[Android]: Database locale issues (#423)

Make sure that we close db connection when 'host' is destroyed and re-create it when needed

Author: Krzysztof

android/src/main/java/com/reactnativecommunity/asyncstorage/AsyncStorageModule.java

@@ -15,6 +15,7 @@
 import com.facebook.react.bridge.Arguments;
 import com.facebook.react.bridge.Callback;
 import com.facebook.react.bridge.GuardedAsyncTask;
+import com.facebook.react.bridge.LifecycleEventListener;
 import com.facebook.react.bridge.ReactApplicationContext;
 import com.facebook.react.bridge.ReactContextBaseJavaModule;
 import com.facebook.react.bridge.ReactMethod;
@@ -33,7 +34,7 @@
 
 @ReactModule(name = AsyncStorageModule.NAME)
 public final class AsyncStorageModule
-    extends ReactContextBaseJavaModule implements ModuleDataCleaner.Cleanable {
+    extends ReactContextBaseJavaModule implements ModuleDataCleaner.Cleanable, LifecycleEventListener {
 
   // changed name to not conflict with AsyncStorage from RN repo
   public static final String NAME = "RNC_AsyncSQLiteDBStorage";
@@ -91,6 +92,7 @@ public AsyncStorageModule(ReactApplicationContext reactContext) {
   AsyncStorageModule(ReactApplicationContext reactContext, Executor executor) {
     super(reactContext);
     this.executor = new SerialExecutor(executor);
+    reactContext.addLifecycleEventListener(this);
     mReactDatabaseSupplier = ReactDatabaseSupplier.getInstance(reactContext);
   }
 
@@ -118,6 +120,18 @@ public void clearSensitiveData() {
     mReactDatabaseSupplier.clearAndCloseDatabase();
   }
 
+  @Override
+  public void onHostResume() {}
+
+  @Override
+  public void onHostPause() {}
+
+  @Override
+  public void onHostDestroy() {
+    // ensure we close database when activity is destroyed
+    mReactDatabaseSupplier.closeDatabase();
+  }
+
   /**
    * Given an array of keys, this returns a map of (key, value) pairs for the keys found, and
    * (key, null) for the keys that haven't been found.

android/src/main/java/com/reactnativecommunity/asyncstorage/ReactDatabaseSupplier.java

@@ -7,15 +7,13 @@
 
 package com.reactnativecommunity.asyncstorage;
 
-import javax.annotation.Nullable;
-
 import android.content.Context;
 import android.database.sqlite.SQLiteDatabase;
 import android.database.sqlite.SQLiteException;
 import android.database.sqlite.SQLiteOpenHelper;
-
 import com.facebook.common.logging.FLog;
 import com.facebook.react.common.ReactConstants;
+import javax.annotation.Nullable;
 
 /**
  * Database supplier of the database used by react native. This creates, opens and deletes the
@@ -151,7 +149,7 @@ private synchronized boolean deleteDatabase() {
     return mContext.deleteDatabase(DATABASE_NAME);
   }
 
-  private synchronized void closeDatabase() {
+  public synchronized void closeDatabase() {
     if (mDb != null && mDb.isOpen()) {
       mDb.close();
       mDb = null;