自定义Activity的标题栏

MyActivity.java 

requestWindowFeature(Window.FEATURE_CUSTOM_TITLE);  
setContentView(R.layout.main);         
getWindow().setFeatureInt(Window.FEATURE_CUSTOM_TITLE, R.layout.title);  
TextView titleTV = (TextView)findViewById(R.id.title);  
titleTV.setText(R.string.app_name); 

title.xml

<?xml version="1.0" encoding="UTF-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"     
android:orientation="horizontal"    
android:layout_width="fill_parent"     
android:layout_height="fill_parent"     >    
<TextView         
android:id="@+id/title"         
android:layout_width="wrap_content"         
android:layout_height="wrap_content"         
android:layout_weight="1"         
android:layout_gravity="center"         
android:gravity="center" />
</LinearLayout>