Android adapter设计模式一 静态设值

1、创建实体类：

/** * @描述 TODO * @项目名称 App_imooc * @包名 com.android.imooc.quickIndex * @类名 Person * @author chenlin * @date 2015年5月24日 下午10:09:25 * @version 1.0 */public class Person implements Comparable<Person>{    private String name;    private String pinyin;    public Person(String name){        this.name = name;        this.pinyin = PinyinUtils.getPinyin(name);    }    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    public String getPinyin() {        return pinyin;    }    public void setPinyin(String pinyin) {        this.pinyin = pinyin;    }    @Override    public int compareTo(Person another) {        return this.pinyin.compareTo(another.pinyin);    }}

2.创建适配器

/** *  * @描述         TODO * @项目名称      App_imooc * @包名         com.android.imooc.quickIndex * @类名         PersonAdapter * @author      chenlin * @date        2015年5月24日 下午10:37:07 * @version     1.0 */public class PersonAdapter extends BaseAdapter {    private Context mContext;    private ArrayList<Person> mDatas;    public PersonAdapter(Context mContext, ArrayList<Person> datas) {        this.mContext = mContext;        this.mDatas = datas;    }    @Override    public int getCount() {        return mDatas.size();    }    @Override    public Object getItem(int position) {        return mDatas.get(position);    }    @Override    public long getItemId(int position) {        return position;    }    @Override    public View getView(int position, View convertView, ViewGroup parent) {        View view = convertView;        if(convertView == null){            view = view.inflate(mContext, R.layout.item_quickindex, null);        }        ViewHolder mViewHolder = ViewHolder.getHolder(view);        Person p = mDatas.get(position);        String str = null;        String currentLetter = p.getPinyin().charAt(0) + "";        // 根据上一个首字母,决定当前是否显示字母        if(position == 0){            str = currentLetter;        }else {            // 上一个人的拼音的首字母            String preLetter = mDatas.get(position - 1).getPinyin().charAt(0) + "";            if(!TextUtils.equals(preLetter, currentLetter)){                str = currentLetter;            }        }        // 根据str是否为空,决定是否显示索引栏        mViewHolder.mIndex.setVisibility(str == null ? View.GONE : View.VISIBLE);        mViewHolder.mIndex.setText(currentLetter);        mViewHolder.mName.setText(p.getName());        return view;    }    static class ViewHolder {        TextView mIndex;        TextView mName;        public static ViewHolder getHolder(View view) {            Object tag = view.getTag();            if(tag != null){                return (ViewHolder)tag;            }else {                ViewHolder viewHolder = new ViewHolder();                viewHolder.mIndex = (TextView) view.findViewById(R.id.tv_index);                viewHolder.mName = (TextView) view.findViewById(R.id.tv_name);                view.setTag(viewHolder);                return viewHolder;            }        }    }}

3.相关布局：

<?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="vertical" >    <TextView        android:id="@+id/tv_index"        android:layout_width="match_parent"        android:layout_height="40dp"        android:background="#888888"        android:gravity="center_vertical"        android:paddingLeft="20dp"        android:text="A"        android:textColor="#ffffff"        android:textSize="20sp" />    <TextView        android:id="@+id/tv_name"        android:layout_width="match_parent"        android:layout_height="50dp"        android:gravity="center_vertical"        android:paddingLeft="20dp"        android:text="宋江"        android:textSize="24sp" /></LinearLayout>