Use TextView.doOnTextChanged() extension.

app/src/main/java/org/schabi/newpipe/local/subscription/dialog/FeedGroupDialog.kt

@@ -3,9 +3,7 @@ package org.schabi.newpipe.local.subscription.dialog
 import android.app.Dialog
 import android.os.Bundle
 import android.os.Parcelable
-import android.text.Editable
 import android.text.TextUtils
-import android.text.TextWatcher
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
@@ -15,6 +13,7 @@ import androidx.core.content.getSystemService
 import androidx.core.os.bundleOf
 import androidx.core.view.isGone
 import androidx.core.view.isVisible
+import androidx.core.widget.doOnTextChanged
 import androidx.fragment.app.DialogFragment
 import androidx.lifecycle.Observer
 import androidx.lifecycle.ViewModelProvider
@@ -194,16 +193,11 @@ class FeedGroupDialog : DialogFragment(), BackPressable {
         }
 
         group_name_input_container.error = null
-        group_name_input.addTextChangedListener(object : TextWatcher {
-            override fun afterTextChanged(s: Editable?) {}
-            override fun beforeTextChanged(s: CharSequence?, start: Int, count: Int, after: Int) {}
-
-            override fun onTextChanged(s: CharSequence?, start: Int, before: Int, count: Int) {
-                if (group_name_input_container.isErrorEnabled && !s.isNullOrBlank()) {
-                    group_name_input_container.error = null
-                }
+        group_name_input.doOnTextChanged { text, _, _, _ ->
+            if (group_name_input_container.isErrorEnabled && !text.isNullOrBlank()) {
+                group_name_input_container.error = null
             }
-        })
+        }
 
         confirm_button.setOnClickListener { handlePositiveButton() }
 
@@ -245,15 +239,11 @@ class FeedGroupDialog : DialogFragment(), BackPressable {
             }
         }
 
-        toolbar_search_edit_text.addTextChangedListener(object : TextWatcher {
-            override fun beforeTextChanged(s: CharSequence, start: Int, count: Int, after: Int) = Unit
-            override fun afterTextChanged(s: Editable) = Unit
-            override fun onTextChanged(s: CharSequence, start: Int, before: Int, count: Int) {
-                val newQuery: String = toolbar_search_edit_text.text.toString()
-                subscriptionsCurrentSearchQuery = newQuery
-                viewModel.filterSubscriptionsBy(newQuery)
-            }
-        })
+        toolbar_search_edit_text.doOnTextChanged { _, _, _, _ ->
+            val newQuery: String = toolbar_search_edit_text.text.toString()
+            subscriptionsCurrentSearchQuery = newQuery
+            viewModel.filterSubscriptionsBy(newQuery)
+        }
 
         subscriptionGroupAdapter.setOnItemClickListener(subscriptionPickerItemListener)
     }