How to detect if EditBox is empty

Question

Iam new to programming... still a beginner in Android...

I have a Login Activity, when I clikc submit it goes to another Activity. I have an EditBox which it enters. I want to detect if the EditBox is empty

If it is empty I want to avoid clicking a button which I am clicking using the etNumber.setOnFocusChangeListener(new View.OnFocusChangeListener()

This will save the data to a csv file...

The idea is that any empty editText will not be saved... and thus have empty lines in the csv...

you can retrieve EditText text length in your activity onCreate or onResume if it's length is zero then you can disable your button — Nik, Dec 27 '19 at 09:54

score 0 · Accepted Answer · edited Dec 27 '19 at 10:54

0

There are many ways to do it. But for the above problem statement the below code should work.

<Your EditText>.setOnFocusChangeListener(new OnFocusChangeListener() {

@Override
public void onFocusChange(View v, boolean hasFocus) {
    if(!editText.getText().toString().trim().isEmpty()){
         //Your code
    }
}
});

edited Dec 27 '19 at 10:54

Kushal

8,100
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answered Dec 27 '19 at 10:09

Pranjali Parnerkar

16
3

Thank you this seemed to work.... Thank you very much.,.. I used .isEmpty, but I din't use .trim I guess I should have tried it.. – Peter Fraga Dec 29 '19 at 03:04

score 0 · Answer 2 · answered Dec 27 '19 at 10:10

EditText editText  = (EditText) findViewById(R.id.edittext);
if(TextUtils.isEmpty(editText.getText().toString())) {
   Toast.makeText(MainActivity.this, "EditText is Empty", Toast.LENGTH_LONG).show();
 }
 else {
    Toast.makeText(MainActivity.this, "EditText is Not Empty", Toast.LENGTH_LONG).show();
 }

score 0 · Answer 3 · answered Dec 27 '19 at 11:27

If you are using Kotlin (which you should) then below 1 line statement uses the kotlin inline extension to check for the emptiness,

editText.text.isNotEmpty().apply { 
    //do something
 }

here editText is id of your edit text , which you can get with below code,

val editText= findViewById(R.id.et_message) as EditText

How to detect if EditBox is empty

3 Answers3