How to determine if an input in EditText is an integer?

Question

Hi I\'m a newbie in Android Programming.

I\'m trying to build an activity which includes an edittext field and a button. When user type in an

Answer 1

You can use TextWatcher for EditText to get value of every change in EditText.You need to add interface of TextWatcher in your Activity.

 mEditText.addTextChangedListener(Your Class Name.this);

on in method of TextWatcher

     @Override
public void afterTextChanged(Editable s) {
    Log.v("Log_tag", "After TextChanged" + s.toString());

}

@Override
public void beforeTextChanged(CharSequence s, int start, int count,
        int after) {
    Log.i("Log_tag", "Before TextChanged" + s.toString());

}

@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
    Log.e("Log_tag", "ontext Changed" + s.toString());
    //you can match here s with number or integer 
             if(isNumeric( s.toString())){
                      //it is number     
               }
    }


 public static boolean isNumeric(String str)
 {
    return str.matches("-?\\d+(.\\d+)?");
  }