android - 使用自定义适配器获取 ListView 的高度

Question

我在 scrollView 中有 listView(是的，我知道那是不好的方法。最好使用页眉/页脚)。我知道 scrollView 和 listView 都有滚动，这会导致一些冲突。在这种情况下，我需要手动设置列表的高度。这就是问题所在，因为 listView 具有自定义适配器。

布局:

<?xml version="1.0" encoding="utf-8"?>

<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/ScrollView01"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fillViewport="true"
android:scrollbars="none" >
<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools"
        android:id="@+id/fragment_lessons"
        android:background="#FAF9F9"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        tools:context="com.cbsystematic.mobile.itvdn.LessonsFragment">

        <TextView
            android:id="@+id/course_title"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:text="Описание курса: "
            android:textSize="16sp"
            android:textStyle="bold"
            android:textColor="#000000"/>

        <TextView
            android:id="@+id/course_description"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:textSize="16sp"
            android:layout_below="@id/course_title"
            android:textColor="#000000"/>

        <TextView
            android:id="@+id/course_duration"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:textSize="14sp"
            android:textStyle="italic"
            android:layout_below="@id/course_description"
            android:textColor="#000000"/>

        <ListView android:id="@android:id/list"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_below="@id/course_duration"/>
        </RelativeLayout>
    </LinearLayout>
</ScrollView>

自定义列表适配器:

class LessonsItemAdapter extends ArrayAdapter<LessonData> {
private Activity myContext;
private ArrayList<LessonData> datas;

public LessonsItemAdapter(Context context, int textViewResourceId, ArrayList<LessonData> objects){
    super(context, textViewResourceId, objects);

    myContext = (Activity) context;
    datas = objects;
}

public View getView(int position, View convertView, ViewGroup parent){
    ViewHolder viewHolder;

    if(convertView == null) {
        LayoutInflater inflater = myContext.getLayoutInflater();
        convertView = inflater.inflate(R.layout.lessons_list_item, null);

        viewHolder = new ViewHolder();
        viewHolder.postNameView = (TextView) convertView.findViewById(R.id.lessons_name);
        viewHolder.postDurationView = (TextView) convertView.findViewById(R.id.lessons_duration);

        convertView.setTag(viewHolder);
    } else {
        viewHolder = (ViewHolder) convertView.getTag();
    }

    //(position + 1) + ") " used to display 1) 2) 3) etc of lessons
    viewHolder.postNameView.setText((position + 1) + ") " + datas.get(position).getName());
    viewHolder.postDurationView.setText("Длительность: " + datas.get(position).getDuration().substring(0,8));

    return convertView;
}

static class ViewHolder{
    TextView postNameView;
    TextView postDurationView;
}
}

求高的方法:

    public static void setListViewSize(AbsListView listView) {
    ListAdapter listAdapter = listView.getAdapter();
    if (listAdapter == null)
        return;

    int desiredWidth = MeasureSpec.makeMeasureSpec(listView.getWidth(), MeasureSpec.UNSPECIFIED);
    int totalHeight = 0;
    View view = null;
    for (int i = 0; i < listAdapter.getCount(); i++) {
        view = listAdapter.getView(i, view, listView);
        if (i == 0)
            view.setLayoutParams(new ViewGroup.LayoutParams(desiredWidth, AbsListView.LayoutParams.WRAP_CONTENT));

        view.measure(desiredWidth, MeasureSpec.UNSPECIFIED);
        totalHeight += view.getMeasuredHeight();
    }
    ViewGroup.LayoutParams params = listView.getLayoutParams();
    params.height = totalHeight + (listView.getMeasuredHeight() * (listAdapter.getCount() + 1));
    listView.setLayoutParams(params);
    listView.requestLayout();
}

这就是我设置列表内容的方式:

    mAdapter = new LessonsItemAdapter(getActivity(),
            R.layout.lessons_list_item, parserJson.getLessons(courseUrl).getLessonsArray());

    // Set the adapter
    mListView = (AbsListView) view.findViewById(android.R.id.list);
    ((AdapterView<ListAdapter>) mListView).setAdapter(mAdapter);

    // Set OnItemClickListener so we can be notified on item clicks
    mListView.setOnItemClickListener(this);
    ListHelper.setListViewSize(mListView);

这就是结果:

整个View都在滚动。但是最后一项总是只显示一半。你看，持续时间字段(“Длительность”)没有显示。尽管列表的最后一项是可点击的。

请帮助我定义总高度的方法。提前致谢。感谢任何帮助。

Answer 1

使用这段代码。它会根据项目的数量重置 ListView 的大小。

public static void setListViewHeightBasedOnChildren(ListView listView) {
    ListAdapter listAdapter = listView.getAdapter();
    if (listAdapter == null)
        return;

    int desiredWidth = MeasureSpec.makeMeasureSpec(listView.getWidth(),
            MeasureSpec.UNSPECIFIED);
    int totalHeight = 0;
    View view = null;
    for (int i = 0; i < listAdapter.getCount(); i++) {
        view = listAdapter.getView(i, view, listView);
        if (i == 0)
            view.setLayoutParams(new ViewGroup.LayoutParams(desiredWidth,
                    LayoutParams.WRAP_CONTENT));

        view.measure(desiredWidth, MeasureSpec.UNSPECIFIED);
        totalHeight += view.getMeasuredHeight();
    }
    ViewGroup.LayoutParams params = listView.getLayoutParams();
    params.height = totalHeight
            + (listView.getDividerHeight() * (listAdapter.getCount() - 1));
    listView.setLayoutParams(params);
    listView.requestLayout();
}