Android编程实现修改标题栏位置使其居中的方法

package com.example.libraryclient;
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.Window;
import com.example.R;
public class HomePageActivity extends Activity{
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//设置布局
requestWindowFeature(Window.FEATURE_CUSTOM_TITLE); 
setContentView(R.layout.activity_homepage);
getWindow().setFeatureInt(Window.FEATURE_CUSTOM_TITLE,R.layout.title);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
return super.onCreateOptionsMenu(menu);
}
}