Example of Hardware back button detection using BackHandler

Since BackAndroid is deprecated. Use BackHandler instead of BackAndroid.

import { BackHandler } from 'react-native';

{...}
  ComponentWillMount(){
    BackHandler.addEventListener('hardwareBackPress',()=>{   
      if (!this.onMainScreen()) {
        this.goBack();
        return true;
      }
      return false;
    });
  }

Found a mistake? Have a question or improvement idea? Let me know.

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