[英]React-Native BackHandler always closes App in Android (hardware back)
[英]How to use Backhandler in React-native
当我什至触摸 Android 后退按钮两次时,我无法退出应用程序。 只是卡在第一个底部标签中。
屏幕上有四个按钮到 go 到每个视图。(在同一 class 组件中)
当你调用 BackHandler.exitApp(); 应用程序将关闭,但仍将保留在 android 的最近选项卡中。
BackHandler.exitApp();
在这里,我将分享一个 react-native BackHandler api 的例子。 当您想通过单击返回按钮退出应用程序时,您应该使用hardwareBackPress EventListener,让我们通过一个示例来说明。
import React, { Component } from "react";
import { Text, View, StyleSheet, BackHandler, Alert } from "react-native";
class App extends Component {
backAction = () => {
Alert.alert("Hold on!", "Are you sure you want to go back?", [
{
text: "Cancel",
onPress: () => null,
style: "cancel"
},
{ text: "YES", onPress: () => BackHandler.exitApp() }
]);
return true;
};
componentDidMount() {
this.backHandler = BackHandler.addEventListener(
"hardwareBackPress",
this.backAction
);
}
componentWillUnmount() {
this.backHandler.remove();
}
render() {
return (
<View style={styles.container}>
<Text onPress = {this.backAction} style={styles.text}>Click Back button!</Text>
</View>
);
}
};
const styles = StyleSheet.create({
container: {
flex: 1,
alignItems: "center",
justifyContent: "center"
},
text: {
fontSize: 18,
fontWeight: "bold"
}
});
export default App;
import {BackHandler,Alert} from 'react-native';
const backAction = () => {
Alert.alert('AppName', 'Are you sure you want to exit?', [
{
text: 'NO',
onPress: () => null,
style: 'cancel',
},
{text: 'YES', onPress: () => BackHandler.exitApp()},
]);
return true;
};
useEffect(() => {
BackHandler.addEventListener('hardwareBackPress', backAction);
return () => {
BackHandler.removeEventListener('hardwareBackPress', backAction);
};
}, []);
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