基于android平台的出题软件---- 每日30题

本app共编写了3个activity，1.Mainactivity作为主界面。2.surface，用来显示随机出的题。3.showresult，用来打印所有做过的题（含结果），一个类function用来随机出题。APK下载链接http://pan.baidu.com/s/1o7fiFNG

开发时间约6个小时

具体调用、跳转如图1

图一  程序整体结构

接下来具体展示每一个模块。

模块1：class：function

使用java自带函数，Random.nextInt()来获得随机数，类中共有两个public Long类型的数据Former和Latter，Former与Latter分别表示算术中运算符前及运算符之后的两个操作数。类中共有五个函数，分别是

• public long getRandom(int num)

• public long setPlus(long former,long latter)

• public long setMinus(long former,long latter)

• public long setMutiply(long former,long latter)

• public long setDivide(long former,long latter)

getrandom函数用来获取随机数，剩余四个用来设置加减乘除的算式，并返回运算结果。具体代码如下

 package com.example.shea.caculator;

 import java.util.Random;

 /**
  * Created by shea on 2016/3/10.
  */
 public class function {
     public  long Former=0;
     public  long Latter=0;
     public long getRandom(int num){
         int NUM=num;
         Random random=new Random();
         int number=random.nextInt(NUM)+1;
         return number;
     }
     public long setPlus(long former,long latter){
         return former+latter;
     }
     public long setMinus(long former,long latter){
         long result=0;
         boolean Flag=true;
         do {
             if (former>latter)
             {
                 Former=former;
                 Latter=latter;
                 Flag=false;
             }
             else
             if (former<latter)
             {
                 Former=latter;
                 Latter=former;
                 Flag=false;
             }
             else {
                 Former=getRandom(100);
                 Latter=getRandom(100);
                 Flag=true;
             }

         }while (Flag);
         result=Former-Latter;
         return result;
     }
     public long setMutiply(long former,long latter){
         return former*latter;
     }
     public long setDivide(long former,long latter)
     {
         long result=0;
         boolean FLAG=true;
         do{

             if (former%latter==0)
             {
                 result=former/latter;
                 FLAG=false;
             }
             else{
                 Former=getRandom(100)+1;
                 Latter=getRandom(19)+1;
                 former=Former;
                 latter=Latter;
                 result=Former/Latter;
                 System.out.println("============"+Former+"==========="+Latter+"===================");
             }

         }while (FLAG);
         return result;
     }
 }

模块2：Activity：surface

本模块负责打印由function获得的随机加减乘除运算，真机运行截图如下。图4是完成三十道题之后的弹窗，此时可以选择再做30道，或者回到首页。做使用过程中，可以点击打印题目按钮获得目前做过的题目及答案，也可以点击回到主页按钮，回到主页。

本模块

public long setquestion()函数负责出题，并且使用textview呈现在surface.java上，

在其中使用int CHOOSENUM=random.nextInt(3);随机获得0-3的某个int类型的数，分别对应加减乘除，使用switch case跳转至对应出题方式。

图二

图三

图四

本模块代码如下：

 package com.example.shea.caculator;
 //ray's work
 //2013040101016
 //雷翔宇

 import android.app.AlertDialog;
 import android.content.DialogInterface;
 import android.content.Intent;
 import android.graphics.Color;
 import android.support.v7.app.AppCompatActivity;
 import android.os.Bundle;
 import android.view.View;
 import android.widget.Button;
 import android.widget.EditText;
 import android.widget.TextView;
 import android.widget.Toast;

 import java.util.ArrayList;
 import java.util.Random;

 public class surface extends AppCompatActivity {
     private long former=0;
     private long latter=0;
     private long result=0;
     private long count=1;
     private long RIGHT=0;
     private float percentage=0;
     ArrayList<String> arrayList=new ArrayList<String>();

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.surface_layout);
         final EditText editText= (EditText) findViewById(R.id.INPUTTEXT);
         Button next= (Button) findViewById(R.id.next);
         Button homepage= (Button) findViewById(R.id.homepage);
         Button submit=(Button)findViewById(R.id.submit);
         final TextView countnum= (TextView) findViewById(R.id.countnum);
         final Button back2home=(Button)findViewById(R.id.backtohome);
         setquestion();
         back2home.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v) {

                 Intent back=new Intent(surface.this,MainActivity.class);
                 startActivity(back);
             }
         });

         homepage.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v) {
                /* Intent intent = new Intent(surface.this, MainActivity.class);
                 startActivity(intent);*/
                 StringBuffer partinfo=new StringBuffer("");
                 StringBuffer ALLINFO=new StringBuffer("");
                 for (int i = 0; i <arrayList.size() ; i++) {
                     //allquestions.add(arrayList.get(i));
                     String info=  arrayList.get(i);
                     partinfo.append(info+"\n");
                     //ALLINFO.append(partinfo);
                 }
                 String allinfo=partinfo.toString();
                 Intent intent=new Intent(surface.this,showresult.class);
                 intent.putExtra("data",allinfo);
                 startActivity(intent);

             }
         });
         submit.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v) {
                 String getnum = editText.getText().toString();
                 int GETNUM = Integer.valueOf(getnum);
                 if (GETNUM == result) {
                     Toast.makeText(surface.this, "回答正确~", Toast.LENGTH_SHORT).show();
                     RIGHT++;
                 } else {
                     Toast.makeText(surface.this,"做错了呢~请再细心计算一遍",Toast.LENGTH_SHORT).show();
                 }

             }
         });
         next.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v) {
                 editText.setText("");
                 countnum.setText("已经做了"+count+"道题,做对"+RIGHT+"道\n");count++;
                 if (count>30) {
                     /*Toast.makeText(surface.this, "今天的30道题已经完成啦，你真棒！~", Toast.LENGTH_LONG).show();*/
                     count=30;
                     new AlertDialog.Builder(surface.this).setMessage("今天的任务完成啦！").setPositiveButton("查看今天的题目", new DialogInterface.OnClickListener() {
                         @Override
                         public void onClick(DialogInterface dialog, int which) {
                             StringBuffer partinfo=new StringBuffer("");
                             StringBuffer ALLINFO=new StringBuffer("");
                             for (int i = 0; i <arrayList.size() ; i++) {
                                 //allquestions.add(arrayList.get(i));
                                 String info=  arrayList.get(i);
                                 partinfo.append(info+"\n");
                                 //ALLINFO.append(partinfo);
                             }
                             String allinfo=partinfo.toString();
                             Intent intent=new Intent(surface.this,showresult.class);
                             intent.putExtra("data",allinfo);
                             startActivity(intent);
                         }
                     }).setNegativeButton("再来三十道！", new DialogInterface.OnClickListener() {
                         @Override
                         public void onClick(DialogInterface dialog, int which) {
                             count=1;
                             countnum.setText("");
                             setquestion();
                         }
                     }).create().show();

                         }
                 else
                 result=setquestion();
             }
         });

     }
     public long setquestion(){
         TextView textView= (TextView) findViewById(R.id.textView);
         function myfunc=new function();
         former=myfunc.getRandom(100)+1;
         latter=myfunc.getRandom(100)+1;
         Random random=new Random();
         int CHOOSENUM=random.nextInt(3);
         //int CHOOSENUM = 1;
         switch (CHOOSENUM)
         {
             case 0:{result=myfunc.setPlus(former,latter);
                 textView.setText(former + "+" + latter+"=");
                 String text=former + "+" + latter+"="+result;
                 arrayList.add(text);
             }
             break;
             case 1:{result=myfunc.setDivide(former,latter);
                 textView.setText(myfunc.Former + "÷" + myfunc.Latter+"=");
                 String text=myfunc.Former + "÷" + myfunc.Latter+"="+result;
                 arrayList.add(text);
             }
             break;
             case 2:{
                 result=myfunc.setMinus(former,latter);
                 textView.setText(myfunc.Former + "-" + myfunc.Latter+"=");
                 String text=myfunc.Former + "-" + myfunc.Latter+"="+result;
                 arrayList.add(text);
             }
             break;
             case 3:{
                 result=myfunc.setMutiply(former,latter);
                 textView.setText(myfunc.Former + "×" + myfunc.Latter+"=");
                 String text=myfunc.Former + "×" + myfunc.Latter+"="+result;
                 arrayList.add(text);
             }
             break;
         }
         return result;

     }
 }

模块3 Activity showresult

本模块负责打印已经做过的所有题目，因为在ACTIVITY：surface中使用intent进行跳转，故使用intent的putextra方法传递所有题目数据，在activity中添加了scrollview及嵌套的textview来展示结果。效果图如下

本模块代码如下

 package com.example.shea.caculator;
 //ray's work
 //2013040101016
 //雷翔宇

 import android.content.Intent;
 import android.support.v7.app.AppCompatActivity;
 import android.os.Bundle;
 import android.view.View;
 import android.widget.Button;
 import android.widget.ListView;
 import android.widget.TextView;

 import java.util.ArrayList;

 public class showresult extends AppCompatActivity {

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_showresult);
         Button back2homepage= (Button) findViewById(R.id.back2homepage);
         TextView textview= (TextView) findViewById(R.id.textView2);
         Intent i=getIntent();
         String info=i.getStringExtra("data");
         textview.setText(info);
         back2homepage.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v) {
                 Intent back2homepage=new Intent(showresult.this,MainActivity.class);
                 startActivity(back2homepage);
             }
         });
     }
 }

因时间关系，程序内存在一些错误未能及时更正，还请海涵。