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android开发步步为营之24：milliondollars游戏技术要点代码生成控件和读取xml文件

2024-07-24 01:29:50   219人阅读

   Milliondollars智力问答游戏，主要的技术要点（一）、读取题库数据xml文件（二）、如何动态的生成题目和选项。这里做个总结，供以后参考。
（一）、读取题库数据xml文件
将assets/topics.xml文件读取
topics.xml格式：
<?xml version="1.0" encoding="UTF-8"?>
<book>
    <question topic="《全唐诗》是哪个时期的人编辑的？">
       <a>清朝</a>
       <b>唐朝</b>
       <c>明朝</c>
       <d>元朝</d>
       <answer>清朝</answer>
    </question>
    <question topic="荷兰是国花是？">
       <a>荷花</a>
       <b>玫瑰</b>
       <c>风信子</c>
       <d>郁金香</d>
       <answer>郁金香</answer>
    </question>
    <question topic="乐山大佛历经多少年方才建成？">
       <a>90</a>
       <b>80</b>
       <c>70</c>
       <d>60</d>
       <answer>90</answer>
    </question>
    <question topic="人的自我意识是从什么时候产生的？">
       <a>2岁左右</a>
       <b>1岁左右</b>
       <c>3岁左右</c>
       <d>4岁左右</d>
       <answer>1岁左右</answer>
    </question>
</book>
读取代码：
/**
     * 从xml中读取所有的题目
     */
    public void readTopicXml() {
       DocumentBuilderFactory docBuilderFactory = null;
       DocumentBuilder docBuilder = null;
       Document doc = null;
       try {
           docBuilderFactory = DocumentBuilderFactory.newInstance();
           docBuilder = docBuilderFactory.newDocumentBuilder();
           // xml file 放到 assets目录中的
           doc = docBuilder.parse(this.getResources().getAssets()
                  .open("topics.xml"));
           // root element
           Element root = doc.getDocumentElement();
           // 获取所有的题目
           NodeList nodeList = root.getElementsByTagName("question");
           topics = new ArrayList<Topic>();
           int nodelength = nodeList.getLength();
           for (int a = 0; a < nodelength; a++) {
              Node nd = nodeList.item(a);
              Topic tp = new Topic();
              tp.topicid = a;
              // topics
              tp.topic = nd.getAttributes().item(0).getNodeValue();
              // items and answer
              NodeList nl = nd.getChildNodes();
              int childCount = nl.getLength();
              for (int b = 0; b < childCount; b++) {
                  Node ndchild = nl.item(b);
                  if (ndchild instanceof Element) {
                     if (ndchild.getNodeName().equals("a")) {
                         tp.a = ndchild.getTextContent();
                     }
                     if (ndchild.getNodeName().equals("b")) {
                         tp.b = ndchild.getTextContent();
                     }
                     if (ndchild.getNodeName().equals("c")) {
                         tp.c = ndchild.getTextContent();
                     }
                     if (ndchild.getNodeName().equals("d")) {
                         tp.d = ndchild.getTextContent();
                     }
                     if (ndchild.getNodeName().equals("answer")) {
                         tp.answer = ndchild.getTextContent();
                     }
                  }
 
              }
 
              topics.add(tp);
           }
 
       } catch (Exception e) {
           Log.e("err", e.getMessage());
           Log.e("err", e.getStackTrace().toString());
       } finally {
           doc = null;
           docBuilder = null;
           docBuilderFactory = null;
           Date d = new Date();
           Log.i("info", d.toLocaleString()
                  + ":MillionaireActivity.readTopicXml complete");
       }
    }
 
 
（二）、如何动态的生成题目和选项
/**
     * 动态设置页面
     *
     * @param topics
     */
    public void setLayout(List<Topic> topics) {
       try {
 
           int count = topics.size();
           Random r = new Random();
           int index = r.nextInt(count);
           while (al.indexOf(index) != -1) {
              index = r.nextInt(count);
           }
           al.add(index);// 已选择的题目
 
           // scroll view
           ScrollView sv = new ScrollView(this);
           RelativeLayout.LayoutParams svp = new RelativeLayout.LayoutParams(
                  RelativeLayout.LayoutParams.FILL_PARENT,
                  RelativeLayout.LayoutParams.FILL_PARENT);
           sv.setLayoutParams(svp);
           setContentView(sv);
 
           // relative layout
           RelativeLayout svlayout = new RelativeLayout(this);
           svlayout.setLayoutParams(svp);
           sv.addView(svlayout);
           tcRadom = topics.get(index);
           // TextView
           // 当前 得分
           RelativeLayout.LayoutParams tp = new RelativeLayout.LayoutParams(
                  RelativeLayout.LayoutParams.FILL_PARENT, RelativeLayout.LayoutParams.WRAP_CONTENT);
           tp.topMargin = 8;
           tp.leftMargin = 8;
           tp.rightMargin = 8;
           TextView tv = new TextView(this);
           tv.setId(USER_ID + 1);
 
           tv.setText("当前得分:" + total + "美元");
//         tv.setTextColor(Color.RED);
           tv.setLayoutParams(tp);
           svlayout.addView(tv);
 
           // 题目
           RelativeLayout.LayoutParams tpTopic = new RelativeLayout.LayoutParams(
                  RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT);
           tpTopic.topMargin = 8;
           tpTopic.leftMargin = 8;
           tpTopic.rightMargin = 8;
           tpTopic.addRule(RelativeLayout.BELOW, USER_ID + 1);
           TextView tvTopic = new TextView(this);
           tvTopic.setId(USER_ID + 2);
 
           tvTopic.setText(tcRadom.topic);
//         tvTopic.setTextColor(Color.MAGENTA);
           tvTopic.setLayoutParams(tpTopic);
           svlayout.addView(tvTopic);
           // RadioGroup 选项
           items.clear();// 选择的题目对应的选项先清空
           alChoseItems.clear();// 已经随机选出的选项先清空
           items.add(tcRadom.a);
           items.add(tcRadom.b);
           items.add(tcRadom.c);
           items.add(tcRadom.d);
           RelativeLayout.LayoutParams rp = new RelativeLayout.LayoutParams(
                  RelativeLayout.LayoutParams.FILL_PARENT, RelativeLayout.LayoutParams.WRAP_CONTENT);
           rp.topMargin = 8;
           rp.leftMargin = 8;
           rp.rightMargin = 8;
           rp.addRule(RelativeLayout.BELOW, USER_ID + 2);
           RadioGroup rg = new RadioGroup(this);
           rg.setId(USER_ID + 3);
 
           Random ra = new Random();
           // A选项随机抽取
           int itemAIndex = ra.nextInt(4);
           while (alChoseItems.indexOf(itemAIndex) != -1) {
              itemAIndex = ra.nextInt(4);
           }
           alChoseItems.add(itemAIndex);
           RadioButton rba = new RadioButton(this);
           rba.setText("A." + items.get(itemAIndex));
 
           // B选项随机抽取
           int itemBIndex = ra.nextInt(4);
           while (alChoseItems.indexOf(itemBIndex) != -1) {
              itemBIndex = ra.nextInt(4);
           }
           alChoseItems.add(itemBIndex);
           RadioButton rbb = new RadioButton(this);
           rbb.setText("B." + items.get(itemBIndex));
 
           // C选项随机抽取
           int itemCIndex = ra.nextInt(4);
           while (alChoseItems.indexOf(itemCIndex) != -1) {
              itemCIndex = ra.nextInt(4);
           }
           alChoseItems.add(itemCIndex);
           RadioButton rbc = new RadioButton(this);
           rbc.setText("C." + items.get(itemCIndex));
 
           // D选项随机抽取
           int itemDIndex = ra.nextInt(4);
           while (alChoseItems.indexOf(itemDIndex) != -1) {
              itemDIndex = ra.nextInt(4);
           }
           alChoseItems.add(itemDIndex);
           RadioButton rbd = new RadioButton(this);
           rbd.setText("D." + items.get(itemDIndex));
 
           rg.addView(rba);
           rg.addView(rbb);
           rg.addView(rbc);
           rg.addView(rbd);
           rg.setLayoutParams(rp);
           svlayout.addView(rg);
 
           // Button 确定答题
           RelativeLayout.LayoutParams bp = new RelativeLayout.LayoutParams(
                  150, RelativeLayout.LayoutParams.WRAP_CONTENT);
           bp.topMargin = 8;
           bp.leftMargin = 8;
           bp.rightMargin = 8;
           bp.addRule(RelativeLayout.BELOW, USER_ID + 3);
           Button btn = new Button(this);
           btn.setId(USER_ID + 4);
           btn.setText("确     定");
           btn.setLayoutParams(bp);
           btn.setOnClickListener(this);
           svlayout.addView(btn);
 
           // TextView 是否回答正确提示
           RelativeLayout.LayoutParams tpTip = new RelativeLayout.LayoutParams(
                  RelativeLayout.LayoutParams.FILL_PARENT, RelativeLayout.LayoutParams.WRAP_CONTENT);
           tpTip.topMargin = 8;
           tpTip.leftMargin = 8;
           tpTip.rightMargin = 8;
           tpTip.addRule(RelativeLayout.BELOW, USER_ID + 4);
           TextView tvTip = new TextView(this);
           tvTip.setId(USER_ID + 5);
           tvTip.setLayoutParams(tpTip);
           svlayout.addView(tvTip);
       } catch (Exception ex) {
           Date d = new Date();
           Log.i("err", d.toLocaleString() + ":MillionaireActivity.setLayout error,"
                  + ex.getStackTrace());
       }
       Date d = new Date();
       Log.i("info", d.toLocaleString() + ":MillionaireActivity.setLayout complete");

android开发步步为营之24：milliondollars游戏技术要点代码生成控件和读取xml文件


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