Hilfe bei BMI Rechner

1public class CalculateBMI extends Activity {
2
3 @Override
4 protected void onCreate(Bundle savedInstanceState) {
5 super.onCreate(savedInstanceState);
6 setContentView(R.layout.activity_calculate_bmi);
7 }
8
9 @Override
10 public boolean onCreateOptionsMenu(Menu menu) {
11 // Inflate the menu; this adds items to the action bar if it is present.
12 getMenuInflater().inflate(R.menu.calculate_bmi, menu);
13 return true;
14 }
15 public void ButtonKlick (View view) {
16 double g;
17 double l;
18 double BMI;
19 EditText Feld1 = (EditText)findViewById(R.id.eTgewicht);
20 EditText Feld2 = (EditText)findViewById(R.id.eTgroesse);
21 EditText FeldBMI = (EditText)findViewById(R.id.etErgebnis);
22 if (Feld1.getText().toString().length() == 0) {
23 return;
24 }
25 if (Feld2.getText().toString().length() == 0) {
26 return;
27 }
28 g = Feld1.getText().toString(); // g steht für gewicht
29 l = Feld2.getText().toString(); // l steht für Länge
30 BMI = g/(l*l);
31
32 FeldBMI.setText(String.valueOf(BMI));
33 }
34
35}

1g = Feld1.getText().toString();
2l = Feld2.getText().toString();

1l = Double.parseString("99");

1g = Double.parseString(Feld1.getText().toString();

1g = Integer.parseInt(Feld1.getText().toString());