我正在做计算器应用程序。即使我不使用double，结果也会显示double。例）1+1=2.0
但我想要1+1=2
当然，我想保留double，当有double时，比如1.2+1.3=2.5
我应该如何编辑？
我试着这样编辑，但有一个错误。

public void equalsOnClick(View view)
{
    Integer result = null;
    ScriptEngine engine = new ScriptEngineManager().getEngineByName("rhino");

    try {
        result = (int)engine.eval(workings);
    } catch (ScriptException e)
    {
        Toast.makeText(this, "Invalid Input", Toast.LENGTH_SHORT).show();
    }

    if(result != null)
        resultsTV.setText(String.valueOf(result.intValue()));

}

主要活动

public class MainActivity extends AppCompatActivity {

    TextView workingsTV;
    TextView resultsTV;

    String workings = "";

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

    private void initTextView()
    {
        workingsTV = (TextView)findViewById(R.id.workingsTextView);
        resultsTV = (TextView)findViewById(R.id.resultTextView);
    }

    private void setWorkings(String givenValue)
    {
        workings = workings + givenValue;
        workingsTV.setText(workings);
    }

    public void equalsOnClick(View view)
    {
        Double result = null;
        ScriptEngine engine = new ScriptEngineManager().getEngineByName("rhino");

        try {
            result = (double)engine.eval(workings);
        } catch (ScriptException e)
        {
            Toast.makeText(this, "Invalid Input", Toast.LENGTH_SHORT).show();
        }

        if(result != null)
            resultsTV.setText(String.valueOf(result.doubleValue()));
    }

    public void clearOnClick(View view)
    {
        workingsTV.setText("");
        workings = "";
        resultsTV.setText("");
        leftBracket = true;
    }
}