Android 方法 openOrCreateDatabase(String, int, null) 未定义
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The method openOrCreateDatabase(String, int, null) is undefined
提问by Saurabh Verma
I'm trying to open database as follows :
我正在尝试按如下方式打开数据库：
SQLiteDatabase myDatabase;
myDatabase = openOrCreateDatabase("sudoku.db", Context.MODE_PRIVATE, null);
This code works fine when I implement it in the Service class, but when I try to implement this in the onPostExecute eventhandler of the GeneraterThread class,implementing AsyncTask, I get the following error :
当我在 Service 类中实现它时，此代码工作正常，但是当我尝试在 GeneraterThread 类的 onPostExecute 事件处理程序中实现它时，实现 AsyncTask，我收到以下错误：
The method openOrCreateDatabase(String, int, null) is undefined for the type GeneraterThread
The method openOrCreateDatabase(String, int, null) is undefined for the type GeneraterThread
采纳答案by Konstantin Burov
It looks like you're trying to invoke openOrCreateDatabase method on GeneraterThread instance which doesn't have the method (and Service class has the method). You probably may pass in a reference to a Context object and invoke the method on it. Or use static method of SQLiteDatabase.openOrCreateDatabase().
看起来您正在尝试在没有该方法的 GeneraterThread 实例上调用 openOrCreateDatabase 方法（而 Service 类具有该方法）。您可能会传入对 Context 对象的引用并调用其上的方法。或者使用 SQLiteDatabase.openOrCreateDatabase() 的静态方法。
回答by a4vi2r
It looks like your just set wrong arguments for function.
看起来您刚刚为函数设置了错误的参数。
There are these definitions in SDK:
SDK中有这些定义：
public static SQLiteDatabase openOrCreateDatabase (String path, SQLiteDatabase.CursorFactory factory, DatabaseErrorHandler errorHandler)
public static SQLiteDatabase openOrCreateDatabase (String path, SQLiteDatabase.CursorFactory factory)
public static SQLiteDatabase openOrCreateDatabase (File file, SQLiteDatabase.CursorFactory factory)
But your calling that function is wrong.
但是你调用那个函数是错误的。
Maybe you wanted to call openDatabase (String path, SQLiteDatabase.CursorFactory factory, int flags)?
也许你想打电话openDatabase (String path, SQLiteDatabase.CursorFactory factory, int flags)？
In this case you just set arguments in wrong order - you're doing
在这种情况下，您只是以错误的顺序设置参数-您正在做
openOrCreateDatabase("sudoku.db", Context.MODE_PRIVATE, null); //WRONG
instead:
反而：
openDatabase("sudoku.db", null, Context.MODE_PRIVATE); //RIGHT
回答by Pentium10
Use it with your parent class
与您的父类一起使用
something like
就像是
myService.this.openOrCreateDatabase
回答by Ali Bagheri
its better use this,
它更好地使用这个，
db = SQLiteDatabase.openOrCreateDatabase(DATABASE_PATH_AND_NAME, null);
db.close();
db = SQLiteDatabase.openDatabase(DATABASE_PATH_AND_NAME, null, Context.MODE_APPEND);
