Android中ListView分类

1. 引言

在Android开发过程中往往有这样的需求，将ListView中的内容按年，月，日进行分类显示，要实现这样的效果我们可能有很多种方法，

如：多ListView拼合，自定义ListView组件等，下面介绍一种比较简单，而且实现结构清晰的实现方式，效果图及实现如下。

2. 效果图

ListView分类

3. 功能实现

(1) 主布局(main.xml)实现：

[java] view plain copy

<?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 = "@+id/categoryList"
android:layout_width = "fill_parent"
android:layout_height = "fill_parent"
/>
</LinearLayout>

(2) 主Activity实现：

[java] view plain copy

package com.flora;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.TextView;
public class ListViewCategoryActivity extends Activity {
private String [] mContacts = {"马英才", "张三", "李四"};
private String [] mMusic = {"素顔", "庐州月", "半城烟沙"};
private String [] mEBook = {"拆掉思维里的墙", "淡定力", "人脉决定命脉"};
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mCategoryAdapter.addCategory("人名", new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, mContacts));
mCategoryAdapter.addCategory("音乐",new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, mMusic));
mCategoryAdapter.addCategory("书籍",new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, mEBook));
ListView categoryList = (ListView) findViewById(R.id.categoryList);
categoryList.setAdapter(mCategoryAdapter);
}
private CategoryAdapter mCategoryAdapter = new CategoryAdapter() {
@Override
protected View getTitleView(String title, int index, View convertView, ViewGroup parent) {
TextView titleView;
if (convertView == null) {
titleView = (TextView)getLayoutInflater().inflate(R.layout.title, null);
} else {
titleView = (TextView)convertView;
}
titleView.setText(title);
return titleView;
}
};
}

(3) Adapter实现：

[java] view plain copy

package com.flora;
import java.util.ArrayList;
import java.util.List;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Adapter;
import android.widget.BaseAdapter;
public abstract class CategoryAdapter extends BaseAdapter {
private List<Category> categories = new ArrayList<Category>();
public void addCategory(String title, Adapter adapter) {
categories.add(new Category(title, adapter));
}
@Override
public int getCount() {
int total = 0;
for (Category category : categories) {
total += category.getAdapter().getCount() + 1;
}
return total;
}
@Override
public Object getItem(int position) {
for (Category category : categories) {
if (position == 0) {
return category;
}
int size = category.getAdapter().getCount() + 1;
if (position < size) {
return category.getAdapter().getItem(position-1);
}
position -= size;
}
return null;
}
@Override
public long getItemId(int position) {
return position;
}
public int getViewTypeCount() {
int total = 1;
for (Category category : categories) {
total += category.getAdapter().getViewTypeCount();
}
return total;
}
public int getItemViewType(int position) {
int typeOffset = 1;
for (Category category : categories) {
if (position == 0) {
return 0;
}
int size = category.getAdapter().getCount() + 1;
if (position < size) {
return typeOffset + category.getAdapter().getItemViewType(position - 1);
}
position -= size;
typeOffset += category.getAdapter().getViewTypeCount();
}
return -1;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
int categoryIndex = 0;
for (Category category : categories) {
if (position == 0) {
return getTitleView(category.getTitle(), categoryIndex,convertView, parent);
}
int size = category.getAdapter().getCount()+1;
if (position < size) {
return category.getAdapter().getView(position - 1, convertView, parent);
}
position -= size;
categoryIndex++;
}
return null;
}
protected abstract View getTitleView(String caption,int index,View convertView,ViewGroup parent);
}