Question

我有一个覆盖bulkInsert()的MyContentProvider类。在此方法中，我使用SQLite事务将大约4,000行插入数据库，这在Samsung Galaxy S4设备上大约需要25秒。

但是，当我从bulkInsert()方法删除这一行时......

getContext().getContentResolver().notifyChange(insertedId, null);

...总插入时间下降到大约1或2秒。

那么，是否有更好的方式来呼叫notifyChange()？

我试过在另一个线程中调用它，就像这样......

                    new Thread(new Runnable() {
                    public void run() {
                        getContext().getContentResolver().notifyChange(insertedId, null);
                    }
                }).start();

......但它仍然很慢，并且出于某种原因导致OutOfMemoryError。

为了完整性，这是我的bulkInsert()方法......

    @Override
public int bulkInsert(Uri uri, ContentValues[] valuesArray) {

    /*
     *  Open a read / write database to support the transaction.
     */
    SQLiteDatabase db = dbHelper.getWritableDatabase();

    String tableName;

    switch (uriMatcher.match(uri)) {
        case BRANDS_SEARCH:
            tableName = BRAND_NAMES_TABLE;
            break;
        case PRODUCTS_SEARCH:
            tableName = PRODUCTS_TABLE;
            break;
        case PARENT_COMPANIES_SEARCH:
            tableName = PARENT_COMPANIES_TABLE;
            break;
        case PRODUCTS_DATA_SEARCH:
            tableName = PRODUCTS_DATA_TABLE;
            break;
        default:
            //break;
            throw new IllegalArgumentException("Unsupported URI: " + uri);
    }

    /*
     * Begin the transaction
     */
    db.beginTransaction();

    int numSuccessfulInsertions = 0;

    try {

        for (int i = 0; i < valuesArray.length; i++) {

            /*
             *  Insert the values into the table
             */
            long rowId = db.insert(tableName, null, valuesArray[i]);

            if (rowId > -1) {

                /*
                 * Increment numSuccessfulInsertions
                 */
                numSuccessfulInsertions++;

                /*
                 *  Construct the URI of the newly inserted row.
                 */
                Uri insertedId = ContentUris.withAppendedId(uri, rowId);

                /*
                 *  Notify any observers of the change in the data set.
                 */
                getContext().getContentResolver().notifyChange(insertedId, null);



            }
            else {

                /*
                 * Don't give up (as not all insert attempts need to succeed)
                 */
                //throw new Exception("Could not insert row");
            }

        }

        /*
         * Return number of successful insertions
         */
        return numSuccessfulInsertions;
    }
    catch(Exception e) {

        Log.e(LOG_TAG, "bulkInsert exception", e);

        /*
         * Return number of successful insertions
         */
        return numSuccessfulInsertions;

    }
    finally {

        /*
         * Some (or all) insertion attempts succeeded
         */
        db.setTransactionSuccessful();

        /*
         * Always end the transaction
         */
        db.endTransaction();
    }
}

Answer 1

通知一次批量操作，而不是每次插入的记录一次。将您的调用移至notifyChange，使其跟随for循环。

Android - contentResolver.notifyChange（）降低性能

1 个答案: