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| <title>USB 耳机：设备规范</title> |
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| <p>为了让 USB 耳机能够在 Android 生态系统中无缝工作，Android 设备必须为其提供一致的支持。本文档详细说明了在整个 Android 生态系统中支持 USB 耳机和适配器的 USB 行为。 |
| </p> |
| |
| <h2 id="software-mapping">软件映射</h2> |
| <p> |
| 兼容的 USB 耳机需要支持兼容的 HID 映射。以下键码映射需要设备支持。 |
| </p> |
| |
| <table> |
| <tbody><tr> |
| <th>函数</th> |
| <th>映射</th> |
| <th>环境</th> |
| <th>行为</th> |
| </tr> |
| <tr> |
| <td rowspan="6">A</td> |
| <td rowspan="6"><strong>HID 用途页</strong>：0x0C<br /> |
| <strong>HID 用途</strong>：0x0CD<br /> |
| <strong>内核按键</strong>：<code>KEY_PLAYPAUSE</code><br /> |
| <strong>Android 按键</strong>：<code>KEYCODE_MEDIA_PLAY_PAUSE</code></td> |
| <td rowspan="2">媒体播放</td> |
| <td><strong>输入</strong>：短按<br /> |
| <strong>输出</strong>：播放或暂停</td> |
| </tr> |
| <tr> |
| <td><strong>输入</strong>：长按<br /> |
| <strong>输出</strong>：启动语音指令<br /> |
| <strong>发送</strong>：<code>android.speech.action.VOICE_SEARCH_HANDS_FREE</code>（如果设备被锁定或其屏幕已关闭）。否则发送 <code>android.speech.RecognizerIntent.ACTION_WEB_SEARCH</code></td> |
| </tr> |
| <tr> |
| <td rowspan="2">来电</td> |
| <td><strong>输入</strong>：短按<br /> |
| <strong>输出</strong>：接听来电</td> |
| </tr> |
| <tr> |
| <td><strong>输入</strong>：长按<br /> |
| <strong>输出</strong>：拒绝来电</td> |
| </tr> |
| <tr> |
| <td rowspan="2">当前通话</td> |
| <td><strong>输入</strong>：短按<br /> |
| <strong>输出</strong>：结束通话</td> |
| </tr> |
| <tr> |
| <td><strong>输入</strong>：长按<br /> |
| <strong>输出</strong>：将麦克风设为静音或取消静音</td> |
| </tr> |
| <tr> |
| <td>B</td> |
| <td><strong>HID 用途页</strong>：0x0C<br /> |
| <strong>HID 用途</strong>：0x0E9<br /> |
| <strong>内核按键</strong>：<code>KEY_VOLUMEUP</code><br /> |
| <strong>Android 按键</strong>：<code>VOLUME_UP</code></td> |
| <td>媒体播放、当前通话</td> |
| <td><strong>输入</strong>：短按或长按<br /> |
| <strong>输出</strong>：调高系统或耳机的音量</td> |
| </tr> |
| <tr> |
| <td>C</td> |
| <td><strong>HID 用途页</strong>：0x0C<br /> |
| <strong>HID 用途</strong>：0x0EA<br /> |
| <strong>内核按键</strong>：<code>KEY_VOLUMEDOWN</code><br /> |
| <strong>Android 按键</strong>：<code>VOLUME_DOWN</code></td> |
| <td>媒体播放、当前通话</td> |
| <td><strong>输入</strong>：短按或长按<br /> |
| <strong>输出</strong>：调低系统或耳机的音量</td> |
| </tr> |
| <tr> |
| <td>D</td> |
| <td><strong>HID 用途页</strong>：0x0C<br /> |
| <strong>HID 用途</strong>：0x0CF<br /> |
| <strong>内核按键</strong>：<code>KEY_VOICECOMMAND</code><br /> |
| <strong>Android 按键</strong>：<code>KEYCODE_VOICE_ASSIST</code></td> |
| <td>所有。可在任何情况下触发。</td> |
| <td><strong>输入</strong>：短按或长按<br /> |
| <strong>输出</strong>：启动语音指令</td> |
| </tr> |
| </tbody></table> |
| |
| <h2 id="mechanical">机械工程</h2> |
| <p> |
| 设备制造商还应参考 <a href="/devices/audio/usb.html">USB 数字音频</a>页面，以了解有关在 Android 设备上实现 USB 的更多信息。设备制造商还必须遵循 Android CDD 的 <a href="/compatibility/android-cdd.html#7_7_usb">USB 部分</a>中的要求。</p> |
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