backhandler响应提供给Router道具的backhandler函数中的条件
每次按下硬件后退按钮时，应用都会关闭
这是代码段，并链接到我的git repo：
import React from 'react';
import { Scene, Router, Actions, ActionConst, Stack } from 'react-native-router-flux';
import { AsyncStorage, StyleSheet } from 'react-native';
import { connect } from 'react-redux';
import { bindActionCreators } from 'redux';
//Import Components
import Splash from './components/Splash';
import NavDrawer from './components/NavDrawer';
import PageHeader from './components/Header';
import ScrollableTabBar from './components/ScrollableTabBar';
//Import Containers
import Login from './containers/Login';
import { Approval, DOCustomer, MyConfirmation, MyRequest, ViewRequest, RequestDetails } from './containers/Workspace';
import QRScanner from './containers/QRScanner';
import { Help, UserManual, FAQ } from './containers/Help';
import Setting from './containers/Setting';
//Import Store, actionTypes, Actions
import store from './redux/store'
import * as aType from './actions/actionTypes/authTypes';
import * as authAction from './actions/authActions';
import * as workspaceAction from './actions/workspaceActions';
import * as menuAction from './actions/menuActions';
//Maps actions to NavDrawer's props
export const mapDispatchToProps = (dispatch) => ({
actionsWorkspace: bindActionCreators(workspaceAction, dispatch),
actionsAuth: bindActionCreators(authAction, dispatch),
actionsMenu: bindActionCreators(menuAction, dispatch)
});
class Routes extends React.Component {
constructor() {
super();
this.state = {
isReady: false,
isLoggedIn: false,
toggleUpdate: false
}
}
//load name and token from async and put it in redux's state
componentDidMount() {
AsyncStorage.getItem('username').then(name => {
AsyncStorage.getItem('token').then((data) => {
setTimeout(() => {
if (data !== null) {
store.dispatch({ type: aType.LOGGED_IN, token: data, userName: name });
this.setState({ isReady: true, isLoggedIn: true });
}
else {
store.dispatch({ type: aType.LOGGED_OUT });
this.setState({ isReady: true, isLoggedIn: false })
}
}, 3000)
});
});
}
/**
* Callback to be called when Android hardware back button pressed
*/
handleBackButton() {
if (Actions.currentScene === '_#7552')
this.onSignOut()
else if (Actions.currentScene === 'Login')
BackHandler.exitApp();
else {
Actions.pop()
this.props.actionsMenu.updateMenu(Actions.currentScene) //notify redux state about scene change so it could update menus
}
return true;
}
/**
* Success case callback function
* Call workspace's successSignOut() in actions.js to reset workspace reducer's state
* and go back to login screen
*/
onSuccess() {
this.props.actionsWorkspace.successSignOut();
Actions.reset("Auth");
}
onError(error) {
Alert.alert('Oops!', error.message);
}
/**
* When user clicks Logout button from Drawer
* use signOut() from auth's actions.js
*/
onSignOut() {
this.props.actionsAuth.signOut(this.onSuccess.bind(this), this.onError.bind(this))
}
render() {
if (!this.state.isReady)
return <Splash />
return (
<Router backAndroidHandler={this.handleBackButton.bind(this)} >
<Scene key="root" hideNavBar>
<Stack key="Auth" initial={!this.state.isLoggedIn}>
<Scene key="Login" hideNavBar component={Login} title="Login" />
</Stack>
<Stack key="Main" initial={this.state.isLoggedIn}>
<Scene drawer key="NavDrawer" hideNavBar contentComponent={() => <NavDrawer tabID={7540} />} type={ActionConst.REPLACE} panHandlers={null}>
<Scene key="#7546" navBar={() => <PageHeader title='Workspace' />} drawerLockMode={'locked-closed'}>
<Scene tabs={true} tabBarComponent={() => <ScrollableTabBar tabID={7546} />} tabBarPosition='top' lazy={true} animationEnabled={false} swipeEnabled={false}>
<Scene key="#7552" hideNavBar component={MyRequest} title={"My Request"} />
<Scene key="#7556" hideNavBar component={Approval} title={"Approval"} />
<Scene key="#7559" hideNavBar component={DOCustomer} title={"DO Customer"} />
<Scene key="#7560" hideNavBar component={MyConfirmation} title={"My Confirmation"} />
<Scene key="#7562" hideNavBar component={ViewRequest} title={"View Request"} />
</Scene>
<Scene key="RequestDetails" hideNavBar component={RequestDetails} title="Request Details" />
</Scene>
<Scene key="#7564" navBar={() => <PageHeader title='Help' />} title="Help" drawerLockMode={'locked-closed'}>
<Scene tabs={true} hideTabBar animationEnabled={false} swipeEnabled={false} lazy={true}>
<Scene key="Help" hideNavBar component={Help} title={"Help"} />
<Scene key="UserManual" hideNavBar component={UserManual} title={"User Manual"} />
<Scene key="FAQ" hideNavBar component={FAQ} title={"FAQ"} />
</Scene>
</Scene>
<Scene key="#7565" navBar={() => <PageHeader title='Settings' />} title="Settings" drawerLockMode={'locked-closed'}>
<Scene>
<Scene key="Setting" hideNavBar component={Setting} title={"Setting"} />
</Scene>
</Scene>
<Scene key="#7566" navBar={() => <PageHeader title='QR Scanner' />} title="QR" drawerLockMode={'locked-closed'}>
<Scene>
<Scene key="QRScanner" hideNavBar component={QRScanner} title={"QR Scanner"} />
</Scene>
</Scene>
</Scene>
</Stack>
</Scene>
</Router>
)
}
}
export default connect(null, mapDispatchToProps)(Routes);
由于某种原因，当我使用远程调试器运行它时，它可以工作，但是当我将其放入apk以进行测试运行时，它却无法工作。
感谢任何提示！ ：）
答案 0 :(得分：0)
componentWillMount() {
BackHandler.addEventListener('hardwareBackPress', function () {
if (Actions.state.index === 1) {
BackHandler.exitApp()
}
Actions.pop()
return true
});
}
尝试这个。.让我知道它是否有效