tabhost内容未显示，跟xml有关

activity如下：

package com.mobileclient.activity;


import com.mobileclient.app.Declare;


import android.app.TabActivity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.RadioGroup;
import android.widget.RadioGroup.OnCheckedChangeListener;
import android.widget.TabHost;


public class TeachSourceDetailActivity extends TabActivity implements OnCheckedChangeListener{
private String courseNumber;
private TabHost tabHost;


private RadioGroup radioGroup;


public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// 设置标题
setTitle("手机客户端-课程信息详情");
setContentView(R.layout.source_detail_main);
Declare declare = (Declare) getApplicationContext();
String username = declare.getUserName();
if (username == null) {
setTitle("当前位置--课程信息列表");
} else {
setTitle("您好：" + username + " 当前位置---课程信息列表");
}
radioGroup=(RadioGroup)findViewById(R.id.radiogroup);
radioGroup.setOnCheckedChangeListener(this);
tabHost=(TabHost)findViewById(android.R.id.tabhost);
tabHost.setFocusable(true);
tabHost.setCurrentTab(0);
tabHost = getTabHost();
tabHost.addTab(tabHost.newTabSpec("introduce")
.setIndicator("Introduce")
.setContent(new Intent(this,IntroduceActivity.class)));
tabHost.addTab(tabHost.newTabSpec("chapter").
setIndicator("Chapter").
setContent(new Intent(this,ChapterActivity.class)));
tabHost.addTab(tabHost.newTabSpec("notes").
setIndicator("Notes").
setContent(new Intent(this,NotesActivity.class)));


}
@Override
public void onCheckedChanged(RadioGroup group,int checkedId) {
// TODO Auto-generated method stub
switch (checkedId) {
case R.id.radio_introduce:
this.tabHost.setCurrentTabByTag("introduce");
break;
case R.id.radio_chapter:
this.tabHost.setCurrentTabByTag("chapter");
break;
case R.id.radio_notes:
this.tabHost.setCurrentTabByTag("notes");
break;

}
}


}

tabhost界面：

<?xml version="1.0" encoding="utf-8"?>

（编辑：李大同）

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