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Summary: **Motivation** In iOS you cannot dismiss alerts by clicking outside of their box, while on Android you can. This can create some inconsistency if you want to have identical behavior on both platforms. This change makes it possible for Android apps to have irremovable/required alert boxes just like in iOS. This adds an additional parameter to the Alert method. The way to use it is by providing an object with the cancelable property. The cancelable property accepts a boolean value. This utilizes the Android DialogFragment method [setCancelable](https://developer.android.com/reference/android/app/DialogFragment.html#setCancelable(boolean)) **Usage example** ```js Alert.alert( 'Alert Title', null, [ {text: 'OK', onPress: () => console.log('OK Pressed!')}, ], { cancelable: false } ); ``` **Test plan (required)** I added an additional alert to the UIExplorer project where it can be tested. I also added a part in the Dialog Module test to make sure setting canc Closes https://github.com/facebook/react-native/pull/8652 Differential Revision: D3690093 fbshipit-source-id: 4cf6cfc56f464b37ce88451acf33413393454721
Building React Native for Android
See the docs on the website.
Running tests
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