基于JS和Java依托harmonyOS提供的能力完成的一个DDL管理器

    compileOptions {
        annotationEnabled true
    }

TodoServiceAbility.register(this);
      
        KvManagerConfig config = new KvManagerConfig(context);
        kvManager = KvManagerFactory.getInstance().createKvManager(config);

        Options CREATE = new Options();
        CREATE.setCreateIfMissing(true).setEncrypt(false).setKvStoreType(KvStoreType.SINGLE_VERSION);
        singleKvStore = kvManager.getKvStore(CREATE, storeID);

        KvStoreObserver kvStoreObserverClient = new KvStoreObserverClient();
        singleKvStore.subscribe(SubscribeType.SUBSCRIBE_TYPE_ALL, kvStoreObserverClient);

ClickToEdit(x) {
        console.info("ClickToEdit(" + x.toString() + ")");
        router.push({
            uri: 'pages/edit/edit', 
            params: {
                index: this.todoList[x].index,
                content: this.todoList[x]

<div class="container">
    <div class="title-box">
        <text class="title" onclick="onShow"> {{ title }}</text>
        <text class="number"> {{ number }} </text>
    </div>

    <div class="search-box">
        <search onchange="getTodos()" onblur="getTodos()">
        </search>
    </div>

    <div class="text-box">
        <list>
            <list-item for="{{todoList}}" class="todo-item" onlongpress="LongPressToChoose" onclick="ClickToEdit($idx)">
                <div style="width: 10px;">
                    <button if="{{$item.color==3}}" style="height: 100%; width: 100%; background-color: red;"></button>
                    <button if="{{$item.color==2}}" style="height: 100%; width: 100%; background-color: indianred;"></button>
                    <button if="{{$item.color==1}}" style="height: 100%; width: 100%; background-color: blue;"></button>
                    <button if="{{$item.color==0}}" style="height: 100%; width: 100%; background-color: skyblue;"></button>
                </div>
                <div class="div-item">
                    <text class="title-text" > {{$item.title}} </text>

                    <text if="{{$item.ddl}}" class="date-text" > DDL:{{$item.ddl}} </text>
                    <text else class="date-text"> {{$item.date}} </text>

                    <div class="delete-choose">
                        <input type="checkbox" value="{{$idx}}" disabled="{{!choose_delete}}" show="{{choose_delete}}" onchange="ChooseToDelete($idx)">
                        </input>
                    </div>
                </div>

            </list-item>
        </list>
    </div>

    <button class="addButton" type="circle" onclick="AddOrDelete">
        {{add_delete}}
    </button>
</div>

<div class="container">
    <div class="nav-bar">
        <button style="right: 0px;" onclick="ClickToBack"> {{ BACK }} </button>
        <button style="left: 0px;" onclick="InsertTodos"> {{ SAVE }}</button>
    </div>

    <div class="content">
        <textarea class="title" onchange="PassTitle">
            {{title}}
        </textarea>

        <textarea class="text" onchange="PassText">
            {{text}}
        </textarea>
    </div>

    <button class="addButton" type="circle" onclick="AddDdl">
        +
    </button>

    <dialog id="ddl_dialog" class="dialog-main">
        <div class="dialog-div">
            <div class="inner-txt">
                <text class="txt">{{ddl_text}}</text>
                <picker type="date" value="{{ddl}}" onchange="PassDdl"> </picker>
            </div>
            <div class="inner-txt">
                <text class="txt" >{{ddl1_text}}</text>
                <slider class="slide" value="{{ddls[0]}}" onchange="PassDdls(0)"></slider>
            </div>
            <div class="inner-txt">
                <text class="txt">{{ddl2_text}}</text>
                <slider class="slide" value="{{ddls[1]}}" onchange="PassDdls(1)"></slider>
            </div>
            <div class="inner-txt">
                <text class="txt">{{ddl3_text}}</text>
                <slider class="slide" value="{{ddls[2]}}" onchange="PassDdls(2)"></slider>
            </div>
            <div class="inner-btn">
                <button type="capsule" value="{{ CANCEL }}" onclick="CancelDdl" class="btn-txt"></button>
                <button type="capsule" value="{{ CONFIRM }}" onclick="SaveDdl" class="btn-txt"></button>
            </div>
        </div>
    </dialog>
</div>

                } catch (RuntimeException e) {
                    HiLog.error(LABEL, "convert failed.");
                }
                if (param.title!=null) db.putString(param.id+" title",param.title);
                if (param.date!=null) db.putString(param.id+" date",param.date);
                if (param.text!=null) db.putString(param.id+" text",param.text);
                if (param.ddl!=null) db.putString(param.id+" ddl",param.ddl);
                HiLog.debug(LABEL, "insert or update success");
                break;
            }
            case SELECT_TODOS:{
                // 返回结果当前仅支持String，对于复杂结构可以序列化为ZSON字符串上报
                HiLog.debug(LABEL, "Database Return All Result");
                String condition = data.readString();
                HiLog.debug(LABEL, "condition="+condition);
                Set<String> indexes = new HashSet<>();
                for (Entry i: db.getEntries("")){
                    indexes.add(i.getKey().split(" ")[0]);
                }

                for (String i: indexes){
                    String title,date,ddl;
                    try {
                        title = db.getString(i+" title");
                        if (title.contains(condition))
                            result.put("title",title);
                        else
                            continue;
                    }
                    catch (KvStoreException k){
                        title = "";
                    };
                    try {
                        date = db.getString(i+" date");
                        result.put("date",date);
                    }
                    catch (KvStoreException k){
                        date = "";
                    };
                    try {
                        ddl = db.getString(i+" ddl");
                        result.put("ddl",ddl);
                    }
                    catch (KvStoreException k){
                        ddl = "";
                    };
//                    HiLog.debug(LABEL, String.valueOf(result));
                    String rString = ZSONObject.toZSONString(result);
                    ret.put(i,rString);
                }
                reply.writeString(ZSONObject.toZSONString(ret));
                HiLog.debug(LABEL, "select all success");
                break;
            }
            case SELECT_TODO: {
                String dataStr = data.readString();
                TodoRequestParam param = new TodoRequestParam();
                try {
                    param = ZSONObject.stringToClass(dataStr, TodoRequestParam.class);
                } catch (RuntimeException e) {
                    HiLog.error(LABEL, "convert failed.");
                }
                String r;
                try {
                    r = db.getString(param.id+" text");
                } catch (KvStoreException k) {
                    r = "";
                }
                reply.writeString(r);
                HiLog.debug(LABEL, "select one text success");
                break;
            }
            default: {
                HiLog.debug(LABEL, "unknown code");
                return false;
            }
        };
        // 分布式数据库的同步
        abilityContext.syncContact();
        return true;
    }

    /**
     * Internal ability 注册接口
     */
    public static void register(MainAbility abilityContext) {
        instance = new TodoServiceAbility();
        instance.onRegister(abilityContext);
    }

    private void onRegister(MainAbility abilityContext) {
        this.abilityContext = abilityContext;
        this.setInternalAbilityHandler(this::onRemoteRequest);
        HiLog.info(LABEL, "jgq TodoServiceAbility onRegister");
    }

    /**
     * Internal ability 注销接口。
     */
    public static void unregister() {
        instance.onUnregister();
    }

    private void onUnregister() {
        abilityContext = null;
        this.setInternalAbilityHandler(null);
        HiLog.info(LABEL, "jgq TodoServiceAbility onUnregister");
    }
}

public class MainAbility extends AceAbility implements IAbilityContinuation {
//    static public Preferences preferences;
    static public String storeID = "TodoDistributeDatabase";
    private SingleKvStore singleKvStore;
    private KvManager kvManager;
    private static final HiLogLabel LABEL = new HiLogLabel(HiLog.LOG_APP, 0, "MainAbility");

    @Override
    public void onStart(Intent intent) {
        super.onStart(intent);
        HiLog.info(LABEL,"jgq onStart");

        // 开发者显示声明需要使用的权限
        requestPermissionsFromUser(new String[]{"ohos.permission.DISTRIBUTED_DATASYNC"}, 0);
        Context context = this.getContext();
//        DatabaseHelper databaseHelper = new DatabaseHelper(context);
//        String filename = "todoDB";
//        preferences = databaseHelper.getPreferences(filename);

        // 需要注册
        TodoServiceAbility.register(this);
        // 分布式数据库,不知道是不是写在这里,注册
        KvManagerConfig config = new KvManagerConfig(context);
        kvManager = KvManagerFactory.getInstance().createKvManager(config);
        // 创建数据库
        Options CREATE = new Options();
        CREATE.setCreateIfMissing(true).setEncrypt(false).setKvStoreType(KvStoreType.SINGLE_VERSION);
        singleKvStore = kvManager.getKvStore(CREATE, storeID);
        // 订阅
        KvStoreObserver kvStoreObserverClient = new KvStoreObserverClient();
        singleKvStore.subscribe(SubscribeType.SUBSCRIBE_TYPE_ALL, kvStoreObserverClient);
    }

    public SingleKvStore getSingleKvStore() {
        return singleKvStore;
    }

    @Override
    public void onStop() {
        // 取消注册
        HiLog.info(LABEL,"jgq onStop");
        TodoServiceAbility.unregister();
        super.onStop();
    }

    public void syncContact() {
        List<DeviceInfo> deviceInfoList = kvManager.getConnectedDevicesInfo(DeviceFilterStrategy.NO_FILTER);
        List<String> deviceIdList = new ArrayList<>();
        for (DeviceInfo deviceInfo : deviceInfoList) {
            deviceIdList.add(deviceInfo.getId());
        }

        if (deviceIdList.size() == 0) {
//            showTip("组网失败");
            HiLog.info(LABEL,"同步失败");
            return;
        }
        singleKvStore.registerSyncCallback(new SyncCallback() {
            @Override
            public void syncCompleted(Map<String, Integer> map) {
                getUITaskDispatcher().asyncDispatch(new Runnable() {
                    @Override
                    public void run() {
//                        queryContact();
//                        showTip("同步成功");
                        HiLog.info(LABEL,"同步成功");
                    }
                });
                singleKvStore.unRegisterSyncCallback();
            }
        });
        singleKvStore.sync(deviceIdList, SyncMode.PUSH_PULL);
    }
}