Android studio计算器代码

以下是一个简单的 Android Studio 计算器代码，支持加减乘除和清零操作：

1. 在 XML 文件中创建 UI 布局：

<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:textAlignment="textEnd"
        android:textSize="24sp"
        android:padding="16dp"/>

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

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

        <Button
            android:id="@+id/buttonDivide"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="/"/>

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

        <Button
            android:id="@+id/buttonDelete"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="DEL"/>
    </LinearLayout>

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

        <Button
            android:id="@+id/buttonSeven"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="7"/>

        <Button
            android:id="@+id/buttonEight"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="8"/>

        <Button
            android:id="@+id/buttonNine"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="9"/>

        <Button
            android:id="@+id/buttonMinus"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="-"/>
    </LinearLayout>

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

        <Button
            android:id="@+id/buttonFour"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="4"/>

        <Button
            android:id="@+id/buttonFive"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="5"/>

        <Button
            android:id="@+id/buttonSix"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="6"/>

        <Button
            android:id="@+id/buttonPlus"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="+"/>
    </LinearLayout>

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

        <Button
            android:id="@+id/buttonOne"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="1"/>

        <Button
            android:id="@+id/buttonTwo"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="2"/>

        <Button
            android:id="@+id/buttonThree"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="3"/>

        <Button
            android:id="@+id/buttonEqual"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="="/>
    </LinearLayout>

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

2. 在 Java 文件中添加计算逻辑：

public class MainActivity extends AppCompatActivity {

    private TextView resultTextView;
    private String operand1 = "";
    private String operand2 = "";
    private String operator = "";
    private String result = "";

    @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);
        Button buttonDivide = findViewById(R.id.buttonDivide);
        Button buttonMultiply = findViewById(R.id.buttonMultiply);
        Button buttonDelete = findViewById(R.id.buttonDelete);
        Button buttonSeven = findViewById(R.id.buttonSeven);
        Button buttonEight = findViewById(R.id.buttonEight);
        Button buttonNine = findViewById(R.id.buttonNine);
        Button buttonMinus = findViewById(R.id.buttonMinus);
        Button buttonFour = findViewById(R.id.buttonFour);
        Button buttonFive = findViewById(R.id.buttonFive);
        Button buttonSix = findViewById(R.id.buttonSix);
        Button buttonPlus = findViewById(R.id.buttonPlus);
        Button buttonOne = findViewById(R.id.buttonOne);
        Button buttonTwo = findViewById(R.id.buttonTwo);
        Button buttonThree = findViewById(R.id.buttonThree);
        Button buttonEqual = findViewById(R.id.buttonEqual);
        Button buttonZero = findViewById(R.id.buttonZero);

        buttonClear.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                operand1 = "";
                operand2 = "";
                operator = "";
                result = "";
                resultTextView.setText(result);
            }
        });

        buttonDivide.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                operator = "/";
                if (!operand1.equals("")) {
                    resultTextView.setText(operand1 + operator);
                }
            }
        });

        buttonMultiply.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                operator = "*";
                if (!operand1.equals("")) {
                    resultTextView.setText(operand1 + operator);
                }
            }
        });

        buttonDelete.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (operator.equals("")) {
                    operand1 = operand1.substring(0, operand1.length() - 1);
                    resultTextView.setText(operand1);
                } else {
                    operand2 = operand2.substring(0, operand2.length() - 1);
                    resultTextView.setText(operand1 + operator + operand2);
                }
            }
        });

        buttonSeven.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (operator.equals("")) {
                    operand1 += "7";
                    resultTextView.setText(operand1);
                } else {
                    operand2 += "7";
                    resultTextView.setText(operand1 + operator + operand2);
                }
            }
        });

        buttonEight.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (operator.equals("")) {
                    operand1 += "8";
                    resultTextView.setText(operand1);
                } else {
                    operand2 += "8";
                    resultTextView.setText(operand1 + operator + operand2);
                }
            }
        });

        buttonNine.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (operator.equals("")) {
                    operand1 += "9";
                    resultTextView.setText(operand1);
                } else {
                    operand2 += "9";
                    resultTextView.setText(operand1 + operator + operand2);
                }
            }
        });

        buttonMinus.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                operator = "-";
                if (!operand1.equals("")) {
                    resultTextView.setText(operand1 + operator);
                }
            }
        });

        buttonFour.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (operator.equals("")) {
                    operand1 += "4";
                    resultTextView.setText(operand1);
                } else {
                    operand2 += "4";
                    resultTextView.setText(operand1 + operator + operand2);
                }
            }
        });

        buttonFive.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (operator.equals("")) {
                    operand1 += "5";
                    resultTextView.setText(operand1);
                } else {
                    operand2 += "5";
                    resultTextView.setText(operand1 + operator + operand2);
                }
            }
        });

        buttonSix.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (operator.equals("")) {
                    operand1 += "6";
                    resultTextView.setText(operand1);
                } else {
                    operand2 += "6";
                    resultTextView.setText(operand1 + operator + operand2);
                }
            }
        });

        buttonPlus.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                operator = "+";
                if (!operand1.equals("")) {
                    resultTextView.setText(operand1 + operator);
                }
            }
        });

        buttonOne.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (operator.equals("")) {
                    operand1 += "1";
                    resultTextView.setText(operand1);
                } else {
                    operand2 += "1";
                    resultTextView.setText(operand1 + operator + operand2);
                }
            }
        });

        buttonTwo.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (operator.equals("")) {
                    operand1 += "2";
                    resultTextView.setText(operand1);
                } else {
                    operand2 += "2";
                    resultTextView.setText(operand1 + operator + operand2);
                }
            }
        });

        buttonThree.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (operator.equals("")) {
                    operand1 += "3";
                    resultTextView.setText(operand1);
                } else {
                    operand2 += "3";
                    resultTextView.setText(operand1 + operator + operand2);
                }
            }
        });

        buttonEqual.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (!operand1.equals("") && !operand2.equals("") && !operator.equals("")) {
                    double d1 = Double.parseDouble(operand1);
                    double d2 = Double.parseDouble(operand2);
                    if (operator.equals("/")) {
                        result = String.valueOf(d1 / d2);
                    } else if (operator.equals("*")) {
                        result = String.valueOf(d1 * d2);
                    } else if (operator.equals("-")) {
                        result = String.valueOf(d1 - d2);
                    } else if (operator.equals("+")) {
                        result = String.valueOf(d1 + d2);
                    }
                    resultTextView.setText(result);
                    operand1 = result;
                    operand2 = "";
                    operator = "";
                }
            }
        });

        buttonZero.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (operator.equals("")) {
                    operand1 += "0";
                    resultTextView.setText(operand1);
                } else {
                    operand2 += "0";
                    resultTextView.setText(operand1 + operator + operand2);
                }
            }
        });
    }
}

以上就是 Android Studio 计算器的简单实现。注意，此处没有进行错误处理，例如用户输入非法字符或除数为零等情况。