Why does my game loop give me a blank screen?

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TL;DR Summary

I've used a game loop to try make a textView alternate between two different strings every two seconds. I just get a blank screen.

Hi everyone

I've used a game loop to try make a textView alternate between two different strings every two seconds. When I run it, I just get a blank screen. The textView was originally set to show "Hello World!" but not even that shows.

Does anyone know what's gone wrong?

Thanks

[CODE lang="java" title="GameLoop"]public void GameLoop() {
double timeChange = 0;
double time1 = System.nanoTime();
double time2;

while (true) {
time2 = System.nanoTime();
timeChange += (time2 - time1) / 1000000000;
time1 = time2;
textView.setText("fadsjfsdjfklsjfklsadjf");
if (timeChange > 2) {
textView.setText("2");
timeChange = 0;
}
}
}[/CODE]
Logcat says:

[CODE lang="java" title="logcat"] E Not going to handle 'com.xxmassdeveloper.gamelooptest'!
2023-03-01 09:45:53.278 3598-3598 SDAgentPac...teReceiver pid-3598 E Not going to handle 'com.xxmassdeveloper.gamelooptest'!
---------------------------- PROCESS STARTED (25862) for package com.xxmassdeveloper.gamelooptest ----------------------------
2023-03-01 09:45:55.291 25862-25862 AppCompatDelegate com.xxmassdeveloper.gamelooptest D Checking for metadata for AppLocalesMetadataHolderService : Service not found
2023-03-01 09:45:55.388 25862-25862 PhoneWindow com.xxmassdeveloper.gamelooptest D forceLight changed to true [] from com.android.internal.policy.PhoneWindow.updateForceLightNavigationBar:4238 com.android.internal.policy.DecorView.updateColorViews:1510 com.android.internal.policy.PhoneWindow.dispatchWindowAttributesChanged:3216 android.view.Window.setFlags:1148 com.android.internal.policy.PhoneWindow.generateLayout:2444
2023-03-01 09:45:55.390 25862-25862 MultiWindowDecorSupport com.xxmassdeveloper.gamelooptest I updateCaptionType >> DecorView@2059f86[], isFloating: false, isApplication: true, hasWindowDecorCaption: false, hasWindowControllerCallback: true
2023-03-01 09:45:55.391 25862-25862 MultiWindowDecorSupport com.xxmassdeveloper.gamelooptest D setCaptionType = 0, DecorView = DecorView@2059f86[]
2023-03-01 09:45:55.626 25862-25862 er.gamelooptes com.xxmassdeveloper.gamelooptest W Accessing hidden method Landroid/view/View;->computeFitSystemWindows(Landroid/graphics/Rect;Landroid/graphics/Rect;)Z (greylist, reflection, allowed)
2023-03-01 09:45:55.628 25862-25862 er.gamelooptes com.xxmassdeveloper.gamelooptest W Accessing hidden method Landroid/view/ViewGroup;->makeOptionalFitsSystemWindows()V (greylist, reflection, allowed)
---------------------------- PROCESS ENDED (25862) for package com.xxmassdeveloper.gamelooptest ----------------------------
2023-03-01 09:47:39.554 3598-3598 SDAgentPac...teReceiver pid-3598 E Not going to handle 'com.xxmassdeveloper.gamelooptest'!
2023-03-01 09:47:39.786 3598-3598 SDAgentPac...teReceiver pid-3598 E Not going to handle 'com.xxmassdeveloper.gamelooptest'!
---------------------------- PROCESS STARTED (26539) for package com.xxmassdeveloper.gamelooptest ----------------------------
2023-03-01 09:47:41.959 26539-26539 AppCompatDelegate com.xxmassdeveloper.gamelooptest D Checking for metadata for AppLocalesMetadataHolderService : Service not found
2023-03-01 09:47:42.042 26539-26539 PhoneWindow com.xxmassdeveloper.gamelooptest D forceLight changed to true [] from com.android.internal.policy.PhoneWindow.updateForceLightNavigationBar:4238 com.android.internal.policy.DecorView.updateColorViews:1510 com.android.internal.policy.PhoneWindow.dispatchWindowAttributesChanged:3216 android.view.Window.setFlags:1148 com.android.internal.policy.PhoneWindow.generateLayout:2444
2023-03-01 09:47:42.044 26539-26539 MultiWindowDecorSupport com.xxmassdeveloper.gamelooptest I updateCaptionType >> DecorView@2059f86[], isFloating: false, isApplication: true, hasWindowDecorCaption: false, hasWindowControllerCallback: true
2023-03-01 09:47:42.044 26539-26539 MultiWindowDecorSupport com.xxmassdeveloper.gamelooptest D setCaptionType = 0, DecorView = DecorView@2059f86[]
2023-03-01 09:47:42.235 26539-26539 er.gamelooptes com.xxmassdeveloper.gamelooptest W Accessing hidden method Landroid/view/View;->computeFitSystemWindows(Landroid/graphics/Rect;Landroid/graphics/Rect;)Z (greylist, reflection, allowed)
2023-03-01 09:47:42.237 26539-26539 er.gamelooptes com.xxmassdeveloper.gamelooptest W Accessing hidden method Landroid/view/ViewGroup;->makeOptionalFitsSystemWindows()V (greylist, reflection, allowed)
---------------------------- PROCESS ENDED (26539) for package com.xxmassdeveloper.gamelooptest ----------------------------
[/CODE]

 

[pbuk]

Does anyone know what's gone wrong?

You can't just keep running forever - even game loops have to sleep sometimes!

 

[limkokhole]

UI thread will no resource to draw if you setText endless without quit the current method which is the same thread. And UI thread is not for holding your code for long time without release periodically.