When I try running my Android App, I get an error saying: java.lang.NumberFormatException: Invalid double: "". This is my code:
public class MainActivity extends Activity {
double score;
EditText gpa;
EditText sat;
EditText act;
Button calc;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
gpa = (EditText) findViewById(R.id.gpa);
String gpaString = gpa.getText().toString();
final double gpaDouble = Double.parseDouble(gpaString);
sat = (EditText) findViewById(R.id.sat);
String satString = sat.getText().toString();
final int satInt = Integer.parseInt(satString);
act = (EditText) findViewById(R.id.act);
String actString = act.getText().toString();
final int actInt = Integer.parseInt(actString);
calc = (Button) findViewById(R.id.calc);
calc.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
if(actInt/36>satInt/2400){
score = (0.6*gpaDouble*25)+(0.4*(actInt/36)*100);
}else{
score = (0.6*gpaDouble*25)+(0.4*(satInt/2400)*100);
}
}
});
}
}
I essentially want to get numbers from three EditTexts, make one of them into a double and the other two into ints. Then I would use these variables to set the value for another double variable. I am not getting errors before I run the app. I feel that when the EditText field is blank, it will not parse correctly, but I am unsure how to solve this. What is the problem?
