CODEWITHSUNDEEP
androidandroid-edittexttextwatcher
Zala Janaksinh
Zala Janaksinh

Reputation: 2927

How to Apply the Textchange event on EditText

I developed one simple app, like subtraction, addition. In this app I use three EditTexts, one for answer and other two for question. I want to calculate the answer of question on text change event. But when I apply the text change event on both of this the event occur but not properly work. Because when I enter in the text in first EditText of question the event occur but it throws this exception:

07-03 16:39:48.844: E/EduApp Log :=>(12537): Error In Text change Event java.lang.NumberFormatException: unable to parse '' as integer

What do I do? I use the TextWatcher for text change event.

txtOne.addTextChangedListener(this);
txtTwo.addTextChangedListener(this);

public void afterTextChanged(Editable s) {}

public void beforeTextChanged(CharSequence s, int start, int count, int after) {}

public void onTextChanged(CharSequence s, int start, int before, int count) {}

Upvotes: 29

Views: 78976

Answers (7)

Aftab Alam
Aftab Alam

Reputation: 2049

For Kotlin use this below code

edit1.addTextChangedListener(object : TextWatcher {
   override fun onTextChanged(s: CharSequence, start: Int, before: Int, count: Int) {
       if (edit1.text.toString().length == 1) {
             edit2.requestFocus()
       }
   }

   override fun beforeTextChanged(s: CharSequence, start: Int, count: Int, after: Int
   ) {// TODO Auto-generated method stub
   }

   override fun afterTextChanged(s: Editable) {}
})

Upvotes: 0

AndroidHV
AndroidHV

Reputation: 369

I had the same issue and the problem was solved with these 2 actions:
1 - android:inputType="textNoSuggestions" (it did not solve the problem itself)
2 - adding the listener: 

edittext1.addTextChangedListener(new TextWatcher() {

            public void onTextChanged(CharSequence s, int start, int before,
            int count) {

                Log.e("JFT", "EDITTEXT => = "+s);
                if(!s.equals("") ) {
                    //do your work here
                }
            }



            public void beforeTextChanged(CharSequence s, int start, int count,
            int after) {

            }

            public void afterTextChanged(Editable s) {

            }
        });

Upvotes: 0

Hitesh Sahu
Hitesh Sahu

Reputation: 45052

Added Kotlin implementation for future reference

 webUrl.editText!!.addTextChangedListener(object : TextWatcher {
            override fun afterTextChanged(s: Editable?) {
            }

            override fun beforeTextChanged(s: CharSequence?, start: Int, count: Int, after: Int) {
            }

            override fun onTextChanged(s: CharSequence?, start: Int, before: Int, count: Int) {

                var urlToload: String
                if (s ==null || s.isEmpty()) {
                    urlToload = UniversalWebViewFragment.YOUTUBE_SERACH_URL + "hd trailers"
                } else {
                    urlToload = UniversalWebViewFragment.GOOGLE_SERACH_URL + s.toString()
                }

                loadURL(urlToload)
            }

        })

Upvotes: 0

Andro Selva
Andro Selva

Reputation: 54322

I think you are receiving empty String " " which is causing this problem. Make sure you get a non-empty String from your EditText.

Consider your EditText doesn't have any value typed in, and you are trying to get its value and convert into int you will run into this kind of problem. 

edittext.addTextChangedListener(new TextWatcher() {

    public void onTextChanged(CharSequence s, int start, int before,
            int count) {
            if(!s.equals("") ) { 
                //do your work here 
            }
    }



    public void beforeTextChanged(CharSequence s, int start, int count,
            int after) {

    }

    public void afterTextChanged(Editable s) {

    }
});

Also check this link for more idea,

https://stackoverflow.com/a/3377648/603744

Upvotes: 51

user6757534
user6757534

Reputation: 201

i think the best in case the edittext type is number... use the (length function) of parameter instead of (equle() function) ex:

edittext.addTextChangedListener(new TextWatcher() {

    public void onTextChanged(CharSequence s, int start, int before,
            int count) {
        if (s.length() > 0)
                { //do your work here }
        }

    }

    public void beforeTextChanged(CharSequence s, int start, int count,
            int after) {

    }

    public void afterTextChanged(Editable s) {

    }
});

Upvotes: 2

Omid
Omid

Reputation: 19

I used this and it's correct:

public void afterTextChanged(Editable arg0) {
    String inputs = input.getText().toString();
    Integer index=0;
    if(!inputs.equals("")) 
        index=Integer.valueOf(inputs);

}

Upvotes: 1

myo htet aung
myo htet aung

Reputation: 107

I think you need to check your editText value is empty or not first. Something like this:

String textValue;
textValue = edittext().getText().toString());
Log.v("","Value is " + textValue);
if(textValue != ""){
   // Call Text Change Listener Here
}else{
   // Throw error message or something
}

Hope it's help.

Upvotes: 0

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