经过多番測试实践，实现了popupwindow 弹出在指定控件的下方。代码上有凝视。有须要注意的地方。popupwindow 有自已的布局，里面控件的监听实现都有。接下来看代码实现。

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TestPopwindow2.class

package com.example.popwindowdemo;

import android.app.ActionBar.LayoutParams;
import android.app.Activity;
import android.content.Context;
import android.graphics.drawable.BitmapDrawable;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.PopupWindow;

public class TestPopwindow2 extends PopupWindow {
  // 根视图
  private View mRootView;
  // LayoutInflater
  LayoutInflater mInflater;

  public TestPopwindow2(Activity context) {
    super(context);
    mInflater = (LayoutInflater) context
        .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    mRootView = mInflater.inflate(R.layout.test_popwindow_2, null);
    setContentView(mRootView);

    this.setWidth(LayoutParams.WRAP_CONTENT);
    this.setHeight(LayoutParams.WRAP_CONTENT);

    // 设置PopUpWindow弹出的相关属性
    setTouchable(true);
    setOutsideTouchable(true);
    setFocusable(true);
    setBackgroundDrawable(new BitmapDrawable(context.getResources()));
    update();

    getContentView().setFocusableInTouchMode(true);
    getContentView().setFocusable(true);
    setAnimationStyle(R.style.AppBaseTheme);
  }
}

MainActivity.class

package com.example.popwindowdemo;

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

public class MainActivity extends Activity implements OnClickListener,
    OnDismissListener {

  private TestPopwindow2 mTestPopwindow2 = null;

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

    InitUI();

  }

  private void InitUI() {
    // 实例化TestPopwindow2
    mTestPopwindow2 = new TestPopwindow2(this);
    // 设置点击其它位置mTestPopwindow2消失
    mTestPopwindow2.setOnDismissListener(this);

    Button buttonTest2 = (Button) findViewById(R.id.buttonTest2);
    buttonTest2.setOnClickListener(this);
  }

  private void OnPopwindowTest2() {
    if (mTestPopwindow2 == null)
      return;

    // location获得控件的位置
    int[] location = new int[2];
    View v = findViewById(R.id.buttonTest2);
    if (v != null)
      v.getLocationOnScreen(location);   // 控件在屏幕的位置
    mTestPopwindow2.setAnimationStyle(R.style.AppBaseTheme);

    // mTestPopwindow2弹出在某控件(button)的以下
    mTestPopwindow2.showAtLocation(v, Gravity.TOP | Gravity.LEFT,
        location[0] - v.getWidth(), location[1] + v.getHeight());
  }

  // mTestPopwindow2布局控件的监听
  public void OnclickTestListener(View view) {
    switch (view.getId()) {
    case R.id.layoutSeclect1:
      Toast.makeText(this, "系统热门方案", Toast.LENGTH_SHORT).show();
      break;
    case R.id.layoutSeclect2:
      Toast.makeText(this, "个人热门方案", Toast.LENGTH_SHORT).show();
      break;
    default:
      break;
    }
    if (mTestPopwindow2 != null)
      mTestPopwindow2.dismiss();
  }

  @Override
  public void onClick(View v) {
    switch (v.getId()) {
    case R.id.buttonTest2:
      OnPopwindowTest2();
      break;
    default:
      break;
    }
  }

  // 点击其它地方消失
  @Override
  public void onDismiss() {
  }
}

test_popwindow_2.xml

<?xml version="1.0" encoding="UTF-8"?
>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="#0000" >

    <!--
  popupwimdow的布局注意不能使用相似        
    android:layout_marginTop=""这样属性,特别是相对布局时候. 
  布局或者控件总体靠左等都会影响popupwimdow定位使用
    -->

    <LinearLayout
        android:id="@+id/hot_layout"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="@drawable/title_function_bg"
        android:orientation="vertical" >

        <LinearLayout
            android:id="@+id/layoutSeclect1"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:clickable="true"
            android:onClick="OnclickTestListener" >

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:padding="8dp"
                android:text="系统热门方案"
                android:textColor="#fff"
                android:textSize="18sp" />
        </LinearLayout>

        <LinearLayout
            android:id="@+id/layoutSeclect2"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:clickable="true"
            android:onClick="OnclickTestListener" >

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:padding="8dp"
                android:text="个人热门方案"
                android:textColor="#fff"
                android:textSize="18sp" />
        </LinearLayout>
    </LinearLayout>

</LinearLayout>

activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/LinearLayoutMain"
    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="@string/hello_world" />


    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="right">

    <Button
        android:id="@+id/buttonTest2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="測试2" />
    </LinearLayout>

</LinearLayout>

效果图例如以下

Android popupwindow 演示样例程序一_控件