Back Button in Android

Android Processing

dlillard5

in Android Processing • 1 year ago

Can somebody please tell me what is wrong with this code?

When I include it in my sketch, it crashes the first time I run it, but only the first times. Also, when the back button is pressed, the sketch still exits. The menu button works fine though.

void keyReleased() {
if (key==CODED){
if(keyCode==MENU || keyCode==BACK){//MENU and BACK keys
//do things
}
}
keyCode=0;
}

Replies(9)

calsign

Re: Back Button in Android

1 year ago

MENU and BACK aren't good enough, because they are not built into Processing. You have to specify KeyEvent.KEYCODE_MENU and KeyEvent.KEYCODE_BACK.

dlillard5

I still have the same results... The "back" action isn't being overridden. The sketch is running on android 4.0, do you think that might have something to do with it? I don't know what else to try to keep the sketch from exiting

calsign

Re: Back Button in Android

1 year ago

Okay...
Try disabling USB Debug mode from Settings > Applications > Development on the device. Then run the application from the phone (Processing should automatically install it). If that doesn't work... Then it might not be possible to override it in the way that you intend.

Also... why do you want to keep the sketch from exiting? Is there some other way that the user will be able to exit?

dlillard5

Re: Back Button in Android

1 year ago

Thanks for the help but turning off USB Debug mode isn't working. What I'm trying to do is have the back and menu keys work to go in and out of a menu I have set up. Menu works, but back quits the sketch. Is there any other way to accomplish this?

calsign

Re: Back Button in Android

1 year ago

The best way (and the correct way) to accomplish that is to use activities; one for the main program, and one for the menu. Ideally, the menu would be written entirely with native GUIs... all of which would be stored in a separate XML file.
Currently, Processing does not support this and is not likely to ever support it.

I would suggest using the menu button again, or using a soft back button within the menu.

Another thing you could look at, in Settings > Applications > Development, is to see if Stop App via Long Press is enabled. You could try unchecking that...

dlillard5

Re: Back Button in Android

1 year ago

Do you mean Processing doesn't support activities, android GUIs, or both? Thanks, I'll probably just make a soft key for going back as well as the menu key again

calsign

Re: Back Button in Android

1 year ago

PApplet is single activity, so in order to have multiple activities, you would have to create the program in a greater IDE such as Eclipse. You could still use Processing's native methods and classes, but they would have to be part of a bigger, more complicated program.
I think you can still use the native Android GUIs through APWidgets.

dlillard5

Re: Back Button in Android

1 year ago

Okay thanks for the information!

David Wil..

Re: Back Button in Android

1 year ago

I use this:

public void onBackPressed() {
//do whatever you want here, or nothing
}
public void keyPressed() {
if (key == CODED) {
if (keyCode == KeyEvent.KEYCODE_BACK) {
keyCode = 1; // don't quit by default
}
}
}

Hope this helps,

Dave

Processing user on Google Plus? http://gplus.to/calx

Top Reply

Statistics

9 Replies
2505 Views
0 Followers

Actions

Permalink