feat: add possibility to clear invite search field

react/features/invite/components/add-people-dialog/native/AddPeopleDialog.js

     Alert,
     FlatList,
     KeyboardAvoidingView,
+    Platform,
     SafeAreaView,
     TextInput,
     TouchableOpacity,
 
 type State = AbstractState & {
 
+    /**
+     * State variable to keep track of the search field value.
+     */
+    fieldValue: string,
+
     /**
      * True if a search is in progress, false otherwise.
      */
     defaultState = {
         addToCallError: false,
         addToCallInProgress: false,
+        fieldValue: '',
         inviteItems: [],
         searchInprogress: false,
         selectableItems: []
         this._keyExtractor = this._keyExtractor.bind(this);
         this._renderItem = this._renderItem.bind(this);
         this._renderSeparator = this._renderSeparator.bind(this);
+        this._onClearField = this._onClearField.bind(this);
         this._onCloseAddPeopleDialog = this._onCloseAddPeopleDialog.bind(this);
         this._onInvite = this._onInvite.bind(this);
         this._onPressItem = this._onPressItem.bind(this);
                             <TextInput
                                 autoCorrect = { false }
                                 autoFocus = { true }
+                                clearButtonMode = 'always' // iOS only
                                 onChangeText = { this._onTypeQuery }
                                 placeholder = {
                                     this.props.t(`inviteDialog.${placeholderKey}`)
                                 }
                                 ref = { this._setFieldRef }
-                                style = { styles.searchField } />
+                                style = { styles.searchField }
+                                value = { this.state.fieldValue } />
+                            { this._renderAndroidClearButton() }
                         </View>
                         <FlatList
                             ItemSeparatorComponent = { this._renderSeparator }
         return item.type === 'user' ? item.id || item.user_id : item.number;
     }
 
+    _onClearField: () => void
+
+    /**
+     * Callback to clear the text field.
+     *
+     * @returns {void}
+     */
+    _onClearField() {
+        this.setState({
+            fieldValue: ''
+        });
+
+        // Clear search results
+        this._onTypeQuery('');
+    }
+
     _onCloseAddPeopleDialog: () => void
 
     /**
      * @returns {void}
      */
     _onTypeQuery(query) {
+        this.setState({
+            fieldValue: query
+        });
+
         clearTimeout(this.searchTimeout);
         this.searchTimeout = setTimeout(() => {
             this.setState({
 
     _renderItem: Object => ?React$Element<*>
 
+    /**
+     * Renders a button to clear the text field on Android.
+     *
+     * NOTE: For the best platform experience we use the native solution on iOS.
+     *
+     * @returns {React#Element<*>}
+     */
+    _renderAndroidClearButton() {
+        if (Platform.OS !== 'android' || !this.state.fieldValue.length) {
+            return null;
+        }
+
+        return (
+            <TouchableOpacity
+                onPress = { this._onClearField }
+                style = { styles.clearButton }>
+                <View style = { styles.clearIconContainer }>
+                    <Icon
+                        name = 'close'
+                        style = { styles.clearIcon } />
+                </View>
+            </TouchableOpacity>
+        );
+    }
+
     /**
      * Renders a single item in the {@code FlatList}.
      *

react/features/invite/components/add-people-dialog/native/styles.js

 export const LIGHT_GREY = 'rgb(209, 219, 232)';
 export const ICON_SIZE = 15;
 
+const FIELD_COLOR = 'rgb(240, 243, 247)';
+
 export default {
     avatar: {
         backgroundColor: LIGHT_GREY
         flex: 1
     },
 
+    clearButton: {
+        alignItems: 'center',
+        justifyContent: 'center',
+        marginLeft: 5
+    },
+
+    clearIcon: {
+        color: DARK_GREY,
+        fontSize: 18,
+        textAlign: 'center'
+    },
+
+    clearIconContainer: {
+        alignItems: 'center',
+        backgroundColor: FIELD_COLOR,
+        borderRadius: 12,
+        justifyContent: 'center',
+        height: 24,
+        width: 24
+    },
+
     dialogWrapper: {
         alignItems: 'stretch',
         backgroundColor: ColorPalette.white,
     },
 
     searchField: {
-        backgroundColor: 'rgb(240, 243, 247)',
+        backgroundColor: FIELD_COLOR,
         borderBottomRightRadius: 10,
         borderTopRightRadius: 10,
         color: DARK_GREY,
 
     searchIconWrapper: {
         alignItems: 'center',
-        backgroundColor: 'rgb(240, 243, 247)',
+        backgroundColor: FIELD_COLOR,
         borderBottomLeftRadius: 10,
         borderTopLeftRadius: 10,
         flexDirection: 'row',