我有一個sqlitedatabase我在我的應用程序中實現,我在啓動時不斷收到IllegalStateException。遊標,SQLite和查詢
09-21 22:48:26.749 15762-16277/nz.co.exium.panther E/AndroidRuntime﹕ FATAL EXCEPTION: SyncAdapterThread-2
java.lang.IllegalStateException: Couldn't read row 0, col 4 from CursorWindow. Make sure the Cursor is initialized correctly before accessing data from it.
at android.database.CursorWindow.nativeGetString(Native Method)
at android.database.CursorWindow.getString(CursorWindow.java:438)
at android.database.AbstractWindowedCursor.getString(AbstractWindowedCursor.java:51)
at android.database.CursorWrapper.getString(CursorWrapper.java:114)
at nz.co.exium.panther.sync.PantherSyncAdapter.getRegistrationId(PantherSyncAdapter.java:269)
at nz.co.exium.panther.sync.PantherSyncAdapter.onPerformSync(PantherSyncAdapter.java:64)
at android.content.AbstractThreadedSyncAdapter$SyncThread.run(AbstractThreadedSyncAdapter.java:254)
我相信這是由查詢返回相當空表(除了被自動增量_ID)引起的,然後當我嘗試從光標的字符串。
String registrationID = "";
Uri uri = CustomerEntry.CONTENT_URI;
Cursor cursor = mContext.getContentResolver().query(uri, CUSTOMER_PROJECTION, null, null, null);
if (cursor.moveToFirst()) {
registrationID = cursor.getString(INDEX_CUST_REGID);
}
SQL創建表調用:
final String SQL_CREATE_CUSTOMER_TABLE = "CREATE TABLE " + CustomerEntry.TABLE_NAME + " (" +
CustomerEntry._ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " +
CustomerEntry.COLUMN_CUST_NAME + " TEXT NOT NULL, " +
CustomerEntry.COLUMN_CUST_EMAIL + " TEXT NOT NULL, " +
CustomerEntry.COLUMN_CUST_QRHASH + " TEXT NOT NULL," +
CustomerEntry.COLUMN_CUST_REGID + " TEXT NOT NULL)";
在這種情況下,INDEX_CUST_REGID是最終靜態INT相關於字符串[]投影的位置,第三在這種情況下的位置。這是有道理的,但有沒有一種方法或方法來查詢SyncAdapter的特定列,如CUST_REGID或方法來檢查請求的列是否在嘗試cursor.getString()之前返回?
這也可以解決另一個問題,我知道EMAIL,名稱,QRHASH之前保存註冊ID。不能只插入一列而沒有其他值(NOT NULL),即使這將是無價值的數據並儘快覆蓋。
嘗試存儲註冊ID的方法。根據要求
private void storeRegistrationID(Context context, String regID) {
//DB insert regid
ContentValues cValues = new ContentValues();
cValues.put(CustomerEntry.COLUMN_CUST_NAME, "");
cValues.put(CustomerEntry.COLUMN_CUST_EMAIL, "");
cValues.put(CustomerEntry.COLUMN_CUST_QRHASH, "");
cValues.put(CustomerEntry.COLUMN_CUST_REGID, regID);
mContext.getContentResolver().insert(CustomerEntry.CONTENT_URI, cValues);
}
投影:
String[] CUSTOMER_PROJECTION = new String[]{
CustomerEntry._ID,
CustomerEntry.COLUMN_CUST_NAME,
CustomerEntry.COLUMN_CUST_EMAIL,
CustomerEntry.COLUMN_CUST_QRHASH,
CustomerEntry.COLUMN_CUST_REGID
};
顯示投影。 – 2014-09-21 12:37:24