第一步監(jiān)聽

???AppState.addEventListener('change',?this._handleAppStateChange);

第二部：

handleAppStateChange?=?(currentAppState)?=>?{

????????if(this.lastAppState?===?'background'?&&?currentAppState?===?'active')?{

????????????//refresh

????????????let?baseId?=?this.props.navigation.state.params.id;

????????????let?eid?=?this.props.navigation.state.params.eid;

????????????this.getSignaturePageWord2ImagesResp(baseId,?eid);

????????}

????????this.lastAppState?=?currentAppState;

??????}

第三部：

?componentWillUnmount?=?()=>{

????//?Remove?the?listener?when?you?are?done

????AppState.removeEventListener('change',?this._handleAppStateChange);

????}