React Native Async Storage - Cant render value on screen - react-native

Hey struggling with this one for a day now.
I am trying to store game data just the gameId and the Level for example Game 1 Level 12
Here is my screen
import React, { Component } from 'react';
import AsyncStorage from '#react-native-async-storage/async-storage';
import { Text, StyleSheet, Button, View, ImageBackground, Pressable } from 'react- native';
import bg from "../assets/images/1.jpg";
import styles from '../assets/style';
import { NavigationContainer } from '#react-navigation/native';
import { createStackNavigator } from '#react-navigation/stack';
const setScore = async (gameId, level) => {
//// SETS THE SCORE
try {
await AsyncStorage.setItem(scoreKey, level);
console.log(value)
} catch (error) {
console.log(error)
}
};
const getScore = async (gameId) => {
try {
let value = await AsyncStorage.getItem(JSON.stringify(gameId))
if(value !== null) {
// value previously stored
return JSON.stringify(value)
} else {
return "not started"
}
} catch(e) {
// error reading value
}
};
/// This would add game 1 and level 12
setScore('1','12') /// This part works
const theLevel = getScore(1)
export default function Home({navigation, route}) {
return (
<ImageBackground source={bg} resizeMode="cover" style={styles.imageBG}>
<View style={styles.GameList}>
<Text style={styles.mainTitle}>Current Level is {theLevel}</Text>
</View>
</ImageBackground>
);
}
At the bottom of the above code I want to display the level but I get the error
Error: Objects are not valid as a React child (found: object with keys {_U, _V, _W, _X}). If you meant to render a collection of children, use an array instead.
However If I alert(theLevel) it works fine can someone tell me what I am doing wrong please

Call getScore function from within useEffect hook of your Home component.
export default function Home({ navigation, route }) {
const [level, setLevel] = useState(0);
useEffect(() => {
async function getMyLevel() {
const lvl = await getScore(1);
setLevel(lvl);
}
getMyLevel();
}, []);
const onPress = async () => {
await setScore('1','12');
};
return (
<ImageBackground source={bg} resizeMode="cover" style={styles.imageBG}>
<View style={styles.GameList}>
<Text style={styles.mainTitle}>Current Level is {level}</Text>
</View>
<Button title="Set Score" onPress={onPress} />
</ImageBackground>
);
}

Related

React Native App - swipe right means all componenets unmount....can this be stopped?

With Android...when you swipe right on an app, it will unmount all components and cease all app operations. First component to be unmounted appears to be the parent componenet (normally named app.js).....please correct me if Im wrong on this.
When this happens..I know the componentWillUnmount event fires as I added the code below that logs to the console.
componentWillUnmount() {
console.log('app.js....componentWillUnmount');
}
My question is whether I can add some extra code within componentWillUnmount that could Alert the user "are you sure you want to quit app?"....and give them an option so say "no" and keep the app live
The BackHandler API description on the React-Native official docs has the example for the same use case. You can take a look at the given example code snippet on the official docs and pick the example with functional or class based component as per your choice.
You can place that code at the top level component like App.js or Routes.js.
Another approach with the autohide toast can be:
Using functional component
import React, {useEffect, useRef} from 'react';
import {Text, SafeAreaView, BackHandler, ToastAndroid} from 'react-native';
export default function App() {
const doubleBackToExitPressedOnce = useRef(false);
useEffect(() => {
const backAction = () => {
if (doubleBackToExitPressedOnce.current) {
BackHandler.exitApp();
return true;
}
ToastAndroid.show('Press back again to exit', ToastAndroid.SHORT);
doubleBackToExitPressedOnce.current = true;
setTimeout(() => {
doubleBackToExitPressedOnce.current = false;
}, 2000);
return true;
};
const backHandler = BackHandler.addEventListener(
'hardwareBackPress',
backAction,
);
return () => backHandler.remove();
}, []);
return (
<SafeAreaView>
<Text>Hello world!</Text>
</SafeAreaView>
);
}
Using class component:
import React, {Component} from 'react';
import {SafeAreaView, Text, BackHandler, ToastAndroid} from 'react-native';
export default class App extends Component {
backAction = () => {
if (this.doubleBackToExitPressedOnce) {
BackHandler.exitApp();
}
ToastAndroid.show('Press back again to exit', ToastAndroid.SHORT);
this.doubleBackToExitPressedOnce = true;
setTimeout(() => {
this.doubleBackToExitPressedOnce = false;
}, 2000);
return true;
};
componentDidMount() {
this.doubleBackToExitPressedOnce = false;
this.backHandler = BackHandler.addEventListener(
'hardwareBackPress',
this.backAction,
);
}
componentWillUnmount() {
this.backHandler.remove();
}
render() {
return (
<SafeAreaView>
<Text>Hello world!</Text>
</SafeAreaView>
);
}
}

Screen State not Updating from AsyncStorage when going back

I'm building a React Native app.
My app has 5 Screens: Home (initialRouteName), DeckPage, QuestionPage, NewCardPage, NewDeckPage. (in this order)
I'm using Redux for state management. The state is updating from AsyncStorage.
The component that does the fetching is the class component "Home" by dispatching the "fetching" function in componentDidMount.
Component NewCardPage, NewDeckPAge are also updating the state with new content by dispatching the same fetching function as the Home when a button is pressed.
My problem appears when I want to delete a Deck component from inside DeckPage parent component. The function that does this job has this functionality: after removing the item from AsyncStorage, updates the STATE, and moves back to Screen HOME. The issue is that when I go back to HOME component the state doesn't update with the latest info from AsyncStorage.
This is not the case when I'm doing the same operation in the other 2 components NewCardPage, NewDeckPage.
I'll paste the code below:
import React, { Component } from "react";
import { connect } from "react-redux";
import { View, Text, StyleSheet, FlatList } from "react-native";
import Header from "../components/Header";
import AddDeckButton from "../components/AddDeckButton";
import DeckInList from "../components/DeckInList";
import { receiveItemsAction } from "../redux/actions";
class Home extends Component {
componentDidMount() {
this.props.getAsyncStorageContent();
}
renderItem = ({ item }) => {
return <DeckInList {...item} />;
};
render() {
const { items } = this.props;
// console.log(items);
const deckNumber = Object.keys(items).length;
return (
<View style={styles.container}>
<Header />
<View style={styles.decksInfoContainer}>
<View style={styles.deckNumber}>
<View style={{ marginRight: 50 }}>
<Text style={styles.deckNumberText}>{deckNumber} Decks</Text>
</View>
<AddDeckButton />
</View>
<View style={{ flex: 0.9 }}>
<FlatList
data={Object.values(items)}
renderItem={this.renderItem}
keyExtractor={(item) => item.title}
/>
</View>
</View>
</View>
);
}
}
const mapStateToProps = (state) => {
return {
items: state.items,
};
};
const mapDispatchToProps = (dispatch) => {
return {
getAsyncStorageContent: () => dispatch(receiveItemsAction()),
};
};
-----------DECKPAGE COMPONENT------------
import React from "react";
import { View, StyleSheet } from "react-native";
import Deck from "../components/Deck";
import { useSelector, useDispatch } from "react-redux";
import { removeItemAction, receiveItemsAction } from "../redux/actions";
import AsyncStorage from "#react-native-community/async-storage";
const DeckPage = ({ route, navigation }) => {
const { title, date } = route.params;
const questions = useSelector((state) => state.items[title].questions);
const state = useSelector((state) => state.items);
const dispatch = useDispatch();
// const navigation = useNavigation();
const handleRemoveIcon = async () => {
await AsyncStorage.removeItem(title, () => {
dispatch(receiveItemsAction());
navigation.goBack();
});
};
console.log(state);
return (
<View style={styles.deckPageContainer}>
<Deck
handleRemoveIcon={handleRemoveIcon}
title={title}
questions={questions}
date={date}
/>
</View>
);
};
-----------This is my ACTIONS file----------
import AsyncStorage from "#react-native-community/async-storage";
export const RECEIVE_ITEMS = "RECEIVE_ITEMS";
// export const REMOVE_ITEM = "REMOVE_ITEM";
export const receiveItemsAction = () => async (dispatch) => {
const objectValues = {};
try {
const keys = await AsyncStorage.getAllKeys();
if (keys.length !== 0) {
const jsonValue = await AsyncStorage.multiGet(keys);
if (jsonValue != null) {
for (let element of jsonValue) {
objectValues[element[0]] = JSON.parse(element[1]);
}
dispatch({
type: RECEIVE_ITEMS,
payload: objectValues,
});
} else {
return null;
}
}
} catch (e) {
console.log(e);
}
};
-----This is my REDUCERS file----
import { RECEIVE_ITEMS, REMOVE_ITEM } from "./actions";
const initialState = {
};
const items = (state = initialState, action) => {
switch (action.type) {
case RECEIVE_ITEMS:
return {
...state,
...action.payload,
};
// case REMOVE_ITEM:
// return {
// ...state,
// ...action.payload,
// };
default:
return state;
}
}
export default items;
-----This is my UTILS file----
import AsyncStorage from "#react-native-community/async-storage";
export const removeDeckFromAsyncStorage = async (title)=>{
try{
await AsyncStorage.removeItem(title);
}
catch(e){
console.log(`Error trying to remove deck from AsyncStorage ${e}`);
}
}

Unable to load provider from react-redux module in react native

I am creating a slide bar, In that, I have used the react-redux library. When I call the class which contains the redux-code, it works fine. I want to show this slide bar after login. Therefore, with conditions (I set a state variable if user login successfully then only this page should get rendered), I tried to call the same file which shows a blank page. I printed the console log. I am able to print all the logs. But with conditions, I am not able to load the data.
I don't know much about react-redux.Can you assist me to resolve this?
My code is,
main.js,
import React, {Component} from 'react';
import {
StyleSheet,
Dimensions,
Platform,
View,
StatusBar,
DrawerLayoutAndroid,
} from 'react-native';
import { createStore } from 'redux';
import { Provider } from 'react-redux';
import reducer from '../Redux/reducers';
import { setNavigator, setActiveRoute } from "../Redux/actions";
import DrawerContent from '../Navigation/DrawerContent';
import Toolbar from '../Navigation/Toolbar';
import AppNavigation from '../Navigation/AppNavigation';
import { bgStatusBar, bgDrawer } from '../global.styles';
let store = createStore(reducer);
/* getDrawerWidth Default drawer width is screen width - header width
* https://material.io/guidelines/patterns/navigation-drawer.html
*/
const getDrawerWidth = () => Dimensions.get('window').width - (Platform.OS === 'android' ? 56 : 64);
export default class Main extends Component {
constructor() {
super();
this.drawer = React.createRef();
this.navigator = React.createRef();
}
componentDidMount() {
store.dispatch(setNavigator(this.navigator.current));
}
openDrawer = () => {
this.drawer.current.openDrawer();
};
closeDrawer = () => {
this.drawer.current.closeDrawer();
};
getActiveRouteName = navigationState => {
if (!navigationState) {
return null;
}
const route = navigationState.routes[navigationState.index];
// dive into nested navigators
if (route.routes) {
return getActiveRouteName(route);
}
return route.routeName;
};
render() {
return (
<Provider store={store}>
<DrawerLayoutAndroid
drawerWidth={getDrawerWidth()}
drawerPosition={DrawerLayoutAndroid.positions.Left}
renderNavigationView={
() => <DrawerContent closeDrawer={this.closeDrawer} />
}
ref={this.drawer}
>
<View style={styles.container}>
<StatusBar
translucent
animated
/>
<Toolbar showMenu={this.openDrawer} />
<AppNavigation
onNavigationStateChange={(prevState, currentState) => {
const currentScreen = this.getActiveRouteName(currentState);
store.dispatch(setActiveRoute(currentScreen));
}}
ref={this.navigator}
/>
</View>
</DrawerLayoutAndroid>
</Provider>
);
}
}
Login.js
import Main from './main';
render() {
return (
<View>
{this.state.isLoggedIn ?
<Main/>
:
<ChangePassword isUpdatePassword={this.state.isUpdatePassword} callLogin={this.callLogin}/>
);
}
}
If I just call Main class inside render method it works. But It does not work with conditions.

react-native redux props changes back to undefined

I'm trying to add a filter to my app, but for some reason selectedValue in the <Picker> component doesn't stick with the option I select. I can see the filter text changing from "all" to "lobby" in the top left, however as soon as the player list fully renders, it changes back to "all." and playerListFilterType prop is set to undefined. I stepped through the code in a debugger, and it stays "lobby" until the list re-renders. The action itself works, so the list is showing accurate results.
Here's what my code looks like:
import React from 'react'
import { View, Picker } from 'react-native'
import PlayerList from '../components/PlayerList'
import { fetchPlayerListAsync, filterPlayers } from '../redux/actions/player_actions';
import NavigationHeaderTitle from '../components/NavigationHeaderTitle'
import PlayerStatusFilterPicker from '../components/pickers/PlayerStatusFilterPicker'
import { connect } from 'react-redux'
class PlayerListScreen extends React.Component {
static navigationOptions = ({ navigation }) => {
const playerStatusFilterPicker = (
<PlayerStatusFilterPicker
playerListFilterType={navigation.getParam('playerListFilterType')}
filterPlayers={navigation.getParam('filterPlayers')}
playerList={navigation.getParam('playerList')}
/>
)
return {
headerTitle: navigation.getParam('headerButton'),
headerRight: playerStatusFilterPicker
}
}
async componentDidMount() {
await this.fetchPlayersAsync();
}
setNavigationParams = () => {
this.props.navigation.setParams({
headerButton: this.headerButton,
playerList: this.props.playerList,
playerListFilterType: this.props.playerListFilterType,
filterPlayers: this.props.filterPlayers
})
}
// navigation header element
headerButton = () => (
<NavigationHeaderTitle
handleDataRequest={this.fetchPlayersAsync}
titleMessage={(this.props.fetchingData) ? 'fetching list of players' : `${this.props.playerList.length} online`}
/>
)
fetchPlayersAsync = async () => {
await this.props.fetchPlayerListAsync();
this.setNavigationParams()
}
render() {
return (
<View>
<PlayerList
playerList={this.props.playerList}
fetchingData={this.props.fetchingData}
handleDataRequest={this.fetchPlayersAsync}
/>
</View>
)
}
}
const mapStateToProps = state => {
return {
fetchingData: state.player.fetchingData,
playerList: state.player.playerList,
unfilteredPlayerList: state.player.unfilteredPlayerList,
playerListFilterType: state.player.playerListFilterType
}
};
export default connect(mapStateToProps, { fetchPlayerListAsync, filterPlayers })(PlayerListScreen)
and here's what the filter component looks like, but I don't think the problem lies here:
import React, { Component } from "react";
import {
View,
Picker
} from "react-native";
import * as constants from '../../constants'
class PlayerStatusFilterPicker extends Component {
render() {
return (
<View>
<Picker
selectedValue={this.props.playerListFilterType}
onValueChange={(itemValue) => this.props.filterPlayers(itemValue, this.props.playerList)}
style={{ height: 40, width: 100 }}
>
<Picker.Item label='all' value='all' />
<Picker.Item label="lobby" value={constants.IN_LOBBY} />
<Picker.Item label="in game" value={constants.IN_GAME} />
</Picker>
</View>
);
}
}
export default PlayerStatusFilterPicker;
Here's what the reducer looks like:
// show only the players that are waiting in the main lobby
case actionTypes.SHOW_PLAYERS_IN_LOBBY: {
const filteredList = action.payload.filter(player => player.status === constants.IN_LOBBY)
return { playerList: filteredList, playerListFilterType: constants.IN_LOBBY, fetchingData: false }
}
// show only the players that are currently playing
case actionTypes.SHOW_PLAYERS_IN_GAME: {
const filteredList = action.payload.filter(player => player.status === constants.IN_GAME)
return { playerList: filteredList, playerListFilterType: constants.IN_LOBBY, fetchingData: false }
}
Fixed it by using componentDidUpdate lifecycle method. Like so:
componentDidUpdate(prevProps) {
if (this.props.playerListFilterType != prevProps.playerListFilterType) {
this.props.navigation.setParams({
playerListFilterType: this.props.playerListFilterType
})
}
}

can react-native-root-siblings work with react-redux

in a handleClick function, update the rootSiblings like this,
handleClick() { this.progressBar.update( <ProgressBar /> ); }
and in ProgressBar component,
import React, { PropTypes } from 'react';
import { connect } from 'react-redux';
import { View } from 'react-native';
const getFinishedWidth = progress => ({ width: progress * totalWidth });
const getUnfinishedWidth = progress => ({ width: (1 - progress) * totalWidth });
function CustomerReassignProgressBar(props) {
const { progress } = props;
return (
<View style={styles.bar}>
<View style={getFinishedWidth(progress)} />
<View style={getUnfinishedWidth(progress)} />
</View> );
}
CustomerReassignProgressBar.propTypes = { progress: PropTypes.number, };
const mapStateToProps = state => ({ progress: state.batchReassignProgress, });
export default connect(mapStateToProps)(ProgressBar);
then, when calling handleClick(), the app crushed, the error is, 'Could not find "store" in either the context or props of "Connect(ProgressBar)". Either wrap the root component in a , or explicitly pass "store" as a prop to "Connect(ProgressBar)".'
if I don't use connect in component, it works well. So, I guess, maybe rootSiblings can not work with react-redux. But does anyone knows this problem?
Upgrade to react-native-root-siblings#4.x
Then
import { setSiblingWrapper } from 'react-native-root-siblings';
import { Provider } from 'react-redux';
const store = xxx;// get your redux store here
// call this before using any root-siblings related code
setSiblingWrapper(sibling => (
<Provider store={store}>{sibling}</Provider>
));