android studio计算器代码

下面是一份简单的 Android Studio 计算器代码，它可以实现加减乘除运算：

package com.example.calculator;

import androidx.appcompat.app.AppCompatActivity;

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

public class MainActivity extends AppCompatActivity {

    Button btnAdd, btnSubtract, btnMultiply, btnDivide;
    EditText etFirstNumber, etSecondNumber;
    TextView tvResult;

    float result;
    float firstNumber, secondNumber;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        btnAdd = (Button) findViewById(R.id.btnAdd);
        btnSubtract = (Button) findViewById(R.id.btnSubtract);
        btnMultiply = (Button) findViewById(R.id.btnMultiply);
        btnDivide = (Button) findViewById(R.id.btnDivide);
        etFirstNumber = (EditText) findViewById(R.id.etFirstNumber);
        etSecondNumber = (EditText) findViewById(R.id.etSecondNumber);
        tvResult = (TextView) findViewById(R.id.tvResult);

        btnAdd.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                firstNumber = Float.parseFloat(etFirstNumber.getText().toString());
                secondNumber = Float.parseFloat(etSecondNumber.getText().toString());
                result = firstNumber + secondNumber;
                tvResult.setText(Float.toString(result));
            }
        });

        btnSubtract.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                firstNumber = Float.parseFloat(etFirstNumber.getText().toString());
                secondNumber = Float.parseFloat(etSecondNumber.getText().toString());
                result = firstNumber - secondNumber;
                tvResult.setText(Float.toString(result));
            }
        });

        btnMultiply.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                firstNumber = Float.parseFloat(etFirstNumber.getText().toString());
                secondNumber = Float.parseFloat(etSecondNumber.getText().toString());
                result = firstNumber * secondNumber;
                tvResult.setText(Float.toString(result));
            }
        });

        btnDivide.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                firstNumber = Float.parseFloat(etFirst以下是一个简单的Android Studio计算器的代码示例，该示例只实现了加减乘除四种运算：

import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

private EditText input1, input2;
private TextView result;
private Button addBtn, subBtn, mulBtn, divBtn;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

input1 = findViewById(R.id.input1);
input2 = findViewById(R.id.input2);
result = findViewById(R.id.result);
addBtn = findViewById(R.id.addBtn);
subBtn = findViewById(R.id.subBtn);
mulBtn = findViewById(R.id.mulBtn);
divBtn = findViewById(R.id.divBtn);

addBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
double num1 = Double.parseDouble(input1.getText().toString());
double num2 = Double.parseDouble(input2.getText().toString());
double sum = num1 + num2;
result.setText(String.valueOf(sum));
}
});

subBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
double num1 = Double.parseDouble(input1.getText().toString());
double num2 = Double.parseDouble(input2.getText().toString());
double diff = num1 - num2;
result.setText(String.valueOf(diff));
}
});

mulBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
double num1 = Double.parseDouble(input1.getText().toString());
double num2 = Double.parseDouble(input2.getText().toString());
double mul = num1 * num2;
result.setText(String.valueOf(mul));
}
});

divBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
double num1 = Double.parseDouble(input1.getText().toString());
double num2 = Double.parseDouble(input2.getText().toString());
if(num2 != 0) {
double div = num1 / num2;
result.这是一个简单的 Android Studio 计算器的示例代码：

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {
    EditText num1, num2;
    Button add, sub, mul, div;
    TextView result;

    float result_num;
    int num1_int, num2_int;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        num1 = (EditText)findViewById(R.id.num1);
        num2 = (EditText)findViewById(R.id.num2);
        add = (Button)findViewById(R.id.add);
        sub = (Button)findViewById(R.id.sub);
        mul = (Button)findViewById(R.id.mul);
        div = (Button)findViewById(R.id.div);
        result = (TextView)findViewById(R.id.result);

        add.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                num1_int = Integer.parseInt(num1.getText().toString());
                num2_int = Integer.parseInt(num2.getText().toString());
                result_num = num1_int + num2_int;
                result.setText(String.valueOf(result_num));
            }
        });

        sub.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                num1_int = Integer.parseInt(num1.getText().toString());
                num2_int = Integer.parseInt(num2.getText().toString());
                result_num = num1_int - num2_int;
                result.setText(String.valueOf(result_num));
            }
        });

        mul.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                num1_int = Integer.parseInt(num1.getText().toString());
                num2_int = Integer.parseInt(num2.getText().toString());
                result_num = num1_int * num2_int;
                result.setText(String.valueOf(result_num));
            }
        });

        div.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                num1_int = Integer.parseInt(num1.getText().toString());
                num2_int = Integer.parseInt(num2.getText().toString());
                result_num = (float)num1_int / (float)num2_int;
                result.setText这是一段简单的Android Studio计算器代码示例：

package com.example.calculator;

import androidx.appcompat.app.AppCompatActivity;

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

public class MainActivity extends AppCompatActivity {

EditText number1;
EditText number2;
Button add;
Button subtract;
Button multiply;
Button divide;
TextView result;

float result_num;
int num1, num2;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

number1 = (EditText) findViewById(R.id.number1);
number2 = (EditText) findViewById(R.id.number2);
add = (Button) findViewById(R.id.add);
subtract = (Button) findViewById(R.id.subtract);
multiply = (Button) findViewById(R.id.multiply);
divide = (Button) findViewById(R.id.divide);
result = (TextView) findViewById(R.id.result);

add.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
num1 = Integer.parseInt(number1.getText().toString());
num2 = Integer.parseInt(number2.getText().toString());
result_num = num1 + num2;
result.setText(String.valueOf(result_num));
}
});

subtract.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
num1 = Integer.parseInt(number1.getText().toString());
num2 = Integer.parseInt(number2.getText().toString());
result_num = num1 - num2;
result.setText(String.valueOf(result_num));
}
});

multiply.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
num1 = Integer.parseInt(number1.getText().toString());
num2 = Integer.parseInt(number2.getText().toString());
result_num = num1 * num2;
result.setText(String.valueOf(result_num));
}
});

divide.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
num1 = Integer.parseInt(number1.getText().toString());
num2 = Integer.parseInt(number2.getText().toString());
result_num = (float)num1 / num2;
result.setText(String.valueOf(result_num));这是一个简单的Android Studio计算器代码示例：

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

    EditText num1;
    EditText num2;
    Button add;
    Button subtract;
    Button multiply;
    Button divide;
    TextView result;

    float result_num;
    int num1_int, num2_int;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        num1 = (EditText)findViewById(R.id.num1);
        num2 = (EditText)findViewById(R.id.num2);
        add = (Button)findViewById(R.id.add);
        subtract = (Button)findViewById(R.id.subtract);
        multiply = (Button)findViewById(R.id.multiply);
        divide = (Button)findViewById(R.id.divide);
        result = (TextView)findViewById(R.id.result);

        add.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                num1_int = Integer.parseInt(num1.getText().toString());
                num2_int = Integer.parseInt(num2.getText().toString());
                result_num = num1_int + num2_int;
                result.setText(String.valueOf(result_num));
            }
        });

        subtract.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                num1_int = Integer.parseInt(num1.getText().toString());
                num2_int = Integer.parseInt(num2.getText().toString());
                result_num = num1_int - num2_int;
                result.setText(String.valueOf(result_num));
            }
        });

        multiply.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                num1_int = Integer.parseInt(num1.getText().toString());
                num2_int = Integer.parseInt(num2.getText().toString());
                result_num = num1_int * num2_int;
                result.setText(String.valueOf(result_num));
            }
        });

        divide.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                num1_int = Integer.parseInt(num1.getText().toString());
                num2_int = Integer.parseInt(num2.getText().toString());
                result_num = (float)num1_int /上面给出的代码是一个简单的Android Studio计算器的代码示例，该示例只实现了加减乘除四种运算。在这个示例中，定义了4个按钮（加、减、乘、除）、2个输入框（输入数字1和数字2）和1个文本框（显示运算结果），并为每个按钮添加点击事件，在点击事件中实现对应的运算。请注意，这只是一个简单的示例，可能需要根据您的需求进行修改。