Use VirtualBox to run Android apps on Mac KO Player KO Player is an emulator software that allows Android apps run on Mac. This is basically an application to play Android games on your Mac. Android gamers and content creators can benefit largely from this software. Before debugging can occur on a device, it must be setup for development and connected to your PC or Mac. Debug Application. Once a device is connected to your computer, debugging a Xamarin.Android application is done in the same way as any other Xamarin product or.NET application. Ensure that the Debug configuration and the external device is selected in the IDE, this will ensure that the necessary. RELATED: 10 Quick Ways to Speed Up a Slow Mac. App Crashes: How Software Can Slow Down Your Mac. When software isn’t working correctly, it can make your machine seem unresponsive. Sometimes, just the app that’s crashed exhibits this behavior; other times, misbehaving software might attempt to take your whole machine down with it. Running Your App in the Simulator or on a Device. Choose a Scheme. A scheme is a collection of settings that specify the targets to build, the build configuration, and the executable environment for. Select a Simulated Device. Select a Real Device.
There’s a wide variety of tools and features to help debugFlutter applications. Here are some of the available tools:
DevTools
For debugging and profiling apps, DevTools might bethe first tool you reach for. DevTools runs in abrowser and supports a variety of features:
If you run your application in debug mode orprofile mode, while it’s running you can openDevTools in the browser to connect to your app.DevTools doesn’t work well with an app compiled torelease mode, as the debugging and profilinginformation has been stripped away.
If you use DevTools for profiling, make sure torun your application in profile mode. Otherwise,the main output that appears on your profile are thedebug asserts verifying the framework’s various invariants(see Debug mode assertions).
For more information, see theDevTools documentation.
Setting breakpoints
You can set breakpoints directly in your IDE/editor(such as Android Studio/IntelliJ and VS Code),in the DevTools debugger,or programmatically.
The Dart analyzer
If you’re using a Flutter enabled IDE/editor,the Dart analyzer is already checking your codeand looking for possible mistakes.
If you run from the command line,test your code with
flutter analyze .
The Dart analyzer makes heavy use of type annotations thatyou put in your code to help track problems down.You are encouraged to use them everywhere (avoiding
var ,untyped arguments, untyped list literals, and so on)as this is the quickest and least painful way of trackingdown problems.
For more information, see Using the Dart analyzer.
Logging
Another useful debugging tool is logging.You set logging up programmaticallythen view the output in the DevToolslogging view, or in the console.
Debugging application layers
Flutter was designed with a layered architecture that includeswidget, rendering, and painting layers. For links to moreinformation and videos, see The Framework architecture on theGitHub wiki, and the community article, The Layer Cake.
The Flutter widget inspector provides a visual representationof the widget tree, but if you want a greater level of detail,or you want a verbose text-based dump of the widget,layer, or render trees, seeDebug flags: application layersin the Debugging Flutter apps programmatically page.
Debug mode assertions
During development, you are highly encouraged to use Flutter’sdebug mode. This is the default if you use bug icon inAndroid Studio, or
flutter run at the command line.Some tools support assert statements through thecommand-line flag --enable-asserts .
In this mode, Dart assert statements are enabled,and the Flutter framework evaluates the argumentto each assert statement encountered during execution,throwing an exception if the result is false.This allows developers to enable or disable invariantchecking, such that the associated performance costis only paid during debugging sessions.
When an invariant is violated, it’s reported to theconsole, with some context information to help trackdown the source of the problem.
For more information, see
Assert in theDart language tour.
Debugging animations
The easiest way to debug animations is to slow them down.The Flutter inspector provides a Slow Animations button,or you can slow the animations programmatically.
For more information on debugging janky (non-smooth)applications, see Flutter performance profiling.
Measuring app startup timeDebug App Download
To gather detailed information about the time it takes for yourFlutter app to start, you can run the
flutter run commandwith the trace-startup and profile options.
The trace output is saved as a JSON file called
start_up_info.json under the build directory of your Flutter project.The output lists the elapsed time from app startup to these traceevents (captured in microseconds):
https://cleverdogs387.weebly.com/itunes-dj-app-mac.html. For example:
Tracing Dart code
To perform a performance trace,you can use the DevTools Timeline view.The Timeline view also supports importingand exporting trace files. For moreinformation, see the Timeline view docs.
You can alsoperform traces programmatically,though these traces can’t be importedinto DevTool’s Timeline view.
Be sure to use run your app in profile modebefore tracing to ensure that the runtime performancecharacteristics closely matches that of your final product.
How To Run Debug App Mac OsPerformance overlay
To get a graphical view of the performance of your application,turn on the performance overlay. You can do this in theby clicking the Performance Overlay button in theFlutter inspector.
Uml diagram app mac. You can also turn on the overlay programmatically.
For information on how to interpret the graphs in the overlay,see The performance overlay inthe Flutter performance profiling guide.
Debug flags
In most cases, you won’t need to use the debug flagsdirectly, as you’ll find the most useful debuggingfunctionality in the DevTools suite. But if youprefer to use the debug flags directly, seeDebug flags: performance in theDebugging Flutter apps programmatically page.
Common problems
The following is a problem that some have encountered on MacOS.
“Too many open files” exception (MacOS)
The default limit for Mac OS on how many files it can have open at atime is rather low. If you run into this limit,increase the number of availablefile handlers using the
ulimit command:
If you use Travis or Cirrus for testing, increase the number ofavailable file handlers that they can open by adding the same line toflutter/.travis.yml, or flutter/.cirrus.yml, respectively.
Widgets marked const that should be equal to each other, aren’t
In debug mode, you may find that two
const widgets that should to allappearances be equal (because of Dart’s constant deduplication) are not.
For example, this code should print 1:
It should print 1 (rather than 2) because the two constants are the same and setscoallesce duplicate values (and indeed the analyzer complains that“Two elements in a set literal shouldn’t be equal”). As expected, in releasebuilds, it does print 1. However, in debug builds it prints 2. This is because theflutter tool injects the source location of Widget constructors into the code at compiletime, so the code is effectively:
This results in the instances being different, and so they are not deduplicated by the set.We use this injected information to make the error messages clearer whena widget is involved in an exception, by reporting where the relevant widget was created.Unfortunately, it has the visible side-effect of making otherwise-identical constants bedifferent at compile time.
To disable this behavior, pass
--no-track-widget-creation to the flutter run command.With that flag set, the code above prints “1” in debug and release builds, and error messagesinclude a message saying that they cannot provide all the information that they would otherwisebe able to provide if widget creation tracking was enabled.
See also:
Other resources
You might find the following docs useful:
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