Android :: JAVA Coding Standards For Phone Platform
Jul 17, 2009
I wanted to check whether there is any JAVA Coding standards in Android platform for performance improvements.
For Example, like an Effective Java code in J2EE environment is to defined the number of elements in the ArrayList constructor rather leaving it blank (new ArrayList(noOfRows)) etc. I definetly suspect these performance tuning tips should be available because of the memory and resource constraints.
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Oct 8, 2010
We have a desktop/web java application and also getting into Android development.Ideally we would like one app that runs both on desktop and android.From what we can tell, it's not much possible to run normal java apps on android. But wondering if it can do it the other way? That is, run android apps easily on the desktop (without the user install the sdk or android emulator)?In a prefect world we'd like one app for both platforms. Realistically though it seems like we're going to have to have one app with two front ends?
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Aug 18, 2009
Is it possible to evaluate a string of python code (or Perl) from Java when developing Android applications?
I am try to do something like evaluating a text-input script:
e.g.
CODE:...........
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Mar 31, 2010
I have a question.
I am developing android application on Linux platform because i have to make a system.img with a application.
When adding a drawable resource and building the project with mm command, i met a below error.code..
At above error, the icon_send_type is the added resource.
This error occurred because the mm command did not generate R.java.
So, i want to know how to generate R.java by a manual on Linux platform.
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Sep 6, 2010
I am using android:layout_marginTop="100dip" in my imageview,i want to set margin top to each image depending its height using coding not using xml,how can i set image's margintop?
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Sep 6, 2010
I'm currently developing a software under android and im getting quite quickly some OutOfMemoryException.... I did modified some part of my code to use more static variables instead of making new allocation with the "new" operator but is there any things else to do ? or any other tips ? Any advices would be welcome.
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Oct 16, 2009
I know Java apps can be run in Android. But what I want to know is this: I have a perfectly normal Java app and I want to port it to an android platform. What changes would I need to do to my app in terms of GUI and other code to make it usable in Android? I know Android uses XML file to control the look and feel of its app. So would I need to change my GUI completely? I just want to know the general overview of how porting may be done. If anyone could point me to right resources, that would be great. Also, for your info I'm a newbie to developing android app.
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Sep 27, 2010
I have an application I am writing for Android that basically does a screen scrape of a large table on the web and presents it in a nicer way on the handset. Its 500k of html and takes about 20 seconds or so normally.
When I have my phone hooked up to the computer, I used to be able to just click on "Run" and my code would execute similiarly speedy, as opposed to Debug where it would take 10 minutes to complete.
Now, however, clicking "run" behaves just like debug mode.... I don't want this overhead, how do I get eclipse to stop sending my app to the debugger already? I have searched online and found a couple people with the same issue, but simply rebooting my phone doesn't fix it, and there have been no other solutions posted that I have found.
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Oct 11, 2010
Been waiting for this as my iphone broke last month and I'm using a awful samsung now. Just stumbled across this article about the Desire HD and Desire Z not meeting google standards which is holding the phone up. HTC Desire HD, Z may face delay due to failed testing | Electronista
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Nov 22, 2010
As an experiment, I would like to use the platform key of my custom built Android platform to sign an arbitrary APK, that is built via the NDK. What is the process to go about doing this?
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Aug 20, 2010
There is a way to install Andriod on iPhone. But is there a way to install iOS4 on Andriod phones?
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Jun 21, 2010
I want develop on Android and iPhone...
How Platform can i use?
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Jan 13, 2010
Recently android have launch 2.1 version, so i just want to ask, can phone running on 1.6 version are upgradable to 2.1 version.
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Nov 24, 2010
I am interested in integrating Scala (or some other non-Java JVM-language) into the android platform. I am not referring to writing an android application with Scala, that I did early early on, but actually hooking into the build process that builds the android platform source tree. I imagine this will be a matter of hooking into the makefiles and such. Does anyone have insight into this?
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Aug 22, 2010
Is it possible to have an application open that allows you to send and receive video calls from people using Skype on their PC's, laptops, macs etc?
Using a front camera?
ie Galaxy S (in some places), or iPhone 4 (although I'm sure this would go against their policies..)
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Sep 2, 2010
I have a small doubt, Which is the best way to design UI for Android Coding or Desinging in XML? Which is better in performance?
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Nov 16, 2010
I'm a beginner android developer, and I've only been coding for a few months. I'm testing some layouts in a project using eclipse, and I'm following the guidelines from a textbook (beginning android 2.0) and I'm getting some rather perplexing errors. The first error is in my main.xml. my code is as follows:
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/ android" android:layout_width="fill_parent" android:layout_height="wrap_content" android:orientation="horizontal"
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Jul 19, 2010
I m really very fed up coding translate animation. actually my image is moving from one position to another but it is coming back to its actual position. can any body here provide me the code to move image from one position to another position without coming back.
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Jan 11, 2010
Let me first state that I do not know Java. I'm a .NET developer with solid C# skills, but I'm actually attempting to learn Java and the Android SDK at the same time (I know it's probably not ideal, but oh well, I'm adventurous :)) That said, my end goal is to write a streaming media player for Android that can accept Windows Media streams. I'm okay with restricting myself to Android 2.0 and greater if I need to. My current device is a Motorola Droid running Android 2.0.1. There is one online radio service I listen to religiously on my PC that only offers Windows Media streaming, and I'd like to transcode the stream so my Android device can play it.
Is such a thing possible? If so, would it be feasible (i.e., would it be too CPU intensive and kill the battery)? Should I be looking into doing this with the NDK in native code instead of Java? I'm not opposed to writing some sort of service in between that runs on a desktop computer (even in C#), but ideally I'd like to explore purely device-based options first. Where should I start?
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Apr 7, 2010
I keep hearing that Android applications should try to limit the number of objects created in order to reduce the workload on the garbage collector. It makes sense that you may not want to created massive numbers of objects to track on a limited memory footprint, for example on a traditional server application created 100,000 objects within a few seconds would not be unheard of.
The problem is how far should I take this? I've seen tons of examples of Android applications relying on static state in order supposedly "speed things up". Does increasing the number of instances that need to be garbage collected from dozens to hundreds really make that big of a difference? I can imagine changing my coding style to now created hundreds of thousands of objects like you might have on a full-blown Java-EE server but relying on a bunch of static state to (supposedly) reduce the number of objects to be garbage collected seems odd.
How much is it really necessary to change your coding style in order to create performance Android apps?
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Sep 6, 2010
<ImageView android:id="@+id/ImageView01"
android:layout_gravity="center_horizontal"
android:layout_marginTop="30dip"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:scaleType="fitCenter"
android:adjustViewBounds="true">
I want to set this property in coding for image view not use this,how can i make it?
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Apr 28, 2010
This is a recent install of the Android SDK. I just bought a Mac so even though I've previously done all my testing on a PC (and everything works fine there), I had to set up my mac for development. Installed latest version of Android SDK Installed Eclipse Helios and Android ADT. Now I really don't think this is a Helios or ADT issue since I can do all this without starting Eclipse at all using command line to start Emulator and using geo fix commands, and I get the same problem.
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May 26, 2009
After spending the better half of this day getting my HTC Magic to work in developer mode, I've now found that some of my frist openGL coding attempts that appeared to work fine in the emulator doesn't work as expected on the device. I've narrowed this down to glColorf(r, g, b, a) not working as expected on the device itself. The provided OpenGL samples do work though. So for example, after modifying Cube.java from the samples to the below code I find that I get the expected grey square on the emulator but a blank white screen (background fill colour) on the device.
class Cube { public Cube() { int one = 0x10000; int vertices[] = { -one, -one, -one, one, one, -one, one, one, };
// Buffers to be passed to gl*Pointer() functions // must be direct, i.e., they must be placed on the // native heap where the garbage collector cannot // move them. // // Buffers with multi-byte datatypes (e.g., short, int, float) // must have their byte order set to native order
ByteBuffer vbb = ByteBuffer.allocateDirect(vertices.length*4); vbb.order(ByteOrder.nativeOrder()); mVertexBuffer = vbb.asIntBuffer(); mVertexBuffer.put(vertices); mVertexBuffer.position(0); }
public void draw(GL10 gl) { gl.glFrontFace(GL10.GL_CW); gl.glVertexPointer(2, gl.GL_FIXED, 0, mVertexBuffer); gl.glColor4f(0.5f, 0.5f, 0.5f, 0.5f); gl.glDrawArrays(GL10.GL_TRIANGLE_STRIP, 0, 4); }
private IntBuffer mVertexBuffer;
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Aug 25, 2010
I want to clear sd card memory via android coding.
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Aug 1, 2010
I've got the hard-coded layout, consisting of buttons, and need to enlarge some of them. I found Button's method setWidth(int value), accepting width in pixels, but I need to set value in dp. So, how can I set dp value in program code?
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Mar 29, 2010
I already have experience with setting up virtual machines, running them and other minor tasks. Im a gamer, so I wont get rid of windows (for now at least...) but I do want to be a great programmer and to be involved with the Open-Source community Id like to know if its a good idea to do my programming in linux through a virtual machine, vs giving it a partitioned section of the HDD. Id like to know about performance pros and cons and functionality.The type of programming I intend to dive into : Android Dev, Web Dev, Desktop Dev...More Android and Web right now though. I do web designing as well, so dreamweaver is added as an "essential". But im sure I can do dreamweaver files and upload them to the server after programming in Linux...Right? And any info on IDE's in Linux for the above mentioned are appreciated, but i would prefer going the coding route and understanding the essence of whats happening "under the covers".
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Jul 22, 2009
How to connect and retrieve data from one webserver through coding in android application?
How to achieve this ? Give me sample code for this
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Oct 23, 2012
how to change the color text in my app. Default is white, not so good with a white background.
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Jul 7, 2012
Ways to implement H/W acceleration for video decoding(eg. H.264) in my own app for a long time, but got no clue.
I want to call H/W decoding based on NAL or frame level over raw bitstream, rather than setting up a media player for files.
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Jul 16, 2010
I am using Eclipse helios and android sdk r_06.But the phone where i am want to run my application has platform 1.6.how do make this application run on that phone with that platform because when i installed the application it gave me error "incompatible platform","package corrupted","package not found".how do i make it compatible?also in eclipse when i changed target name as "Android 1.5" it gave me error in res folder tellin "invalid resources directory"
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