243 lines
3.1 KiB
Plaintext
243 lines
3.1 KiB
Plaintext
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Application
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Programming
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Hend Alkittawi
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Debugging
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How To Debug Java Code and Android
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Applications
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DEBUGGING ANDROID APPLICATIONS
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-
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Some of the problems you may
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encounter while building android
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applications. The application may
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crash at runtime or not function as
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expected!
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As an IDE, Android Studio has some
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tools to help developers debug their
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code. These tools are:
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The Logcat
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Android Lint
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The Debugger
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THE LOGCAT
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When an application is running, the Logcat tool window
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provides access to diagnostic messages.
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The log output displays messages which are created using the
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Log class
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The syntax to create a log diagnostic message is
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Log.[logLevelInitial]("TAG", "Message")
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Some of the available log levels:
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Information, Verbose, Debug, Error
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the log level and the tag helps with filtering messages
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Example: Log.d("PeekActivity", "Button Clicked!")
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THE LOGCAT
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ANDROID LINT
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Android Lint is a static analyzer for Android code
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a program that examines your code to find defects without
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running it
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Android Lint is aware of the Android framework components and
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and can find problems that the compiler cannot find.
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For example, it is good for finding issues in XML files.
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To run Android Lint: Code > Inspect Code the click Analyze
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ANDROID LINT
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THE DEBUGGER
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The debugger is a tool mainly used to run the application under
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controlled conditions that permit the developer to track its
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execution and monitor changes in computer resources that may
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indicate malfunctioning code.
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To control the application execution, add breakpoints to your
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code lines.
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A breakpoint next to a line of code pauses the execution before
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the line executes and allows you to examine what happens next.
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To run the application in debug-mode, add breakpoint(s) then
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Run > Debug
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THE DEBUGGER
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When using the debugger, the developer can control the app execution:
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Step Into
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A method is about to be invoked, and you want to debug into the code of that
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method, so the next step is to go into that method and continue debugging
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step-by-step.
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Step Over
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A method is about to be invoked, but you're not interested in debugging this
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particular invocation, so you want the debugger to execute that method completely
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as one entire step.
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Step Return
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You're done debugging this method step-by-step, and you just want the debugger to
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run the entire method until it returns as one entire step.
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Resume
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You want the debugger to resume "normal" execution instead of step-by-step
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p
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THE DEBUGGER
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1.
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k
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ea
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r
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b
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g
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2.
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bu
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e
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D
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nt
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i
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po
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3. Control execution
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Tra
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ck
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exe
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cut
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ion
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ap
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DEBUGGING ANDROID APPLICATIONS
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|||
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-
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When errors persist, some things you can try
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-
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Recheck the xml in resource files
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Clean the project build
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-
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Build > Clean Project
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-
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Android studio will rebuild the project from scratch
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Clean the project
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File > Invalidate Caches/Restart
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-
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Android Studio will perform some maintenance on the project
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and restart itself
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-
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Check online :)
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|||
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CODE DEMO
|
|||
|
|
-
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|||
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|||
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Show the different
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|||
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|
tools in Android
|
|||
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Studio.
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|||
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|||
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DO YOU HAVE ANY
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|||
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QUESTIONS?
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THANK
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|||
|
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YOU!
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|||
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|||
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@
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|||
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|||
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hend.alkittawi@utsa.edu
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|||
|
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By Appointment
|
|||
|
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Online
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|||
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|||
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