/**
    * Checks whether this looks like a legitimate selection parameter
    */
   public static void validateSelection(String selection,
    Set<String> allowedColumns) {
try {
    if (selection == null || selection.length() == 0) {
	return;
    }
    Lexer lexer = new Lexer(selection, allowedColumns);
    parseExpression(lexer);
    if (lexer.currentToken() != Lexer.TOKEN_END) {
	throw new IllegalArgumentException("syntax error");
    }
} catch (RuntimeException ex) {
    if (Constants.LOGV) {
	Log.d(Constants.TAG, "invalid selection [" + selection
		+ "] triggered " + ex);
    } else if (Config.LOGD) {
	Log.d(Constants.TAG, "invalid selection triggered " + ex);
    }
    throw ex;
}

   }
 

@Override
public final void onClick(View v) {
    final long lastClickTime = mLastClickTime;
    final long now = SystemClock.uptimeMillis(); //guaranteed 100% monotonic

    if (now - lastClickTime < MIN_DELAY_MS && !override) {
        // Too fast: ignore
        if (Config.LOGD) {
            Log.d(TAG, "onClick Clicked too quickly: ignored");
        }
    } else {
        override = false;
        // Update mLastClickTime and register the click
        mLastClickTime = now;
        onSingleClick(v);
    }
}
 

private DBHelper(Context context) {
    DaoMaster.DevOpenHelper helper = new DaoMaster.DevOpenHelper(context, DB_NAME, null);
    db = helper.getWritableDatabase();
    // 注意：该数据库连接属于 DaoMaster，所以多个 Session 指的是相同的数据库连接。
    DaoMaster daoMaster = new DaoMaster(db);
    daoSession = daoMaster.newSession();
    if(Config.DEBUG) {
        QueryBuilder.LOG_SQL = true;
        QueryBuilder.LOG_VALUES = true;
    }
}