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App.js
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App.js
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import * as React from 'react';
import {useState,Component} from 'react';
import { View, Text,Button,TextInput,StyleSheet,Alert } from 'react-native';
import { NavigationContainer } from '@react-navigation/native';
import { createStackNavigator } from '@react-navigation/stack';
import { TouchableHighlight } from 'react-native-gesture-handler';
import GetLocation from 'react-native-get-location';
function DetailsScreen({route,navigation}) {
/* 2. Get the param */
const { itemId } = route.params;
return (
<View style={{ flex: 1, alignItems: 'center', justifyContent: 'center' }}>
<Text style={{fontSize:15,margin:10,fontWeight:'bold'}}>Welcome {(itemId)}! This is your Running Helper</Text>
<Button
title="Locate Me"
onPress={()=>{
navigation.navigate('located')
}}
></Button>
</View>
);
}
class getLocation extends Component {
state={
latitude:null,
longitude:null,
endLatitude:null,
endLongitude:null,
distanceTravelled:0
}
startTrackingHandle = () => {
GetLocation.getCurrentPosition({
enableHighAccuracy: true,
timeout: 15000,
maximumAge:1000
})
.then(location => {
// Alert.alert(location.latitude+' '+location.longitude);
this.setState({
latitude:location.latitude,
longitude:location.longitude
})
})
.catch(error => {
const { code, message } = error;
console.warn(code, message);
})
}
endTrackingHandle = () => {
GetLocation.getCurrentPosition({
enableHighAccuracy: true,
timeout: 15000,
maximumAge:1000
})
.then(location => {
// Alert.alert(location.latitude+' '+location.longitude);
this.setState({
endLatitude:location.latitude,
endLongitude:location.longitude
})
})
.catch(error => {
const { code, message } = error;
console.warn(code, message);
})
}
calculateDistance = () => {
var lat1 = this.state.latitude;
var lon1 = this.state.longitude;
var lat2 = this.state.endLatitude;
var lon2 = this.state.endLongitude;
//calculating distance using lat and long.....(Haversine Formullae)
var R = 6371; // Radius of the earth in km
var dLat = (lat2-lat1)* (Math.PI/180); // deg2rad below
var dLon = (lon2-lon1)* (Math.PI/180);
var a =
Math.sin(dLat/2) * Math.sin(dLat/2) +
Math.cos((lat1)* (Math.PI/180)) * Math.cos((lat2)* (Math.PI/180)) *
Math.sin(dLon/2) * Math.sin(dLon/2)
;
var c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a));
var d = R * c; // Distance in km
//trimming till 3 decimal values
d = d.toFixed(3);
this.setState({
distanceTravelled:d
})
}
render() {
return(
<View style={{ flex: 1, alignItems: 'center', justifyContent: 'center' }}>
<Button
title='Start Tracking!'
onPress={() => {
this.startTrackingHandle();
}}
/>
<Text style={{margin:10}}>Initial Latitude:- {this.state.latitude}</Text>
<Text style={{margin:10}}>Initial Longitude:- {this.state.longitude}</Text>
<Button
title='End Tracking!'
onPress={() => {
this.endTrackingHandle();
}}
/>
<Text style={{margin:10}}>Final Latitude:- {this.state.endLatitude}</Text>
<Text style={{margin:10}}>Final Longitude:- {this.state.endLongitude}</Text>
<Button
title='Calculate Distance!'
onPress={()=>{
this.calculateDistance();
}}
/>
<Text style={{margin:10,fontWeight:'bold'}}>You Ran for {this.state.distanceTravelled} Kms!</Text>
</View>
)};
}
function HomeScreen({navigation}) {
const [text, setText] = useState('');
return (
<View style={{ flex: 1, alignItems: 'center', justifyContent: 'center',backgroundColor:'white' }}>
<Text>Home Screen</Text>
<TextInput
style={{height: 40,width:200, borderColor: 'green', borderWidth: 1,margin:10}}
placeholder="Enter your name!"
onChangeText={text => setText(text)}
defaultValue={text}
secureTextEntry={false}
/>
<Button
title="Go to Details"
onPress={() => {
navigation.navigate('Details',{
itemId:text,
})
}}
/>
</View>
);
}
const Stack = createStackNavigator();
function App() {
return (
<NavigationContainer>
<Stack.Navigator initialRouteName="Home">
<Stack.Screen name="Home" component={HomeScreen} options={{
title: 'FITNESS APP',
headerStyle:{
backgroundColor:'#f4511e',
},
headerTintColor:'#fff',
headerTitleStyle:{
fontWeight:'bold'
}
}} />
<Stack.Screen name="Details" component={DetailsScreen} />
<Stack.Screen name="located" component={getLocation} />
</Stack.Navigator>
</NavigationContainer>
);
}
export default App;