Android PopupWindow的简单使用示例

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".PopupWindowTest" >

    <Button 
        android:id="@+id/bn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="弹出窗口"
        />

</RelativeLayout>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".PopupWindowTest" >

    <TextView 
        android:id="@+id/popup_tv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:text="我是弹出窗口"
        />
    
    <Button 
        android:id="@+id/close"
        android:layout_below="@id/popup_tv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:text="关闭"
        />

</RelativeLayout>

package com.example.popupwindowtest;

import android.os.Bundle;
import android.app.Activity;
import android.view.Gravity;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.PopupWindow;

public class PopupWindowTest extends Activity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_popup_window_test);
		//装载R.layout.popup对应的界面布局
		View root = this.getLayoutInflater().inflate(R.layout.popup, null);
		//创建PopupWindow对象
		final PopupWindow popup = new PopupWindow(root,280,360);
		Button button = (Button) findViewById(R.id.bn);
		button.setOnClickListener(new OnClickListener()
		{

			@Override
			public void onClick(View v) {
				// TODO Auto-generated method stub
				//以下拉方式显示
				//popup.showAsDropDown(v);
				//将Popupwindow显示在指定位置
				popup.showAtLocation(findViewById(R.id.bn), Gravity.CENTER, 20, 20);
			}
			
		});
		
		root.findViewById(R.id.close).setOnClickListener(
			new View.OnClickListener() {
				
				@Override
				public void onClick(View v) {
					// TODO Auto-generated method stub
					popup.dismiss();
				}
			});
		}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.popup_window_test, menu);
		return true;
	}

}