I have been wondering about this, which is why I have put off learning app development for so long. Let's say I was making a school timetable app, that all the user had to do was enter the name of their course, and then the app shows the timetable for that course..
The questions is can I get information from the college or do I have to hard code it into the database myself?
How does one get information to use if they need it?
Thanks
It depends. Does the college provide you an interface you can use? Probably not one that was meant to be used by a third party app.
If not, then you have to somehow get the information into your database. Either per parsing their online HTML schedules or inputing it by hand (obviously always one of the last options to consider).
If the college had a website that you could view, you could scan the page for class listings and pull that data in - but more than likely that sort of data will need to be entered manually by you when you ship the app.
If college is having its website and the website provides RSS feed for time table you parse that XML file and show the data which is parse or you can save the time table information of which course in the database and display that using cursors.
Related
I am building an app include edit text and button. The user can put text in the edit text, then click button to transfer him to the browser.
So, I would like to create other layout as recent to store the text that the user entered on the edit text.
How I can do that? I need the logic or code that can help me!
Also, should I have create database to store the data?
Example:
enter image description here
You can store data in multiple ways, and you will need to understand what is right for your use case. You can store data in memory, by simply creating a List with your data type and adding to it every time user will click a button, but then it will not persist between sessions with the app.
If you want the data to persist, then you would need to use permanent storage, and there are a lot of options here:
You could use Shared Preferences
You could use File System and save the data to a file
You could use a database i.e SQLite, and store data there
You could use external server, and get the data through REST API.
Generally, there is a good overview of data storage in Android in the documentation which also have code examples.
Every option comes in multiple ways to accomplish it. There are built-in solutions, and multiple libraries to help you with this task, but first of all, you will need to understand what is the predicted usage of this data. I.E Should user have access to the data from another device? Should the data be available offline? Will data have complex structure? How the app can expand in the future? e.t.c.
Only by knowing this you can design how you will handle it.
If you need logic or code to create view, then you will need ListView, or RecyclerView, Adapter for handling the data, extra xml layout file for single item of your data.
Trying to make an app in android studio that works as a fitness helper/tracker. On a daily basis and multiple times a day, the user enters data regarding their diet/exercise. Prior to doing so, the user selects which day they're currently on, making the data they input specific to the chosen date. I want to give users the ability to retrieve any available data for a specific day on demand.
I don't quite think sharedPreferences would work, so I was thinking about just saving to internal storage as a text file. The problem is that 1) with all the different files that would be created for even a single day, I feel that it would get messy and 2) I'm not sure how how to retrieve the specific file I'd need, parse it, then output the parsed data graphically if I'm only using a single constructor to make each text file.
I haven't yet delved deeply into using a SQLite DB, it seemed somewhat excessive for this, so I'm hoping someone can either help me figure out a better way to solve the problem or enlighten me as to a more efficient method.
Thanks in advance!
I have to implement custom search in my application for android 2.3.I have some EditText in which user type one letter and then I send response to the server, retrieve all the results matches this one letter and then I need to display them in a list. When user types second button I also need to send new response and refresh data and so on.
The question how can I do this in Android 2.3? What should i use?
This seems to be too open ended with too many questions to give a really helpful answer.
What you use in your app will heavily depend on how the server's API is expecting you to communicate. I, for one, am all for hiding the specifics of what a server does from the application and put all the "smarts" behind the API. So a query like:
http:/blah.com/getresults?search=a
would result in whatever matches 'a'. If it is searching a MySql Db, processing a Google search, or accessing files on the system doesn't matter.
Your code needs to worry about the interface to the API to make queries and processing the results, whether they're free formatted text, JSON objects, or whatever.
Maybe rewording your question or provide information on what you know would help.
I've made an Android application which contains most used German words and sentences. The application contains a CSV file which stores all the data.
Currently it is working as expected but I want to ask if there is a better way to store such data directly in the app?
I'm also thinking about the ability to update the data via internet like adding new words and sentences.
Thanks!
Miretz
If you want to modify the content (update, remove etc.) I would suggest using SQLite DB which has a pretty nice built-in integration with the Android platform.
There are 2 types SQLDatabaseLite and SharedPreference. Major difference between both is that one is organized and the other not so.
If you need a quick use of a storage facility within your app for example changing text sizes between activity SharedPrefference works best for you.
If you have a complex database system where you need more than one data to be saved for a particular event SQLDatabaseLite is for you example of this is spreadsheet of data for customers; Name, Phone Number, etc.
I am currently developing a program with Java that collect and illustrate IP traffic from similar information and draw the graph of this information.
So I must use rrd4j rrd with java to save the data flow from a JTable in another table first and then use RRDTool to draw the graph .
but my problem is how to have the info stored in rrd and also how to create database RRD4J
thank you
First of all I would check rrd4j project home page and check some documentation. On the main page there is usage example of how you create the database and I think it's quite clear and no needed to be explained, since it would be copy+paste.
Now what about storing the information.. First of all you need to define how much and what type of data you want to store. For example in the project I'm working, we are aggregating data daily, weekly, monthly and yearly. You also need to specify what is the frequence of data collection: because it really makes difference if it's 5 seconds or 5 minutes.
You should also have a look at former rrd project homepage and ganglia, the part where you defining the RRD files creation, it will really help you to understand how RRDTool and data storing works.