Android studio实现科学计算器代码

以下是一个简单的科学计算器的 Android Studio 代码实现示例：

1. 首先，在 XML 布局文件中创建一个包含所有按钮的界面。

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

    <EditText
        android:id="@+id/editText"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="right"
        android:inputType="text" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <Button
            android:id="@+id/button_sin"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="sin" />

        <Button
            android:id="@+id/button_cos"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="cos" />

        <Button
            android:id="@+id/button_tan"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="tan" />

        <Button
            android:id="@+id/button_pow"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="^" />
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <Button
            android:id="@+id/button_7"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="7" />

        <Button
            android:id="@+id/button_8"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="8" />

        <Button
            android:id="@+id/button_9"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="9" />

        <Button
            android:id="@+id/button_divide"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="/" />
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <Button
            android:id="@+id/button_4"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="4" />

        <Button
            android:id="@+id/button_5"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="5" />

        <Button
            android:id="@+id/button_6"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="6" />

        <Button
            android:id="@+id/button_multiply"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="*" />
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <Button
            android:id="@+id/button_1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="1" />

        <Button
            android:id="@+id/button_2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="2" />

        <Button
            android:id="@+id/button_3"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="3" />

        <Button
            android:id="@+id/button_minus"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="-" />
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <Button
            android:id="@+id/button_0"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="0" />

        <Button
            android:id="@+id/button_clear"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="C" />

        <Button
            android:id="@+id/button_dot"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="." />

        <Button
            android:id="@+id/button_plus"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="+" />
    </LinearLayout>

    <Button
        android:id="@+id/button_equal"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="=" />

</LinearLayout>

2. 在 Activity 中实现所有按钮的点击事件并处理计算逻辑。

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

import androidx.appcompat.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity {

    private EditText editText;

    private double value1 = Double.NaN;
    private double value2;

    private static final String ADDITION = "+";
    private static final String SUBTRACTION = "-";
    private static final String MULTIPLICATION = "*";
    private static final String DIVISION = "/";

    private String CURRENT_ACTION;

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

        editText = findViewById(R.id.editText);

        Button button0 = findViewById(R.id.button_0);
        Button button1 = findViewById(R.id.button_1);
        Button button2 = findViewById(R.id.button_2);
        Button button3 = findViewById(R.id.button_3);
        Button button4 = findViewById(R.id.button_4);
        Button button5 = findViewById(R.id.button_5);
        Button button6 = findViewById(R.id.button_6);
        Button button7 = findViewById(R.id.button_7);
        Button button8 = findViewById(R.id.button_8);
        Button button9 = findViewById(R.id.button_9);
        Button buttonDot = findViewById(R.id.button_dot);
        Button buttonClear = findViewById(R.id.button_clear);
        Button buttonPlus = findViewById(R.id.button_plus);
        Button buttonMinus = findViewById(R.id.button_minus);
        Button buttonMultiply = findViewById(R.id.button_multiply);
        Button buttonDivide = findViewById(R.id.button_divide);
        Button buttonEqual = findViewById(R.id.button_equal);
        Button buttonSin = findViewById(R.id.button_sin);
        Button buttonCos = findViewById(R.id.button_cos);
        Button buttonTan = findViewById(R.id.button_tan);
        Button buttonPow = findViewById(R.id.button_pow);

        button1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                editText.setText(editText.getText() + "1");
            }
        });

        button2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                editText.setText(editText.getText() + "2");
            }
        });

        button3.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                editText.setText(editText.getText() + "3");
            }
        });

        button4.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                editText.setText(editText.getText() + "4");
            }
        });

        button5.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                editText.setText(editText.getText() + "5");
            }
        });

        button6.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                editText.setText(editText.getText() + "6");
            }
        });

        button7.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                editText.setText(editText.getText() + "7");
            }
        });

        button8.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                editText.setText(editText.getText() + "8");
            }
        });

        button9.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                editText.setText(editText.getText() + "9");
            }
        });

        button0.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                editText.setText(editText.getText() + "0");
            }
        });

        buttonDot.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                editText.setText(editText.getText() + ".");
            }
        });

        buttonClear.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                value1 = Double.NaN;
                value2 = Double.NaN;
                editText.setText("");
            }
        });

        buttonPlus.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                computeCalculation();
                CURRENT_ACTION = ADDITION;
                editText.setText(String.valueOf(value1) + "+");
            }
        });

        buttonMinus.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                computeCalculation();
                CURRENT_ACTION = SUBTRACTION;
                editText.setText(String.valueOf(value1) + "-");
            }
        });

        buttonMultiply.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                computeCalculation();
                CURRENT_ACTION = MULTIPLICATION;
                editText.setText(String.valueOf(value1) + "*");
            }
        });

        buttonDivide.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                computeCalculation();
                CURRENT_ACTION = DIVISION;
                editText.setText(String.valueOf(value1) + "/");
            }
        });

        buttonEqual.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                computeCalculation();
                editText.setText(String.valueOf(value1));
                value1 = Double.NaN;
            }
        });

        buttonSin.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                double value = Double.parseDouble(editText.getText().toString());
                double result = Math.sin(Math.toRadians(value));
                editText.setText(String.valueOf(result));
            }
        });

        buttonCos.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                double value = Double.parseDouble(editText.getText().toString());
                double result = Math.cos(Math.toRadians(value));
                editText.setText(String.valueOf(result));
            }
        });

        buttonTan.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                double value = Double.parseDouble(editText.getText().toString());
                double result = Math.tan(Math.toRadians(value));
                editText.setText(String.valueOf(result));
            }
        });

        buttonPow.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                computeCalculation();
                CURRENT_ACTION = "pow";
                editText.setText(String.valueOf(value1) + "^");
            }
        });
    }

    private void computeCalculation() {
        if (!Double.isNaN(value1)) {
            value2 = Double.parseDouble(editText.getText().toString());

            if (CURRENT_ACTION == ADDITION)
                value1 = this.value1 + value2;
            else if (CURRENT_ACTION == SUBTRACTION)
                value1 = this.value1 - value2;
            else if (CURRENT_ACTION == MULTIPLICATION)
                value1 = this.value1 * value2;
            else if (CURRENT_ACTION == DIVISION)
                value1 = this.value1 / value2;
            else if (CURRENT_ACTION == "pow")
                value1 = Math.pow(value1, value2);
        } else {
            try {
                value1 = Double.parseDouble(editText.getText().toString());
            } catch (Exception e) {
            }
        }
    }
}

这样，你就可以运行该应用程序并使用该科学计算器进行计算了。