CODEWITHSUNDEEP
androidandroid-edittexttextview
Android Newbie
Android Newbie

Reputation: 103

How to get a number from a TextView that also has Strings

I have two TextView's that display averages from couple of EditText boxes and display them as "My Avg: 245" and the other Textview has "My Avg: 145". I'm calculating the avg in these two TextView's on a button click and setting the text of the button to the answer. How do I get only the number from both the text view? Because when call Double.parseDouble() on the TextView, I'm getting an error. Any help would be appreciated, thanks. enter image description here

Upvotes: 0

Views: 1791

Answers (4)

Jaiprakash Soni
Jaiprakash Soni

Reputation: 4112

Get String from all EditText and extract number from string using Regex. Check below example:

String str = "My Avg: 145";
Pattern pattern = Pattern.compile("(\\d+)");
Matcher m = pattern.matcher( str );

if( m.find() ){
    String i=m.group(); 
    System.out.println( "-->>" + i);
}

Here 

\d means one digit 
\d+ means one or more digits
() means capture that group

This regrx will give you first group of digits in your string. You can parse i using double.parse();

Upvotes: 3

Ringo
Ringo

Reputation: 838

What do you mean by calculating the average in the textview? wherever you do that calculation you should be able to access the values, trying to parse the value from the textview is not a very good practice.

Share your code and the error you are getting, i'm guessing that you are trying to parse the value with the complete string of the textview and, as you can imagine, is not possible to get the Double value from a String.

If the String My avg: never changes, then you split this string from the ":" symbol and trim the value.

String text = "My avg: 245";

String numberString = text.split(":")[1];
Double number = Double.parseDouble(numberString);

System.out.println(number);

the output is:

245.0

I insist that you should not this approach, if the text changes by any reason, your app will break.

Upvotes: 2

N Kaushik
N Kaushik

Reputation: 2208

You can get number from text view like following :

String textView = tv.getText().toString();

if (!textView.equals("") && !textView.equals(......)) {
    int num = Integer.parseInt(textView);//extract number from text view  
}

Upvotes: 2

pratZ
pratZ

Reputation: 3346

You can not directly call Double#parseDouble on a String as it might throw NumberFormatException if its not a number.

So, you will have to get the number out of it first. You can do it by using String#split.

Get the String using the TextView#getText()

The split the text using,

String[] val =  textViewText.split(":");

This will return an array, you can then call Double.parseDouble,

double num = Double.parseDouble(val[1].trim());

Upvotes: 1

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