layout中包含另一个layout

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<include layout="@layout/title" />

</LinearLayout>

titleone:

<?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:background="@drawable/bg"
    android:orientation="horizontal" >
    
    <Button 
        android:id="@+id/btnback"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:layout_margin="7px"
        android:gravity="left"
        android:background="@drawable/cancel"
        />
    
    <TextView 
        android:id="@+id/txttitle"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:layout_gravity="center"
        android:textSize="50px"
        android:layout_weight="20"
        android:text="title"
        />
    
    <Button 
        android:id="@+id/btnclose"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:gravity="right"
        android:layout_margin="7px"
        android:layout_weight="1"
        android:background="@drawable/close"
        />


</LinearLayout>

java：

package com.base.title;


import com.example.test02.R;


import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.widget.Button;
import android.app.Activity;


public class TitleOneActivity extends Activity {


Button btnBack;
Button btnClose;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.activity_title_one);
btnBack = (Button)findViewById(R.id.btnback);
btnClose = (Button)findViewById(R.id.btnclose);

btnClose.setOnClickListener(new OnClickListener() {
public void onClick(View arg0) {
finish();
}
});
}


}

效果图：