将代码中的英文文本替换成中文文本，例如Clear”替换成“清除”，Calculator”替换成“计算器”等。

代码示例：

public class MainActivity extends AppCompatActivity {

    private EditText mResultEt;

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

        mResultEt = findViewById(R.id.result_et);
    }

    public void onNumberClick(View view) {
        Button button = (Button) view;
        mResultEt.append(button.getText().toString());
    }

    public void onClearClick(View view) {
        mResultEt.setText("");
    }

    public void onEqualsClick(View view) {
        String expression = mResultEt.getText().toString();
        try {
            Expression e = new ExpressionBuilder(expression).build();
            double result = e.evaluate();
            mResultEt.setText(Double.toString(result));
        } catch (Exception ex) {
            Toast.makeText(this, "输入表达式有误！", Toast.LENGTH_SHORT).show();
        }
    }
}

XML布局文件示例：