Listview 单选

本Demo通过两种途径实现了Listview的单选效果(自定义adapter)

1.点击Listview的item实现单选效果,就是点击item实现单选  

2.点击item上的单选框实现单选效果,就是点击单选框时，实现单选效果

3.点击Listview的item实现单选效果(改进版)

先上效果图：

项目的主目录是

具体实现如下：

主要有四个类：

MainActivity，也就是首页，主要是按钮以及文字。比较简单。

SecondActivity，是点击Listview的item实现单选效果,就是点击item实现单选 ，代码如下：

public class SecondActivity extends Activity {private int cur_pos = -1;// 当前显示的一行,默认为0项选中private List<HashMap<string object="">> list;// 数据private ListView listview;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);// 加载布局listview = (ListView) findViewById(R.id.listview1);//绑定IDlist = new ArrayList<HashMap<string object="">>();// 初始化listsetData();// 加载数据final MyAdapter adapter = new MyAdapter(this);listview.setAdapter(adapter);// 设置适配器listview.setChoiceMode(ListView.CHOICE_MODE_SINGLE);// 一定要设置这个属性，否则ListView不会刷新listview.setOnItemClickListener(new OnItemClickListener() {@Overridepublic void onItemClick(AdapterView<?> arg0, View arg1,int position, long id) {cur_pos = position;// 更新当前行}});}// 填充数据private void setData() {HashMap<string object=""> hashMap;for (int i = 0; i < 20; i++) {hashMap = new HashMap<string object="">();hashMap.put("name", "" + i);hashMap.put("age", " " + i);hashMap.put("image", R.drawable.ic_launcher);list.add(hashMap);}}// 自定义Adapterprivate class MyAdapter extends BaseAdapter {private LayoutInflater inflater;public MyAdapter(Context context) {inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);}@Overridepublic int getCount() {return list.size();}@Overridepublic Object getItem(int position) {return list.get(position);}@Overridepublic long getItemId(int position) {return position;}@Overridepublic View getView(int position, View convertView, ViewGroup parent) {convertView = inflater.inflate(R.layout.list_child, null, false);HashMap<string object=""> hashMap = new HashMap<string object="">();hashMap = list.get(position);// 获取点中的数据ViewHold viewHold = new ViewHold();viewHold.img1 = (ImageView) convertView.findViewById(R.id.list_child_im1);viewHold.img2 = (ImageView) convertView.findViewById(R.id.list_child_im2);viewHold.tv1 = (TextView) convertView.findViewById(R.id.list_child_tv1);viewHold.tv2 = (TextView) convertView.findViewById(R.id.list_child_tv2);viewHold.tv1.setText("姓名: jack" + hashMap.get("name").toString());viewHold.tv2.setText("年龄: " + hashMap.get("age").toString());viewHold.img1.setBackgroundResource((Integer) (hashMap.get("image")));if (position == cur_pos) {// 如果当前的行就是ListView中选中的一行，就更改显示样式viewHold.img2.setBackgroundResource(R.drawable.list_child_sel_chech);}return convertView;}class ViewHold {private ImageView img1;private ImageView img2;private TextView tv1;private TextView tv2;}}}ThirdActivity，点击item上的单选框实现单选效果,就是点击单选框时，实现单选效果，主要代码如下： public class ThirdActivity extends Activity {private List<HashMap<string object="">> list;private ListView listview;private ImageView[] btnArr;// 数组@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);// 加载布局listview = (ListView) findViewById(R.id.listview1);// 绑定IDlist = new ArrayList<HashMap<string object="">>();// 初始化listsetData();// 加载数据MyAdapter adapter = new MyAdapter(this);listview.setAdapter(adapter);// 设置适配器}// 填充数据private void setData() {HashMap<string object=""> hashMap;for (int i = 0; i < 20; i++) {hashMap = new HashMap<string object="">();hashMap.put("name", "" + i);hashMap.put("age", " " + i);hashMap.put("image", R.drawable.ic_launcher);list.add(hashMap);}}// 自定义Adapterprivate class MyAdapter extends BaseAdapter {private LayoutInflater inflater;private Context myContent = null;public MyAdapter(Context context) {inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);this.myContent = context;setData();}// 初始化数组private void setData() {btnArr = new ImageView[list.size()];for (int i = 0; i < list.size(); i++) {btnArr[i] = new ImageView(myContent);btnArr[i].setTag(i);}}@Overridepublic int getCount() {return list.size();}@Overridepublic Object getItem(int position) {return list.get(position);}@Overridepublic long getItemId(int position) {return position;}@Overridepublic View getView(int position, View convertView, ViewGroup parent) {convertView = inflater.inflate(R.layout.list_child, null, false);HashMap<string object=""> hashMap = new HashMap<string object="">();hashMap = list.get(position);ViewHold viewHold = new ViewHold();viewHold.img1 = (ImageView) convertView.findViewById(R.id.list_child_im1);viewHold.img2 = (ImageView) convertView.findViewById(R.id.list_child_im2);viewHold.tv1 = (TextView) convertView.findViewById(R.id.list_child_tv1);viewHold.tv2 = (TextView) convertView.findViewById(R.id.list_child_tv2);viewHold.tv1.setText("姓名: jack" + hashMap.get("name").toString());viewHold.tv2.setText("年龄: " + hashMap.get("age").toString());viewHold.img1.setBackgroundResource((Integer) (hashMap.get("image")));btnArr[position] = viewHold.img2;btnArr[position].setTag(position);convertView.setTag(viewHold);// 填设置监听器viewHold.img2.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {// TODO Auto-generated method stubfor (int i = 0; i < list.size(); i++) {if (v.getTag().equals(i)) {// 按下时改变背景btnArr[i].setBackgroundResource(R.drawable.list_child_sel_chech);} else {btnArr[i].setBackgroundResource(R.drawable.list_child_sel_nocheck);}}}});return convertView;}class ViewHold {private ImageView img1;private ImageView img2;private TextView tv1;private TextView tv2;}}}

以上就是具体实现Listview的单选效果，Demo里面用到的布局、图片资源都放在下载里面去了，用到的朋友欢迎下载！有什么问题请留言！

PS 经过测试,发现点击item实现单选效果在4.0上失效,于是经过改进,

FourthActivity，点击Listview的item实现单选效果(改进版)，主要代码如下： public class FourthActivity extends Activity {private List<HashMap<string object="">> list;private ListView listview;MyAdapter adapter;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);listview = (ListView) findViewById(R.id.listview1);list = new ArrayList<HashMap<string object="">>();setData();adapter = new MyAdapter(this);listview.setAdapter(adapter);listview.setOnItemClickListener(new OnItemClickListener() {@Overridepublic void onItemClick(AdapterView<?> arg0, View view,int position, long id) {for (int i = 0; i < list.size(); i++) {if (position == i) {if (adapter.isSelected.get(position)) {adapter.isSelected.put(position, false); // 同时修改map的值保存状态} else {adapter.isSelected.put(position, true); // 同时修改map的值保存状态}} else {adapter.isSelected.put(i, false); // 同时修改map的值保存状态}}adapter.notifyDataSetChanged();}});}// 设置数据private void setData() {HashMap<string object=""> hashMap;for (int i = 0; i < 20; i++) {hashMap = new HashMap<string object="">();hashMap.put("name", "" + i);hashMap.put("age", " " + i);hashMap.put("image", R.drawable.ic_launcher);list.add(hashMap);}}private class MyAdapter extends BaseAdapter {private LayoutInflater inflater;public HashMap<integer boolean=""> isSelected;public MyAdapter(Context context) {inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);init();}// 初始化 设置所有checkbox都为未选择public void init() {isSelected = new HashMap<integer boolean="">();for (int i = 0; i < list.size(); i++) {isSelected.put(i, false);}}@Overridepublic int getCount() {return list.size();}@Overridepublic Object getItem(int position) {return list.get(position);}@Overridepublic long getItemId(int position) {return position;}@SuppressWarnings("unused")@Overridepublic View getView(int position, View convertView, ViewGroup parent) {ViewHolder viewHold = null;if (viewHold == null) {viewHold = new ViewHolder();if (convertView == null) {convertView = inflater.inflate(R.layout.list_child1, null,false);}viewHold.img1 = (ImageView) convertView.findViewById(R.id.list_child1_im1);viewHold.cb = (CheckBox) convertView.findViewById(R.id.list_child1_check2);viewHold.tv1 = (TextView) convertView.findViewById(R.id.list_child1_tv1);viewHold.tv2 = (TextView) convertView.findViewById(R.id.list_child1_tv2);} else {viewHold = (ViewHolder) convertView.getTag();}HashMap<string object=""> hashMap = new HashMap<string object="">();hashMap = list.get(position);viewHold.tv1.setText("姓名: jack" + hashMap.get("name").toString());viewHold.tv2.setText("年龄: " + hashMap.get("age").toString());viewHold.img1.setBackgroundResource((Integer) (hashMap.get("image")));viewHold.cb.setChecked(isSelected.get(position));return convertView;}class ViewHolder {private ImageView img1;private CheckBox cb;private TextView tv1;private TextView tv2;}}}

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