HarmonyOS能否提供一个NFC识别的demo

HarmonyOS能否提供一个NFC识别的demo。

HarmonyOS

put_get

2024-09-09 10:06:05

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回答 2

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zxjiu

需要在应用的属性配置文件中，声明与NFC相关的属性值。比如，在module.json5文件中，声明下面属性值：

{ 
  "module": { 
  "abilities": [ 
  { 
    "skills": [ 
    { 
      "actions": [ 
      "ohos.nfc.tag.action.TAG_FOUND" 
      ], 
      "uris": [ 
      { 
        "type":"tag-tech/NfcA" 
      }, 
      { 
        "type":"tag-tech/IsoDep" 
      } 
      ] 
    } 
    ] 
  } 
  ], 
  "requestPermissions": [ 
  { 
    "name": "ohos.permission.NFC_TAG", 
  "reason": "tag", 
  } 
  ] 
} 
}1.
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以下是相关代码：

import tag from '@ohos.nfc.tag'; 
import UIAbility from '@ohos.app.ability.UIAbility'; 
import AbilityConstant from '@ohos.app.ability.AbilityConstant'; 
import Want from '@ohos.app.ability.Want' 
export default class EntryAbility extends UIAbility { 
  onCreate(want : Want, launchParam: AbilityConstant.LaunchParam) { 
    // add other code here... 
    // want is initialized by nfc service, contains tag info for this found tag 
    let tagInfo : tag.TagInfo | null = null; 
    try { 
      tagInfo = tag.getTagInfo(want); 
    } catch (error) { 
      console.error("tag.getTagInfo catched error: " + error); 
    } 
    if (tagInfo == null || tagInfo == undefined) { 
      console.log("no TagInfo to be created, ignore it."); 
      return; 
    } 
    // get the supported technologies for this found tag. 
    let isNfcATag =  false; 
    let isIsoDepTag =  false; 
    for (let i = 0; i < tagInfo.technology.length; i++) { 
      if (tagInfo.technology[i] == tag.NFC_A) { 
        isNfcATag = true; 
      } 
 
      if (tagInfo.technology[i] == tag.ISO_DEP) { 
        isIsoDepTag = true; 
      } 
      // also check for technology: tag.NFC_B/NFC_F/NFC_V/NDEF/MIFARE_CLASSIC/MIFARE_ULTRALIGHT/NDEF_FORMATABLE 
    } 
    // use NfcA APIs to access the found tag. 
    if (isNfcATag) { 
      let nfcA : tag.NfcATag | null = null; 
      try { 
        nfcA = tag.getNfcATag(tagInfo); 
      } catch (error) { 
        console.error("tag.getNfcATag catched error: " + error); 
      } 
      // other code to read or write this found tag. 
    } 
    // use getIsoDep APIs to access the found tag. 
    if (isIsoDepTag) { 
      let isoDep : tag.IsoDepTag | null = null; 
      try { 
        isoDep = tag.getIsoDep(tagInfo); 
      } catch (error) { 
        console.error("tag.getIsoDep catched error: " + error); 
      } 
      } 
  } 
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