CODEWITHSUNDEEP
androidandroid-edittext
MD.MD
MD.MD

Reputation: 718

how to get number from editText?

I want to get a number from editText and use in a calculation, there is no any error in my code but I didn't get what I looking for, the value of r is alwayas 1, here is the code:

public class Counter extends Activity {

    Button add, sub;
    TextView result;
    EditText range;
    double r;
    public double c=0;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_counter);

        add = (Button) this.findViewById(R.id.add);
        sub = (Button) this.findViewById(R.id.sub);
        result = (TextView) this.findViewById(R.id.result);
        range = (EditText) this.findViewById(R.id.range);

        try {
            r = new Double(range.getText().toString());
        } catch (NumberFormatException e) {
            r = 1; // your default value
        }

        add.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                c=c+r;
                result.setText(""+c);

            }
        }); 

        sub.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                c=c-r;
                result.setText(""+c);
            }
        });
    }

any help ??

Upvotes: 0

Views: 444

Answers (8)

wael
wael

Reputation: 454

you can make your editText in the XML file so that it accepts only numbers 

android:inputType="number"

and in your java code 

r = Double.parseDouble(range.getText().toString());

Upvotes: 0

Pablo Francisco Pérez Hidalgo
Pablo Francisco Pérez Hidalgo

Reputation: 27702

Double class provides a static method which parses a string to double.

So try to change:

 r = new Double(range.getText().toString());

To:

 r = Double.parseDouble(range.getText().toString());

Additionally, you may want to parse other strings to other types of numbers such as integers:

 int x = Integer.parseInt(yourString);

Upvotes: 2

Kaschwenk
Kaschwenk

Reputation: 622

Try this one: Just in case there is the possibility that the String from the EditText cannot be parsed to a double I have put it inside a try-catch block.

double r;
try {
    r =  Double.parseDouble(range.getText().toString());
catch (NumberFormatException ex) {
    r = 1;
}

Hope this helps :)

Upvotes: 0

prakash
prakash

Reputation: 1413

use like that:

r=Double.parseDouble(range.getText().toString());

Upvotes: 0

Blackbelt
Blackbelt

Reputation: 157457

        try {
            r = new Double(range.getText().toString());
        } catch (NumberFormatException e) {
            r = 1; // your default value
        }

the snippet of code you posted is correct. Double has a constructor that takes a String . The problem is that you are executing it after your findViewById and probably the EditText does not contain nothing. For instance when you press on add, you can retrieve the content of the EditText again and parse it:

  add.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            try {
              r = new Double(range.getText().toString());
            } catch (NumberFormatException e) {
              r = 1; // your default value
             }
            c=c+r;
            result.setText(""+c);

        }
    });

Upvotes: 3

ucsunil
ucsunil

Reputation: 7494

You just need to do:

r = Double.parseDouble(range.getText().toString()); // Surround with try/catch for fancy functionality

Upvotes: 0

Dan Harms
Dan Harms

Reputation: 4840

You need to use Double.parseDouble(range.getText().toString());

Upvotes: 0

Unii
Unii

Reputation: 1617

Try this (parsing string to double):

r = Double.parseDouble(range.getText().toString());

you should get value from EditText when user will click on button when you will get value only in onCreate() it will be take data from EditText when it will be created

Upvotes: 0

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