/**
* 获取缓存中的数据库
*
* @param dbfile assets里的数据库路径
*/
public SQLiteDatabase getDatabase(String dbfile) {
SQLiteDatabase db = databases.get(dbfile);
if (db != null && db.isOpen()) {
if (SQLiteDebug.isDebug) {
Log.i(TAG, String.format("Return a database copy of %s", dbfile));
}
return (SQLiteDatabase) databases.get(dbfile);
}
return null;
}
/** Close all assets database */
public static void closeAllDatabase() {
if (SQLiteDebug.isDebug) {
Log.i(TAG, "closeAllDatabase");
}
if (mInstance != null) {
Set<String> set = mInstance.databases.keySet();
Iterator<String> iterator = set.iterator();
while (iterator.hasNext()) {
String key = iterator.next();
SQLiteDatabase db = mInstance.databases.get(key);
if (db.isOpen()) {
db.close();
}
iterator.remove();
}
}
}
/**
* Get a assets database, if this database is opened this method is only return a copy of the
* opened database
*
* @param dbfile db文件路径(在assets中的文件路径)
* @param passwd 密码
* @return, if success it return a SQLiteDatabase object else return null
*/
public SQLiteDatabase getDatabase(String dbfile, String passwd) {
SQLiteDatabase db = databases.get(dbfile);
if (db != null && db.isOpen()) {
if (SQLiteDebug.isDebug) {
Log.i(TAG, String.format("Return a database copy of %s", dbfile));
}
return (SQLiteDatabase) databases.get(dbfile);
}
if (context == null) return null;
if (SQLiteDebug.isDebug) {
Log.i(TAG, String.format("Create database %s", dbfile));
}
String spath = databasepath;
String sfile = getDatabaseFile(dbfile);
File file = new File(sfile);
SharedPreferences dbs = context.getSharedPreferences(AssetsDatabaseManager.class.toString(), 0);
// Get Database file flag, if true means this database file was copied and valid
boolean flag = dbs.getBoolean(dbfile, false);
if (!flag || !file.exists()) {
file = new File(spath);
if (!file.exists() && !file.mkdirs()) {
if (SQLiteDebug.isDebug) {
Log.i(TAG, "Create \"" + spath + "\" fail!");
}
return null;
}
if (!copyAssetsToFilesystem(dbfile, sfile)) {
if (SQLiteDebug.isDebug) {
Log.i(TAG, String.format("Copy %s to %s fail!", dbfile, sfile));
}
return null;
}
dbs.edit().putBoolean(dbfile, true).commit();
}
db = SQLiteDatabase.openDatabase(sfile, passwd, null, SQLiteDatabase.NO_LOCALIZED_COLLATORS);
if (db != null) {
databases.put(dbfile, db);
}
return db;
}