android - How to change EditText background color when I enter text?

Question

My EditText has some color, but when I enter some text it should change. Say it's grey, I started to enter and it's yellow. This EditText is also focused, so when this activity starts -- I already can enter the text. How I tried:

<style name="LoginEnterField">
    <item name="android:textColorHint">@color/black</item>
    <item name="android:textColor">@color/black</item>
    <item name="android:background">@drawable/selector_edittext</item>
    <item name="android:textSize">@dimen/general_text_size</item>
    <item name="android:paddingLeft">@dimen/activity_inner_horizontal_margin</item>
    <item name="android:paddingRight">@dimen/activity_inner_horizontal_margin</item>
</style>

<shape xmlns:android="http://schemas.android.com/apk/res/android"

    android:shape="rectangle">
    <solid android:color="@color/grey"/>
    <corners android:radius="5dp" />

</shape>

<shape xmlns:android="http://schemas.android.com/apk/res/android"

  android:shape="rectangle">
  <solid android:color="@color/yellow"/>
  <corners android:radius="5dp" />

</shape>

<selector xmlns:android="http://schemas.android.com/apk/res/android">
  <item android:state_focused="true" android:drawable="@drawable/roundbox_active_style"/>
  <item android:drawable="@drawable/roundbox_inactive_style" />
</selector>

I think the point is in this selector. My EditText changes color, but it always yellow. How to make it became yellow only if I enter some text? I can't make any code changes! It's very important. I can't add or change only xml files.

EDIT: It's impossible to do from xml only, so make code changes.

Answer 1

Try this use addTextChangedListener

addTextChangedListener(TextWatcher watcher)

Adds a TextWatcher to the list of those whose methods are called whenever this editText's text changes.

editText.addTextChangedListener(new TextWatcher() {
            @Override
            public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {

            }

            @Override
            public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {
                if (!editText.getText().toString().trim().isEmpty()) {
                    editText.setBackgroundColor(ContextCompat.getColor(Main2Activity.this, R.color.colorPrimary));
                } else {
                    editText.setBackgroundColor(ContextCompat.getColor(Main2Activity.this, R.color.colorPrimaryDark));
                }
            }

            @Override
            public void afterTextChanged(Editable editable) {

            }
        });