因为TabActivity 里本身有个TitleBar，如果Tab里的Activity还想自定义TitleBar的话、会冲突，因为不能同时显示两个TitleBar、、

    这里我们要在Tab里的Activity持有TabActivity的引用，这样就能在显示某Activity时动态地自定义标题栏。。

    需要注意的是标题栏在TabActivity 里，所以要想找到标题栏的Button等等对象就到通过持有的引用来找了、、、

    特别要注意的就是找标题栏对象，得在onResume里自定义标题栏之后，也就是把titlebar layout载入TabActivity之后再找，郁闷了我好久、、、哦哦

查看更多自定义标题栏方法：http://blog.csdn.net/xixinyan/article/details/6931019

    遇到的问题：当在不同的activity切换时，或者某activity因为用户输入文字，失去焦点，输入完成后，标题栏的按钮再怎么点击都没反应了。

    解决中。。。

package com.test;

import android.app.TabActivity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Window;
import android.widget.TabHost;

public class CustomTitleInTabActivity extends TabActivity {
	public static CustomTitleInTabActivity mTabActivityInstance;

	/** Called when the activity is first created. */
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		requestWindowFeature(Window.FEATURE_CUSTOM_TITLE);
		setContentView(R.layout.main);

		TabHost tabHost = getTabHost(); // The activity TabHost
		TabHost.TabSpec spec; // Reusable TabSpec for each tab
		Intent tabIntent; // Reusable Intent for each tab

		mTabActivityInstance = this;

		// Create an Intent to launch an Activity for the tab (to be reused)
		tabIntent = new Intent().setClass(this, TabA.class);

		// Initialize a TabSpec for each tab and add it to the TabHost
		spec = tabHost.newTabSpec("pickrideTab").setIndicator("搭x车")
				.setContent(tabIntent);
		tabHost.addTab(spec);

		// Create an Intent to launch an Activity for the tab (to be reused)
		tabIntent = new Intent().setClass(this, TabB.class);

		// Initialize a TabSpec for each tab and add it to the TabHost
		spec = tabHost.newTabSpec("pickrideTab").setIndicator("搭3车")
				.setContent(tabIntent);
		tabHost.addTab(spec);

		tabHost.setCurrentTab(0);
	}

}

package com.test;

import android.app.Activity;
import android.os.Bundle;
import android.view.Window;

public class TabA extends Activity {
	/** Called when the activity is first created. */
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		// requestWindowFeature(Window.FEATURE_CUSTOM_TITLE);
		setContentView(R.layout.titilebar_talklist);

	}

	@Override
	protected void onResume() {
		super.onResume();
		CustomTitleInTabActivity.mTabActivityInstance.getWindow()
				.setFeatureInt(Window.FEATURE_CUSTOM_TITLE,
						R.layout.titilebar_talklist);
	}

}

package com.test;

import android.app.Activity;
import android.os.Bundle;
import android.view.Window;

public class TabB extends Activity {
	/** Called when the activity is first created. */
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		// requestWindowFeature(Window.FEATURE_CUSTOM_TITLE);
		setContentView(R.layout.titilebar_talklist);

	}

	@Override
	protected void onResume() {
		super.onResume();
		CustomTitleInTabActivity.mTabActivityInstance.getWindow()
				.setFeatureInt(Window.FEATURE_CUSTOM_TITLE,
						R.layout.titilebar_talklist2);
	}
}