Fixed app crashing for android api verison < 26

folioreader/build.gradle

@@ -15,7 +15,7 @@ ext {
     siteUrl = 'https://github.com/FolioReader/FolioReader-Android'
     gitUrl = 'https://github.com/FolioReader/FolioReader-Android.git'
 
-    libraryVersion = '0.3.7'
+    libraryVersion = '0.3.8'
 
     developerId = 'mobisystech'
     developerName = 'Folio Reader'

folioreader/src/main/java/com/folioreader/FolioReader.java

@@ -5,6 +5,7 @@
 import android.content.Context;
 import android.content.Intent;
 import android.content.IntentFilter;
+import android.os.Build;
 import android.os.Parcelable;
 import android.support.v4.content.LocalBroadcastManager;
 
@@ -79,7 +80,7 @@ private FolioReader() {
 
     private FolioReader(Context context) {
         this.context = context;
-        new DbAdapter(context);
+        DbAdapter.initialize(context);
         LocalBroadcastManager.getInstance(context).registerReceiver(highlightReceiver,
                 new IntentFilter(HighlightImpl.BROADCAST_EVENT));
         LocalBroadcastManager.getInstance(context).registerReceiver(readPositionReceiver,
@@ -157,6 +158,8 @@ public FolioReader openBook(String assetOrSdcardPath, Config config, String book
     private Intent getIntentFromUrl(String assetOrSdcardPath, int rawId) {
 
         Intent intent = new Intent(context, FolioActivity.class);
+        if (Build.VERSION.SDK_INT <= Build.VERSION_CODES.M)
+            intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_MULTIPLE_TASK);
         intent.putExtra(FolioActivity.EXTRA_READ_POSITION, (Parcelable) readPosition);
 
         if (rawId != 0) {
@@ -192,12 +195,37 @@ public void saveReceivedHighLights(List<HighLight> highlights, OnSaveHighlight o
         new SaveReceivedHighlightTask(onSaveHighlight, highlights).execute();
     }
 
-    public static void clear() {
+    /**
+     * Nullifies readPosition and listeners.
+     * This method ideally should be used in onDestroy() of Activity or Fragment.
+     * Use this method if you want to use FolioReader singleton instance again in the application,
+     * else use {@link #stop()} which destruct the FolioReader singleton instance.
+     */
+    public static synchronized void clear() {
 
         if (singleton != null) {
             singleton.readPosition = null;
             singleton.onHighlightListener = null;
             singleton.readPositionListener = null;
         }
     }
+
+    /**
+     * Destructs the FolioReader singleton instance.
+     * Use this method only if you are sure that you won't need to use
+     * FolioReader singleton instance again in application, else use {@link #clear()}.
+     */
+    public static synchronized void stop() {
+
+        if (singleton != null) {
+            DbAdapter.terminate();
+            singleton.unregisterListeners();
+            singleton = null;
+        }
+    }
+
+    private void unregisterListeners() {
+        LocalBroadcastManager.getInstance(context).unregisterReceiver(highlightReceiver);
+        LocalBroadcastManager.getInstance(context).unregisterReceiver(readPositionReceiver);
+    }
 }

folioreader/src/main/java/com/folioreader/model/sqlite/DbAdapter.java

@@ -9,14 +9,16 @@
 public class DbAdapter {
     private static final String TAG = "DBAdapter";
 
-    private Context mContext;
     public static SQLiteDatabase mDatabase;
 
-    public DbAdapter(Context ctx) {
-        this.mContext = ctx;
+    public static void initialize(Context mContext) {
         mDatabase = FolioDatabaseHelper.getInstance(mContext).getMyWritableDatabase();
     }
 
+    public static void terminate() {
+        FolioDatabaseHelper.clearInstance();
+    }
+
     public static boolean insert(String table, ContentValues contentValues) {
 
         return mDatabase.insert(table, null, contentValues) > 0;

folioreader/src/main/java/com/folioreader/model/sqlite/FolioDatabaseHelper.java

@@ -30,6 +30,10 @@ public static FolioDatabaseHelper getInstance(Context context) {
         return mInstance;
     }
 
+    public static void clearInstance() {
+        mInstance = null;
+    }
+
     public SQLiteDatabase getMyWritableDatabase() {
         if ((myWritableDb == null) || (!myWritableDb.isOpen())) {
             myWritableDb = this.getWritableDatabase();

webViewMarker/build.gradle

@@ -13,7 +13,7 @@ ext {
     siteUrl = 'https://github.com/FolioReader/FolioReader-Android'
     gitUrl = 'https://github.com/FolioReader/FolioReader-Android.git'
 
-    libraryVersion = '0.3.7'
+    libraryVersion = '0.3.8'
 
     developerId = 'mobisystech'
     developerName = 'Folio Reader'