android studio 进行连续无优先级加减乘除的计算器代码

以下是一个基本的Android Studio计算器代码，可以进行加减乘除的运算：

public class MainActivity extends AppCompatActivity {
    private EditText editText;
    private String currentOperator = "";
    private double firstNumber = 0;
    private boolean operatorPressed = false;
    private boolean decimalPressed = false;

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

        editText = findViewById(R.id.editText);
        editText.setKeyListener(null);
    }

    public void onNumberClick(View view) {
        Button button = (Button) view;
        String buttonText = button.getText().toString();
        String currentText = editText.getText().toString();

        if (currentText.equals("0")) {
            editText.setText(buttonText);
        } else {
            editText.setText(currentText + buttonText);
        }

        operatorPressed = false;
    }

    public void onOperatorClick(View view) {
        Button button = (Button) view;
        String buttonText = button.getText().toString();

        if (operatorPressed) {
            currentOperator = buttonText;
            return;
        }

        if (firstNumber == 0) {
            firstNumber = Double.parseDouble(editText.getText().toString());
        } else {
            double secondNumber = Double.parseDouble(editText.getText().toString());

            switch (currentOperator) {
                case "+":
                    firstNumber += secondNumber;
                    break;
                case "-":
                    firstNumber -= secondNumber;
                    break;
                case "×":
                    firstNumber *= secondNumber;
                    break;
                case "÷":
                    firstNumber /= secondNumber;
                    break;
            }
        }

        currentOperator = buttonText;
        operatorPressed = true;
        decimalPressed = false;
    }

    public void onClearClick(View view) {
        firstNumber = 0;
        currentOperator = "";
        operatorPressed = false;
        decimalPressed = false;
        editText.setText("0");
    }

    public void onDecimalClick(View view) {
        if (decimalPressed) {
            return;
        }

        String currentText = editText.getText().toString();
        editText.setText(currentText + ".");
        decimalPressed = true;
    }

    public void onEqualClick(View view) {
        if (operatorPressed) {
            return;
        }

        double secondNumber = Double.parseDouble(editText.getText().toString());

        switch (currentOperator) {
            case "+":
                firstNumber += secondNumber;
                break;
            case "-":
                firstNumber -= secondNumber;
                break;
            case "×":
                firstNumber *= secondNumber;
                break;
            case "÷":
                firstNumber /= secondNumber;
                break;
        }

        editText.setText(String.valueOf(firstNumber));
        operatorPressed = true;
        decimalPressed = false;
    }
}

在此代码中，我们使用了四个按钮，分别对应数字、加号、减号、乘号、除号、小数点和清除。我们在onNumberClick()函数中处理了数字按钮的点击事件，将每个数字附加到文本框中。在onOperatorClick()函数中处理运算符按钮的点击事件，根据当前选择的运算符执行相应的计算。在onClearClick()函数中处理清除按钮的点击事件，将文本框重置为0。在onDecimalClick()函数中处理小数点按钮的点击事件，我们确保只添加一个小数点。最后，在onEqualClick()函数中处理等于按钮的点击事件，完成最终的计算。