App crashes when main activity is closed on Android

[jariztia]

Expected Behaviour

When a code is scanned it should return to the app with the right callbackContext. This can be resolved by overriding the onRestoreStateForActivityResult method on the plugin and set the callbackContext object. This way the app won't crash and the result will be available on the on resume event. I will make a pull-request with this solution.

import android.os.Bundle;

public void onRestoreStateForActivityResult(Bundle state, CallbackContext callbackContext) {
    this.callbackContext = callbackContext;
}

Actual Behaviour

If the phone settings are set to kill background tasks or there is any other cleaner that kills the main app activity, then the plugins returns to the app with a null object and crashes the app.

Reproduce Scenario (including but not limited to)

Any app with the scanner in Android.

Steps to Reproduce

In any phone, in developer options set "Don't keep activities" to true. Now when scanning a code you won't be able to get the result in the app once it opens again.

Platform and Version (eg. Android 5.0 or iOS 9.2.1)

Any Android, tested on 5.0.

(Android) What device vendor (e.g. Samsung, HTC, Sony...)

Any Vendor, tested on an LG G3.

Cordova CLI version and cordova platform version

Any version of cordova, tested on 4.4.2.

Plugin version

cordova plugin version | grep phonegap-plugin-barcodescanner 6.0.1

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