How do you turn on device speakers for Android using adb shell

问题

Have not seen any commands regarding turning the Android device speakers on using "adb shell", curious if there is a way?

#call phone
adb shell am start -a android.intent.action.CALL -d tel:X-XXX-XXXX

# ******* put speaker on here *******

sleep X

#end call
adb shell input keyevent KEYCODE_ENDCALL

回答1:

To set Speakerphone on from adb shell use:

• in Android 4.4.4: adb shell service call audio 35 i32 1
• in Android 5.1.0: adb shell service call audio 36 i32 1
• in Android 6.0.1: adb shell service call audio 30 i32 1
• in Android 7.0+: adb shell service call audio 29 i32 1

Replace 1 with 0 to set it off.

来源：https://stackoverflow.com/questions/25924801/how-do-you-turn-on-device-speakers-for-android-using-adb-shell