用于展现重复性的东西，Listview比较好用，看了别人的自定义Adapter(item是EditText，能够很好地获取到每一个item的EditText值)。又由于在做项目的需要，故特制了一个item包含RadioGroup的Listview的自定义Adapter。

主要功能：

1.将任意数目的单选题(题干和4个选项)展现在界面上；

2.每一题都选择后，提交，可以讲每一题的答案获取到

涉及到两个entity：

public class TopicItem implements Serializable {

private String questionId;//题目id

private String question;//题干

private String answerId;

private String userAnswerId; //选择的答案选项

private List optionList;

public String getQuestionId() {

return questionId;

}

public void setQuestionId(String questionId) {

this.questionId = questionId;

}

public String getQuestion() {

return question;

}

public void setQuestion(String question) {

this.question = question;

}

public String getAnswerId() {

return answerId;

}

public void setAnswerId(String answerId) {

this.answerId = answerId;

}

public String getUserAnswerId() {

return userAnswerId;

}

public void setUserAnswerId(String userAnswerId) {

this.userAnswerId = userAnswerId;

}

public List getOptionList() {

return optionList;

}

public void setOptionList(List optionList) {

this.optionList = optionList;

}

}

public class OptionItem implements Serializable {

private String answerOption;//选项序号

private String answer;//选项文字

public String getAnswerOption() {

return answerOption;

}

public void setAnswerOption(String answerOption) {

this.answerOption = answerOption;

}

public String getAnswer() {

return answer;

}

public void setAnswer(String anwer) {

this.answer = anwer;

}

}

自定义的adapter：

public class TopicAdapter extends BaseAdapter {

private static final String TAG = "TopicAdapter" ;

String KEY = "list_topic_item";

private LayoutInflater mInflater;

private Context context;

private List> mData;

public TopicAdapter(Context context, List> data) {

mData = data;

mInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

this.context = context;

init();

}

private void init() {

mData.clear();

}

@Override

public int getCount() {

int count = mData == null ? 0 : mData.size();

return count ;

}

@Override

public Object getItem(int position) {

/*Object obj = records != null && records.size() > position ? records.get(position) : null;

return obj;*/

return null;

}

@Override

public long getItemId(int position) {

//return position;

return 0;

}

private Integer index = -1;

@Override

public View getView(final int position, View convertView, ViewGroup parent) {

Holder holder = null;

if( convertView == null ){

convertView = mInflater.inflate(R.layout.topic_item, null);

holder = new Holder() ;

holder.question = (TextView)convertView.findViewById(R.id.topic_item_question);

holder.option = (RadioGroup) convertView.findViewById(R.id.topic_item_option);

holder.option1 = (RadioButton) convertView.findViewById(R.id.topic_item_option1);

holder.option2 = (RadioButton) convertView.findViewById(R.id.topic_item_option2);

holder.option3 = (RadioButton) convertView.findViewById(R.id.topic_item_option3);

holder.option4 = (RadioButton) convertView.findViewById(R.id.topic_item_option4);

holder.option.setTag(position);

holder.option.setOnTouchListener(new OnTouchListener() {

@Override

public boolean onTouch(View v, MotionEvent event) {

if (event.getAction() == MotionEvent.ACTION_UP) {

index = (Integer) v.getTag();

}

return false;

}

});

class MyOnCheckedChangeListener implements RadioGroup.OnCheckedChangeListener {

public MyOnCheckedChangeListener(Holder holder) {

mHolder = holder;

}

private Holder mHolder;

@Override

public void onCheckedChanged(RadioGroup group, int checkedId) {

// TODO Auto-generated method stub

int position = (Integer) mHolder.option.getTag();

TopicItem item = mData.get(position).get(KEY);

int RadioButtonId = mHolder.option.getCheckedRadioButtonId();

group.check(RadioButtonId);

RadioButton rb = (RadioButton)mHolder.option.findViewById(RadioButtonId);

if(RadioButtonId==mHolder.option1.getId()){

item.setUserAnswerId(item.getOptionList().get(0).getAnswerOption().trim());

}else if(RadioButtonId==mHolder.option2.getId()){

item.setUserAnswerId(item.getOptionList().get(1).getAnswerOption().trim());

}else if(RadioButtonId==mHolder.option3.getId()){

item.setUserAnswerId(item.getOptionList().get(2).getAnswerOption().trim());

}else if(RadioButtonId==mHolder.option4.getId()){

item.setUserAnswerId(item.getOptionList().get(3).getAnswerOption().trim());

}

mData.get(position).put(KEY, item);

}

}

holder.option.setOnCheckedChangeListener(new MyOnCheckedChangeListener(holder));

convertView.setTag(holder);

}else{

holder = (Holder)convertView.getTag();

holder.option.setTag(position);

}

TopicItem item = (TopicItem)mData.get(position).get(KEY);

if( item != null ){

holder.question.setText(item.getQuestion());

holder.option1.setText(item.getOptionList().get(0).getAnswer().toString());

holder.option2.setText(item.getOptionList().get(1).getAnswer().toString());

holder.option3.setText(item.getOptionList().get(2).getAnswer().toString());

holder.option4.setText(item.getOptionList().get(3).getAnswer().toString());

if(item.getUserAnswerId().trim().equalsIgnoreCase(item.getOptionList().get(0).getAnswerOption().trim())){

holder.option.check(holder.option1.getId());

}

else if(item.getUserAnswerId().trim().equalsIgnoreCase(item.getOptionList().get(1).getAnswerOption().trim())){

holder.option.check(holder.option2.getId());

}else if(item.getUserAnswerId().trim().equalsIgnoreCase(item.getOptionList().get(2).getAnswerOption().trim())){

holder.option.check(holder.option3.getId());

}else if(item.getUserAnswerId().trim().equalsIgnoreCase(item.getOptionList().get(3).getAnswerOption().trim())){

holder.option.check(holder.option4.getId());

}

}

holder.option.clearFocus();

if (index != -1 && index == position) {

holder.option.requestFocus();

}

return convertView;

}

private class Holder{

private TextView question;

private RadioGroup option;

private RadioButton option1;

private RadioButton option2;

private RadioButton option3;

private RadioButton option4;

}

}

应用步骤：

1.定义一些变量，为后面做准备

//Adapter需要该Activity的context

public Context context;

private ListView topic_listview;

private Button button_sent;

private BaseAdapter mAdapter;

//需要将题目数据存在Map中，多个Map组成list，并传给Adapter

//一道题对应一个Map

private List> data = new ArrayList>();

//模拟http获取到的Json类型的数据

JSONObject data_json;

//Map存入数据时的key

String KEY = "list_topic_item";

2.初始化题目数据，这里直接本地编了几道题，可以从服务器上获取

private void initData(){

try {

data_json = new JSONObject();

data_json.put("result", "success");

JSONArray array = new JSONArray();

for(int i=0;i<3;i++){

JSONObject object = new JSONObject();

object.put("questionId", "1");

object.put("question", "康熙是乾隆的谁？");

object.put("answerId", "");

//一开始选择好第三项

object.put("userAnswerId", "3");

JSONArray sarray = new JSONArray();

JSONObject sobject1 = new JSONObject();

sobject1.put("answerOption", "1");

sobject1.put("answer", "儿子");

sarray.put(sobject1);

JSONObject sobject2 = new JSONObject();

sobject2.put("answerOption", "2");

sobject2.put("answer", "爷爷");

sarray.put(sobject2);

JSONObject sobject3 = new JSONObject();

sobject3.put("answerOption", "3");

sobject3.put("answer", "父亲");

sarray.put(sobject3);

JSONObject sobject4 = new JSONObject();

sobject4.put("answerOption", "4");

sobject4.put("answer", "孙子");

sarray.put(sobject4);

object.put("optionList", sarray);

array.put(object);

}

data_json.put("list", array);

} catch (JSONException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

3.将Listview与自定义的TopicAdapter关联起来

this.context = this;

//获取Listview

topic_listview = (ListView)findViewById(R.id.topic_quest_answer);

//data是题目的数据，放在Map里

mAdapter = new TopicAdapter(context, data);

topic_listview.setAdapter(mAdapter);

4.将Json中的题目数据解析并放入data，更新给Adapter，这样关联的Listview此时才将数据显示出来

private void getData(){

System.out.println(data_json.toString());

data.clear();

if(data_json.optString("result").equals("success")){

if(data_json.optJSONArray("list")!=null){

for(int i=0;i

JSONObject object = data_json.optJSONArray("list").optJSONObject(i);

TopicItem topic = new TopicItem();

topic.setAnswerId(object.optString("answerId"));

topic.setQuestionId(object.optString("questionId"));

topic.setQuestion(object.optString("question"));

topic.setUserAnswerId(object.optString("userAnswerId"));

List optionList = new ArrayList();

for(int j=0;j

JSONObject object_option = object.optJSONArray("optionList").optJSONObject(j);

OptionItem option = new OptionItem();

option.setAnswerOption(object_option.optString("answerOption"));

option.setAnswer(object_option.optString("answer"));

optionList.add(option);

}

topic.setOptionList(optionList);

Map list_item = new HashMap();

list_item.put(KEY, topic);

data.add(list_item);

}

//提醒Adapter更新数据，紧接着Listview显示新的数据

mAdapter.notifyDataSetChanged();

}

}

}

5.用户答题，提交题目的答案时，我们可以看到所有的题目及选择的选项：

button_sent = (Button) findViewById(R.id.topic_sent_comment);

button_sent.setOnClickListener(new OnClickListener(){

@Override

public void onClick(View v) {

// TODO Auto-generated method stub

String t="";

for (int i = 0; i < data.size(); i++) {

t = t+"第 "+(i+1)+" 题 ----------->您选择了【选项"

+data.get(i).get(KEY).getUserAnswerId().trim()+"】 \n";

}

Toast.makeText(context, t, Toast.LENGTH_SHORT).show();

}

});

接下来，我们来看具体运行情况：

a.

每一题我设选项都是第三项，object.put(“userAnswerId”, “3”);

b.

接下来人工选择，分别为4,3,2项

c.提交，可以看到提取结果正确

这里想提供一个demo，不知道怎么上传。

demo地址

以前不知道怎么传，现在补上