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
话不多说，首先附上代码：
MainActivity.java
package com.example.calculator;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import java.util.Stack;
public class MainActivity extends AppCompatActivity {
EditText edit = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
edit = findViewById(R.id.edit_textview);
}
public void btnClick(View view) {
switch (view.getId()){
case R.id.btn0:
edit.append("0");
break;
case R.id.btn1:
edit.append("1");
break;
case R.id.btn2:
edit.append("2");
break;
case R.id.btn3:
edit.append("3");
break;
case R.id.btn4:
edit.append("4");
break;
case R.id.btn5:
edit.append("5");
break;
case R.id.btn6:
edit.append("6");
break;
case R.id.btn7:
edit.append("7");
break;
case R.id.btn8:
edit.append("8");
break;
case R.id.btn9:
edit.append("9");
break;
case R.id.btnPlus:
edit.append("+");
break;
case R.id.btnSubtract:
edit.append("-");
break;
case R.id.btnMultiply:
edit.append("*");
break;
case R.id.btnDivide:
edit.append("/");
break;
}
}
public void btnEqual(View view) {
String str = edit.getText().toString();//1+2
String res="";
//Java计算代码
String result = calculate(str);
edit.setText(result);
}
private static int number(char[] arr,int start,int end){
StringBuilder buffer = new StringBuilder();
for(int i=start;i<=end;i++){
buffer.append(arr[i]);
}
return Integer.parseInt(buffer.toString());
}
// 待实现函数，在此函数中填入答题代码
private static int comp(String op){
if(op.equals("+") || op.equals("-"))
return 1;
if(op.equals("*") || op.equals("/"))
return 2;
return 0;
}
private static String compute(Integer a,Integer b,String op){
Integer res;
if(op.equals("+")) {
res = a + b;
return res.toString();
}
if (op.equals("-")) {
res= a - b;
return res.toString();
}
if (op.equals("*")) {
res = a * b;
return res.toString();
}
if (op.equals("/") && b!=0) {
res= a / b;
return res.toString();
}else{
return "error";
}
}
private static String calculate(String source) {
Stack<Integer> numbers=new Stack<>();
Stack<String> operator=new Stack<>();
operator.push(".");
char[] exps=source.toCharArray();
int start=0;
if(exps[0]=='-') numbers.push(0);
for(int j=0;j<exps.length;j++){
if(exps[j]=='+' || exps[j]=='*' || exps[j]=='/' || exps[j]=='-'){
if (start <= j - 1) {
numbers.push(number(exps,start,j-1));
}
start=j+1;
while (comp(operator.peek())>=comp(String.valueOf(exps[j]))){
Integer two=numbers.peek();numbers.pop();
Integer one=numbers.peek();numbers.pop();
String result=compute(one,two,operator.peek());operator.pop();
if (result.equals("error")) {
return result;
}
numbers.push(Integer.parseInt(result));
}
operator.push(String.valueOf(exps[j]));
}
}
numbers.push(number(exps,start,exps.length-1));
while (operator.size()>1){
Integer two=numbers.peek();numbers.pop();
Integer one =numbers.peek();numbers.pop();
String op=operator.peek();operator.pop();
String value = compute(one, two, op);
if (value.equals("error")) {
return value;
}
numbers.push(Integer.parseInt(value));
}
return numbers.peek().toString();
}
public void btnClear(View view) {
edit.setText("");
}
}
activity_main.xml
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" tools:context=".MainActivity"> <EditText android:id="@+id/edit_textview" android:layout_width="match_parent" android:layout_height="wrap_content"/> <TableLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:stretchColumns="0,1,2,3"> <TableRow> <Button android:id="@+id/btn7" android:layout_height="match_parent" android:onClick="btnClick" android:text="7" /> <Button android:id="@+id/btn8" android:text="8" android:onClick="btnClick"/> <Button android:id="@+id/btn9" android:text="9" android:onClick="btnClick"/> <Button android:id="@+id/btnDivide" android:text="÷" android:onClick="btnClick"/> </TableRow> <TableRow> <Button android:id="@+id/btn4" android:text="4" android:onClick="btnClick"/> <Button android:id="@+id/btn5" android:text="5" android:onClick="btnClick"/> <Button android:id="@+id/btn6" android:text="6" android:onClick="btnClick"/> <Button android:id="@+id/btnMultiply" android:text="×" android:onClick="btnClick"/> </TableRow> <TableRow> <Button android:id="@+id/btn1" android:text="1" android:onClick="btnClick"/> <Button android:id="@+id/btn2" android:text="2" android:onClick="btnClick"/> <Button android:id="@+id/btn3" android:text="3" android:onClick="btnClick"/> <Button android:id="@+id/btnSubtract" android:text="-" android:onClick="btnClick"/> </TableRow> <TableRow> <Button android:id="@+id/btnClear" android:text="C" android:onClick="btnClear"/> <Button android:id="@+id/btn0" android:text="0" android:onClick="btnClick"/> <Button android:id="@+id/btnEqual" android:text="=" android:onClick="btnEqual"/> <Button android:id="@+id/btnPlus" android:text="+" android:onClick="btnClick"/> </TableRow> </TableLayout> </LinearLayout>
计算器界面：
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。
