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So I can setup the key to launch Zello, but I was trying to set it up to start the Push To Talk on Zello. I tried within Zello, but it will only launch the settings to assign a task and/or other app without an option to use the button as a Push To Talk feature. If anyone has done it, let me know please!
Haven't done it, but MIGHT be able to do it with Button Remapper.
A while back the convenience key was made less convenient, and it stopped working in Zello.
I knocked up a crude app to "fix" it. It requires accessibility permissions to know when the key is pressed, then broadcasts the com.zello.ptt.down/up intent, so it doesn't need to be programmed as a PTT in Zello. It works better in a way, because you don't have to wake the device to use the key - you can use it with the display off still.
You're welcome to the source code to build it yourself in Android Studio, or I can upload the apk somewhere (but you might not trust it). If somebody else wants to make it configurable, for if/when they change the convenience key key code, that'd be good! But I don't know enough about writing android apps, so I didn't bother.