Add a trick to reset EditText field when recycled.

vector/src/main/java/im/vector/app/core/utils/ReadOnce.kt

@@ -0,0 +1,45 @@
+/*
+ * Copyright (c) 2020 New Vector Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package im.vector.app.core.utils
+
+import java.util.concurrent.atomic.AtomicBoolean
+
+/**
+ * Use this container to read a value only once
+ */
+class ReadOnce<T>(
+        private val value: T
+) {
+    private val valueHasBeenRead = AtomicBoolean(false)
+
+    fun get(): T? {
+        return if (valueHasBeenRead.getAndSet(true)) {
+            null
+        } else {
+            value
+        }
+    }
+}
+
+/**
+ * Only the first call to isTrue() will return true
+ */
+class ReadOnceTrue {
+    private val readOnce = ReadOnce(true)
+
+    fun isTrue() = readOnce.get() == true
+}

vector/src/main/java/im/vector/app/features/discovery/SettingsEditTextItem.kt

@@ -32,6 +32,7 @@ import im.vector.app.core.extensions.setTextOrHide
 abstract class SettingsEditTextItem : EpoxyModelWithHolder<SettingsEditTextItem.Holder>() {
 
     @EpoxyAttribute var hint: String? = null
+    @EpoxyAttribute var value: String? = null
     @EpoxyAttribute var descriptionText: String? = null
     @EpoxyAttribute var errorText: String? = null
     @EpoxyAttribute var inProgress: Boolean = false
@@ -70,6 +71,9 @@ abstract class SettingsEditTextItem : EpoxyModelWithHolder<SettingsEditTextItem.
 
         holder.editText.doOnTextChanged(textChangeListener)
         holder.editText.setOnEditorActionListener(editorActionListener)
+        if (value != null) {
+            holder.editText.setText(value)
+        }
     }
 
     class Holder : VectorEpoxyHolder() {

vector/src/main/java/im/vector/app/features/settings/threepids/ThreePidsSettingsController.kt

@@ -136,6 +136,9 @@ class ThreePidsSettingsController @Inject constructor(
                     id("addingEmail")
                     inputType(InputType.TYPE_CLASS_TEXT or InputType.TYPE_TEXT_VARIATION_EMAIL_ADDRESS)
                     hint(stringProvider.getString(R.string.medium_email))
+                    if (data.editTextReinitiator?.isTrue() == true) {
+                        value("")
+                    }
                     errorText(data.state.error)
                     interactionListener(object : SettingsEditTextItem.Listener {
                         override fun onValidate() {
@@ -196,6 +199,9 @@ class ThreePidsSettingsController @Inject constructor(
                     id("addingMsisdn")
                     inputType(InputType.TYPE_CLASS_PHONE)
                     hint(stringProvider.getString(R.string.medium_phone_number))
+                    if (data.editTextReinitiator?.isTrue() == true) {
+                        value("")
+                    }
                     errorText(data.state.error)
                     interactionListener(object : SettingsEditTextItem.Listener {
                         override fun onValidate() {
@@ -257,6 +263,9 @@ class ThreePidsSettingsController @Inject constructor(
                     id("msisdnVerification${threePid.value}")
                     inputType(InputType.TYPE_CLASS_NUMBER)
                     hint(stringProvider.getString(R.string.settings_text_message_sent_hint))
+                    if (data.msisdnValidationReinitiator[threePid]?.isTrue() == true) {
+                        value("")
+                    }
                     errorText(getCodeError(data, threePid))
                     interactionListener(object : SettingsEditTextItem.Listener {
                         override fun onValidate() {

vector/src/main/java/im/vector/app/features/settings/threepids/ThreePidsSettingsViewModel.kt

@@ -29,6 +29,7 @@ import im.vector.app.R
 import im.vector.app.core.extensions.exhaustive
 import im.vector.app.core.platform.VectorViewModel
 import im.vector.app.core.resources.StringProvider
+import im.vector.app.core.utils.ReadOnceTrue
 import kotlinx.coroutines.launch
 import org.matrix.android.sdk.api.MatrixCallback
 import org.matrix.android.sdk.api.auth.data.LoginFlowTypes
@@ -124,7 +125,15 @@ class ThreePidsSettingsViewModel @AssistedInject constructor(
                 .livePendingThreePIds()
                 .execute {
                     copy(
-                            pendingThreePids = it
+                            pendingThreePids = it,
+                            // Ensure the editText for code will be reset
+                            msisdnValidationReinitiator = msisdnValidationReinitiator.toMutableMap().apply {
+                                it.invoke()
+                                        ?.filterIsInstance(ThreePid.Msisdn::class.java)
+                                        ?.forEach { threePid ->
+                                            getOrPut(threePid) { ReadOnceTrue() }
+                                        }
+                            }
                     )
                 }
     }
@@ -177,7 +186,8 @@ class ThreePidsSettingsViewModel @AssistedInject constructor(
     private fun handleChangeState(action: ThreePidsSettingsAction.ChangeState) {
         setState {
             copy(
-                    state = action.newState
+                    state = action.newState,
+                    editTextReinitiator = ReadOnceTrue()
             )
         }
     }

vector/src/main/java/im/vector/app/features/settings/threepids/ThreePidsSettingsViewState.kt

@@ -19,6 +19,7 @@ package im.vector.app.features.settings.threepids
 import com.airbnb.mvrx.Async
 import com.airbnb.mvrx.MvRxState
 import com.airbnb.mvrx.Uninitialized
+import im.vector.app.core.utils.ReadOnceTrue
 import org.matrix.android.sdk.api.session.identity.ThreePid
 
 data class ThreePidsSettingsViewState(
@@ -26,5 +27,7 @@ data class ThreePidsSettingsViewState(
         val isLoading: Boolean = false,
         val threePids: Async<List<ThreePid>> = Uninitialized,
         val pendingThreePids: Async<List<ThreePid>> = Uninitialized,
-        val msisdnValidationRequests: Map<String, Async<Unit>> = emptyMap()
+        val msisdnValidationRequests: Map<String, Async<Unit>> = emptyMap(),
+        val editTextReinitiator: ReadOnceTrue? = null,
+        val msisdnValidationReinitiator: Map<ThreePid, ReadOnceTrue> = emptyMap()
 ) : MvRxState