How to check EditText isEmpty in Android

Question

I want to create a login page, I used EditText to insert user info. I want to check EditText to see if it is Empty Invisible login Button, when inserted any character with user visible Login Button.
I tried the code shown below, but it did not not work for me :

//Show Login Button
String login_phoneString = login_PhoneText.getText().toString().trim();
if (login_phoneString.isEmpty()) {
    login_image.setVisibility(View.INVISIBLE);
} else {
    login_image.setVisibility(View.VISIBLE);
}

When EditText is empty, the button is invisible, and when set character in EditText again the login button is not shown.

How can I fix this problem ?

Possible duplicate of [(Android) Check if EditText is empty?](http://stackoverflow.com/questions/24391809/android-check-if-edittext-is-empty) — Nongthonbam Tonthoi, May 28 '16 at 12:28
try to use `TextWatcher()` on your `EditText` as per the answer by Phan Van Linh — ELITE, May 28 '16 at 12:29

Linh · Accepted Answer · 2016-05-28T12:29:44.360

You want to show/hide the Login button base on the text of EditText so you need to listen for changing in EditText by use TextWatcher.
Use this code inside onCreate() method

login_PhoneText.addTextChangedListener(new TextWatcher() {

        public void afterTextChanged(Editable s) {
            String login_phoneString = login_PhoneText.getText().toString().trim();
            if (login_phoneString.isEmpty()) {
                login_image.setVisibility(View.INVISIBLE);
            } else {
                login_image.setVisibility(View.VISIBLE);
            }
        }
        public void beforeTextChanged(CharSequence s, int start, int count, int after) {}

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

Skizo-ozᴉʞS ツ · Answer 2 · 2016-05-28T12:30:10.437

Using trim()

if(et.getText().toString().trim().length() == 0) //empty

Using TextUtils

if(TextUtils.isEmpty(et.getText().toString().trim()) //Empty

Using isEmpty()

if(et.getText().toString().isEmpty()) //Empty

EDIT

You can do this :

//Show Login Button
String login_phoneString = login_PhoneText.getText().toString().trim();
if (TextUtils.isEmpty(login_phoneString) {
   login_image.setVisibility(View.INVISIBLE);
} else {
   login_image.setVisibility(View.VISIBLE);
}

score 0 · Answer 3 · answered May 28 '16 at 12:18

Try to check like this way

    EditText edt = (EditText) findViewById(R.id.edittext);
    String abc = edt.getText().toString();
    if (abc.matches("")) {
        Toast.makeText(this, "enter something", Toast.LENGTH_SHORT).show();
        login_image.setVisibility(View.INVISIBLE);
        return;
    }
    else
    {
      login_image.setVisibility(View.VISIBLE);
     }

score 0 · Answer 4 · answered May 28 '16 at 12:20

String login_phoneString = login_PhoneText.getText().toString().trim();
if (login_phoneString.equals("")) {
    login_image.setVisibility(View.GONE);
} else {
    login_image.setVisibility(View.VISIBLE);
}

Use View.GONE instead of INVISIBLE. when INVISIBLE it is still clickable.

Nongthonbam Tonthoi · Answer 5 · 2016-05-28T12:23:50.137

0

Use TextUtils.isEmpty():

if (TextUtils.isEmpty(yourEditText.getText().toString())) {
    //Empty
} else {
    //Not empty
}

edited May 28 '16 at 12:23

answered May 28 '16 at 12:22

Nongthonbam Tonthoi

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Then your problem is somewhere else – Nongthonbam Tonthoi May 28 '16 at 12:24
`if (TextUtils.isEmpty(login_PhoneText.getText().toString())) { login_image.setVisibility(View.INVISIBLE); } else { login_image.setVisibility(View.VISIBLE); }` not work – Mohammad Nouri May 28 '16 at 12:24

How to check EditText isEmpty in Android

5 Answers5

EDIT