Converting String to Double in Android

Question

Trying to get double values from an EditText and manipulate them before passing them to another Intent. Not using primitive data type so I can use toString methods.

Problem is when I include the protein=Double.valueOf(p).doubleValue(); style commands, the program force closes immediately without leaving any info in the logcat.If I comment them out and set some dummy data like protein = 1.0; it works with no problems. Same happens with primitive data types and parse double. This code works perfectly with dummy data in normal java. What am I doing wrong?

EditText txtProt, txtCarb, txtFat, txtFiber, txtPoints; String p, c, f, fi; Double protein, carbs, fat, fiber; double temp; Integer points;  @Override public void onCreate(Bundle savedInstanceState) {      super.onCreate(savedInstanceState);      Log.v("Create Prompt", "ready for layout");      setContentView(R.layout.main);      Log.v("Layout Created", "ready for variable assignment");      txtProt = (EditText) findViewById(R.id.Protein);      txtCarb = (EditText) findViewById(R.id.Carbs);      txtFat = (EditText) findViewById(R.id.Fat);      txtFiber = (EditText) findViewById(R.id.Fiber);      txtPoints = (EditText) findViewById(R.id.Points);      btnCalc = (Button) findViewById(R.id.Calc);      Log.v("Variables Assigned", "ready for double assignment");       p = txtProt.getText().toString();      c = txtCarb.getText().toString();      f = txtFat.getText().toString();      fi = txtFiber.getText().toString();        protein=Double.valueOf(p).doubleValue();      carbs=Double.valueOf(c).doubleValue();      fat=Double.valueOf(f).doubleValue();      fiber=Double.valueOf(fi).doubleValue();      Log.v("Doubles parsed", "ready for calculations");      //these are the problem statements       protein = 1.0;      carbs = 1.0;      fat = 1.0;      fiber = 1.0;       protein *= 16;      carbs *= 19;      fat *= 45;      fiber *= 14;       temp = protein + carbs + fat - fiber;      temp = temp/175;       points = new Integer((int) temp); 

Answer 1

I would do it this way:

try {   txtProt = (EditText) findViewById(R.id.Protein); // Same   p = txtProt.getText().toString(); // Same   protein = Double.parseDouble(p); // Make use of autoboxing.  It's also easier to read. } catch (NumberFormatException e) {   // p did not contain a valid double } 

EDIT: "the program force closes immediately without leaving any info in the logcat"

I don't know bout not leaving information in the logcat output, but a force-close generally means there's an uncaught exception - like a NumberFormatException.