Android studio实现简单的计算器

本文实例为大家分享了Android studio实现简单计算器的具体代码，供大家参考，具体内容如下

需求分析及概要设计

目的

开发一个简单的计算器App,使之能够完成加减乘除混合运算

工具及环境

使用java语言，在Android studio平台上进行开发

功能设计

“+”:实现两数相加
“-”:实现两数相减
“*”:实现两数相乘
“/”:实现两数相除
“=”:计算并得出正确结果
“C”:清屏
“Backspace”:倒退

设计思路

1、首先设计一个可视化的界面，供用户输入数据并查看结果。
2、用户可通过点击相应按钮输入正确的表达式（注意：这里只实现对正确表达式的计算处理），最后按\”=\”得出正确结果。在计算过程中可以通过点击倒退键修改输入内容，在进行下一次的运算之前必须先进行清零操作。
3、设计好的计算器应可以进行加减乘除混合四则运算，且可以进行小数和整数运算

详细设计

当用户点击按钮时，用SringBuilder变量记录其输入的运算式，并显示到文本区中。

当用户点击\”=\”时，把文本区的运算式拿出来，首先将它内部的一个一个字节拼接成独立的运算数和运算符，然后存储在一个ArrayList数组中，接着再新建两个ArrayList数组，用来分别存放运算数和运算符，然后遍历存储运算式的ArrayList数组，把其中的运算数和运算符分别放进不同的ArrayList中，每一次放置运算符时，都要先和已存在的运算符进行比较，若要放进的运算符优先级低于或等于运算符数组中的运算符，则弹出一个运算符，并从运算数数组中弹出两个运算数，然后进行运算，并把结果送入运算数数组中，直到遇到比自己优先级低的运算符或运算符数组为空时，则送入该运算符。当遍历到运算式末尾时，依次弹出运算符中的运算符，并对应弹出运算数进行运算直到运算符数组为空，此时运算数数组中只有一个数据就是最终的结果

代码

MainAcivity.java

package com.example.qw.calculator;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import java.lang.reflect.Method;
import java.math.BigDecimal;
import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity{

 private StringBuilder show_equation=new StringBuilder();//显示运算式
 private ArrayList calculate_equation;//计算式
 private int signal=0;//为0 时表示刚输入状态；为1 时表示当前在输出结果上继续输入
 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main);
 //初始化
 show_equation=new StringBuilder();
 calculate_equation=new ArrayList<>();
 Button zero=(Button)findViewById(R.id.zero);
 Button one=(Button)findViewById(R.id.one);
 Button two=(Button)findViewById(R.id.two);
 Button three=(Button)findViewById(R.id.three);
 Button four=(Button)findViewById(R.id.four);
 Button five=(Button)findViewById(R.id.five);
 Button six=(Button)findViewById(R.id.six);
 Button seven=(Button)findViewById(R.id.seven);
 Button eight=(Button)findViewById(R.id.eight);
 Button nine=(Button)findViewById(R.id.nine);
 Button cls=(Button)findViewById(R.id.cls);
 Button div=(Button)findViewById(R.id.div);
 Button mul=(Button)findViewById(R.id.mul);
 Button backspace=(Button)findViewById(R.id.Backspace);
 Button sub=(Button)findViewById(R.id.sub);
 Button add=(Button)findViewById(R.id.add);
 final Button equal=(Button)findViewById(R.id.equal);
 final Button point=(Button)findViewById(R.id.spot);
 final EditText result=(EditText)findViewById(R.id.result);
 result.setCursorVisible(true);
 disableShowInput(result);
 //点击文本框时光标始终在文本末尾
 result.setOnClickListener(new View.OnClickListener() {
  @Override
  public void onClick(View view) {
  result.setSelection(result.getText().length());
  }
 });
 zero.setOnClickListener(new View.OnClickListener() {
  @Override
  public void onClick(View v){
   if(!(show_equation.toString().equals(\"0\"))){
   if(signal==0){
    show_equation.append(\"0\");
    result.setText(show_equation);
    result.setSelection(result.getText().length());
   }else{
    show_equation.delete(0,show_equation.length());
    show_equation.append(\"0\");
    result.setText(show_equation);
    result.setSelection(result.getText().length());
    signal=0;
   }
   }
  }
 });
 one.setOnClickListener(new View.OnClickListener() {
  @Override
  public void onClick(View v) {
  if(signal==0){
   show_equation.append(\"1\");
   result.setText(show_equation);
   result.setSelection(result.getText().length());
  }else{
   show_equation.delete(0,show_equation.length());
   show_equation.append(\"1\");
   result.setText(show_equation);
   result.setSelection(result.getText().length());
   signal=0;
  }
  }
 });
 two.setOnClickListener(new View.OnClickListener() {
  @Override
  public void onClick(View v) {
  if(signal==0){
   show_equation.append(\"2\");
   result.setText(show_equation);
   result.setSelection(result.getText().length());
  }else{
   show_equation.delete(0,show_equation.length());
   show_equation.append(\"2\");
   result.setText(show_equation);
   result.setSelection(result.getText().length());
   signal=0;
  }
  }
 });
 three.setOnClickListener(new View.OnClickListener() {
  @Override
  public void onClick(View v) {
  if(signal==0){
   show_equation.append(\"3\");
   result.setText(show_equation);
   result.setSelection(result.getText().length());
  }else{
   show_equation.delete(0,show_equation.length());
   show_equation.append(\"3\");
   result.setText(show_equation);
   result.setSelection(result.getText().length());
   signal=0;
  }
  }
 });
  four.setOnClickListener(new View.OnClickListener() {
  @Override
  public void onClick(View v) {
  if(signal==0){
   show_equation.append(\"4\");
   result.setText(show_equation);
   result.setSelection(result.getText().length());
  }else{
   show_equation.delete(0,show_equation.length());
   show_equation.append(\"4\");
   result.setText(show_equation);
   result.setSelection(result.getText().length());
   signal=0;
  }
  }
 });
 five.setOnClickListener(new View.OnClickListener() {
  @Override
  public void onClick(View v) {
  if(signal==0){
   show_equation.append(\"5\");
   result.setText(show_equation);
   result.setSelection(result.getText().length());
  }else{
   show_equation.delete(0,show_equation.length());
   show_equation.append(\"5\");
   result.setText(show_equation);
   result.setSelection(result.getText().length());
   signal=0;
  }
  }
 });
 six.setOnClickListener(new View.OnClickListener() {
  @Override
  public void onClick(View v) {
  if(signal==0){
   show_equation.append(\"6\");
   result.setText(show_equation);
   result.setSelection(result.getText().length());
  }else{
   show_equation.delete(0,show_equation.length());
   show_equation.append(\"6\");
   result.setText(show_equation);
   result.setSelection(result.getText().length());
   signal=0;
  }
  }
 });
 seven.setOnClickListener(new View.OnClickListener() {
  @Override
  public void onClick(View v) {
  if(signal==0){
   show_equation.append(\"7\");
   result.setText(show_equation);
   result.setSelection(result.getText().length());
  }else{
   show_equation.delete(0,show_equation.length());
   show_equation.append(\"7\");
   result.setText(show_equation);
   result.setSelection(result.getText().length());
   signal=0;
  }
  }
 });
 eight.setOnClickListener(new View.OnClickListener() {
  @Override
  public void onClick(View v) {
  if(signal==0){
   show_equation.append(\"8\");
   result.setText(show_equation);
   result.setSelection(result.getText().length());
  }else{
   show_equation.delete(0,show_equation.length());
   show_equation.append(\"8\");
   result.setText(show_equation);
   result.setSelection(result.getText().length());
   signal=0;
  }
  }
 });
 nine.setOnClickListener(new View.OnClickListener() {
  @Override
  public void onClick(View v) {
  if(signal==0){
   show_equation.append(\"9\");
   result.setText(show_equation);
   result.setSelection(result.getText().length());
  }else{
   show_equation.delete(0,show_equation.length());
   show_equation.append(\"9\");
   result.setText(show_equation);
   result.setSelection(result.getText().length());
   signal=0;
  }
  }
 });
 cls.setOnClickListener(new View.OnClickListener() {
  @Override
  public void onClick(View v) {
  show_equation.delete(0,show_equation.length());
  calculate_equation.clear();
  signal=0;
  result.setText(\"\");
  }
 });
 backspace.setOnClickListener(new View.OnClickListener() {
  @Override
  public void onClick(View v) {
  if(!(show_equation.toString().equals(\"\"))) {
   if(signal==0){
   show_equation.deleteCharAt(show_equation.length() - 1);
   result.setText(show_equation);
   result.setSelection(result.getText().length());
   }else{
   show_equation.delete(0,show_equation.length());
   result.setText(\"\");
   signal=0;
   }
  }
  }
 });
 point.setOnClickListener(new View.OnClickListener() {
  @Override
  public void onClick(View v) {
  if(signal==0){
   String a=show_equation.toString();
   if(a.equals(\"\")){
   show_equation.append(\".\");
   result.setText(show_equation);
   result.setSelection(result.getText().length());
   }else{
   int i;
   char t=\'0\';
   for(i=a.length();i>0;i--){
    t=a.charAt(i-1);
    if(t==\'.\'||t==\'+\'||t==\'-\'||t==\'*\'||t==\'/\')
    break;
   }
   if(i==0){
    show_equation.append(\".\");
    result.setText(show_equation);
    result.setSelection(result.getText().length());
   }else if(t==\'+\'||t==\'-\'||t==\'*\'||t==\'/\'){
    show_equation.append(\".\");
    result.setText(show_equation);
    result.setSelection(result.getText().length());
   }
   }
  }else{
   show_equation.delete(0,show_equation.length());
   show_equation.append(\".\");
   result.setText(\".\");
   result.setSelection(result.getText().length());
   signal=0;
  }
  }
 });

 equal.setOnClickListener(new View.OnClickListener() {
  @Override
  public void onClick(View v) {
  //判断用户是否输入了内容
  if(!show_equation.toString().equals(\"\")){
   signal=1;
   char temp=show_equation.charAt(show_equation.length()-1);
   if(show_equation.charAt(0)==\'-\')
   show_equation.insert(0,\"0\");
   if(temp==\'+\'||temp==\'-\')
   show_equation.append(\"0\");
   if(temp==\'*\'||temp==\'/\')
   show_equation.append(\"1\");
   StringBuilder temp1=new StringBuilder();
   for(int i=0;i<show_equation.length();i++){
   if(show_equation.charAt(i)>=\'0\'&&show_equation.charAt(i)<=\'9\'||show_equation.charAt(i)==\'.\'){
    temp1.append(String.valueOf(show_equation.charAt(i)));
   }else if(show_equation.charAt(i)==\'N\'){
    calculate_equation.add(\"NaN\");
    //跳过2个字符
    i=i+2;
   }else if(show_equation.charAt(i)==\'∞\'){
    calculate_equation.add(\"∞\");
   }
   else
   {
    if(temp1.length()!=0){
    calculate_equation.add(temp1.toString());
    temp1.delete(0,temp1.length());
    }
    calculate_equation.add(String.valueOf(show_equation.charAt(i)));
   }
   }
   if(temp1.length()!=0){
   calculate_equation.add(temp1.toString());
   }
   calculate_equation.add(\"#\");
   String temp8=calculate(calculate_equation);
   result.setText(temp8);
   result.setSelection(result.getText().length());
   show_equation.delete(0,show_equation.length());
   calculate_equation.clear();
   show_equation.append(temp8);
  }
  }
 });
 add.setOnClickListener(new View.OnClickListener() {
  @Override
  public void onClick(View v) {
  //判断用户是否输入了内容
  if(!(show_equation.toString().equals(\"\"))) {
   signal=0;
   char temp=show_equation.charAt(show_equation.length()-1);
   if(temp==\'+\'||temp==\'-\'||temp==\'*\'||temp==\'/\')
   {
   show_equation.deleteCharAt(show_equation.length()-1);
   show_equation.append(\"+\");
   }
   else
   show_equation.append(\"+\");
   result.setText(show_equation);
   result.setSelection(result.getText().length());
  }
  }
 });
 sub.setOnClickListener(new View.OnClickListener() {
  @Override
  public void onClick(View v) {
  //判断用户是否输入了内容
  if(!(show_equation.toString().equals(\"\"))) {
   signal=0;
   char temp=show_equation.charAt(show_equation.length()-1);
   if(temp==\'+\'||temp==\'-\'||temp==\'*\'||temp==\'/\')
   {
   show_equation.deleteCharAt(show_equation.length()-1);
   show_equation.append(\"-\");
   }
   else
   show_equation.append(\"-\");
   result.setText(show_equation);
   result.setSelection(result.getText().length());
  }
  }
 });

 mul.setOnClickListener(new View.OnClickListener() {
  @Override
  public void onClick(View v) {
  //判断用户是否输入了内容
  if(!(show_equation.toString().equals(\"\"))) {
   signal=0;
   char temp=show_equation.charAt(show_equation.length()-1);
   if(temp==\'+\'||temp==\'-\'||temp==\'*\'||temp==\'/\')
   {
   show_equation.deleteCharAt(show_equation.length()-1);
   show_equation.append(\"*\");
   }
   else
   show_equation.append(\"*\");
   result.setText(show_equation);
   result.setSelection(result.getText().length());
  }
  }
 });

 div.setOnClickListener(new View.OnClickListener() {
  @Override
  public void onClick(View v) {
  //判断用户是否输入了内容
  if(!(show_equation.toString().equals(\"\"))) {
   signal=0;
   char temp=show_equation.charAt(show_equation.length()-1);
   if(temp==\'+\'||temp==\'-\'||temp==\'*\'||temp==\'/\')
   {
   show_equation.deleteCharAt(show_equation.length()-1);
   show_equation.append(\"/\");
   }
   else
   show_equation.append(\"/\");
   result.setText(show_equation);
   result.setSelection(result.getText().length());
  }
  }
 });
 }
 protected boolean operatorPriorityCompare(char operator1,char operator2)
 {
 int o1=0;
 int o2=0;
 switch (operator1){
  case \'+\':{o1=0;break;}
  case \'-\':{o1=0;break;}
  case \'*\':{o1=1;break;}
  case \'/\':{o1=1;break;}
 }
 switch (operator2){
  case \'+\':{o2=0;break;}
  case \'-\':{o2=0;break;}
  case \'*\':{o2=1;break;}
  case \'/\':{o2=1;break;}
 }
 if(o1<=o2)
 {
  return false;
 }
 else
  return true;
 }
 //相加
 public static Double Add(Double d1,Double d2) {
 if(d1==Double.NEGATIVE_INFINITY||d1==Double.POSITIVE_INFINITY||d2==Double.NEGATIVE_INFINITY||d2==Double.POSITIVE_INFINITY){
  return d1+d2;
 }
 if(String.valueOf(d1).equals(\"NaN\")||String.valueOf(d1).equals(\"NaN\")){
  return d1+d2;
 }
 BigDecimal b1 = new BigDecimal(Double.toString(d1));
 BigDecimal b2 = new BigDecimal(Double.toString(d2));
 return b1.add(b2).doubleValue();
 }
 //相减
 public static Double Sub(Double d1,Double d2){
 if(d1==Double.NEGATIVE_INFINITY||d1==Double.POSITIVE_INFINITY||d2==Double.NEGATIVE_INFINITY||d2==Double.POSITIVE_INFINITY){
  return d1-d2;
 }
 if(String.valueOf(d1).equals(\"NaN\")||String.valueOf(d1).equals(\"NaN\")){
  return d1-d2;
 }
 if(String.valueOf(d1).equals(\"NaN\")||String.valueOf(d1).equals(\"NaN\")){
  return d1*d2;
 }
 BigDecimal b1=new BigDecimal(Double.toString(d1));
 BigDecimal b2=new BigDecimal(Double.toString(d2));
 return b1.subtract(b2).doubleValue();
 }
 //相乘
 public static Double Mul(Double d1,Double d2){
 if(d1==Double.NEGATIVE_INFINITY||d1==Double.POSITIVE_INFINITY||d2==Double.NEGATIVE_INFINITY||d2==Double.POSITIVE_INFINITY){
  return d1*d2;
 }
 if(String.valueOf(d1).equals(\"NaN\")||String.valueOf(d1).equals(\"NaN\")){
  return d1*d2;
 }
 BigDecimal b1=new BigDecimal(Double.toString(d1));
 BigDecimal b2=new BigDecimal(Double.toString(d2));
 return b1.multiply(b2).setScale(8).doubleValue();
 }
 //相除
 public static Double Div(Double d1,Double d2){
 if(d1==Double.NEGATIVE_INFINITY||d1==Double.POSITIVE_INFINITY||d2==Double.NEGATIVE_INFINITY||d2==Double.POSITIVE_INFINITY){
  return d1/d2;
 }
 if(String.valueOf(d1).equals(\"NaN\")||String.valueOf(d1).equals(\"NaN\")){
  return d1/d2;
 }
 if(d1==0.0&&d2==0.0){
  return Double.NaN;
 }
 if(d2==0.0){
  return d1/d2;
 }
 BigDecimal b1=new BigDecimal(Double.toString(d1));
 BigDecimal b2=new BigDecimal(Double.toString(d2));
 return b1.divide(b2,8,BigDecimal.ROUND_HALF_UP).doubleValue();
 }
 protected String calculate(ArrayList equation){
 Double temp2;
 Double temp3;
 Double result;
 List operator=new ArrayList();
 List<Double> operand=new ArrayList();
 for(int i=0;i<equation.size();i++)
 {
  String temp4=(String) equation.get(i);
  if(temp4.equals(\"+\")||temp4.equals(\"-\")||temp4.equals(\"*\")||temp4.equals(\"/\"))
  {
  if(operator.size()>0)
  {
   String temp5=operator.get(operator.size()-1).toString();
   while(!(operatorPriorityCompare(temp4.charAt(0),temp5.charAt(0)))&&operator.size()>0)
   {
   operator.remove(operator.size()-1);
   temp3=operand.get(operand.size()-1);
   operand.remove(operand.size()-1);
   temp2=operand.get(operand.size()-1);
   operand.remove(operand.size()-1);
   switch (temp5.charAt(0)){
    case \'+\':{result=Add(temp2,temp3);operand.add(result);break;}
    case \'-\':{result=Sub(temp2,temp3);operand.add(result);break;}
    case \'*\':{result=Mul(temp2,temp3);operand.add(result);break;}
    case \'/\':{result=Div(temp2,temp3);operand.add(result);break;}
   }
   if(operator.size()>0)
   {
    temp5=operator.get(operator.size()-1).toString();
   }
   else
    break;
   }
   operator.add(temp4);
  }
  else
   operator.add(temp4);
  }
  else if(temp4.equals(\"#\"))
  {
  while(operator.size()>0)
  {
   String temp6=(String)operator.get(operator.size()-1);
   operator.remove(operator.size()-1);
   temp3=operand.get(operand.size()-1);
   operand.remove(operand.size()-1);
   temp2=operand.get(operand.size()-1);
   operand.remove(operand.size()-1);
   switch (temp6.charAt(0)){
   case \'+\':{result=Add(temp2,temp3);operand.add(result);break;}
   case \'-\':{result=Sub(temp2,temp3);operand.add(result);break;}
   case \'*\':{result=Mul(temp2,temp3);operand.add(result);break;}
   case \'/\':{result=Div(temp2,temp3);operand.add(result);break;}
   }
  }
  }
  else
  {
  if(temp4.equals(\"NaN\")){
   operand.add(Double.NaN);
  }else if(temp4.equals(\"∞\")){
   operand.add(Double.POSITIVE_INFINITY);
  }else{
   operand.add(Double.parseDouble(temp4));
  }
  }
 }
 if(operand.get(0)==Double.NEGATIVE_INFINITY) return \"-∞\";
 if(operand.get(0)==Double.POSITIVE_INFINITY) return \"∞\";
 return operand.get(0).toString();
 }
 //当API最低版小于21时使用这个函数实现点击文本框不弹出键盘
 public void disableShowInput(EditText et) {
 Class<EditText> cls = EditText.class;
 Method method;
 try {
  method = cls.getMethod(\"setShowSoftInputOnFocus\", boolean.class);
  method.setAccessible(true);
  method.invoke(et, false);
 } catch (Exception e) {
  e.printStackTrace();
 }
 }
}

activity_main.xml

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

 <EditText
 android:id=\"@+id/result\"
 android:layout_width=\"match_parent\"
 android:layout_height=\"wrap_content\"
 android:textSize=\"40sp\"
 android:enabled=\"false\"/>
 <LinearLayout
 android:layout_width=\"match_parent\"
 android:layout_height=\"0dp\"
 android:layout_weight=\"1\"
 android:orientation=\"horizontal\">

 <Button
  android:id=\"@+id/cls\"
  android:layout_width=\"0dp\"
  android:layout_height=\"match_parent\"
  android:layout_weight=\"1\"
  android:textSize=\"20sp\"
  android:text=\"C\"
  android:background=\"@drawable/buttonstytle\"
  android:textColor=\"#ffffff\"/>
 <Button
  android:id=\"@+id/div\"
  android:layout_width=\"0dp\"
  android:layout_height=\"match_parent\"
  android:layout_weight=\"1\"
  android:textSize=\"20sp\"
  android:text=\"/\"
  android:background=\"@drawable/buttonstytle\"
  android:textColor=\"#ffffff\"/>
 <Button
  android:id=\"@+id/mul\"
  android:layout_width=\"0dp\"
  android:layout_height=\"match_parent\"
  android:layout_weight=\"1\"
  android:textSize=\"20sp\"
  android:text=\"*\"
  android:background=\"@drawable/buttonstytle\"
  android:textColor=\"#ffffff\"/>
 <Button
  android:id=\"@+id/Backspace\"
  android:layout_width=\"0dp\"
  android:layout_height=\"match_parent\"
  android:layout_weight=\"1\"
  android:textSize=\"20sp\"
  android:text=\"Backspace\"
  android:textAllCaps=\"false\"
  android:background=\"@drawable/buttonstytle\"
  android:textColor=\"#ffffff\"/>
 </LinearLayout>

 <LinearLayout
 android:layout_width=\"match_parent\"
 android:layout_height=\"0dp\"
 android:layout_weight=\"1\"
 android:orientation=\"horizontal\">

 <Button
  android:id=\"@+id/seven\"
  android:layout_width=\"0dp\"
  android:layout_height=\"match_parent\"
  android:layout_weight=\"1\"
  android:textSize=\"20sp\"
  android:text=\"7\"
  android:background=\"@drawable/buttonstytle\"
  android:textColor=\"#ffffff\"/>
 <Button
  android:id=\"@+id/eight\"
  android:layout_width=\"0dp\"
  android:layout_height=\"match_parent\"
  android:layout_weight=\"1\"
  android:textSize=\"20sp\"
  android:text=\"8\"
  android:background=\"@drawable/buttonstytle\"
  android:textColor=\"#ffffff\"/>
 <Button
  android:id=\"@+id/nine\"
  android:layout_width=\"0dp\"
  android:layout_height=\"match_parent\"
  android:layout_weight=\"1\"
  android:textSize=\"20sp\"
  android:text=\"9\"
  android:background=\"@drawable/buttonstytle\"
  android:textColor=\"#ffffff\"/>
 <Button
  android:id=\"@+id/sub\"
  android:layout_width=\"0dp\"
  android:layout_height=\"match_parent\"
  android:layout_weight=\"1\"
  android:textSize=\"20sp\"
  android:text=\"-\"
  android:background=\"@drawable/buttonstytle\"
  android:textColor=\"#ffffff\"/>
 </LinearLayout>

 <LinearLayout
 android:layout_width=\"match_parent\"
 android:layout_height=\"0dp\"
 android:layout_weight=\"1\"
 android:orientation=\"horizontal\">

 <Button
  android:id=\"@+id/four\"
  android:layout_width=\"0dp\"
  android:layout_height=\"match_parent\"
  android:layout_weight=\"1\"
  android:textSize=\"20sp\"
  android:text=\"4\"
  android:background=\"@drawable/buttonstytle\"
  android:textColor=\"#ffffff\"/>
 <Button
  android:id=\"@+id/five\"
  android:layout_width=\"0dp\"
  android:layout_height=\"match_parent\"
  android:layout_weight=\"1\"
  android:textSize=\"20sp\"
  android:text=\"5\"
  android:background=\"@drawable/buttonstytle\"
  android:textColor=\"#ffffff\"/>
 <Button
  android:id=\"@+id/six\"
  android:layout_width=\"0dp\"
  android:layout_height=\"match_parent\"
  android:layout_weight=\"1\"
  android:textSize=\"20sp\"
  android:text=\"6\"
  android:background=\"@drawable/buttonstytle\"
  android:textColor=\"#ffffff\"/>
 <Button
  android:id=\"@+id/add\"
  android:layout_width=\"0dp\"
  android:layout_height=\"match_parent\"
  android:layout_weight=\"1\"
  android:textSize=\"20sp\"
  android:text=\"+\"
  android:background=\"@drawable/buttonstytle\"
  android:textColor=\"#ffffff\"/>
 </LinearLayout>

 <LinearLayout
 android:layout_width=\"match_parent\"
 android:layout_height=\"0dp\"
 android:layout_weight=\"2\"
 android:orientation=\"horizontal\">

 <LinearLayout
  android:layout_width=\"0dp\"
  android:layout_height=\"match_parent\"
  android:layout_weight=\"1\"
  android:orientation=\"vertical\">

  <LinearLayout
  android:layout_width=\"match_parent\"
  android:layout_height=\"1dp\"
  android:layout_weight=\"1\"
  android:orientation=\"horizontal\">
  <Button
   android:id=\"@+id/one\"
   android:layout_width=\"0dp\"
   android:layout_height=\"match_parent\"
   android:layout_weight=\"1\"
   android:textSize=\"20sp\"
   android:text=\"1\"
   android:background=\"@drawable/buttonstytle\"
   android:textColor=\"#ffffff\"/>
  <Button
   android:id=\"@+id/two\"
   android:layout_width=\"0dp\"
   android:layout_height=\"match_parent\"
   android:layout_weight=\"1\"
   android:textSize=\"20sp\"
   android:text=\"2\"
   android:background=\"@drawable/buttonstytle\"
   android:textColor=\"#ffffff\"/>
  </LinearLayout>
  <LinearLayout
  android:layout_width=\"match_parent\"
  android:layout_height=\"1dp\"
  android:layout_weight=\"1\">
  <Button
   android:id=\"@+id/zero\"
   android:layout_width=\"match_parent\"
   android:layout_height=\"match_parent\"
   android:text=\"0\"
   android:textSize=\"20sp\"
   android:background=\"@drawable/buttonstytle\"
   android:textColor=\"#ffffff\"/>
  </LinearLayout>
 </LinearLayout>
 <LinearLayout
  android:layout_width=\"0dp\"
  android:layout_height=\"match_parent\"
  android:layout_weight=\"1\"
  android:orientation=\"horizontal\">
  <LinearLayout
  android:layout_width=\"0dp\"
  android:layout_height=\"match_parent\"
  android:layout_weight=\"1\"
  android:orientation=\"vertical\">
  <Button
   android:id=\"@+id/three\"
   android:layout_width=\"match_parent\"
   android:layout_height=\"1dp\"
   android:layout_weight=\"1\"
   android:text=\"3\"
   android:textSize=\"20sp\"
   android:background=\"@drawable/buttonstytle\"
   android:textColor=\"#ffffff\"/>
  <Button
   android:id=\"@+id/spot\"
   android:layout_width=\"match_parent\"
   android:layout_height=\"1dp\"
   android:layout_weight=\"1\"
   android:text=\".\"
   android:textSize=\"20sp\"
   android:background=\"@drawable/buttonstytle\"
   android:textColor=\"#ffffff\"/>
  </LinearLayout>
  <LinearLayout
  android:layout_width=\"0dp\"
  android:layout_height=\"match_parent\"
  android:layout_weight=\"1\">
  <Button
   android:id=\"@+id/equal\"
   android:layout_width=\"match_parent\"
   android:layout_height=\"match_parent\"
   android:text=\"=\"
   android:textSize=\"20sp\"
   android:background=\"@drawable/buttonstytle\"
   android:textColor=\"#ffffff\"/>
  </LinearLayout>
 </LinearLayout>
</LinearLayout>
</LinearLayout>

buttonstytle.xml

<?xml version=\"1.0\" encoding=\"utf-8\"?>
<shape xmlns:android=\"http://schemas.android.com/apk/res/android\" >
 <!-- 主体背景颜色值 -->
 <solid android:color=\"#666666\" />
 <!-- 连框宽度和颜色值 -->
 <stroke
 android:width=\"0.01dp\"
 android:color=\"#FFFFFF\" />
</shape>

####结果分析

启动计算器并输入运算式“59.0-8/46+2”如下图：

结果如下图：

总结

这次做计算器收获很大，首先我对Android studio中的布局有了更深刻的认识，其次在这次编程中熟悉了怎么设置断点调试以快速的找出问题所在。当然，这次的作品也是不够成熟的，因为没有做有关错误表达式的相应处理，因为时间和精力有限，这次只能先做这么多了

注：今天没事又看了一下这个代码，发现问题很多，简直是惨不忍睹（希望没坑到你们）。比如直接按加、减、乘、除和等号键及后退键会闪退，刚开始一直按 “0” 可以一直输入0，同一个数中可以输入多个小数点等等，我感到很惭愧哈，本人能力有限，不过还是抽时间又改了一下，修复了这些bug，另外也优化了一些东西，上面贴的代码我已经更新了，GitHub上的源码我很快也会更新的，哪里做的不好也希望大家不吝赐教哈 -2018/11/5

链接：源代码下载地址

更多计算器功能实现，请点击专题：计算器功能汇总进行学习

关于Android计算器功能的实现，查看专题：Android计算器进行学习。

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