如何用HMS Nearby Service給本身的APP開發一個名片交換功能?

  在工做和生活中,碰見新的同事或者合做夥伴,交換名片是一個常見的用戶需求,紙質名片常忘帶、易丟失,是客戶的一個痛點。所以,市場上出現了不少交換電子名片的APP和小程序。那麼,如何給本身的APP開發一個名片交換功能呢?java

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  咱們能夠接入華爲近距離通訊服務,經過近距離設備間消息訂閱(Nearby Message),快速實現一對一或一對多名片交換。下圖是功能演示:android

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  若是你對實現方式感興趣,能夠去Github去下載源代碼,你們能夠基於具體的應用場景優化。git

  Github demo下載地址:https://github.com/HMS-Core/hms-nearby-demo/tree/master/NearbyCardExchangegithub

開發具體步驟以下:json

1. 開發準備

  若是您已是華爲的開發者,能夠省略此步驟。若是您之前沒有集成華爲移動服務的經驗,那麼須要先配置AppGallery Connect,開通近距離通訊服務並集成HMS SDK。相關步驟請參考官方文檔小程序

2. 添加權限

  在使用Nearby Message以前,須要添加網絡權限、藍牙權限、位置權限。在工程的AndroidManifest.xml文件中添加以下權限:網絡

<uses-permission android:name="android.permission.INTERNET " />
 <uses-permission android:name="android.permission.BLUETOOTH" />
 <uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
 <!-- The location permission is also required in Android 6.0 or later. -->
 <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
 <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />

3. 代碼開發

3.1 動態權限申請

  檢查藍牙開關、位置開關是否打開、網絡是否可用,並對位置權限進行動態權限申請app

@Override
 public void onStart() {
     super.onStart();
     getActivity().getApplication().registerActivityLifecycleCallbacks(this);
     checkPermission();
 }

 @Override
 public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
     for (int i = 0; i < permissions.length; ++i) {
         if (grantResults[i] != 0) {
             showWarnDialog(Constants.LOCATION_ERROR);
         }
     }
 }

 private void checkPermission() {
     if (!BluetoothCheckUtil.isBlueEnabled()) {
         showWarnDialog(Constants.BLUETOOTH_ERROR);
         return;
     }

     if (!LocationCheckUtil.isLocationEnabled(this.getActivity())) {
         showWarnDialog(Constants.LOCATION_SWITCH_ERROR);
         return;
     }

     if (!NetCheckUtil.isNetworkAvailable(this.getActivity())) {
         showWarnDialog(Constants.NETWORK_ERROR);
         return;
     }

     String[] deniedPermission = PermissionUtil.getDeniedPermissions(this.getActivity(), new String[] {
             Manifest.permission.ACCESS_COARSE_LOCATION,
             Manifest.permission.ACCESS_FINE_LOCATION
     });
     if (deniedPermission.length > 0) {
         PermissionUtil.requestPermissions(this.getActivity(), deniedPermission, 10);
     }
 }

3.2 封裝名片發佈接口和名片訂閱接口

  訂閱到的名片消息(onFound),把名片添加到查找名片對話框中顯示;名片消息丟失時(onLost),從查找名片對話框中刪除該名片ide

private MessageHandler mMessageHandler = new MessageHandler() {
     @Override
     public void onFound(Message message) {
         CardInfo cardInfo = JsonUtils.json2Object(new String(message.getContent(), Charset.forName("UTF-8")),
                 CardInfo.class);
         if (cardInfo == null) {
             return;
         }

         mSearchCardDialogFragment.addCardInfo(cardInfo);
     }

     @Override
     public void onLost(Message message) {
         CardInfo cardInfo = JsonUtils.json2Object(new String(message.getContent(), Charset.forName("UTF-8")),
                 CardInfo.class);
         if (cardInfo == null) {
             return;
         }

         mSearchCardDialogFragment.removeCardInfo(cardInfo);
     }
 };

 private void publish(String namespace, String type, int ttlSeconds, OnCompleteListener<Void> listener) {
     Message message = new Message(JsonUtils.object2Json(mCardInfo).getBytes(Charset.forName("UTF-8")), type,
             namespace);
     Policy policy = new Policy.Builder().setTtlSeconds(ttlSeconds).build();
     PutOption option = new PutOption.Builder().setPolicy(policy).build();
     Nearby.getMessageEngine(getActivity()).put(message, option).addOnCompleteListener(listener);
 }

 private void subscribe(String namespace, String type, int ttlSeconds, OnCompleteListener<Void> listener,
                        GetCallback callback) {
     Policy policy = new Policy.Builder().setTtlSeconds(ttlSeconds).build();
     MessagePicker picker = new MessagePicker.Builder().includeNamespaceType(namespace, type).build();
     GetOption.Builder builder = new GetOption.Builder().setPolicy(policy).setPicker(picker);
     if (callback != null) {
         builder.setCallback(callback);
     }
     Nearby.getMessageEngine(getActivity()).get(mMessageHandler, builder.build()).addOnCompleteListener(listener);
 }

3.3 名片交換菜單處理

  面對面交換名片交換碼,發佈我的名片成功後,訂閱名片消息優化

private boolean onExchangeItemSelected() {
     PinCodeDialogFragment dialogFragment = new PinCodeDialogFragment(passwrod -> {
         MyCardFragment.this.publish(passwrod, passwrod, Policy.POLICY_TTL_SECONDS_MAX, result -> {
             if (!result.isSuccessful()) {
                 String str = "Exchange card fail, because publish my card fail. exception: "
                         + result.getException().getMessage();
                 Log.e(TAG, str);
                 Toast.makeText(getActivity(), str, Toast.LENGTH_LONG).show();
                 return;
             }
             MyCardFragment.this.subscribe(passwrod, passwrod, Policy.POLICY_TTL_SECONDS_INFINITE, ret -> {
                 if (!ret.isSuccessful()) {
                     MyCardFragment.this.unpublish(passwrod, passwrod, task -> {
                         String str = "Exchange card fail, because subscribe is fail, exception("
                                 + ret.getException().getMessage() + ")";
                         if (!task.isSuccessful()) {
                             str = str + " and unpublish fail, exception(" + task.getException().getMessage()
                                     + ")";
                         }

                         Log.e(TAG, str);
                         Toast.makeText(getActivity(), str, Toast.LENGTH_LONG).show();
                     });
                     return;
                 }
                 mSearchCardDialogFragment.setOnCloseListener(() -> {
                     MyCardFragment.this.unpublish(passwrod, passwrod, task -> {
                         if (!task.isSuccessful()) {
                             Toast.makeText(getActivity(), "Unpublish my card fail, exception: "
                                     + task.getException().getMessage(), Toast.LENGTH_LONG).show();
                         }
                     });
                     MyCardFragment.this.unsubscribe(task -> {
                         if (!task.isSuccessful()) {
                             Toast.makeText(getActivity(), "Unsubscribe fail, exception: "
                                     + task.getException().getMessage(), Toast.LENGTH_LONG).show();
                         }
                     });
                 });
                 mSearchCardDialogFragment.show(getParentFragmentManager(), "Search Card");
             }, null);
         });
     });
     dialogFragment.show(getParentFragmentManager(), "pin code");

     return true;
 }

3.4 收藏名片處理

  收藏名片時把名片加入收藏列表,名片取消收藏時把名片從參數列表中刪除,並把數據保存到本地存儲中。

@Override
 public void onFavorite(CardInfo cardInfo, boolean isFavorite) {
     if (isFavorite) {
         mFavoriteMap.put(cardInfo.getId(), cardInfo);
     } else {
         mFavoriteMap.remove(cardInfo.getId());
     }
     Set<String> set = new HashSet<>(mFavoriteMap.size());
     for (CardInfo card : mFavoriteMap.values()) {
         set.add(JsonUtils.object2Json(card));
     }
     SharedPreferences sharedPreferences = getContext().getSharedPreferences("data", Context.MODE_PRIVATE);
     sharedPreferences.edit().putStringSet(Constants.MY_FAVORITES_KEY, set).apply();
 }

4.結後語

  本次給你們演示的demo用到了華爲HMS Nearby service的近距離設備間消息訂閱功能。基於Nearby Message能力不單單能夠用來作面對面交換名片,還能夠幫助開發者實現不少有趣的功能,例如:

  1. 競技類手遊中的面對面組隊功能
  2. 棋牌類手遊中的面對面約局功能
  3. 近場AA收款功能
  4. 音樂曲目共享功能

更詳細的開發指南參考華爲開發者聯盟官網:https://developer.huawei.com/consumer/cn/doc/development/HMS-Guides/nearby-service-introduction


往期連接:教你如何開發一個完敗Miracast的投屏新功能
原文連接:https://developer.huawei.com/consumer/cn/forum/topicview?tid=0201276303118820181&fid=18原做者:趙照

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