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androidstudio实现简单的计算器(无bug)

这篇文章主要为大家详细介绍了androidstudio实现简单计算器,文中示例代码介绍的非常详细,具有一定的参考价值,感兴趣的小伙伴们可以参考一下

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

1.效果图

2布局代码

<&#63;xml version="1.0" encoding="utf-8"&#63;>

 
 
 
 
 
 
 

3.逻辑代码

package com.example.myzhuoye;

import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;

import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;

public class JiSuanJi extends AppCompatActivity implements View.OnClickListener {
 //结果
 private EditText ET001,ET002;
 //数字0-9
 private Button btn0018, btn0013,btn0014,btn0015,btn009,btn0010,btn0011,btn005,btn006,btn007;
 //运算符,+,-,×,÷,.,=;清除,返回
 private Button btn0012,btn008,btn003,btn002,btn0019,btn0016,btn001,btn004;
 private String text = "";//保存输入的数字和符号
 private Double result = 0.0;//输出结果


 @Override
 protected void onCreate(@Nullable Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.layout4);
 //结果
 ET001=(EditText)findViewById(R.id.ET001);
 ET002=(EditText)findViewById(R.id.ET002);
 //数字0-9
 btn0013=(Button)findViewById(R.id.btn0013);
 btn0014=(Button)findViewById(R.id.btn0014);
 btn0015=(Button)findViewById(R.id.btn0015);
 btn009=(Button)findViewById(R.id.btn009);
 btn0010=(Button)findViewById(R.id.btn0010);
 btn0011=(Button)findViewById(R.id.btn0011);
 btn005=(Button)findViewById(R.id.btn005);
 btn006=(Button)findViewById(R.id.btn006);
 btn007=(Button)findViewById(R.id.btn007);
 btn0018=(Button)findViewById(R.id.btn0018);
 //运算符
 btn004=(Button)findViewById(R.id.btn004);
 btn0012=(Button)findViewById(R.id.btn0012);
 btn008=(Button)findViewById(R.id.btn008);
 btn003=(Button)findViewById(R.id.btn003);
 btn002=(Button)findViewById(R.id.btn002);
 btn0019=(Button)findViewById(R.id.btn0019);
 btn0016=(Button)findViewById(R.id.btn0016);
 btn001=(Button)findViewById(R.id.btn001);
 //添加点击事件
 btn0013.setOnClickListener((View.OnClickListener) this);
 btn0014.setOnClickListener((View.OnClickListener) this);
 btn0015.setOnClickListener((View.OnClickListener) this);
 btn009.setOnClickListener((View.OnClickListener) this);
 btn0010.setOnClickListener((View.OnClickListener) this);

 btn0011.setOnClickListener((View.OnClickListener) this);
 btn005.setOnClickListener((View.OnClickListener) this);
 btn006.setOnClickListener((View.OnClickListener) this);
 btn007.setOnClickListener((View.OnClickListener) this);
 btn0018.setOnClickListener((View.OnClickListener) this);

 btn0012.setOnClickListener((View.OnClickListener) this);
 btn008.setOnClickListener((View.OnClickListener) this);
 btn003.setOnClickListener((View.OnClickListener) this);
 btn002.setOnClickListener((View.OnClickListener) this);
 btn0019.setOnClickListener((View.OnClickListener) this);

 btn0016.setOnClickListener((View.OnClickListener) this);
 btn001.setOnClickListener((View.OnClickListener) this);
 btn004.setOnClickListener((View.OnClickListener) this);
 }

 @Override
 public void onClick(View v) {
 String string=ET001.getText().toString();
 switch (v.getId()){
  case R.id.btn0018://0
  num(0);
  break;
  case R.id.btn0013://1
  num(1);
  break;
  case R.id.btn0014://2
  num(2);
  break;
  case R.id.btn0015://3
  num(3);
  break;
  case R.id.btn009://4
  num(4);
  break;
  case R.id.btn0010://5
  num(5);
  break;
  case R.id.btn0011://6
  num(6);
  break;
  case R.id.btn005://7
  num(7);
  break;
  case R.id.btn006://8
  num(8);
  break;
  case R.id.btn007://9
  num(9);
  break;
  case R.id.btn0019://.
  dot();
  break;
  case R.id.btn0012://+
  add();
  break;
  case R.id.btn008://-
  sub();
  break;
  case R.id.btn003://"*"
  multiply();
  break;
  case R.id.btn002://除
  divide();
  break;
  case R.id.btn001://清除
  clear();
  break;
  case R.id.btn004://返回
  back();
  break;
  //计算结果
  case R.id.btn0016://结果
  result();
  break;
  default:
  break;
 }
 ET001.setText(text);
 ET002.setText(String.valueOf(result));
 }
 private void num(int i) {
 text = text + String.valueOf(i);
 }

 private void dot() {

 int a=text.length();
 String s01="+";
 String s02="-";
 String s03="×";
 String s04="÷";
 String s05=".";
 if (a!=0) {
  String s=text.substring(a-1,a);
  String s0=text.substring(0,a-1);
  if (s01.equals(s) || s02.equals(s) || s03.equals(s) || s04.equals(s) || s05.equals(s)) {
  text = s0+".";
  }else {
  text += ".";
  }
 } else {
  text = "";
  result =0.0;
  ET001.setText("");
  ET002.setText("");
 }
 }

 private void clear() {

 text = "";
 result =0.0;
 ET001.setText("");
 ET002.setText("");

 }

 private void back() {
 if (text.length()!=0){
  String str = text.substring(0, text.length()-1);
  text = str;
 }

 ;

 }

 private void add() {
 int a=text.length();

 String s01="+";
 String s02="-";
 String s03="×";
 String s04="÷";
 String s05=".";
 if (a!=0) {
  String s=text.substring(a-1,a);
  String s0=text.substring(0,a-1);
  if (s01.equals(s) || s02.equals(s) || s03.equals(s) || s04.equals(s) || s05.equals(s)) {
  text = s0+"+";
  }else {
  text += "+";
  }
 } else {
  text = "";
  result =0.0;
  ET001.setText("");
  ET002.setText("");
 }

 }

 private void sub() {
 int a=text.length();
 String s01="+";
 String s02="-";
 String s03="×";
 String s04="÷";
 String s05=".";
 if (a!=0) {
  String s=text.substring(a-1,a);
  String s0=text.substring(0,a-1);
  if (s01.equals(s) || s02.equals(s) || s03.equals(s) || s04.equals(s) || s05.equals(s)) {
  text = s0+"-";
  }else {
  text += "-";
  }
 } else {
  text = "";
  result =0.0;
  ET001.setText("");
  ET002.setText("");
 }

 }

 private void multiply() {

 int a=text.length();
 String s01="+";
 String s02="-";
 String s03="×";
 String s04="÷";
 String s05=".";
 if (a!=0) {
  String s=text.substring(a-1,a);
  String s0=text.substring(0,a-1);
  if (s01.equals(s) || s02.equals(s) || s03.equals(s) || s04.equals(s) || s05.equals(s)) {
  text = s0+"×";
  }else {
  text += "×";
  }
 } else {
  text = "";
  result =0.0;
  ET001.setText("");
  ET002.setText("");
 }

 }

 private void divide() {

 int a=text.length();
 String s01="+";
 String s02="-";
 String s03="×";
 String s04="÷";
 String s05=".";
 if (a!=0) {
  String s=text.substring(a-1,a);
  String s0=text.substring(0,a-1);
  if (s01.equals(s) || s02.equals(s) || s03.equals(s) || s04.equals(s) || s05.equals(s)) {
  text = s0+"÷";
  }else {
  text += "÷";
  }
 } else {
  text = "";
  result =0.0;
  ET001.setText("");
  ET002.setText("");
 }
 }

 //计算输出结果
 private void result() {
 result = testOperation(text);
 }


 public Double testOperation(String s){
 //分割字符然后放进数组
 String s1 =s.replace("+","-");
 String[] str = s1.split("-");
 double total1=0;
 //先遍历数组,把里面的乘除结果算出来
 for(String str1:str){
  if(str1.contains("×")||str1.contains("÷")){
  double total = 0;
  for(int i =0;i

4.XML文件

<&#63;xml version="1.0" encoding="utf-8"&#63;>

 
 
 
 
 
<&#63;xml version="1.0" encoding="utf-8"&#63;>







关于计算器的精彩文章请查看《计算器专题》 ,更多精彩等你来发现!

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