ArkTS #02# Ability的调用及启动模式

1调用&单实例

import common from '@ohos.app.ability.common'
import Want from '@ohos.app.ability.Want'
@Entry
@Component
struct Index {
  @State message: string = 'Hello World'

  build() {
    Row() {
      Column() {
        Text(this.message)
          .fontSize(50)
          .fontWeight(FontWeight.Bold)

        Button('jump ab2 ').fontSize(55).onClick(() => {
          // 1 获取上下文
          let context = getContext(this) as common.UIAbilityContext

          // 2 封装want
          let want: Want = {
            deviceId: "",
            bundleName: "com.example.myapplication",
            moduleName: "entry",
            abilityName: "EntryAbility1",
          }

          // 3 调用上下文的start ab  启动 目标ab
          context.startAbility(want)
        })
      }
      .width('100%')
    }
    .height('100%')
  }
}

单实例是Ability的默认启动模式，因此，无需在module.json5中配置EntryAbility1

2多实例

      {
        "name": "EntryAbility1",
        "srcEntry": "./ets/entryability1/EntryAbility1.ts",
        "description": "$string:EntryAbility1_desc",
        "icon": "$media:icon",
        "label": "$string:EntryAbility1_label",
        "startWindowIcon": "$media:icon",
        "startWindowBackground": "$color:start_window_background",
        "launchType": "standard",
//        多实例启动方法 ， 可以 独立多开
      }

3指定实例

从index跳转，在Want中附带个体信息：

import common from '@ohos.app.ability.common'
import Want from '@ohos.app.ability.Want'
@Entry
@Component
struct Index {
  @State numbers: number[] = []
  index: number = 0

  build() {
    Row() {
      Column() {
        Row() {
          if (this.numbers.length <= 0) {
            Text('please add numbers !!!!!').fontSize(55)
          } else {
            ForEach(this.numbers, x => {
              Text(x.toString())
                .fontSize(55)
                .border({width: 1})
                .onClick(() => {
                  let context = getContext(this) as common.UIAbilityContext
                  let want: Want = {
                    deviceId: "",
                    bundleName: "com.example.myapplication",
                    moduleName: "entry",
                    abilityName: "EntryAbility1",
                    parameters: {
                      myKey: x.toString(),
                    },
                  }
                  context.startAbility(want)
                })
            })
          }
        }

        Button('add').fontSize(55).onClick(() => {
          this.index++
          this.numbers.push(this.index)
        })
      }
      .width('100%')
    }
    .height('100%')
  }
}

未知步骤：

import AbilityStage from '@ohos.app.ability.AbilityStage';
import Want from '@ohos.app.ability.Want';

export default class MyStage extends AbilityStage {
  onAcceptWant(want: Want) {
    if (want.abilityName === 'EntryAbility1') {
      return "" + want.parameters.myKey
    }
    return ""
  }
}

改module.json5：

{
  "module": {
    "name": "entry",
    "type": "entry",
    "description": "$string:module_desc",
    "mainElement": "EntryAbility",
    "srcEntry": "./ets/MyStage.ets",
    "deviceTypes": [
      "phone",
      "tablet"
    ],

改：

export default class EntryAbility1 extends UIAbility {
  onCreate(want, launchParam) {
    hilog.info(0x0000, 'testTag', '%{public}s', 'Ability onCreate');

    let myKey = want.parameters.myKey
    AppStorage.SetOrCreate("_myKey", myKey)
  }

接参数：

@Entry
@Component
struct PageDetail {
  myKey: string = AppStorage.Get("_myKey")

  build() {
    Column() {
      Text(this.myKey).fontSize(66).fontColor(Color.Red)
      Text("page detail here. ").fontSize(66).fontColor(Color.Red)
    }
  }
}