How to resolve the Virtualized Lists warning with multiple Flatlists within a scroll - react-native

Question

I have been working my way through legacy views within an app - resolving the issues of FlatLists within a ScrollView component casuing the resulting Virtualised Lists error that is displayed.
I have 5 affected pages - first 3 only had 1 flatlist in the view - so was easy enough to split the urrounding code into flatlist header and footer assets. However I'm not sure what to do in terms of having 2 or more flatlists - how do i apprach the layout in thsi scenario - so there is only 1 scroll?
I may be missing something very simple but need a nudge please!
here is the view code:
<View style={[PRStyles.IRContainer]} >
<StatusBar barStyle="light-content" />
<View style={PRStyles.header}>
<FixedHeader backButton={true} navScreen='HomeViewContainer' />
</View>
<View style={PRStyles.IRBody}>
<ScrollView
refreshControl={
<RefreshControl
refreshing={this.state.refreshing}
onRefresh={this._onRefresh} />}>
<KeyboardAvoidingView>
<TitleHeader sectionLocaleTxt='Duty Record' sectionTxt='' sectionDesc='End of shift duty Record.' sectionHyphen={false} />
<View style={FormStyles.PrRow}>
<Text style={FormStyles.PrRowTitle}>{this.props.auth.checkedInVenueName}</Text>
<Text style={FormStyles.PrRowDate}>{this.getCurrentDate()}</Text>
</View>
<View style={FormStyles.PrRow}>
<Text style={FormStyles.PrRowSubTitle}>General Manager / Licence Holder:</Text>
<View style={FormStyles.PrTable}>
<View style={FormStyles.prRowStrip}><Text style={FormStyles.prRowStripText} >{this.state.licenceHolder}</Text></View>
</View>
</View>
<View style={FormStyles.PrRow}>
<Text style={FormStyles.PrRowSubTitle}>Door Staff (<Text style={FormStyles.PrRowCount}>{this.state.doorStaffCount}</Text> total)</Text>
<View style={FormStyles.PrTable}>
<FlatList
scrollEnabled={true}
data={this.state.rotaRecords}
keyExtractor={(item, index) => index.toString()}
ListEmptyComponent={this._listStaffEmptyComponent}
renderItem={this._renderDoorStaffItem}
/>
</View>
</View>
<View style={FormStyles.PrRow}>
<Text style={FormStyles.PrRowSubTitle}>Numbers:</Text>
<View style={FormStyles.PrTable}>
<View style={FormStyles.prRowStrip}><Text style={FormStyles.prRowStripText} >Total In <Text style={ FormStyles.prRowStripColon}>:</Text> <Text style={FormStyles.prRowStripOrText}>{this.state.totalIn}</Text></Text></View>
<View style={FormStyles.prRowStrip}><Text style={FormStyles.prRowStripText} >Total Out<Text style={FormStyles.prRowStripColon}>:</Text> <Text style={FormStyles.prRowStripOrText}>{this.state.totalOut}</Text></Text></View>
<View style={FormStyles.prRowStrip}><Text style={FormStyles.prRowStripText} >Overall Difference<Text style={FormStyles.prRowStripColon}>:</Text> <Text style={FormStyles.prRowStripOrText}>{this.state.totalDifference}</Text></Text></View>
</View>
</View>
<View style={FormStyles.PrRow}>
<Text style={FormStyles.PrRowSubTitle}>Door Counts:</Text>
<FlatList
scrollEnabled={true}
data={this.state.countRecords}
keyExtractor={(item, index) => index.toString()}
ListEmptyComponent={this._listDoorCountEmptyComponent}
ListHeaderComponent={this._listDoorCountHeaderComponent}
renderItem={this._renderDoorCountItem}
/>
</View>
<View style={[FormStyles.form, FormStyles.PrRow, {marginTop:15, paddingTop:0, borderBottomWidth:0} ]}>
<Text style={ModalStyles.formTop}><Text style={[ModalStyles.required, ]}>*</Text>Required Field</Text>
<Text style={[FormStyles.formLabel, FormStyles.formlabelFirst ]}>1. Customer Comments:</Text>
<View style={FormStyles.textInputBlock}>
<TextInput
placeholder="Enter Comments"
numberOfLines={4}
onChangeText={val => this.setState({ comments: val})}
value={this.state.comments}
multiline
style={{minHeight: 280, height: 'auto', textAlignVertical: 'top'}}
/>
</View>
<Text style={[FormStyles.formLabel, FormStyles.formlabelFirst ]}>2. Duty Manager Name<Text style={ModalStyles.required}>*</Text> :</Text>
<View style={FormStyles.textInputBlock}>
<TextInput
ref='signatureName'
placeholder="Please Print Name"
style={FormStyles.textInputText}
autoCorrect={false}
returnKeyType='done'
value={this.state.signatureName}
onChangeText={(text) => this.setState({signatureName:text})}
/>
</View>
<Text style={[FormStyles.formLabel, FormStyles.formlabelFirst ]}>3. Duty Manager Signature: <Text style={ModalStyles.required}>*</Text></Text>
<Text style={[FormStyles.formLabelSub, FormStyles.formLabelSubHigh, FormStyles.superHighLight ]}>Note: PRESS BLUE SAVE BUTTON after applying Signature</Text>
<View style={[FormStyles.textInputBlock, this.isSignatureAdded() && FormStyles.signatureBlock ]}>
{this.signatureBlock()}
</View>
</View>
{submitButton}
</KeyboardAvoidingView>
</ScrollView>
</View>
</View>

Answer 1

This is the most common error when working with scroll view and flat list.
To prevent the error cause, we have to manage our views inside a single flat list and put other components in the list header component and list footer component in an efficient way as we desire.
<FlatList
data={this.state.countRecords}
renderItem={(item) => {
return (
// Your flat list item goes here..
)
}}
ListHeaderComponent={
// Content above the list goes here..
}
ListFooterComponent={
// Content below the list should goes here..
}
/>
You can still check the below link for more understanding.
FlatList Example with Custom Header and Custom Footer