首页 > 代码库 > "小明爸爸的四则运算" Android_版
"小明爸爸的四则运算" Android_版
程序一早就写完了，一直没时间写博客，时间也快截止了，还是来写了。
一，需求分析
初步计划是写一个简单的自动控制器给出n道简单的加减乘除的四则运算题目（含表达式和答案），为了方便使用及推广，使用平台android.编译平台eclipse.
用户给出需要的题目量n以及题目内数字个数m，程序取得需求生成n个题目类的实例对象，设置对象的属性数字个数为m，并生成四则运算表达式和答案
二，概要设计
算法方面无特殊，全是基本操作
三，详细设计及编码
安卓基本开发 + 基础程序设计
ActivityMain类
主界面没什么好说的。代码也没几行，获取基本的组件，设置属性，over
EquationActivity类
答题界面，通过主界面交互得到的数据创建适配器，动态显示题目列表
1 package com.magician.mathmagic.ui; 2 3 import android.app.ActionBar; 4 import android.app.Activity; 5 import android.os.Bundle; 6 import android.view.Menu; 7 import android.view.MenuItem; 8 import android.widget.ListView; 9 10 import com.magician.mathmagic.adapter.AdapterEquation;11 import com.magician.mathmagic.controller.Intelligent;12 import com.magician.mathmagic.model.Equation;13 14 public class EquationActivity extends Activity {15 16 private ListView listEquation;17 private AdapterEquation adapterEquation;18 private Intelligent intelligent;19 20 @Override21 protected void onCreate(Bundle savedInstanceState) {22 super.onCreate(savedInstanceState);23 setContentView(R.layout.activity_equation);24 25 ActionBar actionBar = getActionBar(); 26 actionBar.setDisplayHomeAsUpEnabled(true); 27 28 initView();29 initData();30 }31 32 private void initView() {33 34 listEquation = (ListView) findViewById(R.id.list_equation_equationlist);35 }36 37 private void initData() {38 39 int quantity, grade, numbers, bracket;40 41 Bundle bundle = getIntent().getExtras();42 quantity = bundle.getInt("quantity");43 grade = bundle.getInt("grade");44 numbers = bundle.getInt("numbers");45 bracket = bundle.getInt("bracket");46 47 intelligent = new Intelligent(quantity, grade, numbers, bracket);48 adapterEquation = new AdapterEquation(EquationActivity.this, intelligent);49 int i = 0;50 for (Equation equation : intelligent.getEquationList()) {51 i++;52 System.out.println(i + " " + equation.toString() + " " + equation.getAnswer());53 }54 listEquation.setAdapter(adapterEquation);55 }56 57 @Override58 public boolean onCreateOptionsMenu(Menu menu) {59 // Inflate the menu; this adds items to the action bar if it is present.60 getMenuInflater().inflate(R.menu.equation, menu);61 return true;62 }63 64 @Override 65 public boolean onOptionsItemSelected(MenuItem item) { 66 switch (item.getItemId()) { 67 case android.R.id.home: 68 finish();69 return true;70 }71 return false; 72 } 73 }
AdapterEquation类
自定义的列表适配器，通过界面层传输的数据给出相应的处理之后返回界面效果给界面层
主要是创建一个管理者对象管理四则运算。
1 /************************************************************************************** 2 * 3 * [Project] 4 * MathMagic 5 * [Package] 6 * com.magician.mathmagic.adapter 7 * [FileName] 8 * AdapterEquation.java 9 * [Copyright] 10 * Copyright 2014 brotherYang All Rights Reserved. 11 * [History] 12 * @Version : 1.0.0 13 * @User : Administrator 14 * @Time : 2014-10-7 - 下午8:15:08 15 * @Auther : brotherYang (include18883287887@gamil.com) 16 * @Record : Create 17 * 18 **************************************************************************************/ 19 20 package com.magician.mathmagic.adapter; 21 22 import java.util.HashMap; 23 import java.util.LinkedList; 24 import java.util.Map; 25 26 import android.app.Activity; 27 import android.content.Context; 28 import android.text.Editable; 29 import android.text.TextWatcher; 30 import android.view.LayoutInflater; 31 import android.view.View; 32 import android.view.ViewGroup; 33 import android.widget.BaseAdapter; 34 import android.widget.Button; 35 import android.widget.EditText; 36 import android.widget.TextView; 37 import android.widget.Toast; 38 39 import com.magician.mathmagic.controller.Intelligent; 40 import com.magician.mathmagic.model.Equation; 41 import com.magician.mathmagic.ui.R; 42 43 public class AdapterEquation extends BaseAdapter{ 44 45 private LinkedList<Map<String, String>> aEquationItemData; 46 private Map<String, String> aEditorValue; 47 private Map<String, String> aAnswer; 48 49 private Intelligent intelligent; 50 private Equation equation; 51 private LayoutInflater aInflater; 52 private ViewHolder aHolder; 53 private Activity aContext; 54 55 public AdapterEquation (Context context, Intelligent intelligent) { 56 this.intelligent = intelligent; 57 this.aContext = (Activity) context; 58 this.aInflater = (LayoutInflater) context 59 .getSystemService(Context.LAYOUT_INFLATER_SERVICE); 60 61 init(); 62 } 63 64 // 初始化 65 private void init() { 66 aEquationItemData = http://www.mamicode.com/new LinkedList<Map<String,String>>(); 67 aEditorValue = http://www.mamicode.com/new HashMap<String, String>(); 68 aAnswer = new HashMap<String, String>(); 69 aEditorValue.clear(); 70 aAnswer.clear(); 71 72 for (int i = 0; i < getCount(); i++) { 73 aEquationItemData.add(i, null); 74 } 75 } 76 77 @Override 78 public int getCount() { 79 return intelligent.getEquationList().size(); 80 } 81 82 @Override 83 public Object getItem(int position) { 84 return intelligent.getEquationList().get(position); 85 } 86 87 @Override 88 public long getItemId(int position) { 89 return position; 90 } 91 92 @Override 93 public View getView(final int position, View convertView, ViewGroup parent) { 94 if (convertView == null) { 95 convertView = aInflater.inflate(R.layout.list_item_equation, null); 96 aHolder = new ViewHolder(); 97 98 aHolder.vBtonSubmit = (Button) convertView.findViewById(R.id.bton_equation_submit); 99 aHolder.vTexvWitchOne = (TextView) convertView.findViewById(R.id.texv_equation_witchone);100 aHolder.vTexvEquation = (TextView) convertView.findViewById(R.id.texv_equation_content);101 aHolder.vEditYourAnswer = (EditText) convertView.findViewById(R.id.edit_equation_youranswer);102 aHolder.vTexvAnswer = (TextView) convertView.findViewById(R.id.texv_equation_rightanswer);103 aHolder.vEditYourAnswer.setTag(position);104 aHolder.vBtonSubmit.setTag(position);105 convertView.setTag(aHolder);106 convertView.setId(position);107 ClearHolder(aHolder);108 } else {109 aHolder = (ViewHolder) convertView.getTag();110 ClearHolder(aHolder);111 aHolder.vEditYourAnswer.setTag(position);112 aHolder.vBtonSubmit.setTag(position);113 }114 115 equation = intelligent.getEquationList().get(position);116 aHolder.vRightAnswer = (equation.getAnswer());117 aHolder.vTexvWitchOne.setText((position+1) + " : ");118 aHolder.vTexvEquation.setText(equation.toString()); 119 120 class ATextWatcher implements TextWatcher {121 public ATextWatcher(ViewHolder holder) {122 mHolder = holder;123 }124 125 private ViewHolder mHolder;126 127 @Override128 public void onTextChanged(CharSequence s, int start,129 int before, int count) {130 }131 132 @Override133 public void beforeTextChanged(CharSequence s, int start,134 int count, int after) {135 }136 137 @Override138 public void afterTextChanged(Editable s) {139 if (s != null && !"".equals(s.toString())) {140 int position = (Integer) mHolder.vEditYourAnswer.getTag();141 aEditorValue.put(String.valueOf(position), s.toString());142 // 当EditText数据发生改变的时候存到data变量中143 }144 }145 }146 147 aHolder.vEditYourAnswer.addTextChangedListener(new ATextWatcher(aHolder));148 aHolder.vEditYourAnswer.setText(null == aEditorValue.get(String.valueOf(position)) ? "" : aEditorValue.get(String.valueOf(position)));149 aHolder.vTexvAnswer.setText(null == aEquationItemData.get(position) ? "" : aEquationItemData.get(position).get("answer"));150 aHolder.vBtonSubmit.setEnabled(!intelligent.getEquationList().get(position).isRight());151 aHolder.vBtonSubmit.setOnClickListener(new View.OnClickListener() {152 @Override153 public void onClick(View v) {154 155 // TODO Auto-generated method stub156 aHolder.vYourAnswer = aEditorValue.get(String.valueOf(position));157 aHolder.vRightAnswer = (intelligent.getEquationList()158 .get(position).getAnswer());159 int tPosition = (Integer) v.getTag();160 161 if (null == (aHolder.vYourAnswer)) {162 Toast.makeText(aContext, "题目 " + (tPosition+1) +" 答案为空！", Toast.LENGTH_SHORT).show();163 return;164 }165 intelligent.getEquationList().get(tPosition).setAnswered(true);166 if (Double.valueOf(aHolder.vYourAnswer) == (aHolder.vRightAnswer)) {167 168 aAnswer = new HashMap<String, String>();169 aAnswer.put("answer", "回答正确！");170 aEquationItemData.remove(tPosition);171 aEquationItemData.add(tPosition, aAnswer);172 intelligent.getEquationList().get(tPosition).setRight(true);173 } else {174 aAnswer = new HashMap<String, String>();175 aAnswer.put("answer", "回答错误！正确答案是 : " + aHolder.vRightAnswer);176 aEquationItemData.remove(tPosition);177 aEquationItemData.add(tPosition, aAnswer);178 }179 notifyDataSetChanged();180 }181 });182 183 return convertView;184 }185 186 /**187 * 188 */189 private void ClearHolder(ViewHolder holder) {190 // TODO Auto-generated method stub191 holder.vTexvWitchOne.setText("");192 holder.vTexvEquation.setText("");193 holder.vTexvAnswer.setText("");194 holder.vEditYourAnswer.setText("");195 }196 197 public final class ViewHolder {198 public View vBaseView;199 public int vPosition;200 public TextView vTexvWitchOne;201 public TextView vTexvEquation;202 public TextView vTexvAnswer;203 public EditText vEditYourAnswer;204 public Button vBtonSubmit;205 206 public String vEquation;207 public String vYourAnswer;208 public double vRightAnswer;209 }210 }
Intelligent类
管理者，适配器传输的数据给出相应的动作，创建四则运算方程式
1 /** 2 * 方程式集合 3 */ 4 private LinkedList<Equation> equationList; 5 6 /** 7 * 初始化题目数量 8 */ 9 private int quantity;10 11 /**12 * 构造方程式13 */14 public Intelligent(int quantity, int grade, int numbers, int bracket) {15 // TODO Auto-generated constructor stub16 this.quantity = quantity;17 18 equationList = new LinkedList<Equation>();19 for (int i = 0; i < quantity; i++) {20 equationList.addLast(new Equation(grade, numbers, bracket));21 }22 }
Equation类
方程式，通过初始化各属性生成四则运算表达式以及答案。
1 /************************************************************************************** 2 * 3 * [Project] 4 * MathMagic 5 * [Package] 6 * com.magician.mathmagic.model 7 * [FileName] 8 * Equation.java 9 * [Copyright] 10 * Copyright 2014 brotherYang All Rights Reserved. 11 * [History] 12 * @Version : 1.0.0 13 * @User : Administrator 14 * @Time : 2014-10-7 - 下午7:22:16 15 * @Auther : brotherYang (include18883287887@gamil.com) 16 * @Record : Create 17 * 18 **************************************************************************************/ 19 20 package com.magician.mathmagic.model; 21 22 import java.text.DecimalFormat; 23 import java.util.LinkedList; 24 import java.util.Random; 25 26 public class Equation { 27 28 /** 29 * 用于存放数的列表 30 */ 31 private LinkedList<String> numberList; 32 33 /** 34 * 用于存放計算符号的列表 35 */ 36 private LinkedList<String> arithmeticList; 37 38 private LinkedList<String> calculateList; 39 40 /** 41 * 初始化题目难度 - 年级（1-6） 42 */ 43 private int grade; 44 45 /** 46 * 初始化几个数字 - 个数（2-3） 47 */ 48 private int numbers; 49 50 /** 51 * 初始化是否有括号 52 */ 53 private int bracket; 54 55 /** 56 * 初始化括号数量 57 */ 58 private int numBracket; 59 60 /** 61 * 算法 - （ " + ", " - ", " * ", " / "） 62 */ 63 public static class Arithmetic { 64 65 public static final int plus = 0; 66 public static final int minus = 1; 67 public static final int multiply = 2; 68 public static final int divide = 3; 69 public static final int bracket = 0; 70 public static final int nobracket = 1; 71 public static final int randombracket = 2; 72 public static final int[] maxnumber = { 10, 30, 60, 100, 500, 1000 }; 73 public static final double wrongnumber = -2147483647; 74 }; 75 76 /** 77 * 方程式的答案 78 */ 79 private double answer; 80 81 /** 82 * 方程式的字符串 83 */ 84 private StringBuilder stringEquation; 85 86 /** 87 * 是否回答 88 */ 89 private boolean isAnswered; 90 91 /** 92 * 是否回答正确 93 */ 94 private boolean isRight; 95 96 /** 97 * @param grade 98 * @param numbers 99 * @param isBracket100 */101 public Equation(int grade, int numbers, int bracket) {102 this.grade = grade;103 this.numbers = numbers;104 this.bracket = bracket;105 106 if (bracket == Arithmetic.randombracket) {107 bracket = new Random().nextInt(2);108 }109 110 if (bracket == Arithmetic.nobracket) {111 numBracket = 0;112 } else {113 numBracket = new Random().nextInt(numbers - 1);114 }115 116 isAnswered = false;117 isRight = false;118 numberList = new LinkedList<String>();119 arithmeticList = new LinkedList<String>();120 calculateList = new LinkedList<String>();121 answer = Arithmetic.wrongnumber;122 stringEquation = new StringBuilder();123 124 for (int i = 0; i < numbers; i++) {125 numberList.add(String.valueOf((new Random()126 .nextInt(Arithmetic.maxnumber[3]) + 1)));127 stringEquation.append(numberList.get(i) + " ");128 if (i < numbers - 1) {129 arithmeticList.add(generateArithmetic());130 stringEquation.append(arithmeticList.get(i) + " ");131 }132 }133 134 calculateAnswer();135 }136 137 /**138 * 139 */140 private String generateArithmetic() {141 // TODO Auto-generated method stub142 143 int intArithmetic = new Random().nextInt(4);144 145 switch (intArithmetic) {146 case Arithmetic.plus:147 return "+";148 case Arithmetic.minus:149 return "-";150 case Arithmetic.multiply:151 return "*";152 case Arithmetic.divide:153 return "/";154 default:155 return null;156 }157 }158 159 /**160 * (non-Javadoc)161 * 162 * @see java.lang.Object#toString()163 */164 @Override165 public String toString() {166 // TODO Auto-generated method stub167 return stringEquation.toString();168 }169 170 /**171 * 172 */173 private void calculateAnswer() {174 // TODO Auto-generated method stub175 176 for (int i = 0; i < numberList.size(); i++) {177 calculateList.addLast(numberList.get(i));178 while (i < arithmeticList.size()) {179 if (arithmeticList.get(i).equals("*")) {180 calculateList.addLast(String.valueOf(Double181 .valueOf(calculateList.removeLast())182 * Double.valueOf(numberList.remove(i + 1))));183 arithmeticList.remove(i);184 } else if (arithmeticList.get(i).equals("/")) {185 calculateList.addLast(String.valueOf(Double186 .valueOf(calculateList.removeLast())187 / Double.valueOf(numberList.remove(i + 1))));188 arithmeticList.remove(i);189 } else {190 calculateList.addLast(arithmeticList.get(i));191 break;192 }193 }194 }195 196 for (String it : calculateList) {197 System.out.println(" content " + it);198 }199 200 while (!calculateList.isEmpty()) {201 if (answer == Arithmetic.wrongnumber) {202 answer = Double.valueOf(calculateList.removeFirst());203 continue;204 }205 String cString = calculateList.removeFirst();206 if (cString.equals("+")) {207 answer += Double.valueOf(calculateList.removeFirst());208 continue;209 } else if (cString.equals("-")) {210 answer -= Double.valueOf(calculateList.removeFirst());211 continue;212 } else {213 System.out.println("Error!");214 }215 }216 217 // 转换保留最后2为小数218 DecimalFormat df = new DecimalFormat(".##");219 answer = Double.valueOf(df.format(answer));220 }221 222 /**223 * @return the numbers224 */225 public int getNumbers() {226 return numbers;227 }228 229 /**230 * @param numbers231 * the numbers to set232 */233 public void setNumbers(int numbers) {234 this.numbers = numbers;235 }236 237 /**238 * @return the grade239 */240 public int getGrade() {241 return grade;242 }243 244 /**245 * @param grade246 * the grade to set247 */248 public void setGrade(int grade) {249 this.grade = grade;250 }251 252 /**253 * @return the isBracket254 */255 public int getBracket() {256 return bracket;257 }258 259 /**260 * @param isBracket261 * the isBracket to set262 */263 public void setBracket(int bracket) {264 this.bracket = bracket;265 }266 267 /**268 * @return the answer269 */270 public double getAnswer() {271 return answer;272 }273 274 /**275 * @param answer276 * the answer to set277 */278 public void setAnswer(double answer) {279 this.answer = answer;280 }281 282 /**283 * @return the isAnswered284 */285 public boolean isAnswered() {286 return isAnswered;287 }288 289 /**290 * @param isAnswered291 * the isAnswered to set292 */293 public void setAnswered(boolean isAnswered) {294 this.isAnswered = isAnswered;295 }296 297 /**298 * @return the isRight299 */300 public boolean isRight() {301 return isRight;302 }303 304 /**305 * @param isRight306 * the isRight to set307 */308 public void setRight(boolean isRight) {309 this.isRight = isRight;310 }311 }
四，测试及性能测试
经过测试，界面不友好，人机交互不友好，存在逻辑上的小bug.
基本操作无误，可以使用。
性能测试
也算是一个性能分析吧，不过也看不出什么来
五，总结
这只是一次小小的软件工程的作业，但里面收获的真的很多，有软件设计的基本流程的进一步巩固，android平台快速开发的经验，代码规范性，软件设计的思想等等，收获颇丰，期待下一次实战。
软件地址：
http://121.42.29.54/upload/MathMagic.apk
百度云盘：
http://pan.baidu.com/s/1bntShm3
"小明爸爸的四则运算" Android_版
声明：以上内容来自用户投稿及互联网公开渠道收集整理发布，本网站不拥有所有权，未作人工编辑处理，也不承担相关法律责任，若内容有误或涉及侵权可进行投诉： 投诉/举报 工作人员会在5个工作日内联系你，一经查实，本站将立刻删除涉嫌侵权内容。