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一、开发环境

系统版本：OpenHarmony 4.0.10.13
设备平台：rk3588
SDK版本：fullSDK 4.0.10.13

二、背景

使用自研应用作为默认Launcher，或者说使特定应用默认开机自启作为Home应用。

三、分析过程

通过分析原生Launcher启动流程可知：
AMS启动根据应用优先级启动应用，通常是OOBE或Launcher
foundation/ability/ability_runtime/services/abilitymgr/src/ability_manager_service.cpp

void AbilityManagerService::StartUserApps(int32_t userId, bool isBoot)
{
HILOG_INFO("StartUserApps, userId:%{public}d, currentUserId:%{public}d", userId, GetUserId());
if (currentMissionListManager_ && currentMissionListManager_->IsStarted()) {
HILOG_INFO("missionListManager ResumeManager");
currentMissionListManager_->ResumeManager();
}
//启动优先级最高的应用
StartHighestPriorityAbility(userId, isBoot);
}...void AbilityManagerService::StartHighestPriorityAbility(int32_t userId, bool isBoot)
{.../* Query the highest priority ability or extension ability, and start it. usually, it is OOBE or launcher */Want want;want.AddEntity(HIGHEST_PRIORITY_ABILITY_ENTITY);AppExecFwk::AbilityInfo abilityInfo;AppExecFwk::ExtensionAbilityInfo extensionAbilityInfo;int attemptNums = 0;//ImplicitQueryInfoByPriority查询应用ability和extensionAbility配置中的优先级while (!IN_PROCESS_CALL(bms->ImplicitQueryInfoByPriority(want,AppExecFwk::AbilityInfoFlag::GET_ABILITY_INFO_DEFAULT, userId,abilityInfo, extensionAbilityInfo))) {HILOG_INFO("Waiting query highest priority ability info completed.");++attemptNums;if (!isBoot && attemptNums > SWITCH_ACCOUNT_TRY) {HILOG_ERROR("Query highest priority ability failed.");return;}AbilityRequest abilityRequest;ComponentRequest componentRequest = initComponentRequest();if (!IsComponentInterceptionStart(want, componentRequest, abilityRequest)) {return;}usleep(REPOLL_TIME_MICRO_SECONDS);}...//启动查询到的最高优先级应用/* note: OOBE APP need disable itself, otherwise, it will be started when restart system everytime */(void)StartAbility(abilityWant, userId, DEFAULT_INVAL_VALUE);
}

至此我们了解到应用优先级取决于应用ability和extensionAbility 优先级配置
查看官方资料
module.json5配置文件

查看launcher module.json5配置文件

"extensionAbilities": [{"priority": 2,  //优先级设定为2"skills": [  //接受home Want的特征标签{"entities": ["entity.system.home","flag.home.intent.from.system"],"actions": ["action.system.home","com.ohos.action.main","action.form.publish"]}],"exported": false,  //本组件不可被其他应用调研"name": "com.ohos.launcher.MainAbility