1# Ability Assistant 2 3 4The ability assistant enables you to start applications and test cases. It provides basic application debugging and testing capabilities, for example, starting application components, forcibly stopping processes, and printing application component information. 5 6> **NOTE** 7> 8> Before using this tool, you must obtain the [hdc tool](../../device-dev/subsystems/subsys-toolchain-hdc-guide.md) and run the hdc shell command. 9 10 11- help 12 13 Displays help information for the Ability Assistant. 14 15 **Return value** 16 17 Returns the help information. 18 19 **Method** 20 21 ```bash 22 aa help 23 ``` 24 25 26- start 27 28 Starts an application component. The target component can be the PageAbility and ServiceAbility components of the FA model or the UIAbility and ServiceExtensionAbility components of the Stage model. The **visible** tag in the configuration file of the target component cannot be set to **false**. 29 30 | Name| Description| 31 | -------- | -------- | 32 | -h/--help | Help information.| 33 | -d | Device ID. Optional.| 34 | -a | Ability name. Mandatory.| 35 | -b | Bundle name. Mandatory.| 36 | -D | Debugging mode. Optional.| 37 38 **Return value** 39 40 Returns "start ability successfully." if the ability is started; returns "error: failed to start ability." and the corresponding error information otherwise. 41 42 **Method** 43 44 ```bash 45 aa start [-d <deviceId>] -a <abilityName> -b <bundleName> [-D] 46 ``` 47 48- stop-service 49 50 Stops a ServiceAbility. 51 52 | Name| Description| 53 | -------- | -------- | 54 | -h/--help | Help information.| 55 | -d | Device ID. Optional.| 56 | -a | Ability name. Mandatory.| 57 | -b | Bundle name. Mandatory.| 58 59 **Return value** 60 61 Returns "stop service ability successfully." if the ServiceAbility is stopped; returns "error: failed to stop service ability." otherwise. 62 63 **Method** 64 65 ```bash 66 aa stop-service [-d <deviceId>] -a <abilityName> -b <bundleName> 67 ``` 68 69- dump 70 71 Prints information about an application component. 72 73 | Name| Level-2 Parameter| Description| 74 | -------- | -------- | -------- | 75 | -h/--help | - | Help information.| 76 | -a/--all | - | Application component information in all missions.| 77 | -l/--mission-list | type (All logs are printed if this parameter is left unspecified.)| For better management, the service side maintains four types of MissionLists, as described below:<br>- **NORMAL**: MissionList that is started normally. For example, if A starts B and C, the corresponding MissionList is A->B->C.<br>- **DEFAULT_STANDARD**: If a MissionList is damaged, missions with the launch type set to **standard** are removed to this MissionList. The Missions in it are not associated with each other.<br>- **DEFAULT_SINGLE**: If a MissionList is damaged, missions with the launch type set to **singleton** are removed to this MissionList. The Missions in it are not associated with each other.<br>- **LAUNCHER**: MissionList for launcher abilities. | 78 | -e/--extension | elementName | Extended component information.| 79 | -u/--userId | UserId | Mission stack information of a specified user ID. This parameter must be used together with other parameters. Example commands: **aa dump -a -u 100** and **aa dump -d -u 100**.| 80 | -d/--data | - | DataAbility information.| 81 | -i/--ability | AbilityRecord ID | Detailed information about an application component.| 82 | -c/--client | - | Detailed information about an application component. This parameter must be used together with other parameters. Example commands: **aa dump -a -c** and **aa dump -i 21 -c**.| 83 84 **Method** 85 86 ```bash 87 aa dump -a 88 ``` 89 90  91 92 93 ```bash 94 aa dump -l 95 ``` 96 97  98 99 100 ```bash 101 aa dump -i 12 102 ``` 103 104  105 106- force-stop 107 108 Forcibly stops a process based on the bundle name. 109 110 **Return value** 111 112 Returns "force stop process successfully." if the process is forcibly stopped; returns "error: failed to force stop process." otherwise. 113 114 **Method** 115 116 ```bash 117 aa force-stop <bundleName> 118 ``` 119
