License: Apache License 2.0
Solution code for the Android Basics in Kotlin: Tip Calculator app.
The Tip Calculator app contains various UI elements for calculating a tip, teaching about app structure, user input, and view binding.
URL of codelab
In which task and step of the codelab can this issue be found?
Step 3: Launcher Icons
Describe the problem
Under Explore Launcher Icons, the text of the tutorial says to click on the image file to see a preview. However, clicking isn't enough unless one has enabled "Open Files wIth Single Click". It would be more accurate to say that you need to open the image file in Android Studio to see the preview.
Also, the tutorial says to click on res > mipmap-xxhdpi > ic_launcher_round.png and to notice that the image is 192 x 192 pixels. However, the image is 142 x 142 pixels. The 192 x 192 image is in the res > mipmap-xxxhdpi folder
Steps to reproduce?
Versions
Android Studio version: 4.1.1
API version of the emulator: N/A
Additional information
Include screenshots if they would be useful in clarifying the problem.
Task 5
It is a very basic query regarding the floorArea function, which when we are using for roundTower, should have the formula, PIradiusradius, as the formula which is stated by you is valid for the volume, because it's unit is meter-cube, not meter-square, so either correct the formula or correct the name for function used.
Steps to reproduce?
Versions
Android Studio version:
API version of the emulator:
Additional information
Include screenshots if they would be useful in clarifying the problem.
URL of codelab
https://developer.android.com/codelabs/basic-android-kotlin-training-change-app-icon#8
In which task and step of the codelab can this issue be found?
Last step
9. Learn more
Describe the problem
"DONE" button missing
Steps to reproduce?
When i try to reproduce steps its work well but in new tub .
Versions
Android Studio version: 4.1
developer.android.com-1603404335200.log.log
bandicam 2020-10-23 00-55-03-926.zip
API version of the emulator:
Additional information
Microsoft Edge
Version 86.0.622.48 (Official build) (64-bit)
In which task and step of the codelab can this issue be found?
7. Summary
Describe the problem
The section that says "Use the super keyword to reference functions and properties in the parent class." is wrong. I did not use super keyword nor am I asked to use it during the Codelab lesson.
Steps to reproduce?
Versions
Android Studio version: 4.1.1
API version of the emulator: not relevant
In which task and step of the codelab can this issue be found?
At the end of the page of step 4: Create XML layouts for Android
Describe the problem
Typo / copy and paste error:
In the last code-example:
"At this point, your XML should look like this."
The textview still has the copied id from the EditView (@+id/cost_of_service) instead of the before mentioned @+id/service_question
i know this is a very minimal issue, and considered before making this issue/report.
But when i notice issues like that, i always start to question the overall quality of the work that people put into something.
So i think it would be nice if it would be fixed, for the benefit of the people doing this course later.
:-)
and isn't it nice that so far no bigger issues came up?
best regards
In which task and step of the codelab can this issue be found?
Implement floorArea() for RoundTower
8
Note: For the area values, it would be a nicer user experience to only show a couple of decimal places. This is out of scope for this codelab, but you could print the floor area using this: println("%.2f".format(floorArea))
Describe the problem
println("%.2f".format(floorArea)) -> println("Floor area: %.2f".format(floorArea()))
Steps to reproduce?
Versions
Android Studio version:
API version of the emulator:
Additional information
Include screenshots if they would be useful in clarifying the problem.
-> Create XML layouts for Android -> 6. Complete the rest of the layout ->
You want the Switch to be as wide as the parent, so you might think the width should be set to match_parent. As noted earlier, you can't set match_parent on UI elements in a ConstraintLayout
info out-dated: is possible use match_parent in switches and buttons at least
Styles and Themes
I type this code in "@style/Widget.TipTime.CompoundButton.Switch" and got the red error text for the "@style/Widget.TipTime.CompoundButton.Switch", and I tried copying it direct but the result was same. Eventually, I tweaked it till it work and the resulting code I ended up with is "@style/Widget.TipTime.Switch". The codes seems fine but since am only learning, am sure it is right but wanted to highlight this in case some else gets stuck at that same exercise
Steps to reproduce?
Versions
Android Studio version: 4.1.1
API version of the emulator: 25
Additional information
Include screenshots if they would be useful in clarifying the problem.
In which task and step of the codelab can this issue be found?
5. Modify classes in the hierarchy
Implement floorArea() for RoundHut
Describe the problem
"The floor area of a circular dwelling is 2 * PI * radius."
I think 2 * PI * radius is a circumference. The area is PI * radius * radius
Further in the code samples it is correct.
In which task and step of the codelab can this issue be found?
step 5
Describe the problem
typo: "The floor area of a circular dwelling is 2 * PI * radius." should be "PI * radius * radius" or "PI * radius2" (square)
Steps to reproduce?
Versions
Android Studio version:
API version of the emulator:
Additional information
Include screenshots if they would be useful in clarifying the problem.
URL of codelab
In which task and step of the codelab can this issue be found?
The problem is in the "Calculate the tip" task, step 4.
Describe the problem
This line:
binding.tipResult.text = getString(R.string.tip_amount, formattedTip)doesn't work. This just sets binding.tipResult.text to simply "Tip Amount", and does not include formattedTip.
Steps to reproduce?
N/A? Or just follow the codelab.
Versions
Android Studio version: 4.0.1
API version of the emulator: 23
Additional information
I am a beginner in Kotlin and Android Studio but I think I've solved it.
getString() is supposed to convert an integer to string (I'm not really sure how, all I know is that R.string.tip_amount is an integer) but the codelab is trying to feed an integer and a string into it.
I've got it to work properly using this:
binding.tipResult.text = "${getString(R.string.tip_amount)} $formattedTip"If you're curious, this is my strings.xml:
<resources>
<string name="app_name">tip calculator</string>
<string name="round_up_tip">Round up tip?</string>
<string name="ok_15">OK (15%)</string>
<string name="good_18">Good (18%)</string>
<string name="amazing_20">Amazing (20%)</string>
<string name="how_was_the_service">How was the service?</string>
<string name="cost_of_service">Cost of Service</string>
<string name="calculate">Calculate</string>
<string name="tip_amount">Tip Amount</string>
</resources>URL of codelab
https://developer.android.com/codelabs/basic-android-kotlin-training-tip-calculator#2
In which task and step of the codelab can this issue be found?
3. View binding
Describe the problem
Section -> Enable view binding
buildFeatures {
viewBinding = true
}
Should change to
android {
viewBinding.enabled = true
With newer version
URL of codelab
In which task and step of the codelab can this issue be found?
Describe the problem
My Progress on the codelabs keeps getting refresh and logging me out of the developer page for some reason
Steps to reproduce?
Versions
Android Studio version:
API version of the emulator:
Additional information
Include screenshots if they would be useful in clarifying the problem.
URL of codelab
In which task and step of the codelab can this issue be found?
Step 5, area of a circle
Describe the problem
You mention the area is 2 * PI * radius but then correct in the code block and say it's radius * radius * PI
See attached images
Steps to reproduce?
Versions
Android Studio version:
API version of the emulator:
Additional information
Include screenshots if they would be useful in clarifying the problem.
Task and the Step:
Task: Adopting good coding practices
Step: Inspect the code
Problem:
According to the documentation in the Inspect Code Step of this task, an option starting with text "file..." should be there. But I couldn't find it in my android studio. Please refer the images below:
Documentation Image:
Android Studio Image:
Android Studio version: 4.1.1 for Windows 64-bit
Please help :)
In which task and step of the codelab can this issue be found?
6 - Change the app icon
Describe the problem
Under "Move vector drawable files into -v26 directory
Depending on the min SDK of your app, you may notice that the background asset is located in the drawable-v24 folder, while the foreground asset is in the drawable folder. The reason is because the background asset contains a gradient, which was available starting in the Android 7.0 release (also known as API version 24, hence the -v24 resource qualifier). The foreground asset doesn't contain a gradient, so that can go in the base drawable folder."
The references to foreground and background have been switched. The foreground file is in the drawable-v24 folder and has a gradient. The background doesn't have a gradient.
Steps to reproduce?
Versions
Android Studio version: N/A
API version of the emulator: N/A
Additional information
Include screenshots if they would be useful in clarifying the problem.
URL of codelab
https://developer.android.com/codelabs/basic-android-kotlin-training-classes-and-inheritance?authuser=1#4
In which task and step of the codelab can this issue be found?
Step 5
Describe the problem
It's just a problem in the concept of circular area, you say: "The floor area of a circular dwelling is 2 * PI * radius" but the area is pi*r^2 and what you said is the perimeter... Probably it's just a minor mistake but I hope it helps to improve your course which so far is the best i have taken
URL of codelab
https://developer.android.com/codelabs/basic-android-kotlin-training-change-app-icon#5
In which task and step of the codelab can this issue be found?
steps 4 and 5 in "Move vector drawable files into -v26 directory"
Describe the problem
Description of steps 4 and 5 in "Move vector drawable files into -v26 directory" is incorrect
Steps to reproduce?
Go to step 13(Confirm icon path..)
zoom up picture below step 13,check the folder for foreground and background xmls.
ic_launcher_background.xml - is in drawable-v24
ic_launcher_foreground.xml - is in drawable
go to step "Move vector drawable files into -v26 directory".
4 .steps 4 and 5 tells u that
ic_launcher_background.xml - is in drawable
ic_launcher_foreground.xml - is in drawable-v24
It should be vice versa(folders for launcher layers) in android studio its also vice versa.
(Left click on the ic_launcher_background.xml file and drag it from the drawable folder into the drawable-anydpi-v26 folder. Recall that putting a resource in an "any dpi" directory indicates that it's a resource that can scale to any density.
Left click on the ic_launcher_foreground.xml and drag it from the drawable-v24 folder into the drawable-anydpi-v26 folder.)
Versions
Android Studio version: 4.1
API version of the emulator:
Additional information
Include screenshots if they would be useful in clarifying the problem.
In which task and step of the codelab can this issue be found?
in the NOTE:
Describe the problem
the line of code is missing the parenthesis for the floorArea funciton.
println("%.2f".format(floorArea))
it should be : println("%.2f".format(floorArea()))
Steps to reproduce?
Versions
Android Studio version:
API version of the emulator:
Additional information
Include screenshots if they would be useful in clarifying the problem.
In which task and step of the codelab can this issue be found?
3.Launcher Icons
Describe the problem
"For example, this is what res > mipmap-xxhdpi > ic_launcher_round.png looks like. Also notice the size of the asset is in the top right. This image is 192px x 192px in size."
it is not the xxhdpi image it is the xxxhdpi image which is 192x192 big
Steps to reproduce?
Versions
Android Studio version:
Android Studio 4.1
URL of codelab
https://developer.android.com/codelabs/basic-android-kotlin-training-classes-and-inheritance#4
In which task and step of the codelab can this issue be found?
Under the Heading "Implement floorArea() for RoundHut, Line three, which says, "The floor area...."
Describe the problem
The formula written is 2PIradius, but here we are calculating area so it should be PIradiusradius.
It's correct in the code but statement is wrong. So it might mislead someone.
Steps to reproduce?
Versions
Android Studio version:
API version of the emulator:
Additional information
Include screenshots if they would be useful in clarifying the problem.
In which task and step of the codelab can this issue be found?
Section "Create an abstract Dwelling class"
Describe the problem
Step 2 mentions deleting all code in the editor, while I believe it means just removing the println("Hello, world!") part inside main()
Step 8 asks us to put code inside main() which may have been deleted due to the way Step 2 is written
Steps to reproduce?
Read step 2, then proceed with next steps until step 8
In which task and step of the codelab can this issue be found?
Implement floorArea() for RoundHut
Describe the problem
The floor area of a circular dwelling is 2 * PI * radius.
I think this is the formula for circumference rather than area. Maybe PI* radius * radius or similar is the area?
Steps to reproduce?
Versions
Android Studio version:
API version of the emulator:
Additional information
Include screenshots if they would be useful in clarifying the problem.
In which task and step of the codelab can this issue be found?
val stringInTextField = binding.costOfService.text.toString()
Describe the problem
Well its not that big issue but it would be nice to have a check the input value before calculating the Tip. I have added the below code just after getting the text from Cost of Service which will prevent the app from crash.
if (stringInTextField.isEmpty()){
val toast = Toast.makeText(this,"Please enter cost of service!",Toast.LENGTH_SHORT)
toast.show()
return
}
Steps to reproduce?
Versions
Android Studio version:
API version of the emulator:
Additional information
Include screenshots if they would be useful in clarifying the problem.
In which task and step of the codelab can this issue be found?
In task 5 . Modify classes in the hierarchy and Implement floorArea() for RoundHut step
Describe the problem
Just a minor "typo"
You write in the 3rd line that the area of a circle is 2PIR, while its PI * R ^2.
In the code you use you the correct formula, but not when you explain what to do
In which task and step of the codelab can this issue be found?
8. Summary
Describe the problem
Mistype in attribute name: checkRadioButtonId instead of checkedRadioButtonId
Steps to reproduce?
Versions
Android Studio version:
API version of the emulator:
Additional information
Include screenshots if they would be useful in clarifying the problem.
URL of codelab
https://developer.android.com/codelabs/basic-android-kotlin-training-change-app-icon
In which task and step of the codelab can this issue be found?
"Move vector drawable files into -v26 directory"
Describe the problem
"Move vector drawable files into -v26 directory" section has dubious instructions and references options that do not exist where stated.
Steps to reproduce?
Step 1 of this section says, "First create the drawable-anydpi-v26 directory. Right click on the res folder. Select New > Android Resource Directory."
Step 2 says, "A prompt will appear. Select these options:
Resource type: drawable (Select from dropdown)
Directory name: drawable-anydpi-v26
Source set: main (leave as default)"
A prompt does appear, but there's no option or heading labeled "Source set".
Step 3, "Click OK. In the Project view, verify the new resource directory res > drawable-anydpi-v26 has been created."
Skipping the "Source set" stuff and clicking OK does not result in a new resource directory "res > drawable-anydpi-v26". It instead makes a directory "res > drawable > drawable-anydpi-v26"
Versions
Android Studio 4.1.1
Build #AI-201.8743.12.41.6953283, built on November 4, 2020
Runtime version: 1.8.0_242-release-1644-b3-6222593 amd64
VM: OpenJDK 64-Bit Server VM by JetBrains s.r.o
Linux 5.4.58-07649-ge120df5deade
GC: ParNew, ConcurrentMarkSweep
Memory: 1246M
Cores: 4
Registry: ide.new.welcome.screen.force=true, external.system.auto.import.disabled=true
Non-Bundled Plugins: org.jetbrains.kotlin
Current Desktop: Undefined
Additional information
In which task and step of the codelab can this issue be found?
Create Styles
Step-7
the RadioButton Style:
Describe the problem
Steps to reproduce?
Versions
Android Studio version:
API version of the emulator:
Additional information
Include screenshots if they would be useful in clarifying the problem.
In which task and step of the codelab can this issue be found?
3. Launcher Icons
Step 4
Describe the problem
This is the current text:
For example, this is what res > mipmap-xxhdpi > ic_launcher_round.png looks like. Also notice the size of the asset is in the top right. This image is 192px x 192px in size.
Miss an x for res folder or change the size image to 144 x 144
In which task and step of the codelab can this issue be found?
Step 6
Describe the problem
The 4th paragraph of the section (Optional) Adjust the tint of the vector drawables has a typo:
One visual enhancement we can make to the app is to tint the drawable based on the primary color of the app theme. BFor light theme, the icon will appear...
The typo is as seen Before, "Bfor".
Steps to reproduce?
Versions
Android Studio version: N/A
API version of the emulator: N/A
Additional information
URL of codelab
https://developer.android.com/codelabs/basic-android-kotlin-training-classes-and-inheritance
In which task and step of the codelab can this issue be found?
Describe the problem
Instead of 'The floor area of a circular dwelling is 2 * PI * radius.'
should be 'The floor area of a circular dwelling is PI * radius * radius'
Additional information
Include screenshots if they would be useful in clarifying the problem.
In which task and step of the codelab can this issue be found?
Google Developer course to learn build and program an android apps. In unit 2: Layouts, Calculate the Tip codelab.
Describe the problem
_ I found a difference between the two showing. In codelab they ask me to put this Code:
class MainActivity : AppCompatActivity() {
lateinit var binding: ActivityMainBinding
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
binding = ActivityMainBinding.inflate(layoutInflater)
setContentView(binding.root)
binding.calculateButton.setOnClickListener{ calculateTip() }
}
fun calculateTip() {
}
}
but when I put it into Android Studio I found this wrong alert as this screenshot. And there's no any guidance in the codelab shows that I could find an issue as usual
So. What should I do?_
Versions
Android Studio version: 4.1.1
Additional information
A screenshot
URL of codelab
In which task and step of the codelab can this issue be found?
Describe the problem
Steps to reproduce?
Versions
Android Studio version:
API version of the emulator:
Additional information
Include screenshots if they would be useful in clarifying the problem.
In which task and step of the codelab can this issue be found?
(Optional) Adjust the tint of the vector drawables
Describe the problem
Typo in text
Steps to reproduce?
Versions
Android Studio version: 4.1
API version of the emulator:
Additional information
Include screenshots if they would be useful in clarifying the problem.
URL of codelab
In which task and step of the codelab can this issue be found?
Enable View Binding
Describe the problem
I was receiving an error and realized it's because I'm not running AS 4.0+. You may want to add a note about this issue for versions sub 4
Steps to reproduce?
Versions
Android Studio version:
API version of the emulator:
Additional information
Include screenshots if they would be useful in clarifying the problem.
In which task and step of the codelab can this issue be found?
Implement floorArea() for RoundHut: Description
Describe the problem
Mentioned formula in the description is wrong but used in step 2 is right
Steps to reproduce?
Versions
Android Studio version:
API version of the emulator:
Additional information
Include screenshots if they would be useful in clarifying the problem.
Classes and inheritance in Kotlin
5. Modify classes in the hierarchy
Implement floorArea() for RoundHut
(...)
The floor area of a circular dwelling is 2 * PI * radius.
(...)
area is wrong: instead 2 * PI * radius, is PI * radius * radius
In Unit 2: Layouts, Step 7: Change the app icon, there is a spelling mistake in the last Note: "closet", which should be "closest"
Otherwise this is great work!
In which task and step of the codelab can this issue be found?
11. Practice on your own
Describe the problem
At the End there is no DONE button. I've tried to do it with other browser and none was able to show me the button (chrome & firefox), in Fedora 32
Steps to reproduce?
Versions
Android Studio version:
API version of the emulator:
Additional information
Include screenshots if they would be useful in clarifying the problem.
almost at the very end, when you need to start the application for testing, a piece of code does not work: "binding.tipResult.text = getString (R.string.tip_amount, formattedTip)"
I did everything according to the instructions. The moment has come for testing the application. I started it all worked, entered the text into the "EditText" and clicked "Calculate", but some of the code did not work correctly. I had to replace this code: "binding.tipResult.text = getString (R.string.tip_amount, formattedTip)" like this: "binding.tipResult.text = getString (R.string.tip_result_text) +" "+ formattedTip" and it worked correctly.
Steps to reproduce?
Versions
Android Studio version: 4.0.2
API version of the emulator: I don't know where to look at it :(
Additional information
Include screenshots if they would be useful in clarifying the problem.
In which task and step of the codelab can this issue be found?
The floor area of a circular dwelling is 2 * PI * radius.
Describe the problem
The formula show for the area is incorrect, 2PIradius it should be PI * radius * radius
Steps to reproduce?
Versions
Android Studio version:
API version of the emulator:
Additional information
Include screenshots if they would be useful in clarifying the problem.
URL of codelab Here
In which task and step of the codelab can this issue be found?
CALCULATE TIP - STEP 3 (VIEW BINDING)
Describe the problem
Following through the steps, while initializing the binding object. I am required to replace all existing code in the MainActivity.kt file with the provided code snippet which didn't include defining package com.example.tiptime, which later caused an error in the activity_main.xml causing the App to crash.
Steps to reproduce?
package com.example.name which in my case package com.example.tiptime at the very top of the MainActivity.kt file.In which task and step of the codelab can this issue be found?
Step 3), when we update the constructor to pass the radius we used: val radius; Int, but also modified the line for the residents, I think we should add the "val' in front of residents because it comes from the abstract class
Describe the problem
I think is not necessary to have the 'val', I run the code with out it and it runs, not problem.
Steps to reproduce?
Versions
Android Studio version:
API version of the emulator:
Additional information
Include screenshots if they would be useful in clarifying the problem.
In which task and step of the codelab can this issue be found?
Android Basics Kotlin Unit 2 Pathway 1
Create a More Polished User Experience
Section 4 Icons
Step 6
Describe the problem
The code snippit says:
`
<TextView
android:id="@+id/service_question"
...
android:layout_marginTop="16dp"
app:layout_constraintStart_toEndOf="@id/icon_service_question" />
`
Specifically app:layout_constraintStart_toEndOf="@id/icon_service_question" is the main point of interest
Based on https://github.com/google-developer-training/android-basics-kotlin-tip-calculator-app-solution/blob/main/app/src/main/res/layout/activity_main.xml#L73, I believe it should be
<TextView android:id="@+id/service_question" ... android:layout_marginTop="16dp" app:layout_constraintStart_toStartOf="@id/cost_of_service" app:layout_constraintTop_toBottomOf="@id/cost_of_service"/>
Prior to looking up the solution by jumping ahead to the solution code, I was unable to get the TextView's left side to align with the Material TextInputLayout above it; the TextView would be on top of the icon.
Steps to reproduce?
Follow the codelabs tutorial.
Versions
N/A
Additional information
error
URL of codelab
Any codelab page. Needs to be on mobile device.
Describe the problem
This isn't specific to any single codelab; it applies to all of them.
When viewing using Chrome 86.0.4240.185 on my Pixel 2, the "Next" and "Back" buttons are cut off almost entirely. It's as if the android bar with the triangle (back), circle (home), and square (recent apps) is not accounted for and it overlays on top of the "Back" and "Next" buttons in codelab. See screenshot attachment.
I am viewing using the mobile view. If I select "Use desktop view" in Chrome, the buttons are not visible at all.
Steps to reproduce?
Versions
Chrome 86.0.4240.185
Pixel 2
Additional information
See screenshots
URL of codelab
In which task and step of the codelab can this issue be found?
Step 3: Themes | Separate Styles from Themes
Describe the problem
You do not need to do the steps in this section if you are using Android 4.1 or later
Not an issue but an interesting point. I updated my AS with my TipTime project already created and though I'm on AS 4.1, my themes.xml didn't appear because when I created the project I was on 3.6.
You may want to mention this in case other users update midway, though I also recognize this is probably an edge case 🤷♂️
Steps to reproduce?
Versions
Android Studio version:
API version of the emulator:
Additional information
Include screenshots if they would be useful in clarifying the problem.
In which task and step of the codelab can this issue be found?
Step 5: Modify Classes in the Hirearchy -> Implement floorArea() for RoundHut
Describe the problem
It's written "The floor area of a circular dwelling is 2 * PI * radius." which is incorrect. The formula is for calculating the circumference of a circular dwelling rather than the area.
Steps to reproduce?
Versions
Android Studio version:
API version of the emulator:
Additional information
Include screenshots if they would be useful in clarifying the problem.
URL of codelab
https://developer.android.com/codelabs/basic-android-kotlin-training-change-app-icon#2
In which task and step of the codelab can this issue be found?
At step 4
Describe the problem
For example, this is what res > mipmap-xxhdpi > ic_launcher_round.png looks like. Also notice the size of the asset is in the top right. This image is 192px x 192px in size.
xxhdpi should be replaced with xxxhdpi
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