关于Fragment实现tab标签效果的提示_fragment设置提示-优快云博客

本文介绍了一种在Android应用中使用Fragment进行页面切换的方法，通过在MainActivity中设置FragmentTransaction并调用replace方法来实现不同Fragment的显示。重点在于如何通过RadioGroup的OnCheckedChangeListener动态改变显示的Fragment。

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http://blog.youkuaiyun.com/zjlovety/article/details/21519205
在这篇文章中有这样的代码

public class MainActivity extends Activity {  
    private FragmentManager fragmentManager;  
    private RadioGroup radioGroup;  

    @TargetApi(Build.VERSION_CODES.HONEYCOMB)  
    @Override  
    protected void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        requestWindowFeature(Window.FEATURE_NO_TITLE);  
        setContentView(R.layout.weibo_tab);  

        fragmentManager = getFragmentManager();  
        radioGroup = (RadioGroup) findViewById(R.id.rg_tab);  
        radioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {  
            @Override  
            public void onCheckedChanged(RadioGroup group, int checkedId) {  
                FragmentTransaction transaction = fragmentManager.beginTransaction();  
                Fragment fragment = FragmentFactory.getInstanceByIndex(checkedId);  
                transaction.replace(R.id.content, fragment);  
                transaction.commit();  
            }  
        });  
    }  

}  ```

其中有这么一行

           transaction.replace(R.id.content,fragment);


R.id.content是该activity布局文件weibo_tab.xml中的framelayout的Id