android – 光标窗口分配2048 kb失败. #Open Cursors = 1(此proc = 1打开的#游标)

我正在制作一个使用数据库的Kiosk应用程序.该应用程序一直在前台运行.该应用程序有许多使用一个共享DataBaseHelper实例的线程.该应用程序完美无缺,但大多数时间在5或6小时后,我遇到这些异常,然后应用程序崩溃：

E/DataBaseHelper﹕ Cursor window allocation of 2048 kb failed. # Open
Cursors=1 (# cursors opened by this proc=1)

E/CursorWindow﹕ Could not allocate CursorWindow
‘/data/user/0/com.kios.frm/databases/YadProjectDB.db’ of
size 2097152 due to error -24.

E/SQLiteLog﹕ (14) cannot open file at line 30192 of [00bb9c9ce4]

E/SQLiteLog﹕ (14) statement aborts at 16: [SELECT number FROM sms
LIMIT 5] unable to open database file

E/SQLiteQuery﹕ exception: unable to open database file (code 14);
query: SELECT number FROM sms LIMIT 5

E/SQLiteLog﹕ (14) os_unix.c:30192: (24)
open(/data/user/0/com.kiosk.frm/databases/YadProjectDB.db-journal)-

我正确关闭了光标,但仍然获得了这些异常.那些例外是什么？这些例外的原因是什么？

主要活动

private DataBaseHelper db = null; // Global

MainActivity onCreate方法：

db = new DataBaseHelper(this);

new Thread(new Runnable() {
@Override
public void run() {
    while (threadRunningFlag) {

    Cursor result = null;
    try {

        result = db.getData("SELECT " + DataBaseHelper.SMS_COLUMN_PHONE_NUMBER  + " FROM " + DataBaseHelper.SMS_TABLE_NAME + " LIMIT 5");
        if (result != null && result.getCount() > 0) {
            while (!result.isAfterLast()) {
                String phoneNumber = result.getString(result.getColumnIndex(DataBaseHelper.SMS_COLUMN_PHONE_NUMBER));
                // ...
                result.moveToNext();
            }
        }
    }catch (Exception e) {
        Log.e(TAG,"err->" + e.getLocalizedMessage());

    }finally {
        if (result != null) {
            result.close();
            result = null;
        }
    }

        try {
            Thread.sleep(1000);
        } catch (InterruptedException e) {
            Log.e(TAG,e.getMessage());
        }
    }
}
}).start();

DataBaseHelper类：

public class DataBaseHelper extends SQLiteOpenHelper {

    private static final int DATABASE_VERSION = 1;
    public static final String DATABASE_NAME = "YadProjectDB.db";
    public static final String SMS_TABLE_NAME = "sms";
    public static final String SMS_COLUMN_PHONE_NUMBER = "number";
    public static final String SMS_COLUMN_SMS_TEXT = "message";

    public static final String BLACK_LIST_TABLE_NAME = "blackList";
    public static final String BLACK_LIST_COLUMN_ID = "id";
    public static final String BLACK_LIST_COLUMN_PHONE_NUMBER = "number";

    private final String TAG = "DataBaseHelper";

    public DataBaseHelper(Context context) {
        super(context,DATABASE_NAME,null,DATABASE_VERSION);

    }

    @Override
    public void onCreate( SQLiteDatabase db ) {
        String command = "CREATE TABLE "
                + SMS_TABLE_NAME
                + "("
                + SMS_COLUMN_PHONE_NUMBER + " TEXT,"
                + SMS_COLUMN_SMS_TEXT + " TEXT,"
                + ")";
        try {
            db.execSQL(command);
        }catch (Exception e) {
            Log.e(TAG,"err->" + e.getMessage());
        }

        command = "CREATE TABLE "
                + BLACK_LIST_TABLE_NAME
                + "("
                + BLACK_LIST_COLUMN_PHONE_NUMBER + " TEXT,"err->" +  e.getMessage());
        }
    }

    public boolean insertToSms(String number,String message,String fileName,Integer uploadFlag,Integer blackList,Integer pictureFlag)
    {
        final SQLiteDatabase db = this.getWritableDatabase();
        ContentValues contentValues = new ContentValues();
        contentValues.put(SMS_COLUMN_PHONE_NUMBER,number);
        contentValues.put(SMS_COLUMN_SMS_TEXT,message);
        try {
            db.insert(SMS_TABLE_NAME,contentValues);
            return true;
        }catch (Exception e) {
            Log.e(TAG,"err->" + e.getMessage());
            return false;
        }
    }

    public Cursor getData(String query){
        final SQLiteDatabase db = getReadableDatabase();
        Cursor res = null;
        try {
            res = db.rawQuery(query,null);
            res.moveToFirst();
            return res;
        }catch (Exception e) {
            Log.e(TAG,"err->" + e.getMessage());
            if (res != null) {
                res.close();
                res = null;
            }
        }
        return null;
    }
}

解决方法

这与 SQLite Android Database Cursor window allocation of 2048 kb failed看起来相同

你的错误说：“打开游标”

上述问题的答案解释了：

Most often the cause for this error are non closed cursors. Make sure
you close all cursors after using them (even in the case of an error).

Cursor cursor = null;
try {
    cursor = db.query(...
    // do some work with the cursor here.
} finally {
    // this gets called even if there is an exception somewhere above
    if(cursor != null)
        cursor.close();
}