public void afterTextChanged(Editable s) {
    }
public void beforeTextChanged(CharSequence s, int start, int count,int after) {
}
public void onTextChanged(CharSequence s, int start, int before,int count) {
    if (s.length() == 0)
    calculateHour();
    }
});

public void afterTextChanged(Editable s) {
    }
    public void beforeTextChanged(CharSequence s, int start, int count,int after) {
}
    public void onTextChanged(CharSequence s, int start, int before,int count) {
    if (s.length() == 0 )
    calculateDakika();
    }
    });
}

private void calculateHour() {
    try {
        fEtH = Float.parseFloat(etHour.getText().toString());
    } catch (NumberFormatException e) {
    }
    sonuc1 = fEtH * 60;
    etMinute.setText(String.valueOf(sonuc1));
}

private void calculateDakika() {
    try {
        fEtM = Float.parseFloat(etMinute.getText().toString());
    } catch (NumberFormatException e) {
    }
    sonuc2 = fEtM / 60;
    etHour.setText(String.valueOf(sonuc2));
}