Question

我需要在Android中创建一个具有标题并且是多行的ListView。我用它来显示作业标题和它下面的截止日期。作业分为两个标题：“即将到来的作业”和“过去的作业”（当然，基于日期）。

我的标题正常工作，作业标题显示正确，但我对如何将第二行合并到列表中感到难过。

这是我的代码：

ListCourseAssignments.java

@Override
public void onCreate(Bundle savedInstanceState){
    super.onCreate(savedInstanceState);
    final SeparatedListAdapter adapter;
    setContentView(R.layout.courseassignmentslistview);
    adapter = new SeparatedListAdapter(getContext());
    ArrayAdapter<String> upcomingList = new ArrayAdapter<String>(getContext(), R.layout.list_item, Homework.getUpcomingDates()); // Homework.getUpcomingDates() Returns string array
    ArrayAdapter<String> pastList = new ArrayAdapter<String>(getContext(), R.layout.list_item, Homework.getPastDates()); // Homework.getPastDates() Returns string array

    adapter.addSection("Upcoming Assignments", upcomingList); 
    adapter.addSection("Past Assignments", pastList);

    ListView lv = (ListView) findViewById(android.R.id.list);
    lv.setAdapter(adapter);

    lv.setOnItemClickListener(new OnItemClickListener(){
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long duration){
            String item = (String) adapter.getItem(position);
            Toast.makeText(getApplicationContext(), item, Toast.LENGTH_SHORT).show();
        }
    });
}

SeparatedListAdapter.java

public class SeparatedListAdapter extends BaseAdapter {
public final Map<String, Adapter> sections = new LinkedHashMap<String, Adapter>();
public final ArrayAdapter<String> headers;

public SeparatedListAdapter(Context context) {
    headers = new ArrayAdapter<String>(context, R.layout.courseassignmentslistview_header);
}

public void addSection(String section, Adapter adapter) {
    this.headers.add(section);
    this.sections.put(section, adapter);
}

public Object getItem(int position) {
    for (Object section : this.sections.keySet()) {
        Adapter adapter = sections.get(section);
        int size = adapter.getCount() + 1;

        if (position == 0) return section;
        if (position < size) return adapter.getItem(position - 1);

        position -= size;
    }
    return null;
}

public int getCount() {
    int total = 0;
    for (Adapter adapter : this.sections.values()) total += adapter.getCount() + 1;
    return total;
}

@Override
public int getViewTypeCount() {
    int total = 1;
    for (Adapter adapter : this.sections.values()) total += adapter.getViewTypeCount();
    return total;
}

@Override
public int getItemViewType(int position) {
    int type = 1;
    for (Object section : this.sections.keySet()) {
        Adapter adapter = sections.get(section);
        int size = adapter.getCount() + 1;

        if (position == 0) return 0;
        if (position < size) return type + adapter.getItemViewType(position - 1);

        position -= size;
        type += adapter.getViewTypeCount();
    }
    return -1;
}

public boolean areAllItemsSelectable() {
    return false;
}

@Override
public boolean isEnabled(int position) {
    return (getItemViewType(position) != 0);
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    int sectionnum = 0;
    for (Object section : this.sections.keySet()) {
        Adapter adapter = sections.get(section);
        int size = adapter.getCount() + 1;

        if (position == 0) return headers.getView(sectionnum, convertView, parent);
        if (position < size) return adapter.getView(position - 1, convertView, parent);

        position -= size;
        sectionnum++;
    }
    return null;
}

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

courseassignmentslistview_header.xml

<TextView
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/list_header_title"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:paddingTop="2dip"
    android:paddingBottom="2dip"
    android:paddingLeft="5dip"
    style="?android:attr/listSeparatorTextViewStyle" />

courseassignmentslistview.xml

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

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

listitem.xml

<?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>

Here's a screenshot of what it currently looks like.

编辑：我知道如何创建一个包含多行的列表，但我只是不知道如何将它与带有标题的列表（例如这个）放在一起......

Answer 1

我不知道如何使用目前为止所做的事情，但你可以使用CommonWare的MergeAdapter来做。

引用自述文件：

MergeAdapter accepts a mix of Adapters and Views and presents them as one contiguous 
whole to whatever ListView it is poured into. This is good for cases where you have
multiple data sources, or if you have a handful of ordinary Views to mix in with lists 
of data, or the like.

你可以得到它here。

我写了一篇使用它的简要概述here

使用MergeAdapter，您可以通过为它们提供视图来使用它来创建节标题，然后将适配器设置为创建所需的双行格式。

带有标题的Android多行列表视图

1 个答案: