其中日期标题部分视图布局:
view sourceprint?1 <?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=”10dip” android:background=”@drawable/section_background”> <TextView android:id=”@+id/section_title” android:layout_width=”fill_parent” android:layout_height=”match_parent” /> </LinearLayout>
带图片的条目布局部分:
<?xml version=”1.0″ encoding=”utf-8″?> <LinearLayout xmlns:android=”http://schemas.android.com/apk/res/android” android:layout_width=”fill_parent” android:layout_height=”wrap_content” android:orientation=”horizontal” > <ImageView android:id=”@+id/image” android:src=”@drawable/p” android:layout_width=”wrap_content” android:layout_height=”wrap_content” /> <TextView android:id=”@+id/title” android:layout_width=”wrap_content” android:layout_height=”wrap_content” /> </LinearLayout>
问题在于,如何在ListView中既有标题条目又有内容条目。
这里用到了设计模式中的Iterator模式。在java代码中示例有Iterator,可以迭代ArrayList,HashSet等不同的数据结构对象。
ListElement是接口:
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package com.easymorse.listview.customer; import android.content.Context; import android.view.LayoutInflater; import android.view.View; public interface ListElement { public int getLayoutId(); public boolean isClickable(); public View getViewForListElement(LayoutInflater layoutInflater, Context context, View view); }
其中:
- getLayoutId()返回布局的值;
- isClickable()返回是否可点击;
- getViewForListElement()返回视图对象。
这个接口有两个实现:
- SectionListElement,用于实现标题条目;
- ContentListElement,用于实现内容条目。
见SectionListElement代码:
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package com.easymorse.listview.customer; import android.content.Context; import android.view.LayoutInflater; import android.view.View; import android.widget.LinearLayout; import android.widget.TextView; public class SectionListElement implements ListElement { private String text; public void setText(String text) { this.text = text; } @Override public int getLayoutId() { return R.layout.section; } @Override public boolean isClickable() { return false; } @Override public View getViewForListElement(LayoutInflater layoutInflater, Context context, View view) { LinearLayout layout = (LinearLayout) layoutInflater.inflate(getLayoutId(), null); TextView textView=(TextView) layout.findViewById(R.id.section_title); textView.setText(text); return layout; } }
见ContentListElement代码:
ListView需要ListAdapter的实现。在这里是直接集成BaseAdapter来实现的。用于交给ListView生成出列表。代码:
public class CustomerListAdapter extends BaseAdapter { private Context context; protected ArrayList<ListElement> resultList; private LayoutInflater layoutInflater; public CustomerListAdapter(Context context) { super(); this.context = context; this.layoutInflater = (LayoutInflater) context .getSystemService(“layout_inflater”); this.resultList = new ArrayList<ListElement>(); } @Override public int getCount() { return this.resultList.size(); } @Override public Object getItem(int position) { return this.resultList.get(position); } @Override public long getItemId(int position) { return position; } @Override public View getView(int position, View view, ViewGroup parent) { return this.resultList.get(position).getViewForListElement( layoutInflater, context, view); } public void addList(List<ListElement> elements) { this.resultList.addAll(elements); } @Override public boolean isEnabled(int position) { return this.resultList.get(position).isClickable(); } public void addSectionHeaderItem(String text) { SectionListElement element = new SectionListElement(); element.setText(text); this.resultList.add(element); } }
在Activity中创建CustomerListAdapter以及设置它的代码部分:
CustomerListAdapter adapter = new CustomerListAdapter(this); adapter.addSectionHeaderItem(“2002-3-1″); ArrayList<ListElement> elements = new ArrayList<ListElement>(); for (int i = 0; i < 5; i++) { ContentListElement element = new ContentListElement(); element.setTitle(“哈利波特第” + (i+1) + “集”); elements.add(element); } adapter.addList(elements); adapter.addSectionHeaderItem(“2002-2-2″); elements = new ArrayList<ListElement>(); for (int i = 0; i < 3; i++) { ContentListElement element = new ContentListElement(); element.setTitle(“指环王第” + (i+1) + “集”); elements.add(element); } adapter.addList(elements); this.setListAdapter(adapter);
这里ListActivity,还需要注意两件事情,Activity要继承ListActivity。另外,在layout中:
ListView的id要用系统自带的
Listview Section 多个标题以及内容
时间: 2024-11-10 16:19:38