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this tutorial is seond chapter of series build fitness tracker this app use for track workouts, diets, or health activities and analyze data and display suggestion the ultimate goal is to create food and health recommendation using Machine learning we start with creating app that user wants to use and connect to google health and apple heath for gathering everything to create dataset that uses for train model later I start with ultimate goal but we will start with create react native app and set up screen navigation with React navigation. inspired by React native template from instamobile

here the first screen of our app that should display choice for users to decide what screen that user goes to the next login or register screen. We using react native element for more comfortable work on UI

first, install react native element

yarn add react-native-elements

 

then open IntroScreen.js import necessary component

import {
  View,
  StyleSheet,
  ActivityIndicator,
  TouchableOpacity,
} from 'react-native';
import {Text, Icon, Image, Button} from 'react-native-elements';

first, we create the main global wrapper and header section

<View style={styles.container}>
   <View style={styles.headerContainer}>
     <Icon name="md-fitness" size={80} type="ionicon" />
     <Text h4>Welcome to Fitness Master</Text>
     <Text h5 style={{textAlign: 'center'}}>
       The best App for track Fitness workout and Meal planner
     </Text>
   </View>
 </View>

then add stylesheet

const styles = StyleSheet.create({
    container: {
      backgroundColor: '#F4F6FA',height:'100%',
      flexDirection: 'column',
      justifyContent: 'center',
    },
    headerContainer: {
      top: 30,
      justifyContent: 'center',
      alignItems: 'center',
      padding: 40
    },
  });

later try close terminal and rebuild app again your will found this because we did not set up Font icon

we need to install react native vector icons

yarrn add react-native-vector-icons

for iOS install Cacoapod

cd ios ; pod install

then open Xcode open info.plist then register font

<key>UIAppFonts</key>
  <array>
    <string>AntDesign.ttf</string>
    <string>Entypo.ttf</string>
    <string>EvilIcons.ttf</string>
    <string>Feather.ttf</string>
    <string>FontAwesome.ttf</string>
    <string>FontAwesome5_Brands.ttf</string>
    <string>FontAwesome5_Regular.ttf</string>
    <string>FontAwesome5_Solid.ttf</string>
    <string>Foundation.ttf</string>
    <string>Ionicons.ttf</string>
    <string>MaterialIcons.ttf</string>
    <string>MaterialCommunityIcons.ttf</string>
    <string>SimpleLineIcons.ttf</string>
    <string>Octicons.ttf</string>
    <string>Zocial.ttf</string>
  </array>

 

then rebuild the project again

you will see icon error because we did not activate font icon in Android project

open android/app/build.gradle add code below

project.ext.vectoricons = [
  iconFontNames: [ 'MaterialIcons.ttf','Ionicons.ttf','FontAwesome.ttf' ]
]
apply from: "../../node_modules/react-native-vector-icons/fonts.gradle"

now run react-native run-android agian

next step we add image feature create a folder for containing an image

than add below the title

<Image
  source={require('../assets/image/onboard.jpg')}
  style={{width: '100%', height: 300}}
  PlaceholderContent={<ActivityIndicator />}
/>

 

your will see simple full-width image

next, we hide header bar

static navigationOptions = {
  headerShown: false,
};

 

and add button also touchable text

<View style={styles.contentView}>
          <Button
            onPress={() => this.props.navigation.navigate('EmailInputScreen')}
            title="Get started"
            loading={false}
            loadingProps={{size: 'small', color: 'white'}}
            buttonStyle={{
              backgroundColor: '#7265E3',
              borderRadius: 5,
            }}
            titleStyle={{fontWeight: 'bold', fontSize: 23}}
            containerStyle={{marginVertical: 10, height: 50, width: 300}}
            underlayColor="transparent"
          />
          <Text h4 style={{textAlign: 'center', color: 'grey'}}>
            Already have an account?
          </Text>
          <TouchableOpacity
            onPress={() => this.props.navigation.navigate('LoginScreen')}>
            <Text h4 style={{textAlign: 'center', color: 'blue'}}>
              Sign in
            </Text>
          </TouchableOpacity>
        </View>

then add some style

const styles = StyleSheet.create({
  container: {
    backgroundColor: '#F4F6FA',
    height: '100%',
    flexDirection: 'column',
    justifyContent: 'center',
  },
  headerContainer: {
    top: 30,
    justifyContent: 'center',
    alignItems: 'center',
    padding: 40,
  },
  heading: {
    color: 'white',
    marginTop: 10,
    fontSize: 22,
    fontWeight: 'bold',
  },
  contentView: {
    marginTop: 40,
    justifyContent: 'center',
    alignItems: 'center',
  },
});

 

that show properly on iOS

but android need fix

we reduce image height and margin

headerContainer: {
    // top: 30,
    justifyContent: 'center',
    alignItems: 'center',
    padding: 40,
  },
  heading: {
    color: 'white',
    marginTop: 10,
    fontSize: 22,
    fontWeight: 'bold',
  },
  contentView: {
    // marginTop: 40,
    justifyContent: 'center',
    alignItems: 'center',
  },

now we got the final result

conclusion

here we just start and finish working on React native layout for simple style but require an amount of work but in the final, we got a beautiful screen that makes us feel better


Also published on Medium.

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