get string of radio button in android
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.Toast;
public class MyAndroidAppActivity extends Activity {
  private RadioGroup radioGroup;
  private RadioButton radioButton;
  private Button btnDisplay;
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    addListenerOnButton();
  }
  public void addListenerOnButton() {
    radioGroup = (RadioGroup) findViewById(R.id.radio);
    btnDisplay = (Button) findViewById(R.id.btnDisplay);
    btnDisplay.setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View v) {
                // get selected radio button from radioGroup
            int selectedId = radioGroup.getCheckedRadioButtonId();
            // find the radiobutton by returned id
            radioButton = (RadioButton) findViewById(selectedId);
            Toast.makeText(MyAndroidAppActivity.this,
                radioButton.getText(), Toast.LENGTH_SHORT).show();
        }
    });
  }
}
