Android Question SendKeyCode Issue

cooperlegend · Dec 17, 2019

I have a strange issue when using SendKeyCode to Pause and Play Spotify.

My code

B4X:

Si.SendKeyCode(KeyCodes.KEYCODE_MEDIA_PLAY_PAUSE)

This works but ONLY when in debug mode and I pause on this line of code using the debugger and then continue.

If I run this line of code normally it does not work for me.

Any ideas before I pull out the last few hairs from my head?

agraham · Dec 17, 2019

Try a Sleep(0) after the line to let the message loop run.

cooperlegend · Dec 17, 2019

agraham said:
Try a Sleep(0) after the line to let the message loop run.

Yep, I tried sleep(0) before and after , this made no difference

cooperlegend · Dec 17, 2019

It is almost as if the App needs focus for the call to work, very strange.

It works fine from a button (as in the demo code) but I need this to pause and play automatically whilst another announcement is made.

here is more of my code

B4X:

Sub PlaySpotify
    Dim SpotIsPlaying1 As Boolean     'ditto
    Dim R As Reflector

    R.Target = R.GetContext
    R.Target = R.RunMethod2("getSystemService","audio","java.lang.String")
    SpotIsPlaying1 = R.RunMethod("isMusicActive")
    Log("Start Spotify : playing=" & SpotIsPlaying1)

    If SpotIsPlaying1 == True Then Return
    
    If bSpotify Then
        Si.SendKeyCode(KeyCodes.KEYCODE_MEDIA_PLAY_PAUSE)
        Sleep(0)
    End If
End Sub

Sub StopSpotify
    Dim SpotIsPlaying1 As Boolean     'ditto
    Dim R As Reflector

    R.Target = R.GetContext
    R.Target = R.RunMethod2("getSystemService","audio","java.lang.String")
    SpotIsPlaying1 = R.RunMethod("isMusicActive")
    Log("Stop Spotify : playing=" & SpotIsPlaying1)

    If SpotIsPlaying1 == False Then Return
    
    If bSpotify Then
        Si.SendKeyCode(KeyCodes.KEYCODE_MEDIA_STOP)
        Sleep(0)
    End If
End Sub

Sub RunSpotify
    Dim i As Intent

    i.Initialize(i.ACTION_VIEW, "spotify:track:0")
    i.SetComponent("com.spotify.mobile.android.ui")

    StartActivity(i)
End Sub

agraham · Dec 18, 2019

cooperlegend said:
It is almost as if the App needs focus for the call to work,

Quite likely. Keystrokes are probably sent as a message through the message loop which the app doesn't/can't pump until it is in the foreground.

Android Question SendKeyCode Issue

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