Application crashes when setting the text of an EditText

Question

Why does my application always crash whenever I try to change the text of an EditText? I have tried celc = (EditText) findViewById(R.id.cel) ; far = (EditText) findViewById(R.id.fa) ; Ran = (EditText) findViewById(R.id.ran) ; kelvin = (EditText) findViewById(R.id.kev) ;
celc.addTextChangedListener(new TextWatcher() {

        @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) {
            // TODO Auto-generated method stub

        }

        @Override
        public void beforeTextChanged(CharSequence s, int start, int count,
                int after) {
            // TODO Auto-generated method stub

        }

        @Override
        public void afterTextChanged(Editable s) {
            // TODO Auto-generated method stub
            String value = s.toString() ;
            double c1 = Double.parseDouble(value) ; 
            double f1 = (32+((9.0/5)*c1));
            double r1 = f1+460 ; 
            double k1 = c1 + 273.0 ;

            far.setText(f1+"");
            Ran.setText((r1 + "")); 
            kelvin.setText(k1+""); 

        }
    }); but it doesn't work.

How the heck are we supposed to know with neither code no stack trace? So I'll go with "the gremlins did it". — Gabe Sechan, Sep 25 '15 at 22:54
Please provide a [minimal, complete, and verifiable example](http://stackoverflow.com/help/mcve) demonstrating your problem. In this case, please post [the Java stack trace associated with your crash](https://stackoverflow.com/questions/23353173/unfortunately-myapp-has-stopped-how-can-i-solve-this), along with the code referenced in the stack trace. — CommonsWare, Sep 25 '15 at 23:04

score 3 · Accepted Answer · answered Sep 26 '15 at 08:44

Declare the EditText in the xml file
Find the EditText in the activity
Set the text in the EditText

And If you check the docs for EditText, you'll find a setText() method. It takes in a String and a TextView.BufferType. For example:

EditText editText =     (EditText)findViewById(R.id.edit_text);
editText.setText("Google is your friend.", TextView.BufferType.EDITABLE);

Or Use +, the string concatenation operator:

 ed = (EditText) findViewById (R.id.box);
    int x = 10;
    ed.setText(""+x);

or

String.valueOf(int):
ed.setText(String.valueOf(x))

score 0 · Answer 2 · answered Sep 26 '15 at 00:44

Maybe you dont have linked your view object with your java object.

You made this with findViewById method.

your layout file:

<EditText ... android:id="@+id/edittext" />

Java Code: on class definition:

private EditText myEditText;

and on method onCreate:

        edittext = (EditText) findViewById(R.id.editText);

Best regards!

Application crashes when setting the text of an EditText

2 Answers2