Headset Requirements

来自： http://source.android.com/devices/accessories/headset/requirements.html

 

Headset Requirements

 

Media

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If a user connects a headset to the device while playing media, the audio output (sound) should be heard only via the headset.

For example, while playing media with the open source Universal Music Player, pressing the play/pause button should pause playback. Pressing the same button when media is paused should resume playback.

If the headset has volume control buttons:

• Pressing the volume-up button should increase the volume incrementally each time the button is pressed until maximum volume is reached. If the volume-up button is pressed and held, the volume should gradually increase to maximum volume setting.
• Pressing the volume-down button should decrease the volume incrementally each time the button is pressed until entirely muted. If the volume-down button is pressed and held, the volume should gradually decrease to silent.
• Pressing the volume-up button when in a muted state should increase the volume one notch at a time starting from silent.

Recommended for Apps: On disconnecting the headset, sound output should stop and playback should pause. On reconnecting, playback should not start again unless the user presses the play button. Upon pressing play, sound output should again be limited to the headset.

One button

Figure 1. Button functions for one-button headsets handling a media stream.

Two buttons

Figure 2. Button functions for two-button headsets handling a media stream.

Three buttons

Figure 3. Button functions for three-button headsets handling a media stream.

Four buttons

Figure 4. Button functions for four-button headsets handling a media stream.

Telephony

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If a user connects a headset to the device while a call is in progress, the conversation should continue on the headset. The call should not get disconnected, and the microphone should not be muted. If present, volume buttons should behave identically to media playback.

Pressing the play/pause button while a phone call is in progress should toggle the microphone state between muted and unmuted. If a user receives calls while using the headset, the voice assistance button should allow handling of those calls:

• While in a phone call, pressing quickly on the play/pause button should mute the microphone. And if pressed quickly again, the microphone should un-mute.
• While in a phone call, a long press on the play/pause button should end the telephone call.
• While receiving a phone call, pressing quickly on the play/pause button should accept the call.
• While receiving a phone call, a long press on the play/pause button should reject the call.

One button

Figure 5. Button functions for one-button headsets handling a phone call.

Two buttons

Figure 6. Button functions for two-button headsets handling a phone call.

Three buttons

Figure 7. Button functions for three-button headsets handling a phone call.

Four buttons

Figure 8. Button functions for four-button headsets handling a phone call.

Voice assistance

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The voice assistance button is a new inline control standard for consistently and conveniently accessing a voice search feature from any approved wearable audio device. By pressing the button defined here, users will hear the two-tone signature earcon indicating that the device is listening and ready to receive the query.

Whether embedded into a multi-function button or highlighted as a single button, it should always be quickly accessible, ergonomically correct, and placed intuitively as described in the following section.

Buttons and function mapping recommendations

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The following diagrams depict the acceptable configuration of the Android voice assistance button.

Options

Figure 9. Button configuration options.

Buttons should always be front facing and spaced out so they can be easily located by touch only.

Spacing

Buttons must be more than 5mm and must have at least 5mm distance between buttons. For four-button headsets, there must be at least 9mm of space between button D and the cluster of other buttons.

Figure 10. Button spacing requirements.

Icon

In the following diagram, A is unlabeled or labeled with a dot. B is labeled with a + or an arrow pointing up. C is labeled with a - or an arrow pointing down. D is labeled with the selected button icon.

Figure 11. Button icon requirements.

Sizing

The following diagram shows the ratio of button icon to the space around it.

Figure 12. Voice search button icon sizing requirements.

Microphone port

The microphone should never be obstructed when operating the buttons. Place the port away from finger interface area.

Figure 13. Microphone placement.