Questions tagged [android]
Android is Google's software stack for mobile devices. For non-developer questions, see http://android.stackexchange.com
815
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WeakReference in AsyncTask
I want to use the WeakReference approach to not leak memory with my AsyncTask. I found examples online and on Stackoverflow, but ...
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Android SQLite database with 3 tables
I want to show you the SQLiteOpenHelper and Contract class for a little quiz app I made for practicing purposes. I have 3 tables ...
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Restoring the instance state of an SQLite quiz app in Android
The following class is the activity of a little SQLite quiz app, which takes care of showing the actual quiz. Other than that the app only has a starting screen.
I want to save the instance state and ...
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Android: Make a Quiz-App
Task description
Make an quiz-app based upon a topic you feel familiar with!
Following requirements
Has at least four questions.
Following controls are all used at least one time: Button, TextView,...
- 3,990
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Subscribing to multiple sources in RxJava
I have used RxJava to Observe multiple sources and then perform action depending upon values of Observables. I want to know if it can be further simplified.
Goal:
Complete implementation of RxJava.
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AES Encryption/Decryption with key
Is this the best way to encrypt/decrypt data?
And Is it good to store Generated InitVector and CipherText in database as Base64 String which is converted from byte[]?
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Android Service Recording Camera
I've built a service that records a camera.
The aim of this service is mostly to record video while the app is in the background.
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Android SharedPreferences Utility
I just created a utility class for Android shared preferences. I want to know it is working well on other users device and useful for learners.
My code in gist
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335
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I want to get weekdays for common time sets from the following hashmap
I have the following HashMap :
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271
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Decoupling UI code from game logic
IIUC I should decouple UI logic from the model and controller in my project. I didn't succeed and had to resort to TextView etc in my game logic:
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Static class for constants with reference to java resources
I want to store the colors I use in the colors.xml file. In addition to using them in an xml-layout, I also want to use these colors in my Java code, when drawing ...
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Android RecyclerView Adapter: Passing normal clicks and menu clicks over the same activity
I am unsure about my approach here. As you can see, I want to send normal clicks and 2 different menu item clicks back to the underlying activity over an interface. Now I wonder if it is bad practice ...
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Sending data to an API with Retrofit 2.0
In my application, I want to post the version name and manufacturer name to a server using retrofit. Are there any bad parts in the code below?
POJO:
...
- 525
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Android mini adventure
I make a mini adventure game demo for Android where the player can move between places and NPC characters can enter and exit the places and perform random actions.
The "dirty" code is the UI for ...
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Using Asynctask with MVP architectural pattern
I am working on a simple android app to learn MVP. I am using synchronous OkHttp with AsyncTask for retrieving data from a REST ...
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194
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Mini game for android
For Android in this mini game the monkey catches nice bananas and coconuts.
It was somewhat more problematic to create the layout in XML compared to the small game engine and controls.
Maybe we ...
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Tic Tac Toe on Android
Can someone review my Tic Tac Toe Code? I tried to make it as compact as I could. What could I improve?
I save the state of the buttons by adding freezesText="true"...
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118
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Linear search on array
I've recently used this block of code from a quiz app where I check an array for the correct answer that was received from the browser and sent to the mobile device/application.
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Reading file from flash with Xamarin.Forms on Android using ActionOpenDocument intent with StartActivityForResult
I have a Xamarin.Forms application which utilizes dependency services to access Android specific features, in this case file access on the storage.
The file we are accessing is a serialized .xml file ...
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552
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Picasso's Transformation class to Crop borders from Image
It's a implementation of Transformation from Picasso library looks for the first different pixel color in both sides, in the vertical and horizontal, and crops the bitmap from there.
Here is the ...
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Android application using RecyclerViews to list games in a Fragment
I am implementing MVP architecture, code works fine, I wanted your suggestions if I there can be improvements done or in any areas where I am not following the pattern correctly.
It is a simple ...
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Adventure game for Android
Features
Abstract class World.java which works for basically any game
Game engine class Simulation.java which steps forward time and introduces random events
Walking persons, places and connections ...
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4
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Simple audio player to play music using a URL built using MediaPlayer in Android
I wanted to create a very basic application for Android that plays an audio file based on a URL input. I would like it to be reviewed based on good programming practices. This is the first time that I ...
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Filter results on response
I call remote server to get my result. Result might contain artist,track and album depends on API method but there will be only one response (artist or track or album) at a time. It mean the other two ...
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Painting a lot of diagrams for a board game
I'm creating a chess application and I would like to show plenty of big chess diagrams in scrollview. At the moment I just create ImageView for every diagram, create bitmap into it, paint the diagram ...
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Putting thread in sleep while waiting for BroadcastReceiver
I'm a little puzzled about a procedure inside my Android app. It's actually working but it looks like bad practice and probably it lowers performances.
Short explanation: I'm running a separate ...
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Detecting if image taken by camera is too dark
I am trying to build functionality to check if an image taken by the camera is too dark. So I added the following 2 functions to a utility class:
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182
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Android login with strategy pattern not using command pattern
I have login code that I'm working for my social network. I am wondering if this is good coding standards or if there is some modifying I should do. Can anyone explain what can be done?
Here is the ...
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261
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Search GitHub users when text field changes in Kotlin Android app
Problem: Search for users by their name using the GitHub API (sorted by the number of followers) and display the results in a RecyclerView.
Implementation: Hitting the GitHub API every time when user ...
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171
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Dagger 2 test application
I have a complicated Dagger 2 use case on Android, where I have a lot of dependencies, but some of them are really slow to construct. Like 2-3 seconds slow.
My solution was to create an RX ...
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Remove repetitive code for multiple spinners using one listener
I managed to setup multiple spinners using one listener but there is a lot of repetition in the code.
My full onItemSelected method:
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- 25
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Creating String from a bitmask
In my Android app I store days of week in an int variable by using bit masking.
I'm using the following SparseIntArray to get ...
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102
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Android Smartband2 Reader in Xamarin
This code was written a long time ago but has probably gotten a bit deprecated now and I wonder how it can be improved. It's for an xamarin cross-platform project for IOS and Android but this part is ...
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Loop to check isNullOrEmpty then setVisibility & setText
My code below is working fine but I know it can be done more efficiently using a loop.
I'm checking the VAL (such as description, ingredient2, etc.) which are Strings from my SQL lite Db to see if ...
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Updating the UI without leaking the context after an Android AsyncTask finishes
In the past I always did AsyncTasks as private inner classes. The tutorials I found still recommend this (see here, here, here, and here). However, this has the potential to leak the context. Now ...
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Personal project for managing photos
I have wrote a small project for Android. It's an app which lets you to take a photo (or find one with Flickr) and save it in the cloud (Cloudinary).
Link to the GitHub repository.
Should MVP layers ...
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235
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LED controller for a BLE device with the ability to change color and intensity in Android
It's been long since I have put any of my codes for review. Today I want to review my Android code written for a BM70_BLE device with which one can change the color and brightness of the LED light. ...
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498
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Phaser game runs good on desktop but lags on mobile
I am creating my first game using Phaser and it is running fine in desktop. But it is lagging on Android phones.
Can anyone tell me what could be the reasons?
The game is very small -- smaller than ...
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2k
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Generic Adapter with search and sort functionality
I have tried to create a GenericAdapter that can help you search, sort automatically without writing a lot of code.
But in order to use this you have to follow ...
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2
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2
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147
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Trying to Store EditText Values in SharedPrefs using a Single addTextChangedListener
The code is completely functional but I'd rather not call two functions when I know it can be done more efficiently. My goal is to store EditText values in SharedPrefs using a single ...
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Espresso tests that check if Snackbar is displayed and if there is an internet connection
I have recently began writing tests for Android using the espresso library.
Here I have three tests.
The first test is to check if a snackbar appears when searching with blank text.
The second is a ...
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3
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2
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518
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Storing realm objects using Kotlin extensions
I am a Java Android Developer and I'm approaching Kotlin.
I have defined the following class:
open class Player : RealmObject() {
...
}
And I defined the ...
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64
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Android continually run api request
What is the best practice to run continually api request, like every 1-10 seconds.
Currently I am doing this which is not a good practice I think, it probably causes some overhead:
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91
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Discrete slide mechanism (with average rating display) for liking posts on a social network app
I'm thinking about implementing a "liking" mechanism for a social network app (using Parse) whereby users select a value from a discrete slider beneath each post. The slide would range from 0-5 and ...
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3
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SlotMachine game as first Android app
After learning a bit of Android Java I've chosen to make a tiny game so that I can use the learned techniques in a real app.
I had the idea of a slot machine simulator:
You press a button and it ...
- 3,990
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805
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Handling single items using MVVM and Android Architecture Library
What I have done so far
Since I would like to rebuild a project using mvvm-pattern with the following requirements to use dagger 2 for di, RXJava for reactive, retrofit for webservices, greendao and ...
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587
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Soldier class, with health points
Recently I completed the encapsulation lesson and I made a simple android app implementing encapsulation, I had difficulties understanding encapsulation.
My Soldier class:
...
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1
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142
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A Route Finding Android app
I've recently taken an interest in Android applications and I have been working on an app regarding the travelling salesman problem.
My app is a kind of a trip optimizer which is meant for travelers, ...
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137
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Writing service/network layer for mobile apps
I have an app that gets and posts blog posts to and from a server.
Right now I have a network client object which is passed into a service object. The service object is created and called from an ...
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Google Maps Directions API
I'm looking for all kinds of feedback: style issues, missed corner cases, performance etc.
My code is regarding Google Maps Directions API that is a service that calculates directions between ...
- 41