Time range picker - android

I would like to build this google calendar’s timeslot-picker but unfortunately, there is unfortunately no similar online tutos or blogs explainging so. I have no single idea how to start it. Anyone can give me some hints which Flutter widgets I need to use to build it?
It also has two dots to make the timeslot longer or shorter..
I appreciate your help.

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Get REAL date and time from internet in android studio

First of all, I know that there are many questions like mine. However, I cannot understand that solutiona or they just doesn't work. So, I don't need the date and time from DEVICE. I need the real date and time in the Asia/Tashkent. Also i tried the way with
DateFormat.getDateTimeInstance():
This one shows device date and time too. In other words I need the date which user will not be able to manipulate by changing device date. At least just advice some useful APIs e.t.c.
I know that there is a lot of such kind questions. Also, please, explain which part of the code is used for what.
This solution seems simple to me. Give it a try.

What is the best way to measure performance time of android app?

I tested two ways of query processing time.
The first one is currentTimeMillis().
The second one is startMethodTracingSampling.
I got different result times of using two of them.
I wanna know which is the best way to measure.
Thanks to you.
Please help me.
The "best" way is to use the tools provided by Google called the Performance Profiler Tools. They are built into android studio and let you profile your app performance and show other interesting information without you having to add any code.
See https://developer.android.com/studio/profile/index.html

Unable to use chart libraries in Android

Can any one please tell me how to create a bar-chart in Android?
After I did some searches on Google then I got the solution as, there are two approaches to achieve this concept.
Using
"Achartengine" or
"kiCharts" approach
As per the search every one is recommending to use "Achartengine approach" because it is fully open source, this is the official link to this approach that I found.
Then I downloaded that file from the above link and I imported it into Eclipse but its not supporting. When I am trying to run that project it's showing like the below images.
Even though if I try to do access or while clicking any options on the emulator (here shown in the second image) it's showing up the with same result as "sorry your app unexpectedly closed!. Please try again. Force Close"
I don't know whether I am going in a wright way or not.
Can any one please explain this concept by sending at least one example program done using the AChartEngine approach.
OR
Please at least send me the steps to create a BAR-CHART using the AChartEngine approach.
Thanks for your precious time!..

Replicating the iOS time picker in Android

I'm trying to write an app that would use the timepicker in Android, but I really would like to implement the one from iOS.
I've had a couple of leads, but haven't struck anything that has worked for me.
My problem is that the time picker is for time but I want to use mine for three different number values that can be chosen (no am/pm) so it seems like Pickers are the way to go, except that they were introduced in API 11.
I've found this blog that seems to give you some code for it, but I wasn't able to get it to work.
I also found android-wheel, but I don't know how to get the source for it. Can anyone steer me in the right direction for it?
The iOS timepicker looks like this:
Android wheel looks like this:
But, I haven't been able to figure out how to get the code for it.
The code is in the google code project - https://code.google.com/p/android-wheel/source/browse/
Download the source code from below link for various wheel example:
http://android-wheel.googlecode.com/svn/trunk/
Make sure that you have the svn plugins for download.
Thanks.

Where to find Android Development Homework Problems

Ok so I am starting off with android development and I have found a bunch of useful tutorials so I am set there. What I am looking for is a resource that provides homework style problems to do and has the answers downloadable so I can check my solution against the "official" solution.
So for example instead of the notepad tutorial it would be: "Build an application that you can create, edit, delete notes, ...etc.". Ideally the "official" solution would have some explanation as to why they built it the way they did. (so a tutorial at the tail end)
Anyone know of any resources that provide their tutorials in this format?
Thanks.
Okay, here's one: build me an app that allows the user to make, modify, and store notes. The 'official' answer is the Notepad app in the 9th level of the api. (Note that this is different from the notepad tutorial).
The point is that asking questions is easy, the harder part is actually making a program that does the job. And #Roflecoptr is right, at this level it can be implemented very differently. But if you want that mindset, you can write your own 'homework' easily. Just think up a few things you want that are simple, build it, does it do what you want well? Then you pass.
Despite for very trivial problems I dont think this is possible, because there are way to much possible implementation possibilites so that you can't compare your solution to the "official" solution.
But why do you need something like that? If you want to learn to program on Android, you can just follow some tutorials you've already found and then modify them, adapt them to your needs. When you get more used to the development of Android apps you can just get some ideas on tutorials/android development sites and then implement your own solution. There is plenty of help available here on SO and on other development sites, which will help you if you really get stuck.
You could always go to the Android Samples page, and without looking at their implementations, do your own and compare. The samples page is here:
http://developer.android.com/resources/samples/index.html

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