Currency Unit Conversion [USD & BDT]

//Rijoanul Hasan Shanto
//Thursday, April 19, 2018

package com.example.robert_jr.myapplication;

import android.support.annotation.StringDef;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

    private Button btnConvert;
    private EditText edtValue;
    private TextView txtAns;


    private RadioButton getButton;
    private RadioButton rbtnBtoU;
    private RadioButton rbtnUtoB;

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

        btnConvert = (Button) findViewById(R.id.btnConvert);
        edtValue = (EditText) findViewById(R.id.edtValue);
        txtAns = (TextView) findViewById(R.id.txtAns);

        rbtnBtoU = (RadioButton) findViewById(R.id.rbtnBtou);
        rbtnUtoB = (RadioButton) findViewById(R.id.rbtnUtob);

        btnConvert.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if(!new String(edtValue.getText().toString()).equals("") && edtValue.getText().toString().length() > 0)
                {
                    String sval = edtValue.getText().toString();
                    double val = Double.parseDouble(sval), result = 0.0;

                    if(rbtnBtoU.isChecked())
                    {
                        result = val / 83.8;
                    }
                    else if(rbtnUtoB.isChecked())
                    {
                        result = 83.8 * val;
                    }

                    sval = String.valueOf(result);

                    txtAns.setText(sval);
                }
                else
                {
                    txtAns.setText("Null");
                }
                 //getButton.getText().toString());
            }
        });
    }
}