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    Tuesday, September 18, 2018

    Home Unlabelled The (re)making of a Download Manager Android Dev

    The (re)making of a Download Manager Android Dev

    7 years ago

    The (re)making of a Download Manager Android Dev

    The (re)making of a Download Manager

    Posted: 18 Sep 2018 01:02 PM PDT

    What is the future of Java on Android?

    Posted: 18 Sep 2018 08:13 AM PDT

    I know most of the developers are moving towards using Kotlin in their code, but whats the future of Java on Android? do they plan to keep updating the used Java version on the platform? or it will stick to the current version and eventually stopped being updated?

    submitted by /u/mosh_java
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    30 summertime Android libraries and tools which you don’t want to miss in 2018

    Posted: 17 Sep 2018 11:19 PM PDT

    Quantum: State management library for Android

    Posted: 18 Sep 2018 11:36 AM PDT

    Hey guys,I wanted to share my state management library "Quantum" with you 😊Feedback is very much appreciated. Hopefully this can make your life much easier 👍https://github.com/sellmair/quantum

    Backstory

    As AirBnb released their MvRx, I was absolutely overwhelmed and got obsessed about the way they handle there state inside the ViewModel using this StateStore. Unfortunately, because of legal constraints, our team was not allowed to use MvRx for certain projects. It was at that moment that I played around with this idea of a 'State Owner' for myself and figured that this concept could be abstracted and used for multiple scenarios (not just view model only).

    Core Features of Quantum

    • Thread safe access and mutation of states
    • Low memory footprint: Since Quantum uses a thread pool by default to apply reducers
    • Custom threading options: Pool, Thread, Sync, Custom (just apply an executor)
    • Debugging: Optionally enable history of states
    • Rx and LiveData extensions

    Some last few words:I pushed really hard to get the implementation correct, but it was surprisingly much more work than expected! Since I am now really confident, I am trying to hit the 1.0.0 in the next few weeks. It made my life easier for now and I hope it makes yours easier as well, cheers! 🍻

    submitted by /u/fablue
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    Anyone make real money on sites like upwork or freelancer?

    Posted: 18 Sep 2018 06:29 AM PDT

    I've actually considered this for a side gig but I always see the flock of devs offering development for $10/hr less and quite frankly that's not enough to mess with it. I was curious if anyone has made decent income from it. I don't expect 6 figures but more than $100/mo would be nice to hear about.

    submitted by /u/ZeikCallaway
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    What's the best way to securely delete a file on Android?

    Posted: 18 Sep 2018 12:00 PM PDT

    Once written to a local file, what is the best way to securely delete said file? I see a lot of contradictory answers on StackOverflow and I don't see anything in the docs.

    submitted by /u/PrimeMover17
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    Is it possible to create an app that's secure from access from any other app and data collection?

    Posted: 18 Sep 2018 01:36 PM PDT

    I'm curious if it's even possible on android to have an app that is secure (like for medical and intelligence records that need clearance). Is it possible to wall out access from android's data collection, marketing, and prevent other apps from requesting or obtaining access to it?

    submitted by /u/NumenSD
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    Using Gfycat API to retrieve gif?

    Posted: 18 Sep 2018 03:37 PM PDT

    Does anyone have any experience with retrieving a gif/mp4 from Gfycat? I'm looking through the Gfycat API documentation(https://developers.gfycat.com/androidsdk/#gfycat-core-sdk) and I'm not seeing an easy way to make a simple request to get a gif/video by ID.

    I have the submission id (such as "PhysicalAdmirableBeagle") and I am looking for a way to play it in my reddit app.

    submitted by /u/ambits
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    What is the good way to handle this problem with productFlavors

    Posted: 18 Sep 2018 02:37 PM PDT

    Hello guys!

    I'm in really interesting situation about my project right now. So briefly I have 3 different build variant, my productFlavor tag looks something like this:

     productFlavors { A { ... } B { ... } C { ... } }

    I also use sourceSets to differ each build variant's resources:

     sourceSets { A { res.srcDirs = ... java.srcDirs = ... } B { res.srcDirs = ... java.srcDirs = ... } C { res.srcDirs = ... java.srcDirs = ... }

    So whats really bothering me is more like a quality code/good practice type of problem.

    Let's just say that I create a specific class in the MainActivity, for example a Button. Now based on the architecture that I'm on, I can easily customize the Button's text label, color, size for every single build variant. Simply I can make different style.xml for each productFlavor. Well...How about removing the class(Button) for one of the builds.

    ​

    One solution could be to remove/comment the implementation while I'm in the build variant and build the APK...that's is meh

    The second solution could be add another xml for each product flavor, let's call in config.xml. And in that xml I can add boolean true/false for each of classes that could be added/removed in some point of the development. And to finish this logic I have to check:

    if (button_available) { Button button = new Button(); ... }

    ​

    Both ways feels kinda hardcoded. Is there some better ways to make this type of structure. Hopefully I was able to explain my question. I'm open for any suggestions :)

    submitted by /u/KungFuFlames
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    Render Problem (total noob question, but I just started this today)

    Posted: 18 Sep 2018 04:08 PM PDT

    At the bottom of my screen it says Render Problem with a red exclamation mark thing next to it. It also says, "Failed to load AddCompat ActionBar with unknown error."

    I have the latest version of Android Studio. I've been working at this for a while and I can't find a solution. I've tried refreshing, reloading the program, hell even restarting my computer, but this thing will not go away. I haven't modified anything in the app (it's at default) so I don't know how there could be a screw up already anyway. Please help, I'm really excited to get this show on the road. And before anyone says anything, yes I have googled it and all the answers are either for outdated Android Studio versions or don't work.

    submitted by /u/Somegirlonlinesaid
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    Shared Element Transitions are coming in Navigation 1.0.0-alpha06! ��

    Posted: 18 Sep 2018 12:06 AM PDT

    Calculator app

    Posted: 18 Sep 2018 07:56 AM PDT

    Hi all, i wanna build a nice, well-designed calculator app. Can you recommend some sources from which I can begin.

    submitted by /u/EloodeD
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    Android Studio - Emulator Crashing

    Posted: 18 Sep 2018 10:00 AM PDT

    Hello,

    I am trying to start my first application. I installed Android Studio and created a Virtual Device (Pixel 2), than tryed to run the hello world program. it poped up showing the frame for the pixel 2, than exited code 0. VCPU issued the shutdown.

    after that happened a few times. i tried a different api level. and that caused my computer to crash and reboot. than it would not show any of my virtual devices. so i deleted everything in that folder and created a new one. and now that crashes my pc every time.

    ​

    Computer:

    Windows 10 Pro 64bit;

    (2x) Intel Xeon 5160 Processors

    24 GB RAM. (typicaly 20gb free)

    160gb free hard drive space (on its drive)

    Using RDP to connect to it.

    submitted by /u/jchalo99
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    [QUESTION] Kotlin as DSL, generating properties

    Posted: 18 Sep 2018 08:15 AM PDT

    I'm writing a small DSL implementation for a project of mine, to simplify BLE communication. The goal is to have a similar structure:

    val btDevice = device { service { name = "ServiceName" id = UUID.fromString("0x180d") // Possibly modify this to hide the UUID characteristic<T> { // The T type is the data coming from, going to the device // A global converter cache is used to resolve it // Other implementations exist: <T1,T2> (for reading and writing) // and <T1,T2,T3> (for reading, writing and notify/indicate) name = "CharacteristicName" id = "0x18d" // See above comment mode = read and write and notify } } }

    This part I can do, I've already written the code for it. Right now I have a Device object that has a list of services, and each service has a list of characteristics.

    However what I'd like to achieve is to have some automatically generated properties based on the characteristics and services. So the above definition in use could work this way (name field, normalized):

    btDevice.ServiceName.CharacteristicName.read() btDevice.ServiceName.CharacteristicName.write(data: T) btDevice.ServiceName.CharacteristicName.notify()

    Obviously the methods available would depend on the "mode" field, which is an enum with a little bit of extensions:

    enum class CharacteristicMode { read, write, notify; infix fun and(other: CharacteristicMode): EnumSet<CharacteristicMode> = CharacteristicModes.of(this, other) } typealias CharacteristicModes = EnumSet<CharacteristicMode> infix fun CharacteristicModes.allOf(other: CharacteristicModes) = this.containsAll(other) infix fun CharacteristicModes.and(other: CharacteristicMode): EnumSet<CharacteristicMode> = CharacteristicModes.of(other, *this.toTypedArray())

    The characteristics would also have a LiveData<T> field for the read/notified value:

    btDevice.ServiceName.CharacteristicName.data

    The rest of the glue code would go into the Device class, including converters for types, BLE callback handling, scanning, connection, etc., so the end user would only have to define the device, and use a single instance of said device to communicate with it (practically making the solution as simple as a REST interface, not just by design but by usage too). The Device itself would be the GATT handler and an altogether AIO solution, a black box of ugly code to make BLE great again.

    However I'm stuck on the property generation part. For now I use a map of characteristics, and a companion object to name the services, characteristics, so that I can do the following (the services and characteristics map types have an overridden invoke operator to run get() on them):

    btDevice.services(SERVICE_NAME_UUID).characteristics(CHARACTERISTIC_NAME_UUID).read() btDevice.services(SERVICE_NAME_UUID).characteristics(CHARACTERISTIC_NAME_UUID).data

    Is there a way to achieve my goal and simplify this down to my goal definition?

    ​

    submitted by /u/fonix232
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    Anybody know which SDK violates the google play advertising policy?

    Posted: 17 Sep 2018 07:17 PM PDT

    The email says:

    Reason for warning: Violation of Usage of Android Advertising ID policy and section 4.8 of the Developer Distribution Agreement Google Play requires developers to provide a valid privacy policy when the app requests or handles sensitive user or device information. We've identified that your app collects and transmits the Android advertising ID, which is subject to a privacy policy requirement

    Here are the libraries I'm using, does anyone know if there I am using a library that violates the policy?

    build.gradle: https://github.com/premnirmal/StockTicker/blob/master/app/build.gradle

    Update: So it seems like Crashlytics is passing the advertising ID, even on the latest version. For this reason, I created a privacy policy and linked it in the app and in the app details on the google play store. Thanks for all your help towards resolving this!

    submitted by /u/premnirmal88
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    Unboxing Chrome – Hannah Lee – Medium

    Posted: 17 Sep 2018 11:01 PM PDT

    Kotlin and the rise of Multiplatform

    Posted: 18 Sep 2018 02:50 AM PDT

    Learning to write a notification app - training material

    Posted: 18 Sep 2018 02:00 PM PDT

    I would like to learn how to write a notification app. My idea was to write a very basic app which shows a notification as soon as you, for example update a specific text file or word document on your pc.

    However I am not so sure how feasible something like this is, nor could I find any sample tutorials that might help me create something similar.

    submitted by /u/Santorju
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    Room: is it possible to build composite objects from a many-to-many relationship?

    Posted: 18 Sep 2018 09:49 AM PDT

    I'm building a little task app that has a tagging system using some architecture components (Room, LiveData, ViewModel). A Task can be tagged with any number of Tags, and a Tag can be associated with any number of Tasks. In my list (RV) that shows all Tasks, I also want each list item to show all Tags associated with the Task. My ideal solution is to create a composite object that contains a Task and a List<Tag> of all of its associated Tags, and have the Adapter work with these objects. However, I've been unsuccessful in figuring out a way to get Room to split this out (rather than observing the tables separately and manually assembling the objects and updating the views).

    So far my research has concluded that Room currently isn't capable of doing this, but I thought I'd ask here as it seems like something it should be able to do. If not, I'd be interested in opinions on the best way to approach this problem.

    Here are my entities:

    @Entity(tableName = "tasks") public class Task { @PrimaryKey(autoGenerate = true) @ColumnInfo(name = "id") private long mId; // ... } @Entity(tableName = "tags") public class Tag { @PrimaryKey(autoGenerate = true) @ColumnInfo(name = "id") private int mId; // ... } @Entity(tableName = "tasks_tags", primaryKeys = { "task_id", "tag_id" }, foreignKeys = { @ForeignKey(entity = Task.class, parentColumns = "id", childColumns = "task_id", onDelete = CASCADE), @ForeignKey(entity = Tag.class, parentColumns = "id", childColumns = "tag_id", onDelete = CASCADE)}, indices = { @Index("tag_id") }) public class TaskTag { @ColumnInfo(name = "task_id") private long mTaskId; @ColumnInfo(name = "tag_id") private int mTagId; // ... }

    The closest I've gotten is this POJO containing a Task and a list of the tagIds of its associated tags (just query all Tasks and Room automatically handles fetching the relevant rows from tasks_tags using the @Relation):

    public class TaskWithTags { @Embedded private Task mTask; @Relation(parentColumn = "id", entityColumn = "task_id", entity = TaskTag.class, projection = "tag_id") private List<Integer> mTagIds; // ... }

    This, combined with observing the tags table separately makes it easy to display all the Tags for a Task (loop through the list of Tags and pull the names for all the tagId's that exist in the Task's tagId list). However, handling a Tag renaming still seems annoying (manually go through all the list item looking for any tag views that need their text updated?).

    Another idea I had is to use GROUP_CONCAT to select all associated tags in a single column, then use a TypeConverter to turn this into my desired list of Tags, but I've been unable to get Room to actually do anything with this column when attempting to populate my composite POJO.

    @Query("SELECT tasks.*, GROUP_CONCAT(tags.id || ':' || tags.name) as tag_list FROM tasks_tags " + "JOIN tasks ON tasks.id = tasks_tags.task_id " + "JOIN tags ON tags.id = tasks_tags.tag_id " + "GROUP BY tasks.id ") LiveData<List<TaskWithTags>> loadAllTasksWithTags(); // ... @TypeConverter public static List<Tag> toTagList(String groupConcat) { List<Tag> tags = new ArrayList<>(); for (String tagString : groupConcat.split(",")) { String[] tagStringArray = tagString.split(":", 1); tags.add(new Tag(Integer.parseInt(tagStringArray[0]), tagStringArray[1])); } return tags; }
    submitted by /u/TheRealSplinter
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    Notifications in Android are horribly broken

    Posted: 18 Sep 2018 09:55 AM PDT

    doesn't an android app know my real IP even if I used vpn?

    Posted: 18 Sep 2018 05:12 AM PDT

    asking as a user, not developer
    i thought that one of the most common permissions is for the app to know the device's real IP even while behind VPN. Or is this wrong? What's a sure way to not let an app know my real IP?
    edit: top line

    submitted by /u/Funstill
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    Optimisation for BlackBerry devices?

    Posted: 18 Sep 2018 02:49 AM PDT

    I've been asked to investigate optimising our app for black berry devices, specifically the new android variants that have hit the market over the past few years.

    I've always focused on optimising apps for the usual suspects, namely Nexus, Pixel and Samsung but this would be a first for me. The app is aimed at the business sector so I can see why I've been asked to look into this.

    Anyone have experience with optimising for blackberry devices with some insight into pitfalls or concerns during optimisation? My first guess is improving accessibility for keyboard support and ensuring support for the versions of android that these devices cover in terms of market share.

    submitted by /u/KaruiCodeWarrior
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    How much does my app cost?

    Posted: 18 Sep 2018 06:40 AM PDT

    I will be developing an android app for client, with ecommerce features, he is the only vendor and its admin panel will be done on web (you guys can suggest for Firebase like services).

    Note: I read the rules and didn't found anything about costing the apps, please point if I violated

    submitted by /u/NoConversation8
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