HarmonyOS 如何在应用内跳转到系统短息编辑的功能，并且附带编辑内容及收信人号码

可以调用startAbility接口指定号码并跳转到发送短信页面，参考以下示例代码：

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

const MMS_BUNDLE_NAME = "com.ohos.mms";
const MMS_ABILITY_NAME = "com.ohos.mms.MainAbility";
const MMS_ENTITIES = 'entity.system.home';

export class Contact {
  contactsName: string;
  telephone: number;

  constructor(contactsName: string, telephone: number) {
    this.contactsName = contactsName;
    this.telephone = telephone;
  }
}

@Entry
@Component
struct JumpMessage {
  private context = getContext(this) as common.UIAbilityContext
  startMMSAbilityExplicit() {
    // 这里完善联系人和号码
    let params: Array<Object> = [new Contact("张三", 13344556677)];

    let want: Want = {
      bundleName: "com.ohos.mms",
      abilityName: "com.ohos.mms.MainAbility",
      parameters: {
        contactObjects: JSON.stringify(params),
        pageFlag: "conversation",
        // 这里填写短信内容
        content: "我才是测试内容"
      }
    };
    this.context.startAbilityForResult(want).then((data) => {
      console.log("Success" + JSON.stringify(data))
    }).catch(() => {
      console.log("error")
    })
  }

  build() {
    Row() {
      Column() {
        Button('发送短信')
          .onClick(() => {
            this.startMMSAbilityExplicit();
          })
      }
      .width('100%')
    }
    .height('100%')
  }
}