android - ArrayAdapter 要求 ID 为 TextView 错误

Question

我正在尝试为我的列表项创建一个漂亮的布局，但我的代码只有在像这样简化时才有效:

<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:padding="10dp"
    android:textSize="16sp" >
</TextView>

当我再添加一点时，它会编译并运行，但它会在启动时强制关闭并给我错误信息ArrayAdapter requires ID to be a TextView:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="?android:attr/listPreferredItemHeight"
    android:padding="6dip" >

    <ImageView
        android:id="@+id/icon1"
        android:layout_width="wrap_content"
        android:layout_height="fill_parent"
        android:layout_alignParentBottom="true"
        android:layout_alignParentTop="true"
        android:layout_marginRight="6dip"
        android:src="@drawable/ic_launcher" />

    <TextView
        android:id="@+id/secondLine"
        android:layout_width="fill_parent"
        android:layout_height="26dip"
        android:layout_alignParentBottom="true"
        android:layout_alignParentRight="true"
        android:layout_toRightOf="@id/icon1"
        android:ellipsize="marquee"
        android:singleLine="true"
        android:text="Some more information" />

    <TextView
        android:id="@+id/textView1"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_above="@id/secondLine"
        android:layout_alignParentTop="true"
        android:layout_alignWithParentIfMissing="true"
        android:layout_toRightOf="@id/icon1"
        android:gravity="center_vertical"
        android:text="Some Information" />

    <ImageView
        android:id="@+id/icon2"
        android:layout_width="wrap_content"
        android:layout_height="fill_parent"
        android:layout_alignParentRight="true"
        android:layout_alignParentTop="true"
        android:layout_marginRight="6dip"
        android:src="@drawable/ic_launcher" />

</RelativeLayout>

和

public class FirstLoginActivity extends ListActivity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        String[] testcontacts = getResources().getStringArray(
                R.array.testcontacts_array);
        setListAdapter(new ArrayAdapter<String>(this, R.layout.list_items,
                testcontacts));

        ListView lv = getListView();
        lv.setTextFilterEnabled(true);

        lv.setOnItemClickListener(new OnItemClickListener() {
            public void onItemClick(AdapterView<?> parent, View view,
                    int position, long id) {
                // When clicked, show a toast with the TextView text
                Toast.makeText(getApplicationContext(),
                        ((TextView) view).getText(), Toast.LENGTH_SHORT).show();
            }
        });
    }

我很确定我做的是对的，我已经学习了很多教程并且我发现最快和最有效的方法是创建一个静态 ViewHolder 类。其中一个教程尝试直接访问数据，这正是我想要做的。我仍然对如何这样做感到困惑。

    public class FirstLoginActivity extends ListActivity {
    Context mContext;
    List mList;

    String[] testcontacts = getResources().getStringArray(
            R.array.testcontacts_array);

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setListAdapter(new ArrayAdapter<String>(this, R.layout.list_items,
                testcontacts));

        ListView lv = getListView();
        lv.setTextFilterEnabled(true);

        lv.setOnItemClickListener(new OnItemClickListener() {
            public void onItemClick(AdapterView<?> parent, View view,
                    int position, long id) {
                // When clicked, show a toast with the TextView text
                Toast.makeText(getApplicationContext(),
                        ((TextView) view).getText(), Toast.LENGTH_SHORT).show();
            }
        });
    }



    public View getView(int position, View convertview, ViewGroup parent) {
        ViewHolder holder;
        View v = convertview;
        if (v == null) {
            LayoutInflater inflater = (LayoutInflater) LayoutInflater
                    .from(mContext);
            v = inflater.inflate(R.layout.list_items, null);
            holder = new ViewHolder();
            holder.firstLine = (TextView) v.findViewById(R.id.firstLine);
            holder.secondLine = (TextView) v.findViewById(R.id.secondLine);
            holder.icon1 = (ImageView) v.findViewById(R.id.icon1);
            holder.icon2 = (ImageView) v.findViewById(R.id.icon2);
            v.setTag(holder);
        } else {
            holder = (ViewHolder) v.getTag();
        }
        holder.firstLine.setText(testcontacts[position]);
        holder.secondLine.setText(testcontacts[position]);
        // holder.icon1.setImageBitmap((position & 1) == 1 ? mIcon1: mIcon2);
        //call the images directly?
        return v;
    }

    static class ViewHolder {
        TextView firstLine;
        TextView secondLine;
        ImageView icon1;
        ImageView icon2;

    }
}

Answer 1

你可能正在使用这样的东西(here the doc):

ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, R.layout.layout_1, values);

在这种情况下，您的布局必须是带有 TextView 的简单布局。

如果您想使用自己的布局，则需要编写自定义适配器。