androidstudio实现计算器,生成代码

非常感谢您的提问。以下是一个简单的 Android Studio 计算器的代码示例：

activity_main.xml：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <TextView
        android:id="@+id/resultTextView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textSize="24sp"
        android:gravity="end"
        android:padding="16dp"
        android:text="0" />

    <GridLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:rowCount="5"
        android:columnCount="4">

        <Button
            android:id="@+id/buttonClear"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_row="0"
            android:layout_column="0"
            android:layout_columnWeight="1"
            android:text="C" />

        <Button
            android:id="@+id/buttonSign"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_row="0"
            android:layout_column="1"
            android:layout_columnWeight="1"
            android:text="+/-" />

        <Button
            android:id="@+id/buttonPercent"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_row="0"
            android:layout_column="2"
            android:layout_columnWeight="1"
            android:text="%" />

        <Button
            android:id="@+id/buttonDivide"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_row="0"
            android:layout_column="3"
            android:layout_columnWeight="1"
            android:text="/" />

        <Button
            android:id="@+id/button7"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_row="1"
            android:layout_column="0"
            android:layout_columnWeight="1"
            android:text="7" />

        <Button
            android:id="@+id/button8"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_row="1"
            android:layout_column="1"
            android:layout_columnWeight="1"
            android:text="8" />

        <Button
            android:id="@+id/button9"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_row="1"
            android:layout_column="2"
            android:layout_columnWeight="1"
            android:text="9" />

        <Button
            android:id="@+id/buttonMultiply"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_row="1"
            android:layout_column="3"
            android:layout_columnWeight="1"
            android:text="*" />

        <Button
            android:id="@+id/button4"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_row="2"
            android:layout_column="0"
            android:layout_columnWeight="1"
            android:text="4" />

        <Button
            android:id="@+id/button5"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_row="2"
            android:layout_column="1"
            android:layout_columnWeight="1"
            android:text="5" />

        <Button
            android:id="@+id/button6"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_row="2"
            android:layout_column="2"
            android:layout_columnWeight="1"
            android:text="6" />

        <Button
            android:id="@+id/buttonSubtract"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_row="2"
            android:layout_column="3"
            android:layout_columnWeight="1"
            android:text="-" />

        <Button
            android:id="@+id/button1"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_row="3"
            android:layout_column="0"
            android:layout_columnWeight="1"
            android:text="1" />

        <Button
            android:id="@+id/button2"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_row="3"
            android:layout_column="1"
            android:layout_columnWeight="1"
            android:text="2" />

        <Button
            android:id="@+id/button3"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_row="3"
            android:layout_column="2"
            android:layout_columnWeight="1"
            android:text="3" />

        <Button
            android:id="@+id/buttonAdd"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_row="3"
            android:layout_column="3"
            android:layout_columnWeight="1"
            android:text="+" />

        <Button
            android:id="@+id/button0"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_row="4"
            android:layout_column="0"
            android:layout_columnSpan="2"
            android:layout_columnWeight="2"
            android:text="0" />

        <Button
            android:id="@+id/buttonDecimal"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_row="4"
            android:layout_column="2"
            android:layout_columnWeight="1"
            android:text="." />

        <Button
            android:id="@+id/buttonEquals"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_row="4"
            android:layout_column="3"
            android:layout_columnWeight="1"
            android:text="=" />

    </GridLayout>

</LinearLayout>

MainActivity.java：

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

import androidx.appcompat.app.AppCompatActivity;

import java.text.DecimalFormat;

public class MainActivity extends AppCompatActivity {

    private TextView resultTextView;

    private String currentNumber = "";
    private String lastOperation = "";
    private double result = 0;

    private DecimalFormat decimalFormat = new DecimalFormat("#.##########");

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

        resultTextView = findViewById(R.id.resultTextView);

        Button buttonClear = findViewById(R.id.buttonClear);
        buttonClear.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                clear();
            }
        });

        Button buttonSign = findViewById(R.id.buttonSign);
        buttonSign.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                sign();
            }
        });

        Button buttonPercent = findViewById(R.id.buttonPercent);
        buttonPercent.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                percent();
            }
        });

        Button buttonDivide = findViewById(R.id.buttonDivide);
        buttonDivide.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                operation("/");
            }
        });

        Button buttonMultiply = findViewById(R.id.buttonMultiply);
        buttonMultiply.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                operation("*");
            }
        });

        Button buttonSubtract = findViewById(R.id.buttonSubtract);
        buttonSubtract.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                operation("-");
            }
        });

        Button buttonAdd = findViewById(R.id.buttonAdd);
        buttonAdd.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                operation("+");
            }
        });

        Button buttonEquals = findViewById(R.id.buttonEquals);
        buttonEquals.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                equals();
            }
        });

        Button button0 = findViewById(R.id.button0);
        button0.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                number("0");
            }
        });

        Button button1 = findViewById(R.id.button1);
        button1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                number("1");
            }
        });

        Button button2 = findViewById(R.id.button2);
        button2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                number("2");
            }
        });

        Button button3 = findViewById(R.id.button3);
        button3.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                number("3");
            }
        });

        Button button4 = findViewById(R.id.button4);
        button4.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                number("4");
            }
        });

        Button button5 = findViewById(R.id.button5);
        button5.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                number("5");
            }
        });

        Button button6 = findViewById(R.id.button6);
        button6.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                number("6");
            }
        });

        Button button7 = findViewById(R.id.button7);
        button7.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                number("7");
            }
        });

        Button button8 = findViewById(R.id.button8);
        button8.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                number("8");
            }
        });

        Button button9 = findViewById(R.id.button9);
        button9.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                number("9");
            }
        });

        Button buttonDecimal = findViewById(R.id.buttonDecimal);
        buttonDecimal.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                decimal();
            }
        });
    }

    private void clear() {
        currentNumber = "";
        lastOperation = "";
        result = 0;
        resultTextView.setText("0");
    }

    private void sign() {
        if (!currentNumber.isEmpty()) {
            double number = Double.parseDouble(currentNumber);
            number = -number;
            currentNumber = decimalFormat.format(number);
            resultTextView.setText(currentNumber);
        }
    }

    private void percent() {
        if (!currentNumber.isEmpty()) {
            double number = Double.parseDouble(currentNumber);
            number = number / 100;
            currentNumber = decimalFormat.format(number);
            resultTextView.setText(currentNumber);
        }
    }

    private void operation(String operation) {
        if (!currentNumber.isEmpty()) {
            if (!lastOperation.isEmpty()) {
                equals();
            }
            result = Double.parseDouble(currentNumber);
            currentNumber = "";
            lastOperation = operation;
        }
    }

    private void equals() {
        if (!lastOperation.isEmpty() && !currentNumber.isEmpty()) {
            double number = Double.parseDouble(currentNumber);
            switch (lastOperation) {
                case "+":
                    result += number;
                    break;
                case "-":
                    result -= number;
                    break;
                case "*":
                    result *= number;
                    break;
                case "/":
                    result /= number;
                    break;
            }
            currentNumber = decimalFormat.format(result);
            resultTextView.setText(currentNumber);
            lastOperation = "";
        }
    }

    private void number(String number) {
        currentNumber += number;
        resultTextView.setText(currentNumber);
    }

    private void decimal() {
        if (!currentNumber.contains(".")) {
            currentNumber += ".";
            resultTextView.setText(currentNumber);
        }
    }
}

希望这个示例能够帮助您实现一个简单的 Android Studio 计算器。