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QUESTION
This code receives information from an acquaintance you want to register in editText, and then clicks finButton to save the information you receive as a file called friendlist.txt. However, the Toast message is outputted from the try-catch statement that is currently performed when finButton is pressed. Also, the checkpermission does not work, which is wrapped in a try~catch statement, but does not have output on the logcat.
And manifest.
uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"
uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"
is written.
Please let me know the solution. And this content is written with a translator, so the sentence can be strange.
when you press finButton, the logcat is shown below.
The code corresponding to the 116th line is this.
...FileOutputStream outstream = openFileOutput("friendList.txt", Activity.MODE_WORLD_WRITEABLE);
ANSWER
Answered 2021-Jun-16 at 01:47Try with Context.MODE_APPEND or Context.MODE_PRIVATE instead of Activity.MODE_WORLD_WRITEABLE
QUESTION
Can not remove the glow effect on over-scroll in TabLayout
with ViewPager2
.
I have tried android:overScrollMode="never"
and android:fadingEdge="none"
but it doesn't work.
ANSWER
Answered 2021-Jun-15 at 19:09You're right, android:overScrollMode="never"
is not disabling the over scroll effect.
The respective issue created on the issue tracker:
https://issuetracker.google.com/issues/134912610
But you can try workaround, described in this answer.
QUESTION
I'm following a tutorial about RecyclerView, but I can't write ct:
the way he did. I typed in manually, but it does not work. I'm not sure how he typed it. He typed in this
, then android studio writes ct:
automatically. What do I need to type to do that?
MyAdapter is a class I created for RecyclerView. Here is the code for that class:
...ANSWER
Answered 2021-Jun-15 at 19:45The little lighter colored "ct" prompt is just a visual aid and it does not always show up. When you provide a raw value as an argument, it will show the prompt (like this, 1, or "foo"). When you provide a variable for the argument like ctx, foo, etc, it does not show up. This goes for all functions that take arguments.
The moral of the story is, it is not important and can be ignored.
QUESTION
I'm new to Kotlin and i'm playing a bit with android studio from few days. This is the class i'm dealing with:
...ANSWER
Answered 2021-Jun-15 at 18:10let
returns the result of last expression inside it, in this case the value of builder.create()
, a non-nullable AlertDialog.
Since you use ?.let
, if activity
is null, let
won't be called, and you will effectively have null ?: throw...
.
builder.create()
never returns null, so this throw
expression is only reached when activity
is null, so the error message doesn't make sense.
QUESTION
Collapsing toolbar layout and the recycler view should work together while swiping but working separately. suggest to me what to do! given below are my code and resulting gif part of my project.
the toolbar layout is not showing fully if I swipe the screen from bottom to top. the toolbar layout is closed and only return if I swipe to toolbar layout separately.
i want to toolbar layout to be in the same manner when i swipe the screen up and down.
Code of my layout
...ANSWER
Answered 2021-Jun-15 at 16:32Try this:
QUESTION
I'm trying to import compose sample projects, but I'm facing this error:
...ANSWER
Answered 2021-Jun-15 at 15:23The version 202.7660.26.42.7322048
is
QUESTION
I want to use firebase auth for my android and ios applications with custom backend. So I need some way of authentication for api calls from mobile apps to the backend.
I was able to find following guide in firebase documentation which suggests to sent firebase id token to my backend and validate it there with firebase Admin SDK. https://firebase.google.com/docs/auth/admin/verify-id-tokens
But this approach does not seem to be a security best practice. For example here https://auth0.com/blog/why-should-use-accesstokens-to-secure-an-api/ it is said that for API access one should use access tokens rather than id tokens.
Are there any good pattern for using firebase auth with my backend?
...ANSWER
Answered 2021-Jun-15 at 15:02firebaser here
Firebase itself passes the ID token with each request, and then uses that on the server to identify the user and to determine whether they're authorized to perform the operation. This is a common (I'd even say idiomatic) approach to authentication and authorization, and if there's a security risk that you've identified in it, we'd love to hear about it on https://www.google.com/about/appsecurity/
From reading the blog post it seems the author is making a distinction between authentication (the user proving their identify) and authorization (them getting access to certain resources based on that identity), but it'd probably be best to ask the author for more information on why that would preclude passing an ID token to identify the user.
QUESTION
I am trying to work with Hilt injection in my project. I added the dependecies into my build.gradle file and then i created the the base application class, this class inherits from Applcication() and i annotated it with @HiltAndroidApp. After doing this i went ahead and rebuild the project for Hilt to generate the files but it give me this error.
...ANSWER
Answered 2021-Feb-16 at 13:11Upgrade your dagger-hilt dependencies to the same version.
Your project's root gradle file
classpath "com.google.dagger:hilt-android-gradle-plugin:2.31.2-alpha"
Your app level gradle file
implementation "com.google.dagger:hilt-android:2.31.2-alpha"
kapt "com.google.dagger:hilt-android-compiler:2.31.2-alpha"
QUESTION
I've been experimenting with the Kotlin coroutines in android. I used the following code trying to understand the behavior of it:
...ANSWER
Answered 2021-Jun-15 at 14:51This is exactly the reason why coroutines were invented and how they differ from threaded concurrency. Coroutines don't block, but suspend (well, they can do both). And "suspend" isn't just another name for "block". When they suspend (e.g. by invoking join()
), they effectively free the thread that runs them, so it can do something else somewhere else. And yes, it sounds like something that is technically impossible, because we are in the middle of executing the code of some function and we have to wait there, but well... welcome to coroutines :-)
You can think of it as the function is being cut into two parts: before join()
and after it. First part schedules the background operation and immediately returns. When background operation finishes, it schedules the second part on the main thread. This is not how coroutines works internally (functions aren't really cut, they create continuations), but this is how you can easily imagine them working if you are familiar with executors or event loops.
delay()
is also a suspending function, so it frees the thread running it and schedules execution of the code below it after a specified duration.
QUESTION
My problem is that, I have a List of Icons(CustomWidgets) what are provide by an API. I need put this icons in my App but when the are 7 or more its looks like these:
I want to put the icons in separate rows. I've tried out a method which split the list in 2 and add it dynamically but didn't print anything because I'm using a FutureBuilder to print the Icons.
Here is the code:
...ANSWER
Answered 2021-Apr-16 at 01:34What I suggest is to use Wrap instead of Row in your case, widget will place in the 2nd row is not enough space
THERE IS THE WAY TO DO IT:
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