android studio实现简单的计算器（无bug）

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

<?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\"
 android:background=\"@drawable/jsj1\">
 <TextView
 android:layout_width=\"match_parent\"
 android:layout_height=\"wrap_content\"
 android:text=\"计算器\"
 android:textSize=\"20dp\"
 android:gravity=\"center\"
 android:textColor=\"#EE4000\"/>
 <TextView
 android:layout_width=\"match_parent\"
 android:layout_height=\"wrap_content\"
 android:text=\"输入数字\"/>
 <EditText
 android:id=\"@+id/ET001\"
 android:layout_width=\"match_parent\"
 android:layout_height=\"wrap_content\"/>
 <TextView
 android:layout_width=\"match_parent\"
 android:layout_height=\"wrap_content\"
 android:text=\"运算结果\"/>
 <EditText
 android:id=\"@+id/ET002\"
 android:layout_width=\"match_parent\"
 android:layout_height=\"wrap_content\"/>
 <LinearLayout
 android:layout_width=\"match_parent\"
 android:layout_height=\"wrap_content\"
 android:orientation=\"horizontal\">
 <Button
  android:layout_marginLeft=\"5dp\"
  android:id=\"@+id/btn001\"
  android:layout_width=\"88dp\"
  android:layout_height=\"100dp\"
  android:text=\"C\"
  android:textSize=\"20dp\"
  android:padding=\"5dp\"
  android:background=\"@drawable/qqqqqqqqqq\"/>
 <Button
  android:id=\"@+id/btn002\"
  android:layout_width=\"88dp\"
  android:layout_height=\"100dp\"
  android:text=\"÷\"
  android:textSize=\"20dp\"
  android:padding=\"5dp\"
  android:background=\"@drawable/qqqqqqqqqq\"/>

 <Button
  android:id=\"@+id/btn003\"
  android:layout_width=\"88dp\"
  android:layout_height=\"100dp\"
  android:text=\"×\"
  android:textSize=\"20dp\"
  android:padding=\"5dp\"
  android:background=\"@drawable/qqqqqqqqqq\"/>
 <Button
  android:id=\"@+id/btn004\"
  android:layout_width=\"88dp\"
  android:layout_height=\"100dp\"
  android:text=\"Cx\"
  android:textSize=\"20dp\"
  android:padding=\"5dp\"
  android:background=\"@drawable/qqqqqqqqqq\"/>

 </LinearLayout>
 <LinearLayout
 android:layout_width=\"match_parent\"
 android:layout_height=\"wrap_content\"
 android:orientation=\"horizontal\">
 <Button
  android:layout_marginLeft=\"5dp\"
  android:id=\"@+id/btn005\"
  android:layout_width=\"88dp\"
  android:layout_height=\"100dp\"
  android:text=\"7\"
  android:textSize=\"20dp\"
  android:padding=\"5dp\"
  android:background=\"@drawable/sssssssssssssss\"/>
 <Button
  android:id=\"@+id/btn006\"
  android:layout_width=\"88dp\"
  android:layout_height=\"100dp\"
  android:text=\"8\"
  android:textSize=\"20dp\"
  android:padding=\"5dp\"
  android:background=\"@drawable/sssssssssssssss\"/>
 <Button
  android:id=\"@+id/btn007\"
  android:layout_width=\"88dp\"
  android:layout_height=\"100dp\"
  android:text=\"9\"
  android:textSize=\"20dp\"
  android:padding=\"5dp\"
  android:background=\"@drawable/sssssssssssssss\"/>
 <Button
  android:id=\"@+id/btn008\"
  android:layout_width=\"88dp\"
  android:layout_height=\"100dp\"
  android:text=\"-\"
  android:textSize=\"20dp\"
  android:padding=\"5dp\"
  android:background=\"@drawable/qqqqqqqqqq\"/>

 </LinearLayout>
 <LinearLayout
 android:layout_width=\"match_parent\"
 android:layout_height=\"wrap_content\"
 android:orientation=\"horizontal\">
 <Button
  android:layout_marginLeft=\"5dp\"
  android:id=\"@+id/btn009\"
  android:layout_width=\"88dp\"
  android:layout_height=\"100dp\"
  android:text=\"4\"
  android:textSize=\"20dp\"
  android:padding=\"5dp\"
  android:background=\"@drawable/sssssssssssssss\"/>
 <Button
  android:id=\"@+id/btn0010\"
  android:layout_width=\"88dp\"
  android:layout_height=\"100dp\"
  android:text=\"5\"
  android:textSize=\"20dp\"
  android:padding=\"5dp\"
  android:background=\"@drawable/sssssssssssssss\"/>
 <Button
  android:id=\"@+id/btn0011\"
  android:layout_width=\"88dp\"
  android:layout_height=\"100dp\"
  android:text=\"6\"
  android:textSize=\"20dp\"
  android:padding=\"5dp\"
  android:background=\"@drawable/sssssssssssssss\"/>
 <Button
  android:id=\"@+id/btn0012\"
  android:layout_width=\"88dp\"
  android:layout_height=\"100dp\"
  android:text=\"+\"
  android:textSize=\"20dp\"
  android:padding=\"5dp\"
  android:background=\"@drawable/qqqqqqqqqq\"/>

 </LinearLayout>
 <LinearLayout
 android:layout_width=\"match_parent\"
 android:layout_height=\"wrap_content\"
 android:orientation=\"horizontal\">
 <Button
  android:layout_marginLeft=\"5dp\"
  android:id=\"@+id/btn0013\"
  android:layout_width=\"88dp\"
  android:layout_height=\"100dp\"
  android:text=\"1\"
  android:textSize=\"20dp\"
  android:padding=\"5dp\"
  android:background=\"@drawable/sssssssssssssss\"/>
 <Button
  android:id=\"@+id/btn0014\"
  android:layout_width=\"88dp\"
  android:layout_height=\"100dp\"
  android:text=\"2\"
  android:textSize=\"20dp\"
  android:padding=\"5dp\"
  android:background=\"@drawable/sssssssssssssss\"/>
 <Button
  android:id=\"@+id/btn0015\"
  android:layout_width=\"88dp\"
  android:layout_height=\"100dp\"
  android:text=\"3\"
  android:textSize=\"20dp\"
  android:padding=\"5dp\"
  android:background=\"@drawable/sssssssssssssss\"/>
 <Button
  android:id=\"@+id/btn0019\"
  android:layout_width=\"88dp\"
  android:layout_height=\"100dp\"
  android:text=\".\"
  android:textSize=\"20dp\"
  android:padding=\"5dp\"
  android:background=\"@drawable/qqqqqqqqqq\"/>

 </LinearLayout>

 <LinearLayout
 android:layout_width=\"match_parent\"
 android:layout_height=\"wrap_content\"
 android:orientation=\"horizontal\">
 <Button
  android:layout_marginLeft=\"5dp\"
  android:id=\"@+id/btn0018\"
  android:layout_width=\"88dp\"
  android:layout_height=\"100dp\"
  android:text=\"0\"
  android:textSize=\"20dp\"
  android:padding=\"5dp\"
  android:background=\"@drawable/sssssssssssssss\"/>
 <Button
  android:id=\"@+id/btn0016\"
  android:layout_width=\"265dp\"
  android:layout_height=\"100dp\"
  android:text=\"=\"
  android:textSize=\"20dp\"
  android:padding=\"5dp\"
  android:background=\"#6495ED\"/>

 

 </LinearLayout>
</LinearLayout>

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<str1.length();){
   int count =1;
   a:for(int j =i+1;j<str1.length();j++){
   char c =str1.charAt(j);
   if(c==\'×\'||c==\'÷\'){
    break a;
   }else{
    count++;
   }
   }

   //将数字截取出来
   String s2 =str1.substring(i,i+count);
   double d = Double.parseDouble(s2);
   if(i==0){
   total = d;
   }else{
   char c1 = str1.charAt(i-1);
   if(c1==\'×\'){
    total*=d;
   }else if(c1==\'÷\'){
    //如果除数为0，直接返回null;
    if(d == 0)
    return null;
    total/=d;
   }
   }
   i+=count+1;
  }
  s= s.replace(str1, total+\"\");
  }
 }
 //进行加减运算
 for(int i =0;i<s.length();i++){
  int count =1;
  a:for(int j=i+1;j<s.length();j++){
  char c = s.charAt(j);
  if(c==\'+\'||c==\'-\'){
   break a;
  }else{
   count++;
  }
  }
  String s3= s.substring(i,i+count);
  double d2 = Double.parseDouble(s3);
  if(i==0){
  total1 = d2;
  }else{
  char c = s.charAt(i-1);
  if(c==\'+\'){
   total1+=d2;
  }else if(c==\'-\'){
   total1-=d2;
  }
  }
  i+=count;
 }
 return total1;
 }

}

4.XML文件

<?xml version=\"1.0\" encoding=\"utf-8\"?>
<shape xmlns:android=\"http://schemas.android.com/apk/res/android\">
 <gradient android:startColor=\"#c0000000\" android:endColor=\"#c0000000\" android:angle=\"90\" /><!--背景颜色渐变 angle为渐变角度-->
 <solid android:color=\" #8DEEEE\" /><!-- 背景填充颜色 -->
 <stroke android:width=\"0.5dp\" android:color=\"#ff000000\" /><!-- 描边，边框宽度、颜色 -->
 <corners android:radius=\"0dp\" /><!-- 边角圆弧的半径 -->
 <padding android:left=\"0dp\" android:top=\"0dp\" android:right=\"0dp\" android:bottom=\"0dp\" /><!-- 四周留出来的空白 -->
</shape>

<?xml version=\"1.0\" encoding=\"utf-8\"?>

<shape xmlns:android=\"http://schemas.android.com/apk/res/android\">
<gradient android:startColor=\"#c0000000\" android:endColor=\"#c0000000\" android:angle=\"90\" /><!--背景颜色渐变 angle为渐变角度-->
<solid android:color=\"#00FFFF\" /><!-- 背景填充颜色 -->
<stroke android:width=\"0.5dp\" android:color=\"#ff000000\" /><!-- 描边，边框宽度、颜色 -->
<corners android:radius=\"0dp\" /><!-- 边角圆弧的半径 -->
<padding android:left=\"0dp\" android:top=\"0dp\" android:right=\"0dp\" android:bottom=\"0dp\" /><!-- 四周留出来的空白 -->
</shape>

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！

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持自学编程网。