目标：自定义适配器Adapter实现点击每个item订阅按钮
上一篇介绍了listview的基本属性以及ArrayAdapter和SimpleAdapter的简单实用，链接：listview使用方式基础篇。
今天主要介绍一下自定义adapter，来实现稍微复杂点的功能，今天实现的效果是：类似于listiew展示许多可供订阅的栏目，每个栏目最右端有订阅按钮，用户点击订阅可以订阅该栏目，再次点击可取消订阅，效果图如下，下面我们一步步来实现。
1. 定义主布局文件activity_main.xml主布局非常的简单，只有一个title和一个listview======”center”/><!– listview –><ListView===”1dp”android:scrollbars=”none”/></RelativeLayout>2. 定义listview的item布局list_item.xmlitem布局包含了四个控件，分别是用于显示栏目图标的imageview，显示栏目名称的textview，显示栏目信息的textview和订阅按钮textview。==”60dp”android:orientation=”horizontal” ><LinearLayout=”horizontal” ><ImageView=”match_parent”android:src=”@drawable/ic_launcher” /><LinearLayout==”vertical” ><TextView==”#543254″android:textSize=”16sp” /><TextView===></LinearLayout><TextView======>3. 自定义adapter适配器类MyListAdapter.java代码中已经添加了详细的注释，有问题留言指出哦{/*** 数据源*/private List<Map<String, Object>> dataList;private Context mContext;public MyListAdapter(Context mContext){super();this.mContext = mContext;}/*** 方法名称：setDataSource* 方法描述：设置数据源*/(List<Map<String, Object>> dataList){if (null != dataList){this.dataList = dataList;this.notifyDataSetChanged();}}(){return dataList == null ? 0 : dataList.size();}@Overridepublic Object getItem(int position){return (null != dataList && !dataList.isEmpty()) ? null : dataList.get(position);}(int position){return dataList == null ? 0 : position;}ViewHolder viewHolder = null;@Overridepublic View getView(int position, View convertView, ViewGroup parent){if (null == convertView){viewHolder = new ViewHolder();convertView = LayoutInflater.from(mContext).inflate(R.layout.list_item, parent, false);viewHolder.imageView = (ImageView)convertView.findViewById(R.id.item_image);viewHolder.textName = (TextView)convertView.findViewById(R.id.item_name);viewHolder.textInfo = (TextView)convertView.findViewById(R.id.item_info);viewHolder.subscribe = (TextView)convertView.findViewById(R.id.item_un_subscribe);convertView.setTag(viewHolder);}else{viewHolder = (ViewHolder)convertView.getTag();}//给控件设置数据viewHolder.imageView.setImageResource((int)dataList.get(position).get(MainActivity.KEY[0]));viewHolder.textName.setText((CharSequence)dataList.get(position).get(MainActivity.KEY[1]));viewHolder.textInfo.setText((CharSequence)dataList.get(position).get(MainActivity.KEY[2]));//监听订阅按钮viewHolder.subscribe.setOnClickListener(new MyListener(position));if ((boolean)dataList.get(position).get(MainActivity.KEY[3])){viewHolder.subscribe.setText(“取消订阅”);}else{viewHolder.subscribe.setText(“订阅”);}return convertView;}/**** <点击事件监听>* @version [V1.00, 2015-8-1]* @see [相关类/方法]* @since V1.00*/{int mPosition;public MyListener(int inPosition){mPosition = inPosition;}(View v){//防止监听位置错乱if(v.getId() == viewHolder.subscribe.getId()){//如果是【订阅】设置为【取消订阅】,如果是【取消订阅】设置成【订阅】dataList.get(mPosition).put(MainActivity.KEY[3], !((boolean)dataList.get(mPosition).get(MainActivity.KEY[3])));MyListAdapter.this.notifyDataSetChanged();}}}/**** <重用布局辅助类>* @version [V1.00, 2015-8-1]* @see [相关类/方法]* @since V1.00*/static class ViewHolder{/*** 栏目图标*/private ImageView imageView;/*** 栏目名称*/private TextView textName;/*** 栏目信息*/private TextView textInfo;/*** 订阅*/private TextView subscribe;}}4. 主界面MainActivity.java{private ListView listView;private List<Map<String, Object>> data = new ArrayList<Map<String, Object>>();String KEY[] = new String[] {“image”, “name”, “info”, “sub”};ID[] = new int[] {R.id.item_image, R.id.item_name, R.id.item_info, R.id.item_un_subscribe};IMAGEID[] = new int[] {R.drawable.nba, R.drawable.zipai, R.drawable.iphone, R.drawable.tiyu, R.drawable.yanzhi, R.drawable.zhi, R.drawable.xiaoone, R.drawable.xiaotwo,R.drawable.dou, R.drawable.feiji};private final String NAME[] = new String[] {“NBA”, “自拍是种病”, “iPhone”, “体坛热议”, “拼颜值上头条”, “智能家居”, “笑死不偿命”, “笑话”, “搞笑”, “留学靠自己”};private final String QIANMING[] = new String[] {“324人订阅，78条帖子”, “4人订阅，39条帖子”, “93人订阅，72条帖子”, “124人订阅，75条帖子”, “654人订阅，11条帖子”, “74人订阅，8条帖子”, “34人订阅，323条帖子”, “21人订阅，8条帖子”, “654人订阅，32条帖子”,”4人订阅，878条帖子”};(Bundle savedInstanceState){super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);listView = (ListView)findViewById(R.id.listview);// 构建数据源for (int i = 0; i < 10; i++){Map<String, Object> map = new HashMap<String, Object>();map.put(KEY[0], IMAGEID[i]);map.put(KEY[1], NAME[i]);map.put(KEY[2], QIANMING[i]);//默认未订阅map.put(KEY[3], false);data.add(map);}// 创建适配器adapterMyListAdapter adapter = new MyListAdapter(MainActivity.this);adapter.setDataSource(data);// 设置适配器listView.setAdapter(adapter);//listview每项点击事件listView.setOnItemClickListener(new OnItemClickListener(){(AdapterView<?> parent, View view, int position, long id){Toast.makeText(MainActivity.this, “您点击了【”+data.get(position).get(KEY[1])+”】!”, Toast.LENGTH_LONG).show();}});}}
再来看下完整的效果图：按钮点击+item点击！
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人，都有不能称心如意的时候，都有愿望落空的窘迫，
