『牛角书』鸿蒙简易备忘录
『牛角书』鸿蒙简易备忘录
- 前言
- 项目运行
-
- 功能介绍
- 项目截图
- 项目开发
-
- 项目创建
- 编写程序
前言
鸿蒙移动应用开发作为本学期的一门选修课，让我第一次了解了手机app的开发过程同时也清楚了鸿蒙应用的开发步骤，自己也试着开发了一个简单的鸿蒙app——备忘录。
项目运行
功能介绍
- 基本的备忘录功能
- 时间截止警告
- 搜索功能
项目截图
项目开发
项目创建
1、选择空项目
2、确认项目名称、存储路径、包名、开发SDK以及语言
3、完成创建
编写程序
1、前端index.html
{{ title }} {{ number }} {{$item.title}} DDL:{{$item.ddl}} {{$item.date}} edit.html
{{ddl_text}} {{ddl1_text}} {{ddl2_text}} {{ddl3_text}} 2、JS端携带的操作请求业务码以及业务数据，业务执行完后，返回响应给JS端。
package com.example.backup;import ohos.ace.ability.AceInternalAbility;import ohos.data.distributed.common.*;import ohos.data.distributed.user.SingleKvStore;import ohos.hiviewdfx.HiLog;import ohos.hiviewdfx.HiLogLabel;import ohos.rpc.MessageOption;import ohos.rpc.MessageParcel;import ohos.utils.zson.ZSONObject;import java.lang.reflect.Array;import java.util.*;public class TodoServiceAbility extends AceInternalAbility { // 常量 private static final String BUNDLE_NAME = "com.example.backup"; private static final String ABILITY_NAME = "com.example.backup.TodoServiceAbility"; public static final int SUCCESS = 0; public static final int ERROR = 1; public static final int SELECT_TODOS = 1001; public static final int DELETE_TODOS = 1002; public static final int UPDATE_TODOS = 1003; public static final int INSERT_TODOS = 1004; public static final int SELECT_TODO = 1005; // 定义日志标签 private static final HiLogLabel LABEL = new HiLogLabel(HiLog.LOG_APP, 0, "TodoDatabase"); // TodoServiceAbility 类的一个实例，所以从语义上他只能被初始化一次 private static TodoServiceAbility instance; // Context private MainAbility abilityContext; /** * 如果多个Ability实例都需要注册当前InternalAbility实例，需要更改构造函数，设定自己的bundleName和abilityName * 但是在这里我们的InternalAbility只会实例化一次 */ public TodoServiceAbility() { super(BUNDLE_NAME, ABILITY_NAME); } /** * 关键的接口，JS端携带的操作请求业务码以及业务数据，业务执行完后，返回响应给JS端。开发者需要继承RemoteObject类并重写该方法 * @param code Js端发送的业务请求编码 PA端定义需要与Js端业务请求码保持一致 * @param data Js端发送的MessageParcel对象，当前仅支持String格式 * @param reply 将本地业务响应返回给Js端的MessageParcel对象，当前仅支持String格式 * @param option 指示操作是同步还是异步的方式，但是我这里只有同步处理方式 * @return */ public boolean onRemoteRequest(int code, MessageParcel data, MessageParcel reply, MessageOption option) { SingleKvStore db = abilityContext.getSingleKvStore(); Map result = new HashMap(); Map ret = new HashMap(); HiLog.debug(LABEL, "onRemoteRequest"); // 基本思路-解析code-解析data-业务逻辑-构造reply switch (code) { case DELETE_TODOS: { String dataStr = data.readString(); TodoRequestParam param = new TodoRequestParam(); try { param = ZSONObject.stringToClass(dataStr, TodoRequestParam.class); } catch (RuntimeException e) { HiLog.error(LABEL, "convert failed."); } try { db.delete(param.id + " title"); } catch (KvStoreException k){ HiLog.debug(LABEL,"no"); }; try { db.delete(param.id + " text"); } catch (KvStoreException k){ HiLog.debug(LABEL,"no"); }; try { db.delete(param.id + " date"); } catch (KvStoreException k){ HiLog.debug(LABEL,"no"); }; try { db.delete(param.id + " ddl"); } catch (KvStoreException k){ HiLog.debug(LABEL,"no"); }; HiLog.debug(LABEL, "insert or update success"); break; } case UPDATE_TODOS: case INSERT_TODOS:{ String dataStr = data.readString(); TodoRequestParam param = new TodoRequestParam(); try { param = ZSONObject.stringToClass(dataStr, TodoRequestParam.class); } 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 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); elsecontinue; } 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"); }}3、系统主程序
package com.example.backup;import ohos.aafwk.ability.IAbilityContinuation;import ohos.ace.ability.AceAbility;import ohos.aafwk.content.Intent;import ohos.app.Context;import ohos.data.DatabaseHelper;import ohos.data.distributed.common.*;import ohos.data.distributed.device.DeviceFilterStrategy;import ohos.data.distributed.device.DeviceInfo;import ohos.data.distributed.user.SingleKvStore;import ohos.data.preferences.Preferences;import ohos.hiviewdfx.HiLog;import ohos.hiviewdfx.HiLogLabel;import java.util.ArrayList;import java.util.List;import java.util.Map;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 deviceInfoList = kvManager.getConnectedDevicesInfo(DeviceFilterStrategy.NO_FILTER); List 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 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); }}