Android Question Cannot clear canvas

[Mark Read]

I am using a modified version of the demo from steveIO5 to show the waveform of a playing mp3. I cannot get the canvas to clear, the waveform is always drawn on top of the old one. What am I doing wrong. Included is the full code without the mp3 file (added in line 37).
The code is for B4A 3.80 and using Media Player

I think it is probably something simple but its driving me crazy!

Thanks for any help

 

[Mark Read]

ok. How to destroy it. Just to see, I moved the "Viz.DrawWaveFormStart" into the Wave_Capture sub. No go! The wave does not scroll and the mp3 breaks apart!

 

[Mark Read]

That was not a good idea. Had to hard reset my tablet! oops.

 

[stevel05]

No, because the when thread that the wav draw routine runs it will be continually initialized.

 

[stevel05]

The two need to run totally separately.

 

[Mark Read]

Where can I put the Viz.DrawWaveFormStart so that the wave starts without a button or is that not possible?

 

[stevel05]

You can put it straight after the MP.Play call in Activity_Create

 

[stevel05]

I have to go out shortly, if you get any problems, post a message and I'll look at it when I get back, or in the morning.

 

[Mark Read]

Great, this is going to take some time to digest. Great work! I will try to include the WaveDraw class into my app AND get the gradient to work. If I get it to work, I will post it here to finish this thread.

Cheers.

 

[Mark Read]

Steve, its working! (Jumping for joy). The touch to end the app gives an error but the gradient works thanks to you. Now I just need a few more panels with different displays, FFT etc.

 

[stevel05]

Yes, Fft I've not looked at that. Hopefully someone will give us some direction there. Otherwise it's back to school I think.