I am working on a flash game and about finished with it but I'm running into an issue. When the game ends, or the user presses the "End Game" button I want to return them to the main menu. The game is set up so that the main menu is on the 3rd frame, and the game runs in the 4th frame. All of the game code is there.
A few things I have tried:
I just simply tried to return to the 3rd frame. This results in the error:
TypeError: Error #1009: Cannot access a property or method of a null object reference.
at Hundred_fla::MainTimeline/GotoEndGame()[Hundred_fla.MainTimeline::frame5:66]
I have tried returning all the game vars to their default values, removing all children... so on... I also get the exact same error... not sure what the problem is. I thought one solution would be to reload the movie, but this will be running on Android/IOS and I cannot refresh a webpage. ... any help would be greatly appreciated. Thanks
Edit: The code on line 66 is:
while(stage.numChildren > 0){
stage.removeChildAt(stage.numChildren-1);
}
You should lock stage link before trying to purge it of objects. You are seemingly removing the instance that runs the code, so it loses stage reference.
var theStage:Stage=stage;
while(theStage.numChildren > 0){
theStage.removeChildAt(0);
//you can always be sure that element at [0] exists, rather than going for [numChildren-1]
}
Depending on what's line 66 of the 5th frame, it could a few things:
you are targeting Flash Player 9, where the display objects are loaded asynchronously to your gotoAndStop call, so you end up with null references. Solution is to target Flash Player 10 or 11 (change it in Publish Settings [Ctrl+Shift+F12]). If you really need to target Flash Player 9, there are convoluted methods to ensure the attributes are accessible
after the gotoAndStop you are referencing an object from the 5th frame, which is not available anymore, and thus throws a null object reference error
it's an error in your logic and we need to see some of the code to find it
When in doubt, it's always best to leave the gotoAndStop call as the last one in the method.
Edit:
After seeing the code, it seems that stage itself is null and thus throwing the error. If it makes no visible difference, you can surround your code with a try/catch:
try {
while(stage.numChildren){
stage.removeChildAt(0);
}
} catch (error:Error) {
}
Also try listening to the ADDED_TO_STAGE event to make sure you have a valid reference to stage before accessing it.
Related
So, I have this android application and even some users. As I have a crash report system, I can see when someone's app crashes and the cause.
It appears that, though rarely, the app crashes randomly with NullPointerException when it tries to change some attributes(rotation, text, etc..). I make sure everything is set first thing in the onViewCreated method(using Fragments) like this:
private TextView orientationView;
orientationView = this.getActivity().findViewById(R.id.orientationView);
Using this ^^ example, I then try to hide/show this view and get an exception as it appears to be null sometimes, which is what I struggle to figure out why.
orientationView.setVisibility(View.VISIBLE); // app crashes when orientationView is null
Being a newbie in android development, I am not sure if it is a good practice, but in some of the fragments, I set all the previously initialized resources to null in the onDestroyView method, but the one that crashes the most doesn't have this method implemented, which make me to believe that somehow the resources are just not found/initialized in some rare occasions and I fail to change them later with an exception.
Could someone help me figure this out :) (more description could be provided, if needed)
I'm repairing my friend's code and got confused.
My friend wants to fetch entered text (in EditText). Seems easy, right? Well, it is but instead of user input, he gets this warning/error:
To be honest I'm not sure how to fix it. He is coding in Kotlin (Android 10).
Activity that contains EditText:
And XML:
This is how it looks when debugging:
The app started working just fine after running "File -> invalidate Cashes/Restart" option, I just don't understand where this warning came from and how to fix it because the error remained unchanged (even though the app works). Do you have an idea how to solve it?
All the best!
fyi lambda expression like setOnClickListener from kotlin is not debuggable, see here.
if you want to debug variables inside setOnClickListener you should use the normal one e.g. setOnClickListener(object: View.OnClickListener {..})
sometimes there will be problem in auto generated binding files, if so it will be solved after invalidate cache and restart ide. sometimes the warning/error show but the project and complied without errors. so no need to worry about that. for next time post the code as code not screen shots.
I understand that the question is regarding evaluating expression, but there is a way you can read variables from your debugger console, even if you're inside an anonymous callback. I found it helpful sometimes. Here are the steps:
First enter debugger mode inside of your anonymous callback,
In your debugger console, look at the right side for "Frames"
Within Frames under , you'll see stack of function execution first top one on the list is the latest:
Click on row(s) below the latest function, until you find an instance of your activity AddInformationActivity. You will see the activity instance on the right side window under Variables. Don't go as far as selecting functions browned out, because those are from internal libraries.
When you see you AddInformationActivity instance, you can expand it and see its variables.
Hope that helps!
It's not a beautiful way, but if you create a method like this:
private fun debug() {
println()
}
and add a breakpoint on the println() it'll capture the activity.
(Don't use TODO as it'll crash the app with a NotImplementedError once called.)
I have this method now in my code all the time to call it whenever I need it.
I know, that question is old, but I just stumbled over it and needed a way.
My scientific app is fully dynamic and there is only one activity, no fragment or intent.
In some situations, I need to finish the app completely.
So I run
(this as Activity).finishAndRemoveTask()
It works smoothly since Lollipop (Android 5.0), version 21.
Apparently, no app traces or services remains in the memory.
However, I've found a huge problem.
I have some global array or array list (I didn't see other variables).
that remains intact with a new rerun, even a I have a declaration
that empties that variables. It doesn't happen with a rerun via debugger,
should be a new rerun from cell phone.
Below I show a schematic example. I declare in one .kt file, outside any class or function.
class DispFu(
var id: Int = 0,
var isKeyl:Boolean=false,
}
var vDispFu = arrayListOf<DispFu>()
After, I populate vDispFu inside onCreate processing and reach 134 items.
To prove it, I've recorded a file on my phone inside my activity onCreate processing, before exit the program.
fun now():String{
var hora = LocalTime.now()
return "${hora.hour}:${hora.minute}:${hora.second}"
}
var fileDep:File = createOrGetFile(Environment.getExternalStoragePublicDirectory
(Environment.DIRECTORY_DOWNLOADS),"DepCalc","") // File for debugging
fileDep.appendText("${now()} -> vDispFu size is ${vDispFu.size}\n")
Below there are 2 runs: the first run (inside debugger) and a independent rerun. Here is the file content:
11:3:2 -> vDispFu size is 0
11:3:18 -> vDispFu size is 134
I know that global variables are not recommended, but I just wanted to understand what is going on. It doesn't make sense to me.
If someone could give me some clue about what is happening and give me some alternative strategy, it would be great!
Obviously, for practical reasons, the solution could not involve completely reformulating the program, which has almost 40 thousand lines...
Finishing an Activity doesn't shut down your entire Application or VM, so all global variables continue to stay in memory. When you rerun your application with the debugger, it actually restarts the VM, which is why you're seeing it get cleared in that case.
System.exit() is not an ideal solution since it restarts your VM process. There will be extra churn to do that. It's really intended for abnormal unrecoverable errors. Not necessarily a problem in your particular case.
The more proper way to handle this would be to put your top-level data in a singleton and clear it manually when you are finishing the Activity.
I've solved my problem:
Sometimes, it is incredible how the effort to externalize a problem sometimes helps to solve it ....
The below procedure to quit completely an app:
(this as Activity).finishAndRemoveTask()
It's not enough, despite all the posts about it on Stack Overflow that advocate this strategy.
It's necessary includes other command:
(this as Activity).finishAndRemoveTask()
System.exit(0)
Now:
11:26:25 -> vDispFu size is 0
11:27:1 -> vDispFu size is 0
I am trying to incorporate Android GraphView project into my app and all the time I have some strange problem with it.
My app requires drawing graph from real time data. I have thread with all the communication that is providing the data. In main thread I am reading this data and simply use mSeries1.appendData(new DataPoint(counter,data[0]),true,100); where counter is int that is incremented after each update.
Unfortunately at some point it freeze. I've tried putting it in synchronized block or changing the line of code to mSeries1.appendData(new DataPoint(counter,counter),true,100); and still this same result.
This is how the memory looks like during app running and when it freezes:
Does anyone have any idea what might be wrong in here?
EDIT:
This is my current method for updating my graph view:
public void onEventMainThread(ReadingsUpdateData data) {
mSeries1.appendData(new DataPoint(counter,data.getData()[0]),true,100);
counter++;
}
Maybe it's too late, but I had the similar problem and finally I found that when GraphView is appended a new data of "NaN" freezes.
So check the situation in which the result will be NaN such as divide by zero or something like that.
Although you do not specify the rate at which you add points, and how long for the app runs without crashing, you should expect things to go wrong at some point (you're potentially generating an infinite number of point objects, while the memory is indeed limited).
Do you need to have all the points the app has received from the beginning drawn ? If not, you could implement a sort of circular buffer that only keeps the X last values generated by your "provider thread", and update the graph each time you receive a new value with the method
your_series.resetData( dataPoint[] my_circular_buffer_of_data_points );
This thread is quite similar to your problem, have a look at it !
I am developing a game in Android using AndEngine GLES-2. I am facing a problem while resetting a scene after player has completed a level. When I reset the scene, all the sprites lose their positions and tend to appear in each other's positions i.e. they swap their positions.
I have tried all the things like setting all the sprites etc. to null and calling methods like clearUpdateHandlers() and clearEventModifiers() etc. but no success yet.
I found out after a lot of googling that engineOptions.getRenderOptions().disableExtensionVertexBufferObjects(); method can fix this problem. So I am trying to invoke it but compiler gives error saying that this method in not defined for RenderOptions class.
I checked the RenderOptions class in org.andengine.engine.options package and the method really does not exist in that class. Am I missing any plug-in or is there any other problem? Please help, I am stuck.
you need to manually restart the scene, for example:
To restart a Scene you can Finish the activity and Start again but different level with SharedPreferences, or Tag's in intents, or you can set position of each Sprite and cler the Scene with:
//detachChild this Sprites that you do not use
Scene.detachChild(SpriteX);
//clear the space of memory of each sprite that you do not use
SpriteX.dispose();
//unload the bitmaps that you do not use
BitMapsX.unload();
this method have a seconds to run, but you can use a elegant "hud" in you game, and while charging set in the hud a logo or animation with "loading", best regards