How can I show in UI the limit of character and how much was digited for the user? Android Java

How can I do that? I mean showing the limit of character and how much was digited on the input text.

You can simply use TextInputLayout widget for this task in your xml,

<android.support.design.widget.TextInputLayout 
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    app:counterEnabled="true"
    app:counterMaxLength="50">

       <EditText
           android:layout_width="match_parent"
           android:layout_height="wrap_content"
           android:maxLength="50" />

</android.support.design.widget.TextInputLayout>

Here counterEnabled is to enable counter, and counterMaxLength sets the maximum range of counter.

While maxLength in EditText sets the maximum number of characters, can be enters in your EditText.