Query if Android database exists!

I'd rather check the existence of the file directly:

private static boolean doesDatabaseExist(Context context, String dbName) {
    File dbFile = context.getDatabasePath(dbName);
    return dbFile.exists();
}

/**
 * Check if the database exist and can be read.
 * 
 * @return true if it exists and can be read, false if it doesn't
 */
private boolean checkDataBase() {
    SQLiteDatabase checkDB = null;
    try {
        checkDB = SQLiteDatabase.openDatabase(DB_FULL_PATH, null,
                SQLiteDatabase.OPEN_READONLY);
        checkDB.close();
    } catch (SQLiteException e) {
        // database doesn't exist yet.
    }
    return checkDB != null;
}

where DB_FULL_PATH is the path to your database file.

And the reason I am not just checking if a file exists is because it would not tell whether (a) it's an sqlite db file, (b) the file is not corrupt and can actually be read, i.e. due to partial download or however it has been created.