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

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");