Wear OS Tiles and Media Service-CodePudding

The Wear OS tiles example is great, not so much of an issue but how would one start the background media service that play the songs selected in the primary app, when every I try to start the service , I get the following error. The is no UI thread to reference and the documentation only has to methods for onclick, LoadAction and LaunchAction.

override fun onTileRequest(request: TileRequest) = serviceScope.future {
when(request.state!!.lastClickableId){
"play"-> playClicked()
}....

suspend fun playClicked(){

    try {
        // Convert the asynchronous callback to a suspending coroutine
        suspendCancellableCoroutine<Unit> { cont ->
            mMediaBrowserCompat = MediaBrowserCompat(
                applicationContext, ComponentName(applicationContext, MusicService::class.java),
                mMediaBrowserCompatConnectionCallback, null
            )
            mMediaBrowserCompat!!.connect()

        }
    }catch (e:Exception){
        e.printStackTrace()
    } finally {
      mMediaBrowserCompat!!.disconnect()
    }
}

ERROR

java.lang.RuntimeException: Can't create handler inside thread Thread[DefaultDispatcher-worker-1,5,main] that has not called Looper.prepare()

CodePudding user response：

serviceScope is running on Dispatchers.IO, you should use withContext(Dispatchers.Main) when making any calls to MediaBrowserCompat.

CodePudding user response：

Thanks Yuri, that worked. Here is how the function looks for anyone trying to implement this

suspend fun playClicked() = withContext(Dispatchers.Main){


        try {
            // Convert the asynchronous callback to a suspending coroutine
            suspendCoroutine<Unit> { cont ->
                mMediaBrowserCompat = MediaBrowserCompat(
                    applicationContext, ComponentName(applicationContext, MusicaPlayerService::class.java),
                    mMediaBrowserCompatConnectionCallback, null
                )
                mMediaBrowserCompat!!.connect()

            }
        }catch (e:Exception){
            e.printStackTrace()
        } finally {
          mMediaBrowserCompat!!.disconnect()
        }
    }```