Getting the View reference for setOnTouchListener

Android Processing

thisisvic..

Getting the View reference for setOnTouchListener

in Android Processing • 1 year ago

Hello,

I'm working on a Processing library that responds to touch events on Android.

I've written a class that implements the OnTouchListener and with the onTouch abstract method implemented.

Now I need to set an object of this class to listen to touch events (using the View.setOnTouchListener). However, this method requires a View parameter, which I believe should be the PApplet being "touched". I wonder how can I get the reference of this View parameter that receives touches and will then start passing touch events to my class.

Or if there is another way to do that?

I guess once Processing for Android supports registerMethod("touchEvent", target) this won't be necessary.

Thanks.

Best,
Victor

Replies(6)

calsign

Re: Getting the View reference for setOnTouchListener

1 year ago

You should be able to use this.
Processing's PApplet extends some incarnation of View.

thisisvic..

Re: Getting the View reference for setOnTouchListener

1 year ago

Thanks. So I can simply write:

this.setOnTouchListener(<some_touchListener>);

?

Looks like Eclipse is still complaining. I also tried to cast the PApplet object into View and it can't be done. May be I'm missing something?

calsign

Re: Getting the View reference for setOnTouchListener

1 year ago

Hmm... Eclipse... make sure you're using Android's Processing core libraries, not the standard ones.

hudsonm40..

Re: Getting the View reference for setOnTouchListener

9 months ago

Hi "thisisvictor"

Can you help? I am trying (and have been for days now...!) to try and get an android callback working for MediaPlayer, to handle the reaching an end of file. I have just read your first post in this thread where you say you have managed this for implementing similar for onTouch, so is there any chance you could post how you did it ... just a cut version of your class that you have for onTouchListener?

I have tried everything I can think of, including the use of 'this' but this just throws errors about not being able to override an abstract method etc...

I can get basics like play, pause, stop, rewind etc to all work as these are just called methods, but I just can't figure how/where to create my own callback methods such as "onCompletion" in a Processing class. If I can see how you did it for onTouch, hopefully I can use a similar approach.

Hope you can help me?

Mark

thisisvic..

Re: Getting the View reference for setOnTouchListener

9 months ago

Hi Mark,

Well I was simply doing the standard implementation of an abstract class in Java, but I still couldn't manage to make the registering thing work. As I mentioned the this.setOnTouchListener doesn't work and it seems that there has been some ongoing work in making the "registerMethod("touchEvent", target)" in the Processing for Android.

I kind of left those and was trying a different way. I don't have access to my development computer now so I'm not really sure if this would work, but here is what I've been trying to do:

Each class you define in Processing can have its own event handlers of standard events like mouse clicks and key presses (see http://wiki.processing.org/w/Register_events). And for Android touches can still be ported to mouse events using "super.surfaceTouchEvent(<Motion Event object>)" (see http://www.akeric.com/blog/?p=1435).

I haven't actually tried this yet but this would be my best guess for now. From your question you seem to want to go further by having other listeners working... I'm pretty sure Processing on desktop would work using "custom event handlers", but my impression is that the Android version is a limited one so this might not work.

Good luck with your work and let me know if I could be of help further.

-victor

hudsonm40..

Re: Getting the View reference for setOnTouchListener

9 months ago

Hi Victor

Many thanks for your ideas. I have now managed to get a working audio player class that calls onCompletion as I was hoping for! Now that it works, it seems so simple. It has taken ages but I have learnt a lot today ... :)

For anyone else who wants to try using android MediaPlayer, h ere's the basic code I have now managed to arrive at:

import java.io.*;
import android.media.MediaPlayer;
import android.media.MediaPlayer.OnCompletionListener;
MusicPlayer musicPlayer ;
void setup() {
musicPlayer = new MusicPlayer("//sdcard//sampleTesting/mix.wav");
musicPlayer.play() ;
}
void draw() {
}
// class to implement OnCompletionListener and provide other funtionality (eventually)
public class MusicPlayer implements OnCompletionListener {
//Variables
String fileName;
MediaPlayer myPlayer;
//Constructor
MusicPlayer (String _fileName) {
fileName = _fileName ;
myPlayer = new MediaPlayer();
myPlayer.setOnCompletionListener(this);
try {
myPlayer.setDataSource(fileName);
myPlayer.setLooping(false);
myPlayer.prepare();
println("prepare successful... ");
}
catch (IOException e) {
println("prepare() failed");
e.printStackTrace();
}
}
//Methods
void play(){
myPlayer.start();
}
void onCompletion(MediaPlayer listener) {
println("Stopping....");
myPlayer.release();
}
} //end of class

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