ronald wrote...
If I have 3 songs, I click on the first button and the third progress bar works, I tell myself that there is a problem
ronald wrote ...
2021/2/19
Button Sound Array
In your code above (here), line 38 only ever references the last song assign it by line 57. So, line 110 only works on last bar created.
ronald wrote...
I tried to put this in an array
but line 110 indicates that a method is neededvalueBar[songIndex]....
I just tried and here is the error
java.lang.ArrayIndexOutOfBoundsException: Index 0 out of bounds for length 0
at Background.updateValueDisplay(Background.java:108)
at Background.<init>(Background.java:55)
at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:490)
at greenfoot.core.Simulation.newInstance(Simulation.java:580)
at greenfoot.platforms.ide.WorldHandlerDelegateIDE.lambda$instantiateNewWorld$0(WorldHandlerDelegateIDE.java:143)
at greenfoot.core.Simulation.runQueuedTasks(Simulation.java:470)
at greenfoot.core.Simulation.maybePause(Simulation.java:299)
at greenfoot.core.Simulation.runContent(Simulation.java:190)
at greenfoot.core.Simulation.run(Simulation.java:183)
valueBar[songIndex].setImage(img);
ronald wrote...
I just tried and here is the error
<< Error Trace Omitted >>public Background()
{
// Create a new world with 600x400 cells with a cell size of 1x1 pixels.
super(900, 600, 1);
GreenfootImage bg = getBackground();
for(int i = 0; i<buttons.length; i++)
{
buttons[i] = getNewButton("BUTTON 0"+(i+1));
addObject(buttons[i],500,i*50+100);
GreenfootImage img = new GreenfootImage(songs[i],30,Color.BLUE,TRANS);
bg.drawImage(img,50,85+i*50);
valueBar = new SimpleActor[i];
updateValueDisplay();
addObject(valueBar[i],750,i*50+100);
}
}
you mean line 16 of the constructor I just gave you
always the same error
line 16 is line 54
java.lang.NullPointerException
at Background.<init>(Background.java:54)
at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:490)
at greenfoot.core.Simulation.newInstance(Simulation.java:580)
at greenfoot.platforms.ide.WorldHandlerDelegateIDE.lambda$instantiateNewWorld$0(WorldHandlerDelegateIDE.java:143)
at greenfoot.core.Simulation.runQueuedTasks(Simulation.java:470)
at greenfoot.core.Simulation.maybePause(Simulation.java:299)
at greenfoot.core.Simulation.runContent(Simulation.java:190)
at greenfoot.core.Simulation.run(Simulation.java:183)
valueBar[i] = new SimpleActor();
Around line 38, you should have:
private Actor[] valueBar = new Actor[songs.length];
everything works very well
Thank you
for the percentage, I'll see another time,
as long as I understand your scenario Barriers And Bars Demos
I tried a little, I have the impression that we must copy all the code
Isn't there another way to do it?
thanks again for the help, danpost
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