harmony 鸿蒙WantAgent Development

2022-12-22
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WantAgent Development

When to Use

The WantAgent class encapsulates want information that specifies a particular action, which can be starting an ability or publishing a common event. You can either call wantAgent.trigger to trigger a WantAgent directly or add a WantAgent to a notification so that it will be triggered when users tap the notification.

Available APIs

API	Description
getWantAgentInfo(info: WantAgentInfo, callback: AsyncCallback<WantAgent>)	Creates a WantAgent object. This API uses an asynchronous callback to return the result.
getWantAgent(info: WantAgentInfo): Promise<WantAgent>	Creates a WantAgent object. This API uses a promise to return the result.
trigger(agent: WantAgent, triggerInfo: TriggerInfo, callback?: Callback<CompleteData>)	Triggers a WantAgent object.

How to Develop

Import the WantAgent module.

   import wantAgent from '@ohos.app.ability.wantAgent';

Create a WantAgentInfo object that will be used for starting an ability. For details about the data types and parameters of WantAgentInfo, see WantAgent.

   private wantAgentObj = null // Save the WantAgent object created. It will be used to complete the trigger operations.
   
   // wantAgentInfo
   var wantAgentInfo = {
       wants: [
           {
               deviceId: "",
               bundleName: "com.example.test",
               abilityName: "com.example.test.EntryAbility",
               action: "",
               entities: [],
               uri: "",
               parameters: {}
           }
       ],
       operationType: wantAgent.OperationType.START_ABILITY,
       requestCode: 0,
       wantAgentFlags:[wantAgent.WantAgentFlags.CONSTANT_FLAG]
   }

Create a WantAgentInfo object for publishing a common event.

   private wantAgentObj = null // Save the WantAgent object created. It will be used to complete the trigger operations.
   
   // wantAgentInfo
   var wantAgentInfo = {
       wants: [
           {
               action: "event_name", // Set the action name.
               parameters: {}
           }
       ],
       operationType: wantAgent.OperationType.SEND_COMMON_EVENT,
       requestCode: 0,
       wantAgentFlags:[wantAgent.WantAgentFlags.CONSTANT_FLAG]
   }

Create a WantAgent object and save the returned wantAgentObj for subsequent trigger operations.

   // Create a WantAgent object.
   wantAgent.getWantAgent(wantAgentInfo, (err, wantAgentObj) => {
       if (err.code) {
           console.error("[WantAgent]getWantAgent err=" + JSON.stringify(err))
       } else {
           console.log("[WantAgent]getWantAgent success")
           this.wantAgentObj = wantAgentObj
       }
   })

Trigger the WantAgent object.

   // Trigger the WantAgent object.
   var triggerInfo = {
       code:0
   }
   wantAgent.trigger(wantAgentObj, triggerInfo, (completeData) => {
       console.log("[WantAgent]getWantAgent success, completeData: ",  + JSON.stringify(completeData))
   })