MainActivity
[java]
package com.example.titlebar;

import android.os.Bundle;
import android.app.Activity;
import android.graphics.Color;
import android.support.v4.view.ViewGroupCompat;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.view.ViewGroupOverlay;
import android.view.Window;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity {
private TextView myTextView;

private void getTextView(ViewGroup vg){
int tCount = vg.getChildCount();
for(int i = 0; i < tCount; i++){
View myView = vg.getChildAt(i);
if (myView instanceof ViewGroup) {
getTextView((ViewGroup) myView);
}else if(myView instanceof View) {
Log.d("obob","gbgb");
if (myView instanceof TextView && myTextView == null) {
Log.d("obob","gbgb11");
myTextView = (TextView) myView;
}
}
}
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

Window w = getWindow();
ViewGroup v = (ViewGroup) w.getDecorView();

getTextView(v);

if (myTextView != null) {
myTextView.setText("标题发生变化");
myTextView.setTextColor(Color.RED);
myTextView.setBackgroundColor(Color.BLUE);
myTextView.setClickable(true);

myTextView.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Toast.makeText(MainActivity.this, "单击标题文字", Toast.LENGTH_LONG).show();

}
});
}
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}

}
[/java]
布局文件[xml]
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >

</LinearLayout>[/xml]
完整项目源码文件
http://pan.baidu.com/s/1bnAFI4R