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

User · Answer

You seem to assign Double object into native double value field  Does that really compile   Double valueOf   creates a Double object so  doubleValue   should not be necessary   If you want native double field  you need to define the field as double and then use  doubleValue

User · Answer

try this    double d  Double parseDouble yourString

User · Answer

kw  EditText findViewById R id kw       btn  Button findViewById R id btn       cost  TextView  findViewById R id cost                 btn setOnClickListener new View OnClickListener              Override         public void onClick View v    cst    Double valueOf kw getText   toString                 cst   cst 0 551              cost setText cst toString

User · Answer

String sc1  0 0   Double s1 Double parseDouble sc1 toString

User · Answer

I had the same issue  but I have just figured out that     parsing the EditText value in the Oncreate method caused the app to crash because when the app starts  there are no values to parse or maybe the placeholders which are letter    My code    package com example herodav volumeapp   import android renderscript Double2  import android support v7 app AppCompatActivity  import android os Bundle  import android view    import android widget     import org w3c dom Text   public class MainActivity extends AppCompatActivity        EditText height  length  depth      TextView volume      double h l d vol         Override     protected void onCreate Bundle savedInstanceState            super onCreate savedInstanceState           setContentView R layout activity main            height    EditText findViewById R id h           length    EditText findViewById R id l           depth    EditText findViewById R id d           volume    TextView findViewById R id v            Button btn    Button findViewById R id btn           btn setOnClickListener new View OnClickListener                  Override             public void onClick View v                    calculateVolume                    volume setText  Volume       String valueOf vol                                         public void calculateVolume            h   Double parseDouble height getText   toString             l   Double parseDouble length getText   toString             d   Double parseDouble depth getText   toString             vol   h l d            I

User · Answer

What about using the Double String  constructor  So   protein   new Double p     Don t know why it would be different  but might be worth a shot

User · Answer

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

User · Answer

i have a similar problem  for correct formatting EditText text content to double value i use this code   try           String eAm   etAmount getText   toString            DecimalFormat dF   new DecimalFormat  0 00            Number num   dF parse eAm           mPayContext amount   num doubleValue          catch  Exception e            mPayContext amount   0 0d          this is independet from current phone locale and return correct double value   hope it s help

[android] Converting String to Double in Android

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