Getting decimal number from edittext

Question

I know something similar has already been asked, but I'm having some trouble to get a decimal number that come from keyboard.

My Java code in the onCreate method should be:

textS0 = (EditText)findViewById(R.id.editS0);
Button btn_S0 = (Button)findViewById(R.id.getS0);

btn_S0.setOnClickListener(new View.OnClickListener() 
{
    public void onClick(View v)
    {
        //how should I get here the number from keyboard?
        //I think  I should be something like
        //double S0=textS0.getText()....
    }
});

And that's what my XML file contains

<EditText
       android:id="@+id/editS0"
       android:layout_width="wrap_content"
       android:layout_height="wrap_content"
       android:ems="10"
       android:hint="@string/S0"
       android:inputType="numberDecimal" />
<Button
       android:id="@+id/getS0"
       android:layout_width="wrap_content"
       android:layout_height="wrap_content"
       android:text="@string/setS0" />
</LinearLayout>

You'll have to parse the string to a double: [`Double.parseDouble()`](http://docs.oracle.com/javase/6/docs/api/java/lang/Double.html#parseDouble(java.lang.String)) — Lukas Knuth, May 12 '13 at 11:15
when you do getText() it returns you String, just do a simple Double.parseDouble() to get your desired value — Chor Wai Chun, May 12 '13 at 11:15
try{Double.parseDouble(textS0.getText().toString())}catch(NumberFormatException e){e.printStacktrace();} — Raghunandan, May 12 '13 at 11:20
@ChorWaiChun, [`EditText.getText()`](http://developer.android.com/reference/android/widget/EditText.html#getText()) returns an [`Editable`](http://developer.android.com/reference/android/text/Editable.html) object that itself contains the content. You should call `EditText.getText().toString()` to retrieve the juicy String innards. — indivisible, Nov 15 '14 at 17:57

score 8 · Accepted Answer · answered May 12 '13 at 11:20

8

Just do this:

double S0 = Double.parseDouble(textS0.getText().toString());

answered May 12 '13 at 11:20

Bilbo Beggins

176
6

If string is empty, causes `java.lang.NumberFormatException: empty String`. https://stackoverflow.com/questions/21542079/java-lang-numberformatexception-empty-string – O-9 Jul 30 '19 at 12:26

score 3 · Answer 2 · answered May 12 '13 at 11:20

textS0=(EditText)findViewById(R.id.editS0);
Button btn_S0=(Button)findViewById(R.id.getS0);

btn_S0.setOnClickListener(new View.OnClickListener() 
{
public void onClick(View v)
{

           double S0 = Double.parseDouble(textS0.getText().toString());
}
});

score 0 · Answer 3 · answered Apr 03 '17 at 08:34

May b you face null pointer exception in string so try this....

get the number decimal from edittext using this

   Double BText=ParseDouble(String.valueOf(edittext.getText()));

after that paste this code.. it prevents you from null pointer exception

double ParseDouble(String strNumber) {
if (strNumber != null && strNumber.length() > 0) {
    try {
        return Double.parseDouble(strNumber);
    } catch(Exception e) {
        return -1;
    }
}
else return 0;
}

Getting decimal number from edittext

3 Answers3

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