rx代替AsyncTask

最新推荐文章于 2024-08-28 04:09:29 发布

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本文介绍了一个使用RxJava和AndroidSchedulers实现的发票信息加载工具类。该工具类通过数据库查询当前用户的发票信息，并返回一个Observable对象，方便在UI线程中订阅并更新视图。

rx1.2.1

public class InvoiceUtils {
    public static Observable<Invoice> getLocalInvoice(final Context context) {
        return Observable.create(new Observable.OnSubscribe<Invoice>() {
            @Override
            public void call(Subscriber<? super Invoice> subscriber) {
                subscriber.onNext(getInvoice(context));
                subscriber.onCompleted();
            }
        }).subscribeOn(Schedulers.io()).observeOn(AndroidSchedulers.mainThread());
    }

    private static Invoice getInvoice(Context context) {
        Cursor cursor = DbHelper.getInstance(context).query(TInvoice.TNAME, " where " + TInvoice.ACCOUNT + "='" + UserInfoKeeper.getCurrentUser().getAccount() + "'");
        if (cursor.getCount() == 0) {
            return null;
        }

        cursor.moveToNext();

        Invoice invoice = new Invoice();
        invoice.setInvoiceTitle(cursor.getString(cursor.getColumnIndex(TInvoice.INVOICETITLE)));
        invoice.setInvoiceBandAccount(cursor.getString(cursor.getColumnIndex(TInvoice.INVOICEBANDACCOUNT)));
        invoice.setInvoiceFlag(cursor.getInt(cursor.getColumnIndex(TInvoice.INVOICEFLAG)));
        invoice.setInvoiceBandName(cursor.getString(cursor.getColumnIndex(TInvoice.INVOICEBANDNAME)));
        invoice.setInvoiceToAddress(cursor.getString(cursor.getColumnIndex(TInvoice.INVOICETOADDRESS)));
        invoice.setInvoiceToTel(cursor.getString(cursor.getColumnIndex(TInvoice.INVOICETOTEL)));
        invoice.setInvoiceToContact(cursor.getString(cursor.getColumnIndex(TInvoice.INVOICETOCONTACT)));
        invoice.setInvoiceFromAddress(cursor.getString(cursor.getColumnIndex(TInvoice.INVOICEFROMADDRESS)));
        invoice.setInvoiceFromTel(cursor.getString(cursor.getColumnIndex(TInvoice.INVOICEFROMTEL)));
        invoice.setInvoiceType(cursor.getInt(cursor.getColumnIndex(TInvoice.INVOICETYPE)));
        invoice.setInvoiceIdentifyId(cursor.getString(cursor.getColumnIndex(TInvoice.INVOICEIDENTIFYID)));

        cursor.close();

        return invoice;
    }


}

要使用的地方：

InvoiceUtils.getLocalInvoice(this).subscribe(new Subscriber<Invoice>() {
            @Override
            public void onCompleted() {

            }

            @Override
            public void onError(Throwable e) {

            }

            @Override
            public void onNext(Invoice invoice) {
                if (invoice != null) {
                    if (!TextUtils.isEmpty(invoice.getInvoiceTitle())) {
                        if (invoice != null) {
                            setViews(invoice);
                        } else {
                            // 本地为空，去网络获取，存于本地
                            presenter.getInvoiceInfo();
                        }
                    }
                }
            }
        });