直接上程式碼。
首先是佈局：
activity_main.xml中：

<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"
     >

    <Button
        android:id="@+id/start"
        android:layout_width
 
="wrap_content"
        android:layout_height="wrap_content"
        android:text="點選彈出" />

</RelativeLayout>

然後popwindowlayout.xml中程式碼：

<?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="wrap_content"
    android:layout_margin="5dp"
    android:background="@drawable/layout_shape"
    android:orientation="vertical" >

    <Button
        android:id="@+id/first"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginBottom
 
="5dp"
        android:layout_marginLeft="10dp"
        android:layout_marginRight="10dp"
        android:layout_marginTop="5dp"
        android:background="@drawable/btn_shape"
        android:text="一" />

    <Button
        android:id="@+id/second"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginBottom="5dp"
        android:layout_marginLeft="10dp"
        android:background="@drawable/btn_shape"
        android:layout_marginRight="10dp"
        android:text="二" />

    <Button
        android:id="@+id/third"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginBottom="5dp"
        android:layout_marginLeft="10dp"
        android:background="@drawable/btn_shape"
        android:layout_marginRight="10dp"
        android:text="三" />

</LinearLayout>

然後，兩個動畫:
popshow_anim.xml

<set xmlns:android="http://schemas.android.com/apk/res/android">
     <translate
        android:duration="1000"
        android:fromYDelta="100%p"
        android:toYDelta="0" />

    <alpha
        android:duration="1000"
        android:fromAlpha="0.0"
        android:toAlpha="1.0" />
</set>

pophidden_anim.xml:

<set xmlns:android="http://schemas.android.com/apk/res/android">

     <translate
        android:duration="1000"
        android:fromYDelta="0"
        android:toYDelta="50%p" />

    <alpha
        android:duration="1000"
        android:fromAlpha="1.0"
        android:toAlpha="0.0" />
</set>

再次。兩個shape檔案：
btn_shape.xml

<shape xmlns:android="http://schemas.android.com/apk/res/android">    
    <corners android:topLeftRadius="8dp"   
                    android:topRightRadius="8dp"    
                android:bottomRightRadius="8dp"   
                android:bottomLeftRadius="8dp"/>    
</shape>  

layout_shape.xml：

<shape xmlns:android="http://schemas.android.com/apk/res/android">    
    <solid android:color="#f4f4f4" />    
    <corners android:topLeftRadius="8dp"   
                    android:topRightRadius="8dp"    
                />    
</shape>  

最後，MainActivity程式碼：

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button start = (Button) findViewById(R.id.start);
        start.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                showPopwindow();
            }

        });

    }
    private void showPopwindow() {
        LayoutInflater inflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        View view = inflater.inflate(R.layout.popwindowlayout, null);
        PopupWindow window = new PopupWindow(view,
                WindowManager.LayoutParams.MATCH_PARENT,
                WindowManager.LayoutParams.WRAP_CONTENT);
        window.setFocusable(true);

        ColorDrawable dw = new ColorDrawable(0xffffffff);
        window.setBackgroundDrawable(dw);

        window.setAnimationStyle(R.style.PopupAnimation);
        window.showAtLocation(MainActivity.this.findViewById(R.id.start),
                Gravity.BOTTOM, 0, 0);
        Button first = (Button) view.findViewById(R.id.first);
        first.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {


            }
        });

        window.setOnDismissListener(new OnDismissListener() {

            @Override
            public void onDismiss() {

            }
        });

    }
}

當然，還需要在style.xml檔案中定義動畫樣式。

<style name="PopupAnimation">          
        <item name="android:windowEnterAnimation">@anim/popshow_anim</item>     
        <item name="android:windowExitAnimation">@anim/pophidden_anim</item>     
    </style> 

完。效果如下