Lowercase input filter for username + validate on resume

auth/src/main/java/org/futo/circles/auth/feature/sign_up/username/UsernameFragment.kt

 package org.futo.circles.auth.feature.sign_up.username
 
 import android.os.Bundle
+import android.text.InputFilter
+import android.text.Spanned
 import android.view.View
 import androidx.core.widget.doAfterTextChanged
 import androidx.fragment.app.Fragment
@@ -9,11 +11,11 @@ import by.kirich1409.viewbindingdelegate.viewBinding
 import dagger.hilt.android.AndroidEntryPoint
 import org.futo.circles.auth.R
 import org.futo.circles.auth.databinding.FragmentUsernameBinding
+import org.futo.circles.core.base.fragment.HasLoadingState
+import org.futo.circles.core.base.fragment.ParentBackPressOwnerFragment
 import org.futo.circles.core.extensions.getText
 import org.futo.circles.core.extensions.observeData
 import org.futo.circles.core.extensions.observeResponse
-import org.futo.circles.core.base.fragment.HasLoadingState
-import org.futo.circles.core.base.fragment.ParentBackPressOwnerFragment
 
 @AndroidEntryPoint
 class UsernameFragment : ParentBackPressOwnerFragment(R.layout.fragment_username),
@@ -29,6 +31,11 @@ class UsernameFragment : ParentBackPressOwnerFragment(R.layout.fragment_username
         setupObservers()
     }
 
+    override fun onResume() {
+        super.onResume()
+        setContinueButtonEnabled()
+    }
+
     private fun setupViews() {
         with(binding) {
             btnSetUsername.setOnClickListener {
@@ -36,8 +43,18 @@ class UsernameFragment : ParentBackPressOwnerFragment(R.layout.fragment_username
                 viewModel.setUsername(tilUserName.getText())
             }
             tilUserName.editText?.doAfterTextChanged {
-                btnSetUsername.isEnabled = tilUserName.getText().isNotEmpty()
+                setContinueButtonEnabled()
             }
+            etUserName.filters = arrayOf<InputFilter>(object : InputFilter.AllCaps() {
+                override fun filter(
+                    source: CharSequence?,
+                    start: Int,
+                    end: Int,
+                    dest: Spanned?,
+                    dstart: Int,
+                    dend: Int
+                ) = source.toString().lowercase()
+            })
         }
     }
 
@@ -47,4 +64,9 @@ class UsernameFragment : ParentBackPressOwnerFragment(R.layout.fragment_username
             binding.tvServerDomain.text = it
         }
     }
+
+    private fun setContinueButtonEnabled() {
+        binding.btnSetUsername.isEnabled = binding.tilUserName.getText().isNotEmpty()
+    }
+
 }