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Improve the BackAndroid example to be more clear 

Summary:
The example of `BackAndroid` caused a bit of confusion for beginners (see #8822), so I thought we should clarify the functionality a bit. I added a comment indicating that a user would have to implement `this.onMainScreen` and `this.goBack` on their own, this was the original problem.
Closes https://github.com/facebook/react-native/pull/8829

Differential Revision: D3660332

fbshipit-source-id: d84a29586c6a1a439f386e6b88220d7b0a275129
This commit is contained in:
Daniel Schmidt 2016-08-02 18:16:02 -07:00 committed by Facebook Github Bot 8
parent 1a690d5674
commit c2cf510ff8
1 changed files with 9 additions and 6 deletions
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15
Libraries/Utilities/BackAndroid.android.js
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@ -44,13 +44,16 @@ RCTDeviceEventEmitter.addListener(DEVICE_BACK_EVENT, function() {
* *
* Example: * Example:
* *
* ```js * ```javascript
* BackAndroid.addEventListener('hardwareBackPress', function() { * BackAndroid.addEventListener('hardwareBackPress', function() {
* if (!this.onMainScreen()) { * // this.onMainScreen and this.goBack are just examples, you need to use your own implementation here
* this.goBack(); * // Typically you would use the navigator here to go to the last state.
* return true; *
* } * if (!this.onMainScreen()) {
* return false; * this.goBack();
* return true;
* }
* return false;
* }); * });
* ``` * ```
*/ */