一、二周冲刺总结

由于刚接触android-app的开发，很多问题都解决不了，连搭建环境都花了一个多星期才能解决，所以用了两周才完成了第一个Spring计划，在此要感谢大为同学的帮助才解决了android开发环境的搭建。

目前程序只有一个简单（渣渣）的界面和最基本的运算功能，在写程序的时候突然想到小学生可能想加强自己薄弱的算法，就加了单项练习这个方面的功能（只是将本来的算法功能拆分了，而且造成了代码重复，这个问题以后再改善），现在的程序还有很多小问题，比如当没有输入答案是按按钮会使程序出错自动退出等，这些问题也会在后续的编写中完善。

一开始接触android开发时根本不理解.java和res文件中layout文件中的.xml文件之间是如何关联起来了，最后是通过慕课网（http://www.imooc.com/）视频学习开始了解android开发的一些思路。

贡献分：

25郑泽成：3.5

38李天麟：3

39吴梓健：10

40钟鹏升：3.5

代码：

src

package com.example.szys;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class MainActivity extends Activity {
    
    Button start,end;
    int yourChose=-1;  
    private void showSinChosDia()  
    {  
        final String[] mList={"普通","困难（未进行）","加法练习","减法练习","乘法练习","除法练习"};  
        yourChose=-1;  
        AlertDialog.Builder sinChosDia=new AlertDialog.Builder(MainActivity.this);  
        sinChosDia.setTitle("难度/单项练习");  
        sinChosDia.setSingleChoiceItems(mList, 0, new DialogInterface.OnClickListener() {  
              
            @Override  
            public void onClick(DialogInterface dialog, int which) {  
                // TODO Auto-generated method stub  
                yourChose=which;  
                  
            }  
        });  
        sinChosDia.setPositiveButton("确定", new DialogInterface.OnClickListener() {  
              
            @Override  
            public void onClick(DialogInterface dialog, int which) {  
                // TODO Auto-generated method stub  
                if(yourChose==0)  
                {  
                    Intent intent = new Intent(MainActivity.this, CalActivity.class); 
                    startActivity(intent); 
                }  
                if(yourChose==1)
                {
                    /*Intent intent = new Intent(MainActivity.this, CalActivity2.class); 
                    startActivity(intent);*/
                }
                if(yourChose==2)
                {
                    Intent intent = new Intent(MainActivity.this, CalActivity2.class); 
                    startActivity(intent);
                }
                if(yourChose==3)
                {
                    Intent intent = new Intent(MainActivity.this, CalActivity3.class); 
                    startActivity(intent);
                }
                if(yourChose==4)
                {
                    Intent intent = new Intent(MainActivity.this, CalActivity4.class); 
                    startActivity(intent);
                }
                if(yourChose==5)
                {
                    Intent intent = new Intent(MainActivity.this, CalActivity5.class); 
                    startActivity(intent);
                }
            }  
        });  
        sinChosDia.create().show();  
    }  
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        start=(Button) findViewById(R.id.button1);
        start.setOnClickListener(new Button.OnClickListener(){
            
            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                showSinChosDia();
                
            }
        });
        end=(Button) findViewById(R.id.button3);
        end.setOnClickListener(new Button.OnClickListener(){
            
            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                System.exit(0);
            }
        });
    }
   
}
MainActivity
package com.example.szys;

import java.math.*;
import java.util.Random;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

public class CalActivity extends Activity {
    int op;
    int a;
    int b;
    int n=0;
    int w=0;
    String r;
    Double answer,respon;
    TextView textview1,textview2;
    EditText editText;
    Button button;
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.cal_main);
         textview1=(TextView)findViewById(R.id.textView1);
         textview2=(TextView)findViewById(R.id.textView2);
         editText=(EditText)findViewById(R.id.EditText1);
             a =new Random().nextInt(100);
            b =new Random().nextInt(100);
            op=new Random().nextInt(4);
            switch(op)
            {
            case 0:
                textview1.setText(a+"+"+b+"=");
                answer=(double) (a+b);
                break;
            case 1:
                textview1.setText(a+"-"+b+"=");
                answer=(double) (a-b);
                break;
            case 2:
                textview1.setText(a+"*"+b+"=");
                answer=(double) (a*b);
                break;
            case 3:
                while(b==0){
                    b =new Random().nextInt(100);
                }
                textview1.setText(a+"/"+b+"=");
                BigDecimal   x   =   new   BigDecimal((double)a/b);  
                answer  =   x.setScale(2,   BigDecimal.ROUND_HALF_UP).doubleValue();  
                
                break;
            }
            button=(Button)findViewById(R.id.button4);
            button.setOnClickListener(new Button.OnClickListener(){

                @Override
                public void onClick(View arg0) {
                    // TODO Auto-generated method stub
                    respon=Double.parseDouble(editText.getText().toString());
                    r=textview1.getText().toString();
                    editText.setText("");
                    n++;
                    if(respon.equals(answer))
                    {
                        textview2.setText("你答对了！");
                    }
                    else{
                        w++;
                        textview2.setText("你答错了！
"+r+answer);
                    }
                    if(n<5)
                    {
                        a =new Random().nextInt(100);
                        b =new Random().nextInt(100);
                        op=new Random().nextInt(4);
                        switch(op)
                        {
                        case 0:
                            textview1.setText(a+"+"+b+"=");
                            answer=(double) (a+b);
                            break;
                        case 1:
                            textview1.setText(a+"-"+b+"=");
                            answer=(double) (a-b);
                            break;
                        case 2:
                            textview1.setText(a+"*"+b+"=");
                            answer=(double) (a*b);
                            break;
                        case 3:
                            while(b==0){
                                b =new Random().nextInt(100);
                            }
                            textview1.setText(a+"/"+b+"=");
                            BigDecimal   x   =   new   BigDecimal((double)a/b);  
                            answer  =   x.setScale(2,   BigDecimal.ROUND_HALF_UP).doubleValue();  
                            
                            break;
                        }
                    }
                    else
                    {
                        int right=n-w;
                        double rvate=(double)right/n*100;
                        AlertDialog.Builder builder = new AlertDialog.Builder(CalActivity.this);            
                        builder.setTitle("结束");  
                        builder.setMessage("你答对了"+right+"题"+"
"+"答错了"+w+"题"+"
"+"正确率为"+rvate+"%");  
                        builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {  
                            
                            public void onClick(DialogInterface dialog, int whichButton) {  
                                Intent intent = new Intent(CalActivity.this, MainActivity.class); 
                                intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                                startActivity(intent);
                            }  
                        });  
                        builder.create().show();
                    }
                }
                
            });
           
     }
     
}
CalActivity
package com.example.szys;

import java.math.*;
import java.util.Random;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

public class CalActivity2 extends Activity {
    int a;
    int b;
    int n=0;
    int w=0;
    String r;
    Double answer,respon;
    TextView textview1,textview2;
    EditText editText;
    Button button;
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.cal_main);
         textview1=(TextView)findViewById(R.id.textView1);
         textview2=(TextView)findViewById(R.id.textView2);
         editText=(EditText)findViewById(R.id.EditText1);
             a =new Random().nextInt(100);
            b =new Random().nextInt(100);
           
                textview1.setText(a+"+"+b+"=");
                answer=(double) (a+b);
               
            button=(Button)findViewById(R.id.button4);
            button.setOnClickListener(new Button.OnClickListener(){

                @Override
                public void onClick(View arg0) {
                    // TODO Auto-generated method stub
                    respon=Double.parseDouble(editText.getText().toString());
                    r=textview1.getText().toString();
                    editText.setText("");
                    n++;
                    if(respon.equals(answer))
                    {
                        textview2.setText("你答对了！");
                    }
                    else{
                        w++;
                        textview2.setText("你答错了！
"+r+answer);
                    }
                    if(n<5)
                    {
                        a =new Random().nextInt(100);
                        b =new Random().nextInt(100);
                       
                            textview1.setText(a+"+"+b+"=");
                            answer=(double) (a+b);
                           
                    }
                    else
                    {
                        int right=n-w;
                        double rvate=(double)right/n*100;
                        AlertDialog.Builder builder = new AlertDialog.Builder(CalActivity2.this);            
                        builder.setTitle("结束");  
                        builder.setMessage("你答对了"+right+"题"+"
"+"答错了"+w+"题"+"
"+"正确率为"+rvate+"%");  
                        builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {  
                            
                            public void onClick(DialogInterface dialog, int whichButton) {  
                                Intent intent = new Intent(CalActivity2.this, MainActivity.class); 
                                intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                                startActivity(intent);
                            }  
                        });  
                        builder.create().show();
                    }
                }
                
            });

     }
}
CalActivity2
package com.example.szys;

import java.math.*;
import java.util.Random;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

public class CalActivity3 extends Activity {
    
    int a;
    int b;
    int n=0;
    int w=0;
    String r;
    Double answer,respon;
    TextView textview1,textview2;
    EditText editText;
    Button button;
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.cal_main);
         textview1=(TextView)findViewById(R.id.textView1);
         textview2=(TextView)findViewById(R.id.textView2);
         editText=(EditText)findViewById(R.id.EditText1);
             a =new Random().nextInt(100);
            b =new Random().nextInt(100);
           
                textview1.setText(a+"-"+b+"=");
                answer=(double) (a-b);
               
            button=(Button)findViewById(R.id.button4);
            button.setOnClickListener(new Button.OnClickListener(){

                @Override
                public void onClick(View arg0) {
                    // TODO Auto-generated method stub
                    respon=Double.parseDouble(editText.getText().toString());
                    r=textview1.getText().toString();
                    editText.setText("");
                    n++;
                    if(respon.equals(answer))
                    {
                        textview2.setText("你答对了！");
                    }
                    else{
                        w++;
                        textview2.setText("你答错了！
"+r+answer);
                    }
                    if(n<5)
                    {
                        a =new Random().nextInt(100);
                        b =new Random().nextInt(100);
                       
                            textview1.setText(a+"-"+b+"=");
                            answer=(double) (a-b);
                    }
                    else
                    {
                        int right=n-w;
                        double rvate=(double)right/n*100;
                        AlertDialog.Builder builder = new AlertDialog.Builder(CalActivity3.this);            
                        builder.setTitle("结束");  
                        builder.setMessage("你答对了"+right+"题"+"
"+"答错了"+w+"题"+"
"+"正确率为"+rvate+"%");  
                        builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {  
                            
                            public void onClick(DialogInterface dialog, int whichButton) {  
                                Intent intent = new Intent(CalActivity3.this, MainActivity.class); 
                                intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                                startActivity(intent);
                            }  
                        });  
                        builder.create().show();
                    }
                }
                
            });

     }
}
CalActivity3
package com.example.szys;

import java.math.*;
import java.util.Random;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

public class CalActivity4 extends Activity {
    
    int a;
    int b;
    int n=0;
    int w=0;
    String r;
    Double answer,respon;
    TextView textview1,textview2;
    EditText editText;
    Button button;
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.cal_main);
         textview1=(TextView)findViewById(R.id.textView1);
         textview2=(TextView)findViewById(R.id.textView2);
         editText=(EditText)findViewById(R.id.EditText1);
             a =new Random().nextInt(100);
            b =new Random().nextInt(100);
            
                textview1.setText(a+"*"+b+"=");
                answer=(double) (a*b);
               
            button=(Button)findViewById(R.id.button4);
            button.setOnClickListener(new Button.OnClickListener(){

                @Override
                public void onClick(View arg0) {
                    // TODO Auto-generated method stub
                    respon=Double.parseDouble(editText.getText().toString());
                    r=textview1.getText().toString();
                    editText.setText("");
                    n++;
                    if(respon.equals(answer))
                    {
                        textview2.setText("你答对了！");
                    }
                    else{
                        w++;
                        textview2.setText("你答错了！
"+r+answer);
                    }
                    if(n<5)
                    {
                        a =new Random().nextInt(100);
                        b =new Random().nextInt(100);
                       
                            textview1.setText(a+"*"+b+"=");
                            answer=(double) (a*b);
                        
                    }
                    else
                    {
                        int right=n-w;
                        double rvate=(double)right/n*100;
                        AlertDialog.Builder builder = new AlertDialog.Builder(CalActivity4.this);            
                        builder.setTitle("结束");  
                        builder.setMessage("你答对了"+right+"题"+"
"+"答错了"+w+"题"+"
"+"正确率为"+rvate+"%");  
                        builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {  
                            
                            public void onClick(DialogInterface dialog, int whichButton) {  
                                Intent intent = new Intent(CalActivity4.this, MainActivity.class); 
                                intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                                startActivity(intent);
                            }  
                        });  
                        builder.create().show();
                    }
                }
                
            });

     }
}
CalActivity4
package com.example.szys;

import java.math.*;
import java.util.Random;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

public class CalActivity5 extends Activity {
    
    int a;
    int b;
    int n=0;
    int w=0;
    String r;
    Double answer,respon;
    TextView textview1,textview2;
    EditText editText;
    Button button;
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.cal_main);
         textview1=(TextView)findViewById(R.id.textView1);
         textview2=(TextView)findViewById(R.id.textView2);
         editText=(EditText)findViewById(R.id.EditText1);
             a =new Random().nextInt(100);
            b =new Random().nextInt(100);
            
                while(b==0){
                    b =new Random().nextInt(100);
                }
                textview1.setText(a+"/"+b+"=");
                BigDecimal   x   =   new   BigDecimal((double)a/b);  
                answer  =   x.setScale(2,   BigDecimal.ROUND_HALF_UP).doubleValue();  
                
               
            button=(Button)findViewById(R.id.button4);
            button.setOnClickListener(new Button.OnClickListener(){

                @Override
                public void onClick(View arg0) {
                    // TODO Auto-generated method stub
                    respon=Double.parseDouble(editText.getText().toString());
                    r=textview1.getText().toString();
                    editText.setText("");
                    n++;
                    if(respon.equals(answer))
                    {
                        textview2.setText("你答对了！");
                    }
                    else{
                        w++;
                        textview2.setText("你答错了！
"+r+answer);
                    }
                    if(n<5)
                    {
                        a =new Random().nextInt(100);
                        b =new Random().nextInt(100);
                       
                            while(b==0){
                                b =new Random().nextInt(100);
                            }
                            textview1.setText(a+"/"+b+"=");
                            BigDecimal   x   =   new   BigDecimal((double)a/b);  
                            answer  =   x.setScale(2,   BigDecimal.ROUND_HALF_UP).doubleValue();  
                           
                        
                    }
                    else
                    {
                        int right=n-w;
                        double rvate=(double)right/n*100;
                        AlertDialog.Builder builder = new AlertDialog.Builder(CalActivity5.this);            
                        builder.setTitle("结束");  
                        builder.setMessage("你答对了"+right+"题"+"
"+"答错了"+w+"题"+"
"+"正确率为"+rvate+"%");  
                        builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {  
                            
                            public void onClick(DialogInterface dialog, int whichButton) {  
                                Intent intent = new Intent(CalActivity5.this, MainActivity.class); 
                                intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                                startActivity(intent);
                            }  
                        });  
                        builder.create().show();
                    }
                }
                
            });

     }
}
CalActivity5


res--->layout

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/container"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical" 
        android:layout_gravity="center">
        
        <Button
        android:id="@+id/button1"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="开始" />

            <Button
        android:id="@+id/button2"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="历史数据（未进行）" />

            <Button
        android:id="@+id/button3"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="退出" />

    </LinearLayout>

    

</FrameLayout>
activity_main
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <LinearLayout
       android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical" 
        android:layout_gravity="center">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_gravity="center" >

            <TextView
                android:id="@+id/textView1"
                android:layout_width="93dp"
                android:layout_height="wrap_content"
                android:editable="true"
                android:text="" />

            <EditText
                android:id="@+id/EditText1"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:digits="1234567890.-"
                android:ems="10"
                android:numeric="decimal"
                android:text="" >

                <requestFocus />
            </EditText>
        </LinearLayout>

        <Button
        android:id="@+id/button4"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="确定" />

        <TextView
            android:id="@+id/textView2"
            android:layout_width="match_parent"
            android:layout_height="70dp"
            android:editable="true"
            android:text="" />
        
    </LinearLayout>

</LinearLayout>
cal_main

程序截图：

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原文地址：https://www.cnblogs.com/wuzijian/p/4549073.html