Android中ListView分类

Android中ListView分类

分类： Android基础 2011-04-27 17:17 1209人阅读 评论(31) 收藏 举报

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

   

3. 功能实现

 

    (1) 主布局(main.xml)实现：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android = "http://schemas./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：

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：

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);

}

 

    (4) 分类ValueBean实现：

package com.flora;
import android.widget.Adapter;
public class Category {
    private String mTitle;

    private Adapter mAdapter;
    public Category(String title, Adapter adapter) {
        mTitle = title;
        mAdapter = adapter;
    }

    public void setTile(String title) {
        mTitle = title;
    }

    public String getTitle() {
        return mTitle;
    }

    public void setAdapter(Adapter adapter) {
        mAdapter = adapter;
    }

    public Adapter getAdapter() {
        return mAdapter;
    }

}

 

    (5) 分类Title实现：

<?xml version="1.0" encoding="utf-8"?>
<TextView
    xmlns:android = "http://schemas./apk/res/android"
    android:layout_width = "match_parent"
    android:layout_height = "match_parent"
    android:minHeight = "30dip"
    android:gravity = "center_vertical"
    android:paddingLeft = "10dip"
    android:background = "@color/title_background_color"
    />

 

--------------------滑动时变黑的问题----------------------------

老问题，Google一下就能找到N多答案，为方便自己日后查阅，记录如下：

 

手指在ListView上下滚动时，ListViewItem背景变黑，因为在滚动的时候为了提升性能做了优化，为提高滚动的性能，Android框架在ListView中引入CacheColorHint属性。如果该值为非0，则说明该ListView绘制在单色不透明的背景上，在默认情况下该值为#191919，也就是黑色主题中的黑色背景颜色值，这样当ListView滚动的时候就会使用该值来绘制ListView的背景。

 

两种解决办法：

1、xml中，ListView内新增如下属性：

 

Xml代码 Xml代码   

android:cacheColorHint="#00000000"

 

2、Java类文件中，对ListView设置如下属性：

listview.setCacheColorHint(Color.TRANSPARENT);

 

OK，完美解决呵呵 

android:cacheColorHint="#00000000"