BackAndroid已经被废弃。改用BackHandler 关键代码
componentWillMount() {
if (Platform.OS === 'android') {
this.listener = BackHandler.addEventListener('hardwareBackPress', this.onBackAndroid);
}
}
componentWillUnmount() {
if (Platform.OS === 'android') {
this.listener.remove('hardwareBackPress');
}
}
onBackAndroid = () => {
const navigator = this.refs.navigator;//**************************
const routers = navigator.getCurrentRoutes();
console.log('当前路由长度:' + routers.length);
if (routers.length > 2) {
navigator.pop();
return true;//接管默认行为
} else {
//到了主页了
if (this.lastBackPressed && this.lastBackPressed + 2000 >= Date.now()) {
//最近2秒内按过back键,可以退出应用。
return false;
}
this.lastBackPressed = Date.now();
ToastAndroid.show('再按一次退出应用', ToastAndroid.SHORT);
return true;
}
// return false;//默认行为
};
上面用到了this.refs.navigator,贴一下代码
render() {
return (
<NavigationExperimental.Navigator
initialRoute={{name: 'TestComp', component: TestComp}}
//配置场景
ref="navigator"
configureScene={
(route) => {
return NavigationExperimental.Navigator.SceneConfigs.FloatFromRight;
}
}
renderScene={
(route, navigator) => {
let Component = route.component;
return <Component {...route.params} navigator={navigator}/>
}
}/>
);
}