupWindow(root, 560, 720);
        Button showBtn = (Button) findViewById(R.id.showbtn);
        showBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                pop.showAsDropDown(v);
                pop.showAtLocation(findViewById(R.id.showbtn), Gravity.CENTER, 20, 20);
            }
        });

        // POP中のボタン
        root.findViewById(R.id.close).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                pop.dismiss(); // POPUP閉じる
            }
        });
    }
}