Android PopupWindow底部菜单

import java.util.Timer;
import java.util.TimerTask;

import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup.LayoutParams;
import android.widget.PopupWindow;

public class MainActivity extends Activity {
private Handler handler = new Handler() {
public void handleMessage(Message msg) {
switch (msg.arg1) {
case 1:
showBottomMenu();
break;
}
}
};

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

Timer timer = new Timer();
timer.schedule(new initBottomMenu(), 100);
}

private class initBottomMenu extends TimerTask {
@Override
public void run() {
Message msg = new Message();
msg.arg1 = 1;
handler.sendMessage(msg);
}
}

/**
* 显示底部菜单
*/
public void showBottomMenu() {
LayoutInflater mLayoutInfalter = (LayoutInflater) this
.getSystemService(LAYOUT_INFLATER_SERVICE);
View menuView = mLayoutInfalter.inflate(R.layout.menu, null);
PopupWindow mPopupWindow = new PopupWindow(menuView,
LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT);

mPopupWindow.showAtLocation(findViewById(R.id.main), Gravity.BOTTOM, 0,
0);
}
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/main"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="底部菜单实例"
/>
</LinearLayout>

<?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:orientation="horizontal"
android:background="@drawable/menu_back">
<Button
android:id="@+id/menu_ensureButton"
android:layout_width="160px"
android:layout_height="wrap_content"
android:layout_marginTop="5px"
android:text="完成"
/>
<Button
android:id="@+id/menu_cancelButton"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginTop="5px"
android:text="取消"
/>
</LinearLayout>