The Android Sample App showcases the basic capabilities of device access and
control using the Home APIs for the device types it supports.

Once account authorization is complete and a structure has been selected, the
Sample App loads all local devices found in that
structure. If the device is in a room, it will be listed under that room.
The Sample App supports these device types:

- Color Temperature Light (on and off, brightness)
- Contact Sensor (boolean state)
- Dimmable Light (on and off, brightness)
- Extended Color Light (on and off, brightness)
- Generic Switch
- Google Camera
- Occupancy Sensor (occupancy sensing)
- On/Off Light (on and off, brightness)
- On/Off Light Switch
- On/Off Plug-in Unit (on and off)
- On/Off Sensor

<br />

## Actions on existing devices and automations

The Sample App consists of two tabs - **Devices** and **Automations**. Each tab
provides information about the structure and lets you perform tasks.

### Devices tab

The **Devices** tab (Figure 1) shows the rooms in the structure
(Backyard, Attic, Travel) and the devices for each room, along with the status
of each device. To view or edit the traits on a device, tap
the device name. This takes you to the control screen for that device
(Figure 2).

To add a device to the structure, tap **Add Device** from the **Devices**
tab (Figure 1), then follow the instructions to add a device
with or without using a QR code.  
![Devices tab of the Home APIs Sample App.](https://developers.home.google.com/static/apis/images/sample-app-auth-flow-structure-and-devices.png) *Figure 1*: Sample app screen: Devices tab view ![Device controls of the Home APIs Sample App.](https://developers.home.google.com/static/apis/images/sample-app-auth-flow-device-control-screen.png) *Figure 2*: Sample app device controls
| **Note:** The app subscribes to its devices and will automatically update whenever a device state changes, such as if the device is physically shut off or if the device state gets changed by another app.

### Automations tab

The **Automations** tab (Figure 3) shows a list of all automations for the
structure. Each automation shows its starters and actions. Multiple
starters and actions are supported.

Tap an automation to view its details, as shown in the example in Figure 4.
In this detailed view, you can delete the automation or manually execute the
automation without the need for a starter, provided that the
**Manually Execute** button is supported for this automation.

Also in the detailed view of an automation (Figure 4), you can toggle
**isActive** to turn the automation on or off.
The **isValid** field is set by the SDK and is `false` if there is an
issue with device or trait support or some other problem.  
![Automations tab of the Home APIs Sample App.](https://developers.home.google.com/static/apis/images/sample-app-automations-screen.png) *Figure 3*: Automations tab view ![Detailed view of a selected automation.](https://developers.home.google.com/static/apis/images/sample-app-automation-details-screen.png) *Figure 4*: Detailed view of one automation

## Create an automation

To create a new automation, tap the **Create** button from the automations list
view (Figure 3). The **New Automation** screen appears (Figure 5).

Use the **+Add Starter** and **+Add Action** buttons (Figure 5) to add one or
more starter and action to your automation. Figures 6 and 7 show examples
of selecting a starter and an action, respectively. After you have made your
selections, and you save the starter or action, you are then presented
with the **Update Starter** and **Remove Starter** buttons for the starter
(and **Update Action** and **Remove Action** for the action). This gives
you the opportunity to edit the starter or action, or remove it, before
you save the automation itself.

When you are done adding starters and actions, you can return to the
**New Automation** screen and tap **Create Automation** (Figure 8).  
![Sample app screen for starting a new automation.](https://developers.home.google.com/static/apis/images/sample-app-new-automations-first-screen.png) *Figure 5*: Start creating a new automation ![Sample app screen for adding a starter for an automation.](https://developers.home.google.com/static/apis/images/sample-app-automations-select-starter.png) *Figure 6*: Adding a starter to an automation  
![Sample app screen for adding an action for an automation.](https://developers.home.google.com/static/apis/images/sample-app-automations-select-action.png) *Figure 7*: Adding an action to an automation ![Sample app screen for creating an automation.](https://developers.home.google.com/static/apis/images/sample-app-create-automation-screen.png) *Figure 8*: Create the automation

## Troubleshooting

The app displays dialog messages for some common events that may occur.
Refer to the `adb` logs for information about how to resolve
these events.

If you encounter issues using the Sample App, see
[Troubleshooting for Android](https://developers.home.google.com/apis/android/troubleshooting).