Just for some kicks, I decided I would make myself a little music player. Problem is, I would like to stop the current song, if a new button is pressed. How would I go about doing this?
Sneaky4296 wrote ...
2012/3/13
Sound Help
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My own mp3 files. I have them within the sounds folder, so they can be called using GreenfootSound
Ok so GreenfootSound:
There's a pause method and there's also a stop method
EDIT: Sorry forgot to actually answer the question:
Make a button class (in which it has its image and everything)
and then put an if(Greenfoot.mousePressed(this)) check in the act() method - in that if statements body use the pause()/stop() methods.
How do I use the pause and stop methods? (Sorry. My programming teacher doesn't really do a whole lot in terms of the sound aspect.)
As long as you have a instance world GreenfootSound variable (in my case, called 'song') initialized to "", when a button is clicked, it can call a world method that recieves the String which contains the filename of the song, and the method can first check to see if 'song' is currently playing, and if so stop it, then set 'song' to the new GreenfootSound using the filename string, and start it.
When a song is playing, 'song' will contain the GreenfootSound reference to the playing song, and can be paused or stopped with 'song.pause();' or 'song.stop();'
Actually, you can get away without checking if a song is currently playing before stopping or pausing it, as stop() and pause() will not bomb if the song is already not playing.
Thanks dan. I'm trying to make the GreenfootSound variable be really flexible, in terms of being able to be referenced from the other classes, so is it possible to make the sound a string variable, where the string variable is the sound to be played?
Here's my code for the parent class:
public class Buttons extends Actor
{
public GreenfootSound Sound = new GreenfootSound(^^^I want the variable 'Song' here^^^);
String Song= "01 Lonely Boy.mp3";
/**
* Act - do whatever the Buttons wants to do. This method is called whenever
* the 'Act' or 'Run' button gets pressed in the environment.
*/
public void act()
{
// Add your action code here.
}
}
The string would have to be used to create a GreenfootSound object before playing it, so, in a sense, yes. But, the flexibility will already be there when you add this method into the world class
You can call this from the Button class with
where I used 'Jukebox' as the name of the sub-class of world
and 'filename' as the sting containing the filename of the song.
1 2 3 4 5 6 | public void setSong(String filename){ song.stop(); song = new GreenfootSound(filename); song.play();} |
1 | ((Jukebox) getWorld()).setSong(filename); |
A skeleton of your Buttons class should look like this
In the world, you would create a new button with
where x and y are actual values, or previously set integer variables.
You then add more buttons using the different filenames.
If the "01 " at the beginning of the filename is not actually part of the filename, then in line 15, in the Buttons class above, use 'setSong(filename.substring(3));' and 'song' in the world class will be set to 'Lonely Boy.mp3'.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 | import greenfoot.*;public class Buttons extends Actor{ String filename= ""; public Buttons(String filenm) { filename = filenm; // code to construct the image of the button } public void act() { if (Greenfoot.mouseClicked(this)) ((Jukebox) getWorld()).setSong(filename); } } |
1 | addObject(new Buttons("01 Lonely Boy.mp3"), x, y); |
Can you explain this more in depth to me? Like an example couple of classes? I'm just learning and I don't really understand it...
-Edit- I need to read what you just posted
Classes so far...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 | import greenfoot.*;public class Buttons extends Actor{ String filename= ""; public Buttons(String filenm) { filename = filenm; // code to construct the image of the button } public void act() { if (Greenfoot.mouseClicked(this)) ((Jukebox) getWorld()).setSong(filename); } } |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 | import greenfoot.*; // (World, Actor, GreenfootImage, Greenfoot and MouseInfo)/** * Write a description of class Button here. * * @author (your name) * @version (a version number or a date) */public class Button extends Actor{ /** * Act - do whatever the Button wants to do. This method is called whenever * the 'Act' or 'Run' button gets pressed in the environment. */ public void act() { ((Jukebox) getWorld()).setSong(filename); } } |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 | import greenfoot.*; // (World, Actor, GreenfootImage, Greenfoot and MouseInfo)/** * Write a description of class Jukebox here. * * @author (your name) * @version (a version number or a date) */public class Jukebox extends World{ String song= "01 Lonely Boy.mp3"; /** * Constructor for objects of class Jukebox. * */ public Jukebox() { // Create a new world with 600x400 cells with a cell size of 1x1 pixels. super(600, 400, 1); } public void setSong(String filename) { song.stop(); song = new GreenfootSound(filename); song.play(); }} |
What do I do from here to make it functional?
The first thing is this: you have two button(s) classes, where you only need one.
== Remove the one named "Button" (the one without the 's' at the end.
== Change line 11 in the Jukebox world class to 'GreenfootSound song = null;'
== Change line 23 in the Jubebox world (in setSong method) to 'if (song != null) song.stop();'
== Insert immediately after 'super(600, 400, 1);' the 'addObject(new Buttons(...);' lines (one for each song)
== Add the code to create the images of the buttons in the Buttons class constructor, maybe
for a very simple button. Place them in the world at the same x coordinate and 20 apart from each other vertically.
1 2 3 4 | GreenfootImage img = new GreenfootImage(150, 19);img.drawRect(1, 1, 148, 17);img.drawString(filename, 5, 15);setImage(img); |
It says it can't find method stop...
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