CODEWITHSUNDEEP
android
stack Learner
stack Learner

Reputation: 1348

How to enforce editText not to start with space

I have a edit Text.I don't want the first letter to be space. If user hit the space as first letter cursor should not move.

Upvotes: 8

Views: 6713

Answers (5)

Beena
Beena

Reputation: 2354

You can set InputFilter to your Edittext by following method. It will restrict user to enter space in starting.

 InputFilter filter = new InputFilter() {
        public CharSequence filter(CharSequence source, int start, int end,
                                   Spanned dest, int dstart, int dend) {
            if (source.length()>0 &&Character.isWhitespace(source.charAt(0)) && yourEditText.getText().toString().length()==0) {
                return "";
            }
            return source;
        }
    };
yourEditText.setFilters(new InputFilter[] { filter });

InputFilter is more reliable in terms of performance as compared to TextWatcher in this scenario. You can refer https://stackoverflow.com/a/33855940/3817374 for more detailed informarion.

Upvotes: 1

Rehan
Rehan

Reputation: 3285

Create a TextWatcher like this

public class MyTextWatcher implements TextWatcher {
    private EditText editText;

    public MyTextWatcher(EditText editText) {
        this.editText = editText;
    }

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

    }

    @Override
    public void onTextChanged(CharSequence s, int start, int before, int count) {
        String text = editText.getText().toString();
        if (text.startsWith(" ")) {
            editText.setText(text.trim());
        }
    }

    @Override
    public void afterTextChanged(Editable s) {

    }
}

And add this to your EditText

editText.addTextChangedListener(new MyTextWatcher(editText));

Upvotes: 10

Asama
Asama

Reputation: 385

Basing on the first answer by Luca:

TextWatcher mWatcher = new TextWatcher() { 
@Override public void afterTextChanged(Editable editable) {
 if (myEditText.getText().toString().startsWith(" ")) 
myEditText.setText(""); 
}

Here I changed equals to startsWith Than set it

Upvotes: 4

Nitish Dash
Nitish Dash

Reputation: 17

Add an if else condition to check the first letter

if(EditText.getText().charAt(0)!=" "){
//COOL!
}
else
{
//ERROR!
}

Make sure that it is run on the ui thread

Upvotes: -1

Luca Nicoletti
Luca Nicoletti

Reputation: 2397

TextWatcher myWatcher = new TextWatcher() {
 @Override
        public void afterTextChanged(Editable s) {
            if (myEditText.getText().toString().equals(" "))
              myEditText.setText("");
        }

and then 

myEditText.addTextChangedListener(myWatcher);

Upvotes: 1

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