HarmonyOS Developer 开发指导

import data_preferences from '@ohos.data.preferences';

// 获取context
import featureAbility from '@ohos.ability.featureAbility'
let context = featureAbility.getContext();

let preferences = null;
let promise = data_preferences.getPreferences(context, 'mystore');

promise.then((pref) => {
    preferences = pref;
}).catch((err) => {
    console.info("Failed to get preferences.");
})

import UIAbility from '@ohos.app.ability.UIAbility';
let preferences = null;
export default class EntryAbility extends UIAbility {
    onWindowStageCreate(windowStage) {
        let promise = data_preferences.getPreferences(this.context, 'mystore');
         promise.then((pref) => {
             preferences = pref;
         }).catch((err) => {
             console.info("Failed to get preferences.");
         })
    }
}

let putPromise = preferences.put('startup', 'auto');
putPromise.then(() => {
    console.info("Succeeded in putting the value of 'startup'.");
}).catch((err) => {
    console.info("Failed to put the value of 'startup'. Cause: " + err);
})

let getPromise = preferences.get('startup', 'default');
getPromise.then((value) => {
    console.info("The value of 'startup' is " + value);
}).catch((err) => {
    console.info("Failed to get the value of 'startup'. Cause: " + err);
})

preferences.flush();

let observer = function (key) {
    console.info("The key" + key + " changed.");
}
preferences.on('change', observer);
// 数据产生变更，由'auto'变为'manual'
preferences.put('startup', 'manual', function (err) {
    if (err) {
        console.info("Failed to put the value of 'startup'. Cause: " + err);
        return;
    }
    console.info("Succeeded in putting the value of 'startup'.");
    preferences.flush(function (err) {
        if (err) {
            console.info("Failed to flush. Cause: " + err);
            return;
        }
        console.info("Succeeded in flushing."); // observer will be called.
    })
})

let proDelete = data_preferences.deletePreferences(context, 'mystore');
proDelete.then(() => {
    console.info("Succeeded in deleting.");
}).catch((err) => {
    console.info("Failed to delete. Cause: " + err);
})

import distributedObject from '@ohos.data.distributedDataObject';   

{
  "module": {
      "reqPermissions": [
          {
             "name": "ohos.permission.DISTRIBUTED_DATASYNC"
          }
      ]
  }
}

// FA模型
import featureAbility from '@ohos.ability.featureAbility';

function grantPermission() {
console.info('grantPermission');
let context = featureAbility.getContext();
context.requestPermissionsFromUser(['ohos.permission.DISTRIBUTED_DATASYNC'], 666).then((data) => {
    console.info('success: ${data}');
}).catch((error) => {
    console.error('failed: ${error}');
})
}

grantPermission();

// Stage模型
import UIAbility from '@ohos.app.ability.UIAbility';
let context = null;

class EntryAbility extends UIAbility {
  onWindowStageCreate(windowStage) {
    let context = this.context;
  }
}

function grantPermission() {
  let permissions = ['ohos.permission.DISTRIBUTED_DATASYNC'];
  context.requestPermissionsFromUser(permissions).then((data) => {
    console.info('success: ${data}');
  }).catch((error) => {
    console.log('failed: ${error}');
  });
}

grantPermission();

let localObject = distributedObject.createDistributedObject({
    name: undefined,
    age: undefined,
    isVis: true,
    parent: undefined,
    list: undefined
});
let sessionId = distributedObject.genSessionId();

// 发起方
let localObject = distributedObject.createDistributedObject({
    name: "jack",
    age: 18,
    isVis: true,
    parent: { mother: "jack mom", father: "jack Dad" },
    list: [{ mother: "jack mom" }, { father: "jack Dad" }]
});
localObject.setSessionId(sessionId);

// 被拉起方
let remoteObject = distributedObject.createDistributedObject({
    name: undefined,
    age: undefined,
    isVis: true,
    parent: undefined,
    list: undefined
});
// 收到status上线后remoteObject同步数据，即name变成jack,age是18
remoteObject.setSessionId(sessionId);

function changeCallback(sessionId, changeData) {
    console.info("change" + sessionId);

    if (changeData != null && changeData != undefined) {
        changeData.forEach(element => {
            console.info("changed !" + element + " " + localObject[element]);
        });
    }
} 

// 发起方要在changeCallback里刷新界面，则需要将正确的this绑定给changeCallback
localObject.on("change", this.changeCallback.bind(this));

localObject.name = "jack";
localObject.age = 19;
localObject.isVis = false;
localObject.parent = { mother: "jack mom", father: "jack Dad" };
localObject.list = [{ mother: "jack mom" }, { father: "jack Dad" }];

// 支持的修改方式
localObject.parent = { mother: "mom", father: "dad" };
// 不支持的修改方式
localObject.parent.mother = "mom";

console.info("name " + localObject["name"]); 

// 删除变更回调changeCallback
localObject.off("change", changeCallback);
// 删除所有的变更回调
localObject.off("change"); 

function statusCallback(sessionId, networkId, status) {
    this.response += "status changed " + sessionId + " " + status + " " + networkId;
}

localObject.on("status", this.statusCallback);

// 删除上下线回调statusCallback
localObject.off("status", this.statusCallback);
// 删除所有的上下线回调
localObject.off("status");

localObject.setSessionId("");