The TextInputLayout has a character counter for an EditText defined within it.
The counter will be rendered below the EditText.
Just use the [setCounterEnabled()](<https://developer.android.com/reference/android/support/design/widget/TextInputLayout.html#setCounterEnabled(boolean)>)
and [setCounterMaxLength](<https://developer.android.com/reference/android/support/design/widget/TextInputLayout.html#setCounterMaxLength(int)>)
methods:
TextInputLayout til = (TextInputLayout) findViewById(R.id.username);
til.setCounterEnabled(true);
til.setCounterMaxLength(15);
or the [app:counterEnabled](<https://developer.android.com/reference/android/support/design/widget/TextInputLayout.html#attr_android.support.design:counterEnabled>)
and [app:counterMaxLength](<https://developer.android.com/reference/android/support/design/widget/TextInputLayout.html#attr_android.support.design:counterMaxLength>)
attributes in the xml.
<android.support.design.widget.TextInputLayout
app:counterEnabled="true"
app:counterMaxLength="15">
<EditText/>
</android.support.design.widget.TextInputLayout>