From d5e9acc522b8fe636ca099562a4dffda46d50402 Mon Sep 17 00:00:00 2001
From: wangdongdong <wangdongdong14@huawei.com>
Date: Wed, 23 Mar 2022 15:12:21 +0800
Subject: [PATCH] continuation develop guide

Signed-off-by: wangdongdong <wangdongdong14@huawei.com>
Change-Id: I8427b1a3df5220d939e7d1ed73255e126ee0726c
---
 zh-cn/application-dev/ability/Readme-CN.md    |   2 +-
 .../ability/figures/continuation-info.png     | Bin 0 -> 13672 bytes
 .../ability/stage-ability-continuation.md     | 248 +++++++++++-------
 3 files changed, 152 insertions(+), 98 deletions(-)
 create mode 100755 zh-cn/application-dev/ability/figures/continuation-info.png
 mode change 100644 => 100755 zh-cn/application-dev/ability/stage-ability-continuation.md

diff --git a/zh-cn/application-dev/ability/Readme-CN.md b/zh-cn/application-dev/ability/Readme-CN.md
index f3b879e4b9..f230413e2d 100644
--- a/zh-cn/application-dev/ability/Readme-CN.md
+++ b/zh-cn/application-dev/ability/Readme-CN.md
@@ -11,7 +11,7 @@
    - [Ability开发指导](stage-ability.md)
    - [ServiceExtensionAbility开发指导](stage-serviceextension.md)
    - [FormExtensionAbility开发指导](stage-formextension.md)
-   - [应用迁移开发指导](stage-ability-continuation.md)
+   - [跨端迁移开发指导](stage-ability-continuation.md)
    - [Call调用开发指导](stage-call.md)
  - 其他
    - [WantAgent使用指导](wantagent.md)
diff --git a/zh-cn/application-dev/ability/figures/continuation-info.png b/zh-cn/application-dev/ability/figures/continuation-info.png
new file mode 100755
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diff --git a/zh-cn/application-dev/ability/stage-ability-continuation.md b/zh-cn/application-dev/ability/stage-ability-continuation.md
old mode 100644
new mode 100755
index 1c391834f0..b7e67a1b33
--- a/zh-cn/application-dev/ability/stage-ability-continuation.md
+++ b/zh-cn/application-dev/ability/stage-ability-continuation.md
@@ -1,178 +1,232 @@
-# 应用迁移开发指导
+# 跨端迁移开发指导
 
 ## 场景介绍
 
-迁移的主要工作是实现将应用当前任务，包括页面部分数据、栈信息等，迁移到远端设备。迁移成功后，本端任务将被清除；若失败则不会，可允许再次迁移。
-
-  
+迁移的主要工作是实现将应用当前任务，包括页面控件状态变量、分布式对象等，迁移到远端设备。页面控件状态变量用于同步页面UI数据，分布式对象用于同步内存中的数据。
 
 ## 接口说明
 
-迁移提供的能力如下，具体的API详见接口文档
+迁移提供的能力如下，具体的API详见[接口文档](https://gitee.com/openharmony/docs/blob/master/zh-cn/application-dev/reference/apis/js-apis-application-ability.md)。
 
 **表1** 应用迁移API接口功能介绍
 
 |接口名 | 描述|
 |:------ | :------|
-| onContinue(wantParams : {[key: string]: any}) | 迁移发起端在该回调中保存迁移所需要的数据，同时返回是否同意迁移：true表示同意，false表示拒绝。 |
+| onContinue(wantParams : {[key: string]: any}): OnContinueResult | 迁移**发起端**在该回调中保存迁移所需要的数据，同时返回是否同意迁移：0表示同意，拒绝返回相应错误码。 |
+| onCreate(want: Want，param：LaunchParam): void | 迁移**目标端**在该回调中完成数据恢复，并触发页面恢复。 |
+| **enum** OnContinueResult | onContinue的返回值类型：AGREE表示同意；REJECT表示拒绝；MISMATCH表示版本不匹配 |
 
 
 
-## 开发步骤
+**图1** 迁移开发示意图
 
-### 迁移应用
+![continuation_dev](figures/continuation-info.png)
 
+## 开发步骤
 
+### 迁移应用
 
 1. 配置
 
    - 配置应用支持迁移
 
-   ​    在config.json中配置continuable字段：true表示支持迁移，false表示不支持，默认为false.
+     在module.json5中配置continuable字段：true表示支持迁移，false表示不支持，默认为false。配置为false的应用将被系统识别为无法迁移。
 
-   ```
+   ```javascript
    "continuable": true
    ```
 
-   ​    配置为false的应用将无法在任务中心进行迁移。
+   
 
    * 配置应用启动类型
 
-   ​    迁移当前只支持多实例应用，需要在在config.json中配置launchType字段为standard
+     迁移当前只支持多实例应用，需要在在module.json5中配置launchType字段为standard
 
-   ```
+   ```javascript
    "launchType": "standard"
    ```
+   
+   
 
+   * 申请分布式权限
+   
+     支持跨端迁移的应用需要在module.json5申请分布式权限 DISTRIBUTED_DATASYNC。
+   
+   ```javascript
+   "requestPermissions": [
+       {
+           "name": "ohos.permission.DISTRIBUTED_DATASYNC"
+       },
+   ```
+   
+   这个权限需要在应用首次启动的时候弹窗让用户授予，可以通过在ability的onWindowStageCreate中添加如下代码实现
+   
+   ```javascript
+   requestPermissions = async () => {
+       let permissions: Array<string> = [
+           "ohos.permission.DISTRIBUTED_DATASYNC"
+       ];
+       let needGrantPermission = false
+       let accessManger = accessControl.createAtManager()
+       Logger.info("app permission get bundle info")
+       let bundleInfo = await bundle.getApplicationInfo(BUNDLE_NAME, 0, 100)
+       Logger.info(`app permission query permission ${bundleInfo.accessTokenId.toString()}`)
+       for (const permission of permissions) {
+           Logger.info(`app permission query grant status ${permission}`)
+           try {
+               let grantStatus = await accessManger.verifyAccessToken(bundleInfo.accessTokenId, permission)
+               if (grantStatus === PERMISSION_REJECT) {
+                   needGrantPermission = true
+                   break;
+               }
+           } catch (err) {
+               Logger.error(`app permission query grant status error ${permission} ${JSON.stringify(err)}`)
+               needGrantPermission = true
+               break;
+           }
+       }
+       if (needGrantPermission) {
+           Logger.info("app permission needGrantPermission")
+           try {
+               await this.context.requestPermissionsFromUser(permissions)
+           } catch (err) {
+               Logger.error(`app permission ${JSON.stringify(err)}`)
+           }
+       } else {
+           Logger.info("app permission already granted")
+       }
+   }
+   ```
+   
    
 
-2. 实现onContinue接口 
+2. 实现onContinue接口
 
-   导入模块
+   onContinue接口在**发起端**被调用，主要用于在迁移发起时，通知开发者保存控件状态变量和内存中数据，准备迁移。当应用准备完成后，需要返回OnContinueResult.AGREE(0)表示同意迁移，否则返回相应的错误码拒绝迁移。如果不实现该接口，系统将默认为拒绝迁移。
 
-   ```
+   导入模块
+   
+   ```javascript
    import Ability from '@ohos.application.Ability';
+   import AbilityConstant from '@ohos.application.AbilityConstant';
    ```
-
-   - 要实现迁移，此接口必须实现并返回true，否则默认为拒绝迁移。
+   
+   - 要实现迁移，此接口必须实现并返回AGREE，否则默认为拒绝迁移。
 
 
    - 示例
 
    ```javascript
-       onContinue(wantParams : {[key: string]: any}) {
-           console.log("MainAbility onContinue")
-           return true;
-       }
+    onContinue(wantParam : {[key: string]: any}) {
+        Logger.info("onContinue using distributedObject")
+        // set user input data into want params
+        wantParam["input"] = AppStorage.Get<string>('ContinueInput');
+        Logger.info(`onContinue input = ${wantParam["input"]}`);
+        return AbilityConstant.OnContinueResult.AGREE
+    }
    ```
 
    
 
 3. 在onCreate接口中实现迁移逻辑
 
-   - 远端设备上，在onCreate中根据launchReason判断该次启动是否为迁移LaunchReason.CONTINUATION（3）
+   onCreate接口在迁移**目标端**被调用，在目标端ability被拉起时，通知开发者同步已保存的内存数据和控件状态，完成后触发页面的恢复。如果不实现该接口中迁移相关逻辑，ability将会作为普通的启动方式拉起，无法恢复页面。
 
+   - 远端设备上，在onCreate中根据launchReason判断该次启动是否为迁移LaunchReason.CONTINUATION
+   
    
    - 完成数据恢复后，开发者需要调用**restoreWindowStage**来触发页面恢复。
    
-
+   
    * 示例
    
    ```javascript
-       onCreate(want , launchParam) {
-           // Ability is creating, initialize resources for this ability
-           console.log("MainAbility onCreate", launchParam.launchReason);
-           if (launchParam.launchReason == LaunchReason.CONTINUATION) {
-               this.contentStorage = new ContenStorage();
+       onCreate(want, launchParam) {
+           Logger.info(`MainAbility onCreate ${AbilityConstant.LaunchReason.CONTINUATION}`)
+           globalThis.abilityWant = want;
+           if (launchParam.launchReason == AbilityConstant.LaunchReason.CONTINUATION) {
+               let input = want.parameters.input // get user data from want params
+               AppStorage.SetOrCreate<string>('ContinueInput', input)
+               Logger.info(`onCreate for continuation sessionId:  ${this.sessionId}`)
+   
+               this.contentStorage = new ContentStorage();
                this.context.restoreWindowStage(this.contentStorage);
            }
        }
-   
    ```
    
    
 
 ### 迁移数据
 
-1. 使用自定义数据
+1. 使用分布式对象
 
-   - wantParams中可以填写key-value形式自定义数据，key类型string，填充的数据将随want被传输到远端，用于携带一些简单、轻量的数据。
+   分布式数据对象提供了与本地变量类似的操作，实现两个设备的数据同步，当设备1的应用A的分布式数据对象增、删、改数据后，设备2的应用A也可以获取到对应的数据变化，同时还能监听数据变更以及对端数据对象的上下线。用法详见[分布式对象指导文档](https://gitee.com/openharmony/docs/blob/master/zh-cn/application-dev/database/database-distributedobject-guidelines.md)。
 
+   迁移场景中，分布式对象（distributedDataObject）主要用于将本机内存数据同步到目标设备。
 
-   ```javascript
-       onContinue(wantParams : {[key: string]: any}) {
-           console.log("Continue My Data")
-           wantParams["myData"] = "my1234567";
-           return true;
-       }
-   ```
-
-   - 同时在远端判断如果是迁移，可以从want.parameters中取出在发起端保存的自定义数据。
+   - 发起端在onContinue中，将待迁移的数据存入分布式对象中，然后设置好session id，并通过wantParams将session id传到远端设备。
 
-   ```javascript
-       onCreate(want , launchParam) {
-           if (launchParam.launchReason == LaunchReason.CONTINUATION) {
-               console.log("onCreate LaunchReason = CONTINUATION",want.parameters["myData"]); // my1234567
-               ...
-               this.context.restoreWindowStage(this.contentStorage);
-           }
+    ```javascript
+      import Ability from '@ohos.application.Ability';
+      import distributedObject from '@ohos.data.distributedDataObject';
+     
+      var g_object = distributedObject.createDistributedObject({name:undefined});
+     
+      export default class MainAbility extends Ability {
+          contentStorage : ContenStorage
+          sessionId : string;
+   
+       onContinue(wantParam : {[key: string]: any}) {
+           Logger.info("onContinue using distributedObject")
+           this.sessionId = distributedObject.genSessionId();
+           //set distributed data object session id
+           g_object.setSessionId(this.sessionId);
+           g_object.name = "Amy";
+           // set session id into want params
+           wantParam["session"] = this.sessionId;
+           return AbilityConstant.OnContinueResult.AGREE
        }
    
-   ```
+    ```
 
+   - 目标设备在onCreate中，取出发起端传过来的session id，建立分布式对象并关联该session id，这样就能实现分布式对象的同步。需要注意的是，在调用restoreWindowStage之前，迁移需要的分布式对象必须全部关联完，保证能够获取到正确的数据。
    
-
-2. 使用分布式对象
-
-   使用分布式对象可以传输更多的数据到远端设备，更多用法详见分布式对象接口文档。
-
-   - 发起端在onContinue中，将待迁移的数据存入分布式对象中，然后设置好session id，并通过wantParams将session id传到远端设备。
-
-
-   - 远端设备在onCreate中，取出发起端传过来的session id，建立分布式对象并关联该session id，这样就能实现分布式对象的同步。需要注意的是，在调用restoreWindowStage之前，迁移需要的分布式对象必须全部关联完，保证能够获取到正确的数据。
-
-
-   * 示例
-
    ```javascript
-   import Ability from '@ohos.application.Ability';
-   import distributedObject from '@ohos.data.distributedDataObject';
-   
-   var g_object = distributedObject.createDistributedObject({name:undefined});
-   
-   export default class MainAbility extends Ability {
-       contentStorage : ContenStorage
-       sessionId : string;
-       onCreate(want , launchParam) {
-           if (launchParam.launchReason == 3) {
-               this.sessionId = want.parameters["session"] // 取出session id
-   
-               function statusCallback(sessionId, networkid, status) {
-                   console.info("object status change sessionId: " + sessionId + " status: " + status +
-                   "g_object.name: " + g_object.name); // 回调中可以取到同步过来的分布式对象内容 name = Amy
-               }
-               g_object.on("status", statusCallback); // 注册分布式对象同步结果的监听
-   
-               g_object.setSessionId(this.sessionId); // 将本地分布式对象也关联发起端的session id
-   
-               this.contentStorage = new ContenStorage();
-               this.context.restoreWindowStage(this.contentStorage);
-           }
-       }
-   
-       onContinue(wantParams : {[key: string]: any}) {
-           console.log("using distributedObject")
-           this.sessionId = "654321";
-           g_object.setSessionId(this.sessionId); //1 设置分布式对象的session id
-           g_object.name = "Amy"; // 填入数据
-           wantParams["session"] = this.sessionId; // 将session id 通过want传到远端
-           return true;
-       }
+      import Ability from '@ohos.application.Ability';
+      import distributedObject from '@ohos.data.distributedDataObject';
+      
+      var g_object = distributedObject.createDistributedObject({name:undefined});
+      
+      export default class MainAbility extends Ability {
+          contentStorage : ContentStorage
+          sessionId : string;
+      
+          statusCallback(sessionId, networkid, status) {
+              Logger.info(`continuation object status change, sessionId: ${sessionId}, status: ${status}, g_object.name: ${g_object.name}`)
+          }
+          
+          onCreate(want, launchParam) {
+              Logger.info(`MainAbility onCreate ${AbilityConstant.LaunchReason.CONTINUATION}`)
+              if (launchParam.launchReason == AbilityConstant.LaunchReason.CONTINUATION) {
+                  // get distributed data object session id from want params
+                  this.sessionId = want.parameters.session
+                  Logger.info(`onCreate for continuation sessionId:  ${this.sessionId}`)
+   
+                  g_object.on("status", this.statusCallback);
+                  // set session id, so it will sync data from remote device
+                  g_object.setSessionId(this.sessionId);
+          
+                  this.contentStorage = new ContentStorage();
+                  this.context.restoreWindowStage(this.contentStorage);
+              }
+          }
+      }
    ```
-
+   
    
 
-
+以上完整的示例见sample
 
 
 
-- 
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