How To Build A Basic Android Application
Oct 3, 2011
I am a complete novice to the field of Android applications. I want to build a basic Android application of an "website alert and post service".
Eg: Lets take FACEBOOK or TWITTER as the website.The application which I design should intimate me about the new posts or tweets of my friends. At the same time I must be able to post or tweet just by opening a text box in the application and writing in it. As soon as I write, the message should get posted or tweeted on the website.
I am not sure about the complexity of the above application but I feel this would reduce the trouble of opening a browser, typing the website name and then logging in by putting the username and password.
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Jul 6, 2010
I have been trying to code and run the hello world application but am not able to get the emulator to boot all the way. Plan b is vb.
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Apr 28, 2009
I have created a web application in ruby on rails and I want to use it now in my android application. I use http basic authentication in my website but I don't get any success to authenticate me trough the android application..
I have protected resources and pages on the website that needs authentication to access it! How can I get this right in my application?
How can i do the authentication? i have tried with a arthroscope and BasicCredentialsProvider but i think i am not doing it good! Can someone help me!
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Aug 26, 2010
First and foremost, are there many android developers here? Is this a good place for Android related discussions?I seem to be missing a rather large concept of Android development. The gist is I am struggling understanding how to tie an application together. I'm not sure how to explain it, so I thought I would do my best with an example from the Android ApiDemo... assuming you are familiar with it.
Inside the com.example.android.apis.view namespace of the ApiDemo, there is a class called Animation3.java.Animation3 inherits the activity class and there is some code inside to display animation.I can't find a reference to the class (Animation3) anywhere in the demo code (except for its definition obviously). The only mention I found is in the manifest xml file. So how the heck does this activity get started? Don't we need to create an instance of the class somewhere and fire off a method to start it? I don't understand how to generate the code that ultimately glues this class to the rest of the application.Additionally, what about other classes like views or viewgroups? How do I generate code outside the class that initiates/starts/uses/calls (insert proper term) the class.I would appreciate any code examples as well as any concept explanation or reference documents. So far I've read pages and pages on activities and views but I'm really struggling how to tie things together.
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Feb 27, 2009
I am coding a basic android application that has to call a web service, using KSOAP2, I am sending a request with one parameter (city) and need to get the response of the web service (basically a short String) from this site:
http://www.deeptraining.com/webservices/weather.asmx?op=GetWeather
When execultin the application, I only get a message: "This application has stopped unexpectedly". When debugging, I am getting the following error:
Thread [<3> main] (Suspended (exception VerifyError) And: ViewRoot.handleMessage(Message) line: 1198 that says: Source not Found And shows a button allowing to: Edit Source Lookup path. What does this basically mean?
My source code that generates the is the following:
private static final String SoapAction = "http://www.deeptraining.com/ webservices/GetWeather"; private static final String MethodName = "GetWeather"; private static final String Namespace = "http://www.deeptraining.com/ webservices/"; private static final String URL = "http://www.deeptraining.com/ webservices/weather.asmx";
And the main part of it: SoapObject request = new SoapObject(Namespace, MethodName); request.addProperty("City", cityname); SoapSerializationEnvelope envelope = new SoapSerializationEnvelope (SoapEnvelope.VER11); envelope.setOutputSoapObject(request); HttpTransport androidHttpTransport = new HttpTransport(URL); try { Result.setText("... Processing ..."); //error here: androidHttpTransport.call(SoapAction, envelope); ...
I am using Eclipse with Android plugin and KSOAP2 library.
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Apr 6, 2010
I'm starting to get into networking on android and I was wondering what the requirements are to setup a simple messaging application. Do I need to host a central server somewhere to have two people connect to in order to receive messages? Are there any examples on how to go about doing this?
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Jan 16, 2010
I'm trying to create a basic sample Stop Watch type application which basically displays a timer. It can then be stopped and started. I'm using the mUpdateTimeTask to do this. However my app just crashed when I run it.
publicclass TimeWatch extends Activity {
/** Called when the activity is first created. */
private Button btnStart;
[Code]....
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Aug 20, 2010
im pretty new at Ant and have been looking for alot of examples. I am pretty far now, and was successfull to get a build.xml going. Though i seem to have one thing missing. My application needs a custom Reference Library i am calling that is a jar file. But i dont know how to add it one.
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Feb 18, 2010
How can I build a pie chart in my application?
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Jul 7, 2010
My goal is to modify the Launcher application and dynamic modify and change theme,I saw several 'home' apps as http://www.cyrket.com/p/android/com.stain46.taghome/ ,it looks like they took the default Home(Launcher) and modify it. The only thing I'm wondering is how they did that? usually what thing i need to modify in Launcher folder,because i donot know where to try ,thank you for your reply.
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Jul 29, 2010
I'm working on an app that is meant to be used by fans of a sport team. In the future, I expect to use the same app but for any different team. So, what changes would be the colors, team logo, app name and the like. So, is there any technique that allows me to build binaries for different teams without having duplicated resources?
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May 4, 2010
I need to build compass for my application.
From reading the documentation it seems there are two reasonable ways of doing this:
Sensor.TYPE_ORIENTATION method: This is the easy way of doing it. The problem with this is it is not accurate. When I compare my reading with Snaptic Compass it is about 10-15 degress off which for my purposes is unacceptable.
Sensor.TYPE_ACCELEROMETER, Sensor.TYPE_MAGNETIC_FIELD and getRotationMatrix() in conjunction with remapCoordinateSystem() and getOrientation() method: The documentation says this "is usually more accurate". The problem is regardless of the delay I register with listener the compass goes crazy even when the device is stationary on flat surface.
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Jul 5, 2010
I'm trying to get android running on a gumstix overo system.
since i'm not planning to use the final "product" as a phone, i asked my self if it is possible to exclude applications like the phone/dialer-app from the kernel build-process (any config parameter probably?)=
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Sep 26, 2009
Has anyone got the WikiNote from
http://code.google.com/p/apps-for-android/
What I did was:
1) Checkedout the project via apps-for-android instructions
[svn checkout http://apps-for-android.googlecode.com/svn/trunk/ apps-for-android-read-only]
2) Opened a new Android project using existing source dir [per the WikiNote direction]
3) Cleaned the project and let it rebuild
It won't build the APK though and reports compilation errors (the top level dir is flagged red in eclipse but nothing else is so I can't track down where the error supposedly is)
Java Model Exception: Java Model Status [gen [in WikiNotes] does not exist] at org.eclipse.jdt.internal.core.JavaElement.newJavaModelException(JavaElement.java:502) at org.eclipse.jdt.internal.core.Openable.generateInfos(Openable.java:246) at org.eclipse.jdt.internal.core.JavaElement.openWhenClosed(JavaElement.java:515) at org.eclipse.jdt.internal.core.JavaElement.getElementInfo(JavaElement.java:252) at org.eclipse.jdt.internal.core.JavaElement.getElementInfo(JavaElement.java:238) at org.eclipse.jdt.internal.core.PackageFragmentRoot.getKind(PackageFragmentRoot.java:477) at org.eclipse.jdt.internal.ui.packageview.PackageExplorerContentProvider.processDelta(PackageExplorerContentProvider.java:645) at org.eclipse.jdt.internal.ui.packageview.PackageExplorerContentProvider.handleAffectedChildren(PackageExplorerContentProvider.java:791) at org.eclipse.jdt.internal.ui.packageview.PackageExplorerContentProvider.processDelta(PackageExplorerContentProvider.java:734) at org.eclipse.jdt.internal.ui.packageview.PackageExplorerContentProvider.hand leAffectedChildren(PackageExplorerContentProvider.java:791) at org.eclipse.jdt.internal.ui.packageview.PackageExplorerContentProvider.processDelta(PackageExplorerContentProvider.java:734) at org.eclipse.jdt.internal.ui.packageview.PackageExplorerContentProvider.elementChanged(PackageExplorerContentProvider.java:124) at org.eclipse.jdt.internal.core.DeltaProcessor$3.run(DeltaProcessor.java:1557) at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) at org.eclipse.jdt.internal.core.DeltaProcessor.notifyListeners(DeltaProcessor.java:1547) at org.eclipse.jdt.internal.core.DeltaProcessor.firePostChangeDelta(DeltaProcessor.java:1381 at org.eclipse.jdt.internal.core.DeltaProcessor.fire(DeltaProcessor.java:1357) at org.eclipse.jdt.internal.core.DeltaProcessor.resourceChanged(DeltaProcessor.java:1958) at org.eclipse.jdt.internal.core.DeltaProcessingState.resourceChanged(DeltaProcessingState.java:470) at org.eclipse.core.internal.events.NotificationManager$2.run(NotificationManager.java:291)at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) at org.eclipse.core.internal.events.NotificationManager.notify(NotificationManager.java:285) at org.eclipse.core.internal.events.NotificationManager.broadcastChanges(NotificationManager.java:149) at org.eclipse.core.internal.resources.Workspace.broadcastPostChange(Workspace.java:313) at org.eclipse.core.internal.resources.Workspace.endOperation(Workspace.java:1022) at org.eclipse.core.internal.resources.InternalWorkspaceJob.run(InternalWorkspaceJob.java:45 at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)
eclipse.buildId=I20090611-1540 java.version=1.5.0_20 java.vendor=Apple Inc.
BootLoader constants: OS=macosx, ARCH=x86, WS=cocoa, NL=en_US Framework arguments: -product org.eclipse.epp.package.jee.product -keyring /Users/me/.eclipse_keyring -showlocation Command-line arguments: -os macosx -ws cocoa -arch x86 -product org.eclipse.epp.package.jee.product -keyring /me/.eclipse_keyring -showlocation
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Jun 1, 2010
I am currently finding about how to build a XMPP client application on android 2.1.I came across this link which somewhat talks about the same problem.I am a newbie to android dev and thus found the solution given there to be difficult to digest.
The system currently has Active MQ as a JMS provider.My job is to fed the messages coming from JMS to the XMPP server and then develope XMPP client on android 2.1 which will listen and show notification to the events pushed by the server. I have following concerns(which might sound foolish)
1.How do I push the events from JMS to the XMPP server which will in turn push them on android?
2.Which XMPP server implementation I should use?I have 3 options....................
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Nov 12, 2010
We are developing a software suite that heavily involves user interaction. We'd like to have a nice touch-based user interface, very similar to that of Android. Are there any libraries or other ways to easily build and use such user interfaces for own applications. We mainly develop in C++, but things in Python or Java or even something web-based..
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Feb 9, 2010
I am trying to write test cases for "phone" native application , so i am trying to build that application from the source code...
It has some dependency with the Contacts app , i am not able to resolve that.
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Jun 24, 2010
I downloaded the Android 2.2 source code and try to build it. When I executed the make command, I got an error here like this build/core/java.mk:20: *** frameworks/ex/common: Invalid LOCAL_SDK_VERSION '8' Choices are: current 4 5 6 7. Stop. Then I changed the frameworks/ex/common/Android.mk to LOCAL_SDK_VERSION = 8 from LOCAL_SDK_VERSION = 7. Next place, build/core/java.mk:20: *** external/jsr305: Invalid LOCAL_SDK_VERSION '8' Choices are: current 4 5 6 7. Stop. I changed the external/jsr305/Android.mk to LOCAL_SDK_VERSION = 8 from LOCAL_SDK_VERSION = 7
Last one, build/core/java.mk:20: *** external/guava: Invalid LOCAL_SDK_VERSION '8' Choices are: current 4 5 6 7. Stop. I changed the external/guava/Android.mk to LOCAL_SDK_VERSION = 8 from LOCAL_SDK_VERSION = 7
By these changes the code started the compilation.
1. Why the error occured?
2. Changes which I did is correct or not?
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Aug 27, 2010
I doubt there are too many people who run CDT in eclipse for native apps also with ADT installed for Android, but in the off-chance that someone here knows anything about this, my problem is that any time I run any android app, my C builder kicks in for projects totally unrelated. I have no idea why and have been digging through settings on everything, unable to find out why. All I can think is that the ADT pre-launch process triggers it via a refresh or some kind of catch- all type call in eclipse API land that I'm unaware of. Does anyone know anything about this? It's very annoying to have a C builder run for a different project than the one you're working on every time you launch the app.
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Mar 7, 2010
I'm trying to build a radio application for Android.I'm an android newbie,but familiar with Java.Could anyone tell me the procedure for streaming audio from an internet radio station onto my android device in detail?
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Feb 21, 2013
I have a phone with a MT6577. The vendor (Wiko) published the kernel source code. So, i'm trying to build it. I can get the zImage. I converted it to boot.img but i can't boot with it on my phone.build a good zImage? (if you want to try) : URL...
cp mediatek-configs .config
TARGET_PRODUCT=s9081 MTK_ROOT_CUSTOM=../mediatek/custom make
# sudo mtk-tools/repack-MT65xx.pl -boot zImage boot.img-ramdisk boot.img
MTK-Tools by Bruno MartinsMT65xx repack script (last update: 27-01-2013)
Repacking boot image...
Ramdisk size: 2046 blocs
Repacked boot image into 'boot.img'.
Here are the Warnings I got when compiling
mediatek/platform/mt6577/kernel/drivers/video/tvc_drv.c:61:5: warning: "FIXED_WVGA_PARAMS" is not defined
net/ipv4/tcp.c: In function 'tcp_nuke_addr':
include/net/ipv6.h:338: warning: 'in6' may be used uninitialized in this function
net/ipv4/tcp.c:3367: note: 'in6' was declared here
In file included from net/ipv4/netfilter/ipt_LOG.c:27:
include/net/netfilter/xt_log.h: In function 'sb_close':
[code]....
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Nov 1, 2010
what is a kernel? I'm just lookin for a basic definition.
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Jan 24, 2010
We already use Android API. But sometimes I want to know is it verified or not? by whom?(e.g. Android team in google) by which one? (e.g. Unit test or Basic Acceptance Test for API) Do android team have any test report? Because this is a platform for smartphone. For example, if there has any problem in Android API (e.g. Date and Time), it makes customer spend money and time more. But I can't find any report about verifying API test. If you have any information about it, please let me know :) Also if there has no information, how can I test some API to verify API.
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Jun 29, 2010
I'm having great difficulty getting basic textures to work in an OpenGL ES app on my Droid (2.1-update1). I trying to render a simple textured quad - four vertices, two faces, with normals and texture coords. When rendered, the texture is garbled and full of static, similar to TV noise. The basic colors from the texture map are there, but obviously the texture isn't being read or applied correctly. My texture load sequence is simple : int[] textures = new int[1]; gl.glGenTextures(1, textures, 0); Bitmap bmp = BitmapFactory.decodeResource(cx.getResources(), R.drawable.img); gl.glBindTexture(GL10.GL_TEXTURE_2D, textures[0]); GLUtils.texImage2D(GL10.GL_TEXTURE_2D, 0, bmp, 0);...
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Apr 5, 2010
I have a Web View. I'd like to show some page from my server, but I require some basic authentication. Is there a way I can specify basic auth credentials when calling Web View.load Data() somehow? I can do this on i phone with the equivalent web view class, thinking maybe same is possible with android?
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Aug 16, 2010
I have the following layout in XML (splashscreen.xml):
CODE:............
When I try to execute it in Android 1.5 (executes correctly in all other versions) I get these errors:
CODE:.............
Line 5 corresponds to ImageView line. Do you have any idea why my program executes in all Android versions except 1.5?
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May 8, 2010
I am new to android and last year i bought two books of android 1.5. But at that time i was busy in my project so was not able to work on android. Now i want to start android again. Should i go for those books or should i buy new editions. Is there any major change regarding basic learning? My question is purely related to change in version.
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Jun 5, 2009
I routinely use my g1's browser to connect to a website that is protected with basic authentication (so you get the popup for username and password). Ever since updating to cupcake, my phone seems incapable or unwilling to correctly use / remember my passwords. It's driving me crazy, and I'm ready to chuck the thing out the window, or at least revert to the previous version. Has anyone else experienced this problem?
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Oct 13, 2009
I have a WebView in my layout which I want to display a web page in. However the webpage requires Basic Authentication.
If I try to access this web page in the normal android browser, I get prompted for a username and password which then gets remembered and works for the site in future.
I want to do the same thing in my application, but when I load the page into the webview it just comes straigt up with the Unauthorized message without prompting.
I guess the prompting for Authentication is written in code in the android browser. Does anyone know how to inject a username and password into the WebView?
I have done a search arond and found the setHttpAuthUsernamePassword (String host, String realm, String username, String password) Method, But can't seem to get it to work and I can't find anyone else who has either? Not sure if I am giving it the correct parameters as I'm a little confused by what is means as the Realm?
I assumed that if the site was myhost.dyndns.org then the hostname would be myhost and the realm would be dyndns.org? This didn't seem to work. I also tried connecting by IP Address but that makes the Realm setting even more confusing? Any ideas on how I can get this working?
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May 28, 2010
I'm new to programming applications for the Android OS. As far as general architecture of the OS goes, I understand that processes are implemented as Linux processes and that each one is sandboxed.
However, I'm utterly confused on the IPCs and syscalls (if any) used. I know that the IBinder is a form of this; parcels are sent back and forth between processes and Bundles are array forms of parcels (?). But even that is still unfamiliar to me. Same with Intents. All in all, I don't understand what kinds of IPCs are implemented and how.
Could someone briefly explain to me the specific methods used by user level applications in Android OS to communicate with each other and the OS? I've done kernel programming and played with various IPCs in Linux (Ubuntu and Debian) so it would help immensely if this was all explained in relation to what I'm familiar with...
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