CODEWITHSUNDEEP
androidandroid-edittext
XX_brother
XX_brother

Reputation: 1697

Let the EditText can input zero when zero is the first number

Now,my EditText only can input number.But I want to ban inputing zero when the zero is the first number. How can I do?

Upvotes: 5

Views: 4403

Answers (5)

Hardik Trivedi
Hardik Trivedi

Reputation: 6102

You can write logic using TextWatcher. Try to google for textwatcher.

To start off below is the code snippet.

<textboxobj>.addTextChangedListener(new TextWatcher() {
        public void afterTextChanged(Editable s) {
            // Nothing
        }
        public void beforeTextChanged(CharSequence s, int start, int count, int after) {
            // Nothing
        }
        public void onTextChanged(CharSequence s, int start, int before, int count) {
            // Write your stuff here
        }
    });

Upvotes: 0

Arjun G
Arjun G

Reputation: 646

I tried like this and it works fine!

  yourEditText.addTextChangedListener(new TextWatcher(){
                public void onTextChanged(CharSequence s, int start, int before, int count)
                {
//***  Use the below to lines ****
                    if (yourEditText.getText().startsWith("0") )
                        yourEditText.setText("");    
                }
                public void beforeTextChanged(CharSequence s, int start, int count, int after){}
                public void afterTextChanged(Editable s){}
            });

Upvotes: 0

waqaslam
waqaslam

Reputation: 68187

you can achieve this with a TextWatcher:

yourEditText.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) {
            String tmp = s.toString().trim();
            if(tmp.length()==1 && tmp.equals("0"))
                s.clear();
        }
    });

Upvotes: 0

Goofy
Goofy

Reputation: 6128

This will help u 

if(edittext.getText().toString().length()== 0 || Integer.valueOf(edittext.getText().toString())== 0){
                AlertDialog.Builder builder = new AlertDialog.Builder(this);
                builder.setMessage("Please enter atleast 1 as value");
                builder.setCancelable(true);
                builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {

                    @Override
                    public void onClick(DialogInterface dialog, int id) {
                        // TODO Auto-generated method stub
                            dialog.cancel();
                    }
                });
                builder.create().show();
            }

Upvotes: 1

Manitoba
Manitoba

Reputation: 8702

This should help you:

        yourTextEdit.addTextChangedListener(new TextWatcher(){
        public void onTextChanged(CharSequence s, int start, int before, int count)
        {
            if (yourTextEdit.getText().matches("^0") )
            {
                // Not allowed
                yourTextEdit.setText("");
            }
        }
        public void beforeTextChanged(CharSequence s, int start, int count, int after){}
        public void afterTextChanged(Editable s){}
    });

Upvotes: 6

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