Arkui FAQ summary [Series 2]

Today, I continue to sort out some problems encountered in the community

These are some of the questions I have answered , If you can really help developers , Then I'm honored

problem 1.ETS The application of cannot be in P40 Run on simulator ？

answer ,P40 The simulator is API 6,P40 PRO It's just API 7, then P50 yes API8, So when you use the simulator, look at your project using API That version of , Find the right one for you .

problem 2. data storage SharePreference How to use ？

answer ：

1. The import module ：import data_storage from '@ohos.data.storage';

2. Get the to be operated Storage example , Used for data storage operations The internal data storage path of the application is in brackets .

static store = data_storage.getStorageSync('/data/data/' + “string” );

3. Storing data

store .putSync(userId, value)

store.flushSync()

problem 3.ets How to load video resources ?

This loading method , Unable to play video on the development board .

answer , You are using DevEco Studio 3.0.0.900, There is no such thing as rawfile Resource folder , This version is uncommon by default , So we can't use this way of introduction , It's about using $r("app.media.viedeo.mp4")

problem 4.ETS Support chart Components ？

answer ： It is not supported yet

problem 5. Excuse me, ets How to do it? Http request

ArkUI Development framework in @ohos.net.http The module provides network request related API,

• launch http Network request requires application ohos.permission.INTERNET jurisdiction .

• launch http The number of concurrent network requests is limited to 100 , Subsequent requests that exceed this limit will fail .

• The default support https , If you want to support http , Need to be in config.json Increase in network label , Attribute identification "cleartextTraffic": true.

@ohos.net.http Module defined API The notes are very clear , First call createHttp() Method to get a HttpRequest example , And then call HttpRequest Of request() Method to send a network request .

Use @ohos.net.http The network request initiated by the module is divided into the following steps ：

1. introduce http modular

import http from '@ohos.net.http';

2. Create a httpRequest

let httpRequest = http.createHttp();

3. launch http request

httpRequest Two types are available request() Method to make a network request , Respectively none RequestOptions The request and of parameters have RequestOptions Request for parameters .

Specific use , You can see my article ： Application of Hongmeng Tibetan poems