Question

我是Android开发的新手。我创建了一个列表视图，用于显示自定义格式的项目。我已经给出了我在eclipse中使用过的代码。但我在运行应用程序时收到错误，＆＃34;内容具有id属性＆＃39; android.R.id.list＆＃39;这不是ListFragment＆＃34;中的ListView类。

这是活动

import android.app.ListFragment;
import android.content.Context;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

public class CalllogActivity extends ListFragment implements AdapterView.OnItemClickListener{
    private CLAdapter adapter;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.fragment_list, container, false);

        return rootView;
    }

    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        //ArrayAdapter adapter = ArrayAdapter.createFromResource(getActivity(), R.array.CallLogs, R.layout.layout_calllogs);

        ListView lstDetails= (ListView) getView().findViewById(R.id.lstDtls);
        adapter=new CLAdapter(this);

        lstDetails.setAdapter(adapter);
        lstDetails.setOnItemClickListener(this);
    }

    @Override
    public void onItemClick(AdapterView<?> adapterView, View view, int i,
            long l) {
        Toast.makeText(getActivity(), "Item " + i, Toast.LENGTH_SHORT).show();
    }

    class CLAdapter extends BaseAdapter{
        private Context context;
        String[] CallLogNames;
        String[] CallNo;
        int[] images;
        String[] CallDateTime;

        public CLAdapter(Context context){
            this.context=context;
            CallLogNames = context.getResources().getStringArray(R.array.CallLogs);
        }

        public CLAdapter(CalllogActivity calllogActivity) {
            CallLogNames = context.getResources().getStringArray(R.array.CallLogs);
        }

        @Override
        public int getCount() {
            return CallLogNames.length;
        }

        @Override
        public Object getItem(int position) {
            return CallLogNames[position];
        }

        @Override
        public long getItemId(int position) {
            return position;
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            View row=null;
            if(convertView==null)
            {
                LayoutInflater inflater=(LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
                row = inflater.inflate(R.layout.layout_calllogs, parent, false);
            }
            else    
            {
                row=convertView;
            }

            TextView txtName=(TextView) row.findViewById(R.id.txtName);
            ImageView imgPhoto=(ImageView) row.findViewById(R.id.imgContact);
            TextView txtNo = (TextView) row.findViewById(R.id.txtNo);
            TextView txtDateTime = (TextView)row.findViewById(R.id.txtDateTime);

            txtName.setText(CallLogNames[position]);
            //txtNo.setText(CallLogNames[position]);
            //txtDateTime.setText(CallLogNames[position]);
            //imgPhoto.setImageResource(images[position]);
            return row;
        }
    }
}

这是片段XML代码

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <ListView
        android:id="@+id/lstDtls"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent" >
    </ListView>
</LinearLayout>

这是我在列表中显示的自定义布局

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <ImageView
        android:id="@+id/imgContact"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:adjustViewBounds="true"
        android:maxHeight="60dp"
        android:maxWidth="60dp"
        android:src="@drawable/unknown_contact" />

    <TextView
        android:id="@+id/txtName"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_marginLeft="12dp"
        android:layout_marginTop="10dp"
        android:layout_toRightOf="@+id/imgContact"
        android:text="Medium Text"
        android:textAppearance="?android:attr/textAppearanceMedium" />

    <TextView
        android:id="@+id/txtNo"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBottom="@+id/imgContact"
        android:layout_alignRight="@+id/txtName"
        android:layout_marginBottom="5dp"
        android:text="Medium Text"
        android:textAppearance="?android:attr/textAppearanceMedium" />

    <TextView
        android:id="@+id/txtDateTime"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBaseline="@+id/txtName"
        android:layout_alignBottom="@+id/txtName"
        android:layout_alignParentRight="true"
        android:layout_marginRight="18dp"
        android:text="Medium Text"
        android:textAppearance="?android:attr/textAppearanceMedium" />

</RelativeLayout>

Answer 1

尝试更改listView的ID

<ListView
        android:id="@+id/list"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent" >
    </ListView>

然后使用R.id.list 而不是 android.R.id.list

Answer 2

如果要在布局中使用ListFragment或ListActivity列表，必须使用预定义的id：

android:id="@android:id/list"

在您的代码中，您可以使用

检索此列表

ListView listview = (ListView)findViewById(android.R.id.list);

ListFragment和ListActivity对此值进行了硬编码，如果找不到要使用的列表，则无效。

Answer 3

要添加此功能，值得注意的是in the ListFragment spec它提到列表视图名为＆＃39; list＆＃39;必须有兄弟android.R.id.empty，或者不是空的。我的问题是列表视图都是空的，并没有empty兄弟。

修复是添加一个名为empty的文本视图，

<ListView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/list">
</ListView>

<TextView
    android:id="@android:id/empty"
    android:layout_width="match_parent"
    android:layout_height="wrap_content" >
</TextView>

＆＃39; android.R.id.list＆＃39;这不是ListFragment中的ListView类

3 个答案: