popwindow

<?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" >
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="请选择"
        />
    <RadioGroup
        android:id="@+id/rg"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        >
        <RadioButton
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="离线"
            />
        <RadioButton
             android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="隐身"
            />
          <RadioButton
             android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="在线"
            />

    </RadioGroup>

</LinearLayout>

弹出窗口的布局

<LinearLayout 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:orientation="vertical"
       >

    <TextView
        android:id="@+id/show"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="在线" />
    <Button
        android:id="@+id/btn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="状态"
        />

</LinearLayout>

主布局

package com.example.popwindow;

import android.os.Bundle;
import android.app.Activity;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.PopupWindow;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.RadioGroup.OnCheckedChangeListener;
import android.widget.TextView;

public class MainActivity extends Activity {
    private TextView show;
    private RadioGroup rg;
    private Button btn;
    private PopupWindow pop;
    private View v1;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        show = (TextView) findViewById(R.id.show);
        btn = (Button) findViewById(R.id.btn);
        btn.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                LayoutInflater in = LayoutInflater.from(MainActivity.this);
                v1 = in.inflate(R.layout.pop, null);//得到布局
                pop = new PopupWindow(v1,300,400 , true);//实例化弹出窗口
                rg = (RadioGroup) v1.findViewById(R.id.rg);//设置单选按钮点击事件
                rg.setOnCheckedChangeListener(new OnCheckedChangeListener() {

                    @Override
                    public void onCheckedChanged(RadioGroup group, int checkedId) {
                        //声明单选按钮     并且实例化
                        RadioButton rd = (RadioButton) v1.findViewById(group.getCheckedRadioButtonId());
                        show.setText(rd.getText().toString());
                        //关闭弹出窗口
                        pop.dismiss();
                    }
                });
                //显示弹出窗口          调用组件的按钮      位置              x,y
                pop.showAtLocation(btn, Gravity.CENTER, 0, 0);

            }

        });
    }
}