Android ListFragment 错误

Question

这是我第一次使用 ListFragments，我遇到了一个错误。 所以我的问题是为什么我在这行代码上得到了一条红线？

setListAdapter(new ArrayAdapter<String>(getActivity(),
            android.R.layout.simple_list_item_1, model.getIncidents()));

上面写着The constructor ArrayAdapter<String>(Activity, int, ArrayList<Incident>) is undefined

编辑

我不再收到此片段的上述错误。我稍微修改了代码，现在看起来像这样：

public class Incidents_Frag extends ListFragment {
View view;
public static Model model;

public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {        
    view = inflater.inflate(R.layout.incid, container, false);
    model = new Model();
    setListAdapter(new ArrayAdapter<Incident>(getActivity(),
            android.R.layout.simple_list_item_1, model.getIncidents()));        
    return view;
}
}

但是现在我得到一个运行时错误。 logcat 在下面

04-21 18:47:40.934: E/AndroidRuntime(806): FATAL EXCEPTION: main
04-21 18:47:40.934: E/AndroidRuntime(806): java.lang.RuntimeException: Content has view with id attribute 'android.R.id.list' that is not a ListView class
04-21 18:47:40.934: E/AndroidRuntime(806):  at android.app.ListFragment.ensureList(ListFragment.java:402)
04-21 18:47:40.934: E/AndroidRuntime(806):  at android.app.ListFragment.onViewCreated(ListFragment.java:203)
04-21 18:47:40.934: E/AndroidRuntime(806):  at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:809)
04-21 18:47:40.934: E/AndroidRuntime(806):  at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:998)
04-21 18:47:40.934: E/AndroidRuntime(806):  at android.app.BackStackRecord.run(BackStackRecord.java:622)
04-21 18:47:40.934: E/AndroidRuntime(806):  at android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1330)
04-21 18:47:40.934: E/AndroidRuntime(806):  at android.app.FragmentManagerImpl$1.run(FragmentManager.java:417)
04-21 18:47:40.934: E/AndroidRuntime(806):  at android.os.Handler.handleCallback(Handler.java:605)
04-21 18:47:40.934: E/AndroidRuntime(806):  at android.os.Handler.dispatchMessage(Handler.java:92)
04-21 18:47:40.934: E/AndroidRuntime(806):  at android.os.Looper.loop(Looper.java:137)
04-21 18:47:40.934: E/AndroidRuntime(806):  at android.app.ActivityThread.main(ActivityThread.java:4340)
04-21 18:47:40.934: E/AndroidRuntime(806):  at java.lang.reflect.Method.invokeNative(Native Method)
04-21 18:47:40.934: E/AndroidRuntime(806):  at java.lang.reflect.Method.invoke(Method.java:511)
04-21 18:47:40.934: E/AndroidRuntime(806):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
04-21 18:47:40.934: E/AndroidRuntime(806):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
04-21 18:47:40.934: E/AndroidRuntime(806):  at dalvik.system.NativeStart.main(Native Method)

我终其一生都无法弄清楚他们在第一行所说的内容。我没有看到任何名为 list 的 R.id 文件。我现在相信我只需要在某个地方放置一个列表视图或文本视图。 感谢您提供的任何帮助

编辑

这是我的片段的新代码

public class Incidents_Frag extends ListFragment {
View view;
public static Model model;

public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {        
    view = inflater.inflate(R.layout.incid, container, false);
    model = new Model();
    setListAdapter(new ArrayAdapter<Incident>(getActivity(),
            android.R.layout.simple_list_item_1, model.getIncidents()));        
    return view;
}

public class MyArrayAdapter extends ArrayAdapter<Item> {
    ArrayList<Incident> items;
    Context context;
    public MyArrayAdapter(Context context, int textViewResourceId,
            ArrayList<Incident> items) {
        super(context, textViewResourceId, items);

        this.context = context;
        this.items = items; 
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent)
    {
        View row = convertView;
        ViewHolder holder = new ViewHolder();
        Item item = items.get(position);

        if(row == null)
        {
            LayoutInflater inflater = ((Activity)context).getLayoutInflater();
            row = inflater.inflate(R.layout.list_item, parent, false);
            holder.userName = (TextView) row.findViewById(R.id.name);
            row.setTag(holder);
        }
        else
        { 
            holder = (ViewHolder) row.getTag();
        }

        holder.name.setText(item.getName());
        return row;
    }

    public static class ViewHolder
    {
        TextView name;
    }

    public int getCount() {
        return items.size();
    }

}
}

下面有红线 Item item = items.get(position);

holder.userName = (TextView) row.findViewById(R.id.name);
“无法解析用户名”

holder.name.setText(item.getName());
"对于 ClipData.Item 类型的方法 getName() 未定义"

public static class ViewHolder
"成员类型 ViewHolder 不能声明为静态；静态类型只能声明为静态或顶级类型"

因此，如果我们能够清除这些红线，它可能会奏效，也可能不会奏效。如果您希望我继续走这条路，请告知此代码是否在正确的位置，以及需要进行哪些编辑

Answer 1

默认构造函数只接受一个字符串数组。您可以传递一个“事件”数组，从而导致该错误。

您必须实现自己的 ArrayAdapter，它接受对象类型“事件”的数组。

扩展的 ArrayAdapter 示例如下所示。

public class MyArrayAdapter extends ArrayAdapter<Incident> { // changed from Item to Incident
    ArrayList<Incident> items;
    Context context;
    public MyArrayAdapter(Context context, int textViewResourceId,
            ArrayList<Incident> items) {
        super(context, textViewResourceId, items);

        this.context = context;
        this.items = items; 
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent)
    {
        View row = convertView;
        ViewHolder holder = new ViewHolder();
        Incident item = items.get(position); // item is your accident

        if(row == null)
        {
            LayoutInflater inflater = ((Activity)context).getLayoutInflater();
            row = inflater.inflate(R.layout.list_item, parent, false);
            holder.name = (TextView) row.findViewById(R.id.name); // updated it is name from holder class
            row.setTag(holder);
        }
        else
        {
            holder = (ViewHolder) row.getTag();
        }

        holder.name.setText(item.getName()); // this is just example item is your Incident, you have to get it's name function whatever that is in your class
        return row;
    }

    public static class ViewHolder
    {
        TextView name;
    }

    public int getCount() {
        return items.size();
    }

}

您必须为此创建自己的布局。对于上面的例子，创建 list_item.xml 并添加一个带有 id 名称的 TextView 就可以了。