写一个Android Studio 计算器代码

当然，我很乐意帮您写一个Android Studio计算器代码！以下是一个基本的示例：

public class MainActivity extends AppCompatActivity {
    private String currentNumber = "";
    private String currentOperation = "";
    private TextView resultTextView;
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
 
        resultTextView = (TextView)findViewById(R.id.resultTextView);
        resultTextView.setKeyListener(null);
    }
 
    public void onNumberButtonClick(View view) {
        Button button = (Button)view;
        currentNumber += button.getText().toString();
        updateResult();
    }
 
    public void onOperationButtonClick(View view) {
        Button button = (Button)view;
        String operation = button.getText().toString().toLowerCase();
 
        if (operation.equals("=")) {
            calculate();
            return;
        }
 
        if (!currentNumber.isEmpty()) {
            calculate();
        }
 
        currentOperation = operation;
        updateResult();
    }
 
    private void calculate() {
        if (!currentOperation.isEmpty()) {
            double currentValue = Double.parseDouble(currentNumber);
            double resultValue = 0;
 
            if (currentOperation.equals("+")) {
                resultValue = currentValue + Double.parseDouble(resultTextView.getText().toString());
 
            } else if (currentOperation.equals("-")) {
                resultValue = Double.parseDouble(resultTextView.getText().toString()) - currentValue;
 
            } else if (currentOperation.equals("x")) {
                resultValue = currentValue * Double.parseDouble(resultTextView.getText().toString());
 
            } else if (currentOperation.equals("/")) {
                if (currentValue != 0) {
                    resultValue = Double.parseDouble(resultTextView.getText().toString()) / currentValue;
                } else {
                    Toast.makeText(this, "Cannot divide by zero", Toast.LENGTH_LONG).show();
                    return;
                }
            }
 
            resultTextView.setText(String.valueOf(resultValue));
            currentNumber = "";
            currentOperation = "";
        }
    }
 
    public void onClearButtonClick(View view) {
        currentNumber = "";
        currentOperation = "";
        resultTextView.setText("");
    }
 
    private void updateResult() {
        resultTextView.setText(currentNumber + " " + currentOperation);
    }
}

这段代码实现了一个简单的四则运算计算器，您可以将其复制到您的Android Studio项目中，并对其进行适当修改，以满足您的实际需求。希望对您有所帮助！