Android标题栏中添加返回按钮功能

public class CustomTitle {  
  private static Activity mActivity;  
  public static void getCustomTitle(Activity activity, String title) { 
   mActivity = activity; 
    mActivity.requestWindowFeature(Window.FEATURE_CUSTOM_TITLE); 
   mActivity.setContentView(R.layout.custom_title); 
    mActivity.getWindow().setFeatureInt(Window.FEATURE_CUSTOM_TITLE, 
        R.layout.custom_title);     
    TextView textView = (TextView) activity.findViewById(R.id.head_center_text);  
    textView.setText(title);  
   Button titleBackBtn = (Button) activity.findViewById(R.id.TitleBackBtn);  
    titleBackBtn.setOnClickListener(new OnClickListener() {  
      public void onClick(View v) {  
       Log.d("Title back","key down"); 
         
        mActivity.finish(); 
      }  
    });  
  } 
} 

<&＃63;xml version="1.0" encoding="utf-8"&＃63;> 
   
        
    
 

public class InformationActivity extends Activity{ 
  @Override 
  protected void onCreate(Bundle savedInstanceState) { 
    // TODO Auto-generated method stub     
super.onCreate(savedInstanceState);          
   CustomTitle.getCustomTitle(this, "个人信息"); 
    setContentView(R.layout.informationactivity); 
  ....................... 
  } 
} 

     android:name="com.xxx.InformationActivity" 
      android:theme="@style/MyCustomTheme" 
      android:screenOrientation="landscape" />