[android] Make sure to have only one instance of CodePush

Author: Minishlink

android/app/src/main/java/com/appzung/codepush/react/CodePush.java

@@ -19,6 +19,19 @@
 import java.util.List;
 
 public class CodePush implements ReactPackage {
+    private static final Object LOCK = new Object();
+    private static volatile CodePush mCurrentInstance;
+
+    public static CodePush getInstance(Context context) {
+        if (mCurrentInstance == null) {
+            synchronized (LOCK) {
+                if (mCurrentInstance == null) {
+                    mCurrentInstance = new CodePush(context);
+                }
+            }
+        }
+        return mCurrentInstance;
+    }
 
     private static boolean sIsRunningBinaryVersion = false;
     private static boolean sNeedToReportRollback = false;
@@ -47,13 +60,11 @@ public class CodePush implements ReactPackage {
 
     private static ReactHostHolder mReactHostHolder;
 
-    private static CodePush mCurrentInstance;
-
     public static String getServiceUrl() {
         return mServerUrl;
     }
 
-    public CodePush(Context context) {
+    private CodePush(Context context) {
         mContext = context.getApplicationContext();
 
         String releaseChannelPublicIdFromStrings = getCustomPropertyFromStringsIfExist("ReleaseChannelPublicId");

react-native.config.js

@@ -2,7 +2,7 @@ module.exports = {
   dependency: {
     platforms: {
       android: {
-        packageInstance: 'new CodePush(getApplicationContext())',
+        packageInstance: 'CodePush.getInstance(getApplicationContext())',
         sourceDir: './android/app',
       },
     },