Android ListView标头

Android ListView标头

下面是我如何做到这一点，键

getItemViewType

和

getViewTypeCount

的

Adapter

类。

getViewTypeCount

返回列表中有多少种项目，在这种情况下，我们有一个标题项和一个事件项，所以两个。

getItemViewType

应该返回

View

输入处的类型

position

。

那么Android将带你传递正确类型的护理

View

中

convertView

自动。

首先，我们有一个接口，我们的两个列表项类型将实现

public interface Item {    public int getViewType();    public View getView(LayoutInflater inflater, View convertView);}

然后，我们有一个适配器，其中包含 Item

public class TwoTextArrayAdapter extends ArrayAdapter<Item> {    private LayoutInflater mInflater;    public enum RowType {        LIST_ITEM, HEADER_ITEM    }    public TwoTextArrayAdapter(Context context, List<Item> items) {        super(context, 0, items);        mInflater = LayoutInflater.from(context);    }    @Override    public int getViewTypeCount() {        return RowType.values().length;    }    @Override    public int getItemViewType(int position) {        return getItem(position).getViewType();    }@Overridepublic View getView(int position, View convertView, ViewGroup parent) {   return getItem(position).getView(mInflater, convertView);}

编辑 更好地为性能..可以滚动时注意到

private static final int TYPE_ITEM = 0; private static final int TYPE_SEPARATOR = 1; public View getView(int position, View convertView, ViewGroup parent)  {    ViewHolder holder = null;    int rowType = getItemViewType(position);    View View;    if (convertView == null) {        holder = new ViewHolder();        switch (rowType) { case TYPE_ITEM:     convertView = mInflater.inflate(R.layout.task_details_row, null);     holder.View=getItem(position).getView(mInflater, convertView);     break; case TYPE_SEPARATOR:     convertView = mInflater.inflate(R.layout.task_detail_header, null);     holder.View=getItem(position).getView(mInflater, convertView);     break;        }        convertView.setTag(holder);    }    else    {        holder = (ViewHolder) convertView.getTag();    }    return convertView; } public static class ViewHolder {    public  View View; } }

然后，我们对工具进行分类，Item并为正确的布局充气。在你的情况下，你将拥有一个Header类和一个ListItem类。

   public class Header implements Item {    private final String         name;    public Header(String name) {        this.name = name;    }    @Override    public int getViewType() {        return RowType.HEADER_ITEM.ordinal();    }    @Override    public View getView(LayoutInflater inflater, View convertView) {        View view;        if (convertView == null) { view = (View) inflater.inflate(R.layout.header, null); // Do some initialization        } else { view = convertView;        }        TextView text = (TextView) view.findViewById(R.id.separator);        text.setText(name);        return view;    }}

然后ListItem上课

    public class ListItem implements Item {    private final String         str1;    private final String         str2;    public ListItem(String text1, String text2) {        this.str1 = text1;        this.str2 = text2;    }    @Override    public int getViewType() {        return RowType.LIST_ITEM.ordinal();    }    @Override    public View getView(LayoutInflater inflater, View convertView) {        View view;        if (convertView == null) { view = (View) inflater.inflate(R.layout.my_list_item, null); // Do some initialization        } else { view = convertView;        }        TextView text1 = (TextView) view.findViewById(R.id.list_content1);        TextView text2 = (TextView) view.findViewById(R.id.list_content2);        text1.setText(str1);        text2.setText(str2);        return view;    }}

和一个简单Activity的显示它

public class MainActivity extends ListActivity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        List<Item> items = new ArrayList<Item>();        items.add(new Header("Header 1"));        items.add(new ListItem("Text 1", "Rabble rabble"));        items.add(new ListItem("Text 2", "Rabble rabble"));        items.add(new ListItem("Text 3", "Rabble rabble"));        items.add(new ListItem("Text 4", "Rabble rabble"));        items.add(new Header("Header 2"));        items.add(new ListItem("Text 5", "Rabble rabble"));        items.add(new ListItem("Text 6", "Rabble rabble"));        items.add(new ListItem("Text 7", "Rabble rabble"));        items.add(new ListItem("Text 8", "Rabble rabble"));        TwoTextArrayAdapter adapter = new TwoTextArrayAdapter(this, items);        setListAdapter(adapter);    }}

布局

R.layout.header

<?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="horizontal" >    <TextView                android:id="@+id/separator"        android:text="Header"        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:background="#757678"        android:textColor="#f5c227" /></LinearLayout>

布局

R.layout.my_list_item

<?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="horizontal" >    <TextView        android:id="@+id/list_content1"        android:layout_width="wrap_content"        android:layout_height="match_parent"        android:layout_margin="5dip"        android:clickable="false"        android:gravity="center"        android:longClickable="false"        android:paddingBottom="1dip"        android:paddingTop="1dip"        android:text="sample"        android:textColor="#ff7f1d"        android:textSize="17dip"        android:textStyle="bold" />    <TextView        android:id="@+id/list_content2"        android:layout_width="wrap_content"        android:layout_height="match_parent"        android:layout_margin="5dip"        android:clickable="false"        android:gravity="center"        android:linksClickable="false"        android:longClickable="false"        android:paddingBottom="1dip"        android:paddingTop="1dip"        android:text="sample"        android:textColor="#6d6d6d"        android:textSize="17dip" /></LinearLayout>

布局

R.layout.activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    tools:context=".MainActivity" >    <ListView        android:id="@android:id/list"        android:layout_width="fill_parent"        android:layout_height="fill_parent" /></RelativeLayout>

你也可以变得更

ViewHolders

喜欢并使用，异步加载内容或任何你喜欢的内容。