How do I force sqlite to merge journal file into main database?

I have an app that writes to the databases with transactions. I understand that sqlite will write to the journal file and then merge it in once the journal file gets to a certain size. I also have functionality that will try and copy the database file to another location. My problem is I can't find a way to force sqlite to merge the journal into the main database.

All of my queries look something like this

SQLiteDatabase database =null;
try{
    database = getReadableDatabase();

    //PERFORM SOME INSERT

   }
   catch (Exception e){
            Log.e(TAG, "Error with insert");
   }
   finally {
        if( database != null){
            database.close();
        }
  }

After these methods execute I will close the app and inspect the directory where the app saves its database. I can see the database file and database-journal.

I am trying to do something like

public void copyDatabase(){
    //FORCE MERGE

    //DO OTHER OPERATIONS
}

Does somebody have any ideas on how to merge the journal file when needed?