React-Native应用程序不会在“后退"按钮上关闭 [英] React-native application does not shut down on back button

问题描述

当按下后退"按钮时，我的本机应用程序(在Android上)没有关闭.它关闭并在后台运行，然后在其中运行(动画).

My react-native application (on Android) does not shut down when back button is pressed. It closes and goes in the background and runs there (animates).

我也尝试过此方法，但是得到了相同的结果:

I also tried this, but got the same outcome:

BackHandler.addEventListener('hardwareBackPress', () => {

  console.log('back pressed');
  BackHandler.exitApp();
});

我希望它在按返回或主页按钮时完全关闭.

P.S.我正在使用Expo进行开发和部署，并通过它启动应用程序.

P.S. I'm using Expo for development and deployment, and also start the app through it.

推荐答案

 constructor(props) {
                   super(props);
                   this.handleBackButtonClick = this.handleBackButtonClick.bind(this);
                 }

                 componentWillMount() {
                   BackHandler.addEventListener('hardwareBackPress', this.handleBackButtonClick);
                 }

                 componentWillUnmount() {
                   BackHandler.removeEventListener('hardwareBackPress', this.handleBackButtonClick);
                 }

                 handleBackButtonClick() {
                   BackHandler.exitApp();
                 }

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