Add android build script

Author: mrousavy

package.json

@@ -25,9 +25,11 @@
     "test": "jest",
     "typescript": "tsc --noEmit",
     "lint": "eslint \"**/*.{js,ts,tsx}\"",
-    "prepare": "bob build",
+    "prepare": "bob build && scripts/build-android.sh",
     "release": "release-it",
-    "bootstrap": "yarn && cd example && yarn && cd ios && pod install"
+    "bootstrap": "yarn && cd example && yarn && cd ios && pod install",
+    "prepublish": "rm -rf android-backup && mv android android-backup && mv android-npm android",
+    "postpublish": "mv android android-npm && mv android-backup android"
   },
   "keywords": [
     "react-native",

scripts/build-android.sh

@@ -0,0 +1,21 @@
+#!/bin/bash
+
+CWD="$( cd -- "$(dirname "$0")" >/dev/null 2>&1 ; pwd -P )"
+
+cd $CWD
+cd ..
+
+echo 'Building Android in:'
+echo $PWD
+
+cd android
+rm -rf build/
+
+./gradlew clean
+./gradlew assembleDebug assembleRelease
+
+rm -rf ../android-npm
+mkdir ../android-npm
+
+shopt -s dotglob nullglob
+mv -v build/outputs/aar/* ../android-npm