Image Gallery also known as Photo Album is used to show multiple images on user’s screen with Tap to open feature. Image Gallery is a layout on your application where you can see all the application images at a single place and you can open them by tapping. We are using the FlatList in this tutorial to creating image gallery and to show images in Grid format we are using numColumns = {2} prop of FlatList. To show image individually we would use Modal component, this component allow us to create a popup on screen with Fade in and Fade out animation effect. So in this tutorial we would going to Creating Image Gallery using JSON parsing data in iOS Android react native application example tutorial.
Contents in this project Creating Image Gallery using JSON iOS Android Tutorial in React Native App:
1. JSON used in this tutorial is already created inside my previous tutorial Custom JSON ListView with Images and Text. I have explained all the MySQL database and PHP files to creating JSON in my previous tutorial.
2. Screenshot of JSON.
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import React, { Component } from 'react'; import { Platform, StyleSheet, View, FlatList, ActivityIndicator, Image, Modal, TouchableOpacity } from 'react-native'; |
4. Creating constructor() in your project, Now we would make 3 State named as isLoading, ModalVisibleStatus and TempImageURL .
isLoading : Used to Show and Hide the activity indicator after successfully JSON parsed.
ModalVisibleStatus : Used to show and hide the Modal component.
TempImageURL : Used to hold the single image URL as Source while we show individually image in Modal.
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constructor() { super(); this.state = { isLoading: true, ModalVisibleStatus: false, TempImageURL : '' } } |
5. Creating componentDidMount() inbuilt method to Parse JSON data and store JSON into dataSource.
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componentDidMount() { return fetch('https://reactnativecode.000webhostapp.com/FlowersList.php') .then((response) => response.json()) .then((responseJson) => { this.setState({ isLoading: false, dataSource: responseJson }, function() { // In this block you can do something with new state. }); }) .catch((error) => { console.error(error); }); } |
6. Creating a function named as ShowModalFunction() with 2 parameters visible and imageURL. visible is used to hold the Modal visibility status which is in True or False and imageURL is used to hold the Image HTTP Path when user click on any image. We would also store both values State.
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ShowModalFunction(visible, imageURL) { this.setState({ ModalVisibleStatus: visible, TempImageURL : imageURL}); } |
7. Put a IF condition in render’s block using State value to show or hide the Activity Indicator on data load.
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render() { if (this.state.isLoading) { return ( <View style={{flex: 1, justifyContent: 'center', alignItems: 'center'}}> <ActivityIndicator size="large" /> </View> ); } return ( ); } |
8. Creating a Root View in render’s return block, This view is our main view.
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render() { if (this.state.isLoading) { return ( <View style={{flex: 1, justifyContent: 'center', alignItems: 'center'}}> <ActivityIndicator size="large" /> </View> ); } return ( <View style={styles.MainContainer}> </View> ); } |
9. Creating FlatList component in Root View to show all the images in Grid Format.
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render() { if (this.state.isLoading) { return ( <View style={{flex: 1, justifyContent: 'center', alignItems: 'center'}}> <ActivityIndicator size="large" /> </View> ); } return ( <View style={styles.MainContainer}> <FlatList data={ this.state.dataSource } renderItem={({item}) => <View style={{flex:1, flexDirection: 'column', margin:1 }}> <TouchableOpacity onPress={this.ShowModalFunction.bind(this, true, item.flower_image_url)} > <Image style={styles.imageThumbnail} source = {{ uri: item.flower_image_url }} /> </TouchableOpacity> </View> } numColumns = { 2 } keyExtractor={(item, index) => index} /> </View> ); } |
10. Now finally we need to put a Curly brackets block after FlatList and inside this block we would use the Ternary operator with State to show and hide the Modal component. Modal is used to show single image at a time.
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render() { if (this.state.isLoading) { return ( <View style={{flex: 1, justifyContent: 'center', alignItems: 'center'}}> <ActivityIndicator size="large" /> </View> ); } return ( <View style={styles.MainContainer}> <FlatList data={ this.state.dataSource } renderItem={({item}) => <View style={{flex:1, flexDirection: 'column', margin:1 }}> <TouchableOpacity onPress={this.ShowModalFunction.bind(this, true, item.flower_image_url)} > <Image style={styles.imageThumbnail} source = {{ uri: item.flower_image_url }} /> </TouchableOpacity> </View> } numColumns = { 2 } keyExtractor={(item, index) => index} /> { this.state.ModalVisibleStatus ? ( <Modal transparent={false} animationType={"fade"} visible={this.state.ModalVisibleStatus} onRequestClose={ () => { this.ShowModalFunction(!this.state.ModalVisibleStatus)} } > <View style={styles.modalView}> <Image style={styles.mainImage} source = {{ uri: this.state.TempImageURL }} /> <TouchableOpacity activeOpacity = { 0.5 } style={styles.TouchableOpacity_Style} onPress={() => { this.ShowModalFunction(!this.state.ModalVisibleStatus)} } > <Image source={{uri: 'https://reactnativecode.com/wp-content/uploads/2018/01/close_button.png'}} style={{width:25, height: 25}} /> </TouchableOpacity> </View> </Modal> ) : null } </View> ); } |
10. Creating Style.
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const styles = StyleSheet.create({ MainContainer :{ justifyContent: 'center', flex:1, paddingTop: (Platform.OS) === 'ios' ? 20 : 0 }, imageThumbnail: { justifyContent: 'center', alignItems: 'center', height: 100 }, mainImage:{ justifyContent: 'center', alignItems: 'center', height: '100%', width:'98%', resizeMode : 'contain' }, modalView:{ flex:1, justifyContent: 'center', alignItems: 'center', backgroundColor: 'rgba(0,0,0,0.4)' }, TouchableOpacity_Style:{ width:25, height: 25, top:9, right:9, position: 'absolute' } }); |
11. Complete source code for App.js File :
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import React, { Component } from 'react'; import { Platform, StyleSheet, View, FlatList, ActivityIndicator, Image, Modal, TouchableOpacity } from 'react-native'; export default class App extends Component{ constructor() { super(); this.state = { isLoading: true, ModalVisibleStatus: false, TempImageURL : '' } } componentDidMount() { return fetch('https://reactnativecode.000webhostapp.com/FlowersList.php') .then((response) => response.json()) .then((responseJson) => { this.setState({ isLoading: false, dataSource: responseJson }, function() { // In this block you can do something with new state. }); }) .catch((error) => { console.error(error); }); } ShowModalFunction(visible, imageURL) { this.setState({ ModalVisibleStatus: visible, TempImageURL : imageURL}); } render() { if (this.state.isLoading) { return ( <View style={{flex: 1, justifyContent: 'center', alignItems: 'center'}}> <ActivityIndicator size="large" /> </View> ); } return ( <View style={styles.MainContainer}> <FlatList data={ this.state.dataSource } renderItem={({item}) => <View style={{flex:1, flexDirection: 'column', margin:1 }}> <TouchableOpacity onPress={this.ShowModalFunction.bind(this, true, item.flower_image_url)} > <Image style={styles.imageThumbnail} source = {{ uri: item.flower_image_url }} /> </TouchableOpacity> </View> } numColumns = { 2 } keyExtractor={(item, index) => index} /> { this.state.ModalVisibleStatus ? ( <Modal transparent={false} animationType={"fade"} visible={this.state.ModalVisibleStatus} onRequestClose={ () => { this.ShowModalFunction(!this.state.ModalVisibleStatus)} } > <View style={styles.modalView}> <Image style={styles.mainImage} source = {{ uri: this.state.TempImageURL }} /> <TouchableOpacity activeOpacity = { 0.5 } style={styles.TouchableOpacity_Style} onPress={() => { this.ShowModalFunction(!this.state.ModalVisibleStatus)} } > <Image source={{uri: 'https://reactnativecode.com/wp-content/uploads/2018/01/close_button.png'}} style={{width:25, height: 25}} /> </TouchableOpacity> </View> </Modal> ) : null } </View> ); } } const styles = StyleSheet.create({ MainContainer :{ justifyContent: 'center', flex:1, paddingTop: (Platform.OS) === 'ios' ? 20 : 0 }, imageThumbnail: { justifyContent: 'center', alignItems: 'center', height: 100 }, mainImage:{ justifyContent: 'center', alignItems: 'center', height: '100%', width:'98%', resizeMode : 'contain' }, modalView:{ flex:1, justifyContent: 'center', alignItems: 'center', backgroundColor: 'rgba(0,0,0,0.4)' }, TouchableOpacity_Style:{ width:25, height: 25, top:9, right:9, position: 'absolute' } }); |
Screenshots in Android device:
Screenshots in iOS device:
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Thanks for the good article.
Welcome bro 🙂 .
Bro i need a react native tutorials from basic level explaining all the concepts
Prasad basic level meaning Installation guide or how components work ? Please tell me .
Hey, does this still work? For some reason when I .bind(this, true, item.source) the Modal just refuses to open. If i remove the bind ( this.setModalVisible(true, item.source) ) the Modal opens, but of course it doesn’t display the image.
Yes Victor it is working .
Thankyou bro your tutorials are owesome.
Will you please create tutorial on push notification using expo and php myadmin mysql
Thanks for comment Nitin, I will sure post tutorial on push notification using expo soon 🙂 .
please send me your database and php file
Abbas you can find the database config file here on my this tutorial https://reactnativecode.com/custom-json-listview-images-text-api-android-ios/ . The database file name is DBConfig.php and FlowersList.php .
Hello, when I click on the image in the code, the image opens, how do I put the button under the image and I want to download the pdf file? When I click on the flower image I want to tell the pdf button to download and download?
Mustafa inside the Modal view just put the your button and to download the PDF you can use react-native-fetch-blob library.
Is it still working?
I got error in this..
SyntaxError: JSON Parse error: Unrecognized token ‘<'