Android :: Removing Public Static Fields In OS Environment?
Sep 20, 2010
Looking at the example code in the docs
http://developer.android.com/reference/android/content/Context.html#getExternalFilesDir%28java.lang.String%29
File path = getExternalFilesDir(Environment.DIRECTORY_PICTURES);
It does not compile on 2.1. The static fields DIRECTORY_PICTURES, DIRECTORY_MUSIC etc. Don't seem to be found. Using the filter api checkbox, I see that it was removed in Android 2.2 (or api version 8). So the manifest file needs to contain minSdk defined as 7.
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Oct 28, 2009
I frequently run into the problem that I have to preserve state between several invocations of an activity (i.e. going through several onCreate()/onDelete() cycles). Unfortunately, Android's support for doing that is really poor. As an easy way to preserve state, I thought that since the class is only loaded once by the class loader, that it would be safe to store temporary data that's shared between several instances of an activity in a static Bundle field. However, occasionally, when instance A creates the static bundle and stores data in it, then gets destroyed, and instance B tries to read from it, the static field is suddenly NULL. Doesn't that mean that the class had been removed and reloaded by the classloader while the activity was going through a create/destroy cycle? How else could a static field suddenly become NULL when it was referencing an object before?
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Mar 30, 2010
i want to display a msg to the user (msg box or Toast) when exception happend in a static SQLite Database class that i use. the problem is that i cant call a non static method in a static class , how can i handle this. this is the class
private static SQLiteDatabase getDatabase(Context aContext) {
and i want to add something like this in the class when exception happen but context generates the problem of reference to non static in static class.
Context context = getApplicationContext();
CharSequence text = "Hello toast!";
int duration = Toast.LENGTH_SHORT;
Toast toast = Toast.makeText(context, text, duration);
toast.show();
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Feb 7, 2010
I'm having some issues with the old "Cannot make a static reference to a non-static method" error in my Android program. I am creating a sand falling game (similar to the Powder Game) and I created a class called Control to create a Control Bar at the bottom of the screen with a slider for brush size (that works fine) and a button to pop up a Dialog to allow users to pick the selected element. However, when I call DemoActivity.showDialog(2) from my code, it gives the static reference to non-static error (DemoActivity is the main activity of my application). I also tried changing it to just Activity.showDialog(2), but I got exactly the same error!
Here's my code:
CODE:................
I fixed it by adding the following to my Control.java code:
CODE:..........
And then calling control.setActivity(this); from my onResume section of DemoActivity.java!
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May 26, 2010
I am modifying the source code here: http://thinkandroid.wordpress.com/2009/12/30/getting-response-body-of-httpresponse/
I get this error:
code:.............
This error is line 13 on the second box.
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Mar 18, 2013
I have Eclipse Juno and I'm working on an app with that.
The main activity will have a scrollable menu that takes you to all the other activities.
So the general structure/outline right now:[HIGH]Relative Layout ImageView (header logo type thing) ListView (the actual scrollable menu)[/HIGH]Here's the problem though... I can't find any simple list tutorials. I can easily make a single line list work but I need to make a two line list and one that is static, not dynamic and no examples are out there for that. It's like if you want to make a 2 line list, you can only learn how to do it in the most code-heavy ridiculous way possible.
Essentially what I am looking for with the list is this: Item one: Centred, bold, non selectable title (Resources)
- Item two-??: two line list items, click-able to a new activity, title of the section on first line, description on the second line.
- Item ??: Centred, bold, non selectable title (Tools)
- Item ??-??: two line list items, click-able to a new activity, title of the section on first line, description on the second line.
Nothing dynamic that is ever going to change, no super complex wonkey calculations, just to simply have the data set in stone (preferably via XML) and to call it into the list.
I experimented with some of the other list views and no matter what I did, I could get, via editing the resources and NOT using Java, more that one item on a single line but it wouldn't format it properly according to the layout I guess because I haven't got the ID correct or whatever I don't know.
I mean, all the examples I've seen for a 2 line list are extraordinarily over-coded and just bloated. I mean I have a website I am still working on in C#/ASP.net that has far more complex things in it with half the code that I've seen for the examples of the two line lists.
I tried on my own to figure it out (I am decent with C# and vaguely familiar with Java, self taught, and programming for some other systems like Python, again all self-taught), but like ALL coding references, they're organised by the actual code you implement (that you don't know) instead of by what you want it to do (so you have to search the whole code base to find something that you don't know what it's called but know what it does). >:C
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Mar 9, 2009
I have been finding it convenient to extend Handler in many of my activities to handle messages specific to the activity. The handler sublass is an inner class of the activity and needs to access its state. I am wondering if there is any performance difference between making the handler subclass static and passing in the activity explicitly in its constructor or making the subclass an "instance class" and letting the vm worry about my accessing members of the containing activity.
The static approach:
CODE:.............................
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Sep 15, 2010
Why should a static method in java accept only final or non final variables within its method, but not static?
For example I have the following method:
CODE:.................
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Jul 9, 2010
I'm the PC admin for a Public Library in Florida. I keep the labs running. I have NO experience with Android. We never have enough PC's for the public at peak times. Putting in more PC's is expensive, or even impossible in some buildings. I'm always looking for ways to serve more patrons cheaply. Portable PC's are an idea for getting around this, but have problems. Notably, some are going to get stolen. All of them will get used heavily and often by people without the necessary skills to keep their data private. Sometimes they get used by our young hacking community for naughty things. I saw the Cherrypal PC and got interested. These things are ultra-cheap. That's enticing.
So here's my big question: How do I lock down an Android public PC? Specifically I need the machine to boot or log to a state that's exactly what I want EVERY time a new user comes on. There can be no remaining information about the old user (credit cards, passwords, chat history, etc.) that the next user can steal. Can I lock down the PC's? Is it easy and fast to restore to a base state that has the homepage and appearance that I want for the library, while keeping away changes I don't want? Is there anything that would keep Android from being a good addition to public PC's in the library?
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Aug 31, 2009
When I download the source and build it according to http://source.android.com/download, then try to build the eclipse dev evironment as described on http://source.android.com/using-eclipse, I get 100s of Java Errors when trying to build the project.
Linux is 2.6.28-15-generic #49-Ubuntu Eclipse is eclipse-java-galileo-linux-gtk.tar.gz
18# java -version java version "1.5.0_18" Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_18-b02) Java HotSpot(TM) Client VM (build 1.5.0_18-b02, mixed mode, sharing) 19#
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Oct 20, 2009
I'm currently working on an application which need security features. My question is simple, if every application is signed by its developper, how can I access application public key? (and private).
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Apr 21, 2010
I have this code:
hubSpinner.setOnItemSelectedListener(new OnItemSelectedListener() {
public void onItemSelected(AdapterView<?> parentView,
View selectedItemView, int position, long id) {
final MediaPlayer mp2 = MediaPlayer.create(Textbox.this, R.raw.hero);
mp2.start(); } public void onNothingSelected(AdapterView<?> parentView) {
} } );
(The code basically runs when a new item is selected of a spinner and then plays a song, which later will be a variable based on what was picked, but I'm fine as it is for now). And I want to be able to use 'mp2' out of this public void, (I want a button which pauses it). How can I do this?
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Nov 10, 2010
iFMW was upgraded: Mobile site for public person or private file share for secret person in one app.
It has two inversion functions on one app.
Public person can get his/her own public web site on the phone and secret person can use only private file sharing directly on the phone without uploading.
Those who want two demands above will use whole functions.
What will you choose of those choices?
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Oct 4, 2009
I'd like to use python scripts as plugins for an app I'm developing. This seems to be possible by interacting with android-scripting-environment (ASE), as is done by Locale, but I haven't found any documentation about this. How you execute ASE scripts from your own app?
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Sep 17, 2010
For now I've used the classic export command to set an environment variable and tried to read this variable from my test with System.getenv() function, but it doesn't seem to work. how to set and read a system variable in an Android application?
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Nov 2, 2010
I am try to get the android environment setup for phone gap and I keep getting this
error when I try and create the phonegap project.
CODE:...............
I have got through the setup for the last could of days. I have also check the PATH for the android sdks and built the test android app in eclipse.
There are the path in the environment vars
CODE:...................
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Jun 26, 2010
If it's sunny outside, I can't see anything on the screen of my Android device (HTC Desire). Do you have any solution to this?
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Oct 14, 2010
I was just wondering if there was an Android environment that would let you run Android OS inside/alongside Windows, like Virtual PC basically, and let you have full connectivity just like if you were using your phone. I'm not sure what the utility could be right now but it sounds interesting to me.
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Feb 29, 2012
Today i installed nano on my android device. it works but i have to set the following variables manually in the terminal emulator:
Code:
export=TERMINFO=/system/etc/terminfo
and
Code:
export TERM=linux
is it possible to set this variables automatically when the phone is booting?
Android Version 2.3.4
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Jun 2, 2010
How to do RSA encryption of byte array with base-64 encoded public key?
After reading the couple of articles( of google search ) on how to do RSA encryption in Java, found the following snippet.
CODE:.........
I have public key as a base64 encoded string (126 characters), How do i create 'PublicKey' with the encoded string and use it with Cipher.
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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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Aug 18, 2010
I am using a Mac with Eclipse Galileo, trying to load Android code from a public repository. I tried 'Checkout from SVN' and the URL is:
http://secrets-for-android.googlecode.com/svn/trunk/secrets-for-android-read-only
This is from the website:
http://code.google.com/p/secrets-for-android/source/checkout
I get the error:
Error validating location: "org.tigris.subversion.javahl.ClientException: Bad URL passed to RA layer
svn: URL 'http://secrets-for-android.googlecode.com/svn/trunk/secrets-for-android-read-only' non-existent in revision 114"
Keep location anyway?
I'm currently using this svn client in Eclipse to manage my own secure repository on another website, so I know it's installed correctly and works.
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Oct 19, 2009
Buster is now available in the Android Market.When is my bus? Start Buster, and you'll instantly know just when your bus will arrive at your stop. Uses your phone's location sense to find your stop and your buses.Currently in free Beta, Buster supports the metropolitan transportation networks of Austin, Denver, and Sacramento. More cities and features coming soon. We'd love your feedback here or at support-at-n9works.com. Also, we're trying to get a sense which cities to roll out into following the beta cities.
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Apr 20, 2010
I'm a bit new to programming Android App's, however I have come across a problem, I can't find a way to make global variables -unlike other coding like php or VB.NET, are global variables possible? If not can someone find a way (and if possible implement the way into the code I will provide below) to get a value from the variable 'songtoplay' so I can use in another Public Void...
Here is the code:.............
Basically, it gets the value from the Spinner 'hubSpinner' and displays it in a Toast. I then want it to return a value for string variable 'songtoplay' -or find a way to make it global or useable in another Public Void, (Which is will a button, -loading the song to be played)
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Feb 17, 2010
I've just started debugging my first three line long android app and I can't seem to use the debug tool like I want to. Here's my code:
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
int a = 1 / 0;
}
Now I expect the debugger to halt the thread and show me the line number of statement where the division by zero occurs. No, instead it shows some other method internal to the system for which I have no source. To make the matters worse, there is no exception message either. Prior to this app, I created one which would do something when a button was pressed. If any exception was raised, again no useful line number or exception message would be shown. As of right now, there is no way to debug my app. I'm using the latest SDK along with Eclipse ADT plugin and debugging on a real device (Nexus One).
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Oct 13, 2009
I'm trying to make my app scriptable. Specifically, I need to expose a few Java APIs and make callbacks settable via user-written scripts. Ideally I'd like to hide some of the complexity away in a DSL, but there's no way of accomplishing what I want neatly without some form of user scripting, so I may accept another alternative if it meets my requirements. Initially I looked into Scala as that is my main language of choice, but the Scala interpreter is just a wrapper around its compiler, which I'm told won't run well if at all on the phone.
I've also tried JRuby, which worked under Cupcake. There appears to be a regression in the form of a Dalvik bug that prevents it from working under Donut, however:
http://code.google.com/p/android/issues/detail?id=4242
I've also seen the Android Scripting Environment. Am I correct in assuming that this only supports running full interpreters and not embedding scripting languages into apps?
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May 21, 2010
How to add additional font in android environment? I need to make a font like LCD with pale background numbers like this:
http://www.androidfreeware.net/img2/gps_speedometer_android_1.png
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Dec 3, 2009
I need to implement JNI Programming in android environment. SO if anybody knows about JNI programming in android.please let me know or if you found any useful links or information about this concept please send me .
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Jun 9, 2009
Reading the sensor API (http://developer.android.com/reference/android/ hardware/SensorManager.html) The section about ACCURACY speak about calibration:
"calibration with the environment is needed"
How do it calibrate?! Is this software calibration? Phone specific calibration??
I don't see any methods to calibrate.
Using the HTC Magic the compass often give me crazy values like if I was on the magnetic pole. I feel pretty scared and hide under a tinfoil hat just in case...
So any url, doc or explanation!
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Sep 20, 2010
I would like to use self defined Environment variables in my source code.
I use System.getenv() to do this and the code line looks like this. Log.d("MyTest","== MyEnv " + System.getenv("AP") + " ANDROID_ASSETS:" + System.getenv("ANDROID_ASSETS"));
Before I execute my code I define my AP variable with export: export AP="12345" and the this is my output of set command
ANDROID_ASSETS=/system/app
ANDROID_BOOTLOGO=1
ANDROID_DATA=/data
ANDROID_PROPERTY_WORKSPACE=9,32768
ANDROID_ROOT=/system
AP=12345
Then I execute my code and I get this line from logcat
D/MyTest( 5363): == MyEnv null ANDROID_ASSETS:/system/app
The value for my defined Environment variable is null. Any suggestions on why it didn't work?
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