This report details the technical implementation and usage of Android Debug Bridge (ADB) commands to simulate input events, specifically focusing on "Extended Keys." These are media or application-specific buttons (such as Play/Pause, Skip, Volume, or Camera buttons) often found on external peripherals (headsets, Bluetooth devices) or specialized hardware. Understanding how to simulate these inputs is critical for QA testing, automation scripting, and developing Android applications that respond to hardware media controls.
For granular control (like holding a game button), standard keyevents might be too fast. You can split the event into ACTION_DOWN (press start) and ACTION_UP (press release). adb app control extended key
Several third-party utilities have built their interfaces around this idea: Report: ADB App Control and Extended Keys Executive
# Play/Pause
adb shell input keyevent 85
The key has no expiration date and includes all current and future updates for the Extended version. Re-activation: ADB App Control: The Extended Key Guide Android
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| Key Name | Key Code | Function |
| :--- | :--- | :--- |
| KEYCODE_VOLUME_UP | 24 | Raise volume. |
| KEYCODE_VOLUME_DOWN | 25 | Lower volume. |
| KEYCODE_VOLUME_MUTE | 164 | Mute device. |
| KEYCODE_MEDIA_PLAY_PAUSE | 85 | Toggle Play/Pause. |
| KEYCODE_MEDIA_STOP | 86 | Stop playback. |
| KEYCODE_MEDIA_NEXT | 87 | Next track. |
| KEYCODE_MEDIA_PREVIOUS | 88 | Previous track. |
adb shell input keyevent KEYCODE_HEADSETHOOK
ADB App Control: The Extended Key Guide
Android Debug Bridge (ADB) is a powerful command-line tool that lets you communicate with an Android device. While most users are familiar with installing apps (adb install) or copying files (adb push), ADB also offers robust mechanisms for simulating user interactions.