如何在片段中设置文本？答案

【问题标题】：How to set text in a fragment?如何在片段中设置文本？
【发布时间】：2014-02-08 18:01:10
【问题描述】：

我正在尝试将我的应用程序转换为片段与活动，以便更好地遵循带有导航抽屉的 android 设计指南。

我有一个带有按钮的片段，按下该按钮时会执行此代码以启动一个新片段：

FragmentManager man=getFragmentManager();
        FragmentTransaction tran=man.beginTransaction();
        Fragment_one=new Fragment1();
        tran.add(R.id.main, Fragment_one);//tran.
        tran.addToBackStack(null);
        tran.commit();

它尝试加载的片段是这样的：

public class BPTopBeers extends Fragment {

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {

        SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(getActivity());
        String userName = prefs.getString("userName", null);
        String userID = prefs.getString("userID", null);

        String title = "Top Beers on Beer Portfolio";
        TextView topTitle = (TextView) findViewById(R.id.topTasteTitle);
        topTitle.setText(title);



        //construct url
        String url = "myURL";

        Log.d("myUrl", url);

        //async task goes here
        new GetYourTopTasteBeers(this).execute(url);

        // Inflate the layout for this fragment
        //todo: change to discover layout
        return inflater.inflate(R.layout.toptaste_layout, container, false);

    }



}

我在上述代码的这一行遇到错误：

TextView topTitle = (TextView) findViewById(R.id.topTasteTitle);

cannot resolve method findviewbyid 是错误

【问题讨论】：

标签： android android-fragments android-xml

【解决方案1】：

试试这个，你需要通过root view获取root view并使用findViewById。

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {

    View v = inflater.inflate(R.layout.toptaste_layout, container, false);

    // rest of the code
    TextView topTitle = (TextView) v.findViewById(R.id.topTasteTitle);

    return v;

}

【讨论】：

【解决方案2】：

将 onCreateView() 改成这个-

@Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) 
{
        View view = inflater.inflate(R.layout.toptaste_layout, container, false);
        SharedPreferences prefs =    PreferenceManager.getDefaultSharedPreferences(getActivity());
        String userName = prefs.getString("userName", null);
        String userID = prefs.getString("userID", null);

        String title = "Top Beers on Beer Portfolio";
        TextView topTitle = (TextView) view.findViewById(R.id.topTasteTitle);
        topTitle.setText(title);



        //construct url
        String url = "myURL";

        Log.d("myUrl", url);

        //async task goes here
        new GetYourTopTasteBeers(this).execute(url);

        // Inflate the layout for this fragment
        //todo: change to discover layout
        return view;

    }

【讨论】：

this 应该是getActivity()