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Android studio實(shí)現(xiàn)簡(jiǎn)單的計(jì)算器

 更新時(shí)間：2020年03月31日 15:24:19   作者：一顆暗色星辰  
這篇文章主要為大家詳細(xì)介紹了Android studio實(shí)現(xiàn)簡(jiǎn)單的計(jì)算器，文中示例代碼介紹的非常詳細(xì)，具有一定的參考價(jià)值，感興趣的小伙伴們可以參考一下

本文實(shí)例為大家分享了Android studio實(shí)現(xiàn)簡(jiǎn)單計(jì)算器的具體代碼，供大家參考，具體內(nèi)容如下

需求分析及概要設(shè)計(jì)

目的

開發(fā)一個(gè)簡(jiǎn)單的計(jì)算器App,使之能夠完成加減乘除混合運(yùn)算

工具及環(huán)境

使用java語(yǔ)言，在Android studio平臺(tái)上進(jìn)行開發(fā)

功能設(shè)計(jì)

  • “+”:實(shí)現(xiàn)兩數(shù)相加
  • “-”:實(shí)現(xiàn)兩數(shù)相減
  • “*”:實(shí)現(xiàn)兩數(shù)相乘
  • “/”:實(shí)現(xiàn)兩數(shù)相除
  • “=”:計(jì)算并得出正確結(jié)果
  • “C”:清屏
  • “Backspace”:倒退

設(shè)計(jì)思路

1、首先設(shè)計(jì)一個(gè)可視化的界面，供用戶輸入數(shù)據(jù)并查看結(jié)果。
2、用戶可通過(guò)點(diǎn)擊相應(yīng)按鈕輸入正確的表達(dá)式（注意：這里只實(shí)現(xiàn)對(duì)正確表達(dá)式的計(jì)算處理），最后按"="得出正確結(jié)果。在計(jì)算過(guò)程中可以通過(guò)點(diǎn)擊倒退鍵修改輸入內(nèi)容，在進(jìn)行下一次的運(yùn)算之前必須先進(jìn)行清零操作。
3、設(shè)計(jì)好的計(jì)算器應(yīng)可以進(jìn)行加減乘除混合四則運(yùn)算，且可以進(jìn)行小數(shù)和整數(shù)運(yùn)算

詳細(xì)設(shè)計(jì)

當(dāng)用戶點(diǎn)擊按鈕時(shí)，用SringBuilder變量記錄其輸入的運(yùn)算式，并顯示到文本區(qū)中。

當(dāng)用戶點(diǎn)擊"="時(shí)，把文本區(qū)的運(yùn)算式拿出來(lái)，首先將它內(nèi)部的一個(gè)一個(gè)字節(jié)拼接成獨(dú)立的運(yùn)算數(shù)和運(yùn)算符，然后存儲(chǔ)在一個(gè)ArrayList數(shù)組中，接著再新建兩個(gè)ArrayList數(shù)組，用來(lái)分別存放運(yùn)算數(shù)和運(yùn)算符，然后遍歷存儲(chǔ)運(yùn)算式的ArrayList數(shù)組，把其中的運(yùn)算數(shù)和運(yùn)算符分別放進(jìn)不同的ArrayList中，每一次放置運(yùn)算符時(shí)，都要先和已存在的運(yùn)算符進(jìn)行比較，若要放進(jìn)的運(yùn)算符優(yōu)先級(jí)低于或等于運(yùn)算符數(shù)組中的運(yùn)算符，則彈出一個(gè)運(yùn)算符，并從運(yùn)算數(shù)數(shù)組中彈出兩個(gè)運(yùn)算數(shù)，然后進(jìn)行運(yùn)算，并把結(jié)果送入運(yùn)算數(shù)數(shù)組中，直到遇到比自己優(yōu)先級(jí)低的運(yùn)算符或運(yùn)算符數(shù)組為空時(shí)，則送入該運(yùn)算符。當(dāng)遍歷到運(yùn)算式末尾時(shí)，依次彈出運(yùn)算符中的運(yùn)算符，并對(duì)應(yīng)彈出運(yùn)算數(shù)進(jìn)行運(yùn)算直到運(yùn)算符數(shù)組為空，此時(shí)運(yùn)算數(shù)數(shù)組中只有一個(gè)數(shù)據(jù)就是最終的結(jié)果

代碼

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();//顯示運(yùn)算式
 private ArrayList calculate_equation;//計(jì)算式
 private int signal=0;//為0 時(shí)表示剛輸入狀態(tài)；為1 時(shí)表示當(dāng)前在輸出結(jié)果上繼續(xù)輸入
 @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);
 //點(diǎn)擊文本框時(shí)光標(biāo)始終在文本末尾
 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) {
  //判斷用戶是否輸入了內(nèi)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");
    //跳過(guò)2個(gè)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) {
  //判斷用戶是否輸入了內(nèi)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) {
  //判斷用戶是否輸入了內(nèi)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) {
  //判斷用戶是否輸入了內(nèi)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) {
  //判斷用戶是否輸入了內(nèi)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();
 }
 //相減
 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();
 }
 //當(dāng)API最低版小于21時(shí)使用這個(gè)函數(shù)實(shí)現(xiàn)點(diǎn)擊文本框不彈出鍵盤
 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" >
 <!-- 主體背景顏色值 -->
 <solid android:color="#666666" />
 <!-- 連框?qū)挾群皖伾?-->
 <stroke
 android:width="0.01dp"
 android:color="#FFFFFF" />
</shape>

####結(jié)果分析

啟動(dòng)計(jì)算器并輸入運(yùn)算式“59.0-8/46+2”如下圖：

結(jié)果如下圖：

總結(jié)

這次做計(jì)算器收獲很大，首先我對(duì)Android studio中的布局有了更深刻的認(rèn)識(shí)，其次在這次編程中熟悉了怎么設(shè)置斷點(diǎn)調(diào)試以快速的找出問(wèn)題所在。當(dāng)然，這次的作品也是不夠成熟的，因?yàn)闆](méi)有做有關(guān)錯(cuò)誤表達(dá)式的相應(yīng)處理，因?yàn)闀r(shí)間和精力有限，這次只能先做這么多了

注： 今天沒(méi)事又看了一下這個(gè)代碼，發(fā)現(xiàn)問(wèn)題很多，簡(jiǎn)直是慘不忍睹（希望沒(méi)坑到你們）。比如直接按加、減、乘、除和等號(hào)鍵及后退鍵會(huì)閃退，剛開始一直按 “0” 可以一直輸入0，同一個(gè)數(shù)中可以輸入多個(gè)小數(shù)點(diǎn)等等，我感到很慚愧哈，本人能力有限，不過(guò)還是抽時(shí)間又改了一下，修復(fù)了這些bug，另外也優(yōu)化了一些東西，上面貼的代碼我已經(jīng)更新了，GitHub上的源碼我很快也會(huì)更新的，哪里做的不好也希望大家不吝賜教哈 -2018/11/5

鏈接：源代碼下載地址

更多計(jì)算器功能實(shí)現(xiàn)，請(qǐng)點(diǎn)擊專題： 計(jì)算器功能匯總 進(jìn)行學(xué)習(xí)

關(guān)于Android計(jì)算器功能的實(shí)現(xiàn)，查看專題：Android計(jì)算器 進(jìn)行學(xué)習(xí)。

以上就是本文的全部?jī)?nèi)容，希望對(duì)大家的學(xué)習(xí)有所幫助，也希望大家多多支持腳本之家。

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