Android :: Need To Use Static Variables In Droid

Mar 19, 2010

In android, are using static variables a recommended practice?
E.g, implementing a Singleton pattern in Java, I usually do...

Also, when does this get cleaned up by the Android JVM?

Android :: Need to Use static variables in droid


Android :: Alternatives To Static Variables In Droid?

Jun 17, 2010

I am using static Arrays and HashMaps to store some values in my AppWidgetProvider class. But they are becoming null when the process dies, so the widget does not work anymore. Are there any alternatives to using static members to store data for an AppWidgetProvider in Android?

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Android :: Activity Lifecycle And Static Variables

Jul 14, 2009

I just ran into a situation where it looks like a static variable reference is persisted across activity sessions. I didn't expect that because I thought that when an activity exits, it's de-referenced and garbage collected. I am wondering if anyone can shed some (more) light on when the VM eliminates object references for Activities and Services and in particular when static variables get reset to default values?

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Android :: All Static’s Variables Retaining Values When Launching Again

Dec 1, 2009

I have been facing problems to manage statics variables used in my android application. If we exit the application against a particular event (touch or key event -which is must for my app), all the statics variables are retaining the values when I am launching it again. I am invoking Activity.finish() method for termination . I know there is a collection type class available called Bundle and we can use it to save the states of all the statics and get those back when again creating the same activity during relaunch, but it would be a hard task if we want to port some j2me applications to Android because of having thousands of statics variables. Is there any way to kill the application completely including all the statics variable used there?

I tried with System.exit(0) and it works well for Android G1 and G2 (tested in firmware 1.6). But in Android Robyn (prototype) the same causes a major defect ("Activity not responding" popup apears just after exit) and I came to know from android dev forum that calling System.exit(0) is not recommended for termination of an activity.

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Android :: Parsing XML And Initializing Static Variables Of Some Class

Dec 21, 2009

I have an application that is driven by a configuration XML: various app properties are loaded at the app start-time by parsing the XML and initializing static variables of some class. The data read from this XML drives different Activities of the application. Presently, I have called the "parsing and the properties-initialization" from the onCreate() of my Main Activity. I have a few questions as regards this case/approach: Should I invoke the app initialization method from the Application Object or is the current approach correct?

What advantages/disadvantages do/would we get/have if I choose to invoke it from the Application object? Do we really need a static class to store app properties? Or can we have all the properties as a static Collection variable in the application object? Parsing a XML(~200 nodes) at app load time might take some time (not sure how long tho); How can I avoid the dreaded ANRs? I am using a Pull Parser.

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Android :: Static Method In Java Accept Only Final Or Non Final Variables Within Its Method - But Not Static

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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Android :: Static Variables Of An ApplicationContext Subclass Left Untouched When The Process Is Killed?

Sep 7, 2010

Do static variables of an ApplicationContext subclass left untouched when the process is killed?

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Android :: Call Non Static Method In Static SQLiteDatabase Class

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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Android :: Cannot Make Static Reference To Anon-static Method

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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Android :: Non-static Method Cannot Be Referenced From A Static Context

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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Replace Single Row View In Custom STATIC ListView - STATIC Data

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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Android :: Why I Can't Access Protected Member Variables In Droid Classes?

Jun 18, 2009

When I extend a View, I cannot access the protected member variables from my code. Eclipse just says that there exists no variable with that name (for instance mScrollX). Why is that?

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Android :: Static Vs Non-static Inner Classes

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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Android :: Most Of Droid Tutorial's Variables Start With M / Is This A Java Thing - Stand For Mobile?

Jan 19, 2010

I know about camel case rules, but I'm confused with this m rule. What does it stand for? I'm a php developer, "we" use first letters of variables as indication of type, like 'b' for boolean, 'i' for integer and so on.

Is 'm' a java thing? Does it stand for mobile? mixed?

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Android :: Way To Create A C++ Static Lib To Use With Java On Droid?

Apr 27, 2010

I have some C++ code that I want to make into a static lib for use with Java on the Android platform. Can anyone point me to a resource that tells me how to do this? I am completely new to Java and Android.

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Android :: How To Compile Droid App With Static Library

Apr 2, 2009

How to compile android app with static library?could somebody give me a example?

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Android :: Setup Background Of Layout Being Static In Droid

Sep 4, 2010

I have view to show the content alone have to scroll in the view on the layout.how to scroll the content alone not the whole layout.

Here my layout code for content details....

how can set static background for whole view.

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Android :: Droid-ndk : Difference Between Static And Shared Library?

Jul 9, 2010

I'm new to Android ndk and i didn't understand yet which are the differences between static and shared library. Could you explain me what these differences are? When developing a library how could i choose one of them?

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Android :: How To Make Variables Global?

Mar 28, 2009

Can anyone hep me with how to make a (boolean) variable global in Android?

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Android :: Pass Variables To An Outside Class?

Aug 12, 2010

I split my inner View class from my Main class into its own file. In my main class, I have the view set as an onTouchListener which records user movement into a matrix so it can translate and scale the view. After separating it everything works but im unsure how to pass the matrix to the View for onDraw to update. Any suggestions?

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Android : Change Variables From Different Classes?

Jun 6, 2010

Before I delve into it, I'm very new to Android and I have just started learning Java last month. I've hit bumps while trying to develop my first simple app. Most of these hurdles were jumped thanks to random tutorials online. MY CODE IS VERY MESSY. Any tips are appreciated.

The question above is quite broad, but this is what I want to do: It's a essentially a blood alcohol content calculator / drink keeper-tracker. Basic layout: http://i.imgur.com/JGuh7.jpg

The buttons along the bottom are just regular buttons, not ImageButtons (had problems with that) Here's some example code ..

It outputs the following to the text view: "Your BAC is -0.017". This is the Bac value for if StandardDrinks was still 0, so obviously there is some problem communicating between the classes.

The other elements of the formula (weight, time spent drinking, and the alcohol %'s and such) are variables because I will ultimately allow the user to change those values in the settings.

I've heard around the water cooler that global variables are not good programming style, but this is the closest I've come to getting it to work..

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Android :: Developing C++ Static Library For Use With Java On Droid / Start It?

Apr 27, 2010

I have an existing C++ library that I want to compile into a static library, and call commands from it with Java on the Android platform. I am brand new to Android development, and just need to figure out how to set the Java interface up so my C++ lib works on the Android. Where do I start?

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Android :: Compile Static Library Using Droid NDK / Getting Error - Get It To Work?

May 31, 2010

I'm trying to compile a static library to use on Android but I can't figure out how to compile it. The library uses standard libraries (stdio.h etc...) and libxml2.

I am trying to compile using arm-eabi-gcc but I get the following error:

/cygdrive/c/android-ndk-r4/build/platforms/android-8/arch-x86/usr/include/asm/posix_types.h:15:28: error: posix_types_64.h: No such file or directory

How do I get this to work?

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Android :: Make Variables And Multiple Activities?

Oct 12, 2010

How can I make a variable or object available to multiple activities or restarts of the same one.

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Android :: Get Variables / Data From One Screen To Another In Phone?

Feb 27, 2010

In android: I'm trying to take data from one activity/screen to another.

Let's say I'm adding two numbers. I layout my first screen (xml) with 2 EditText views, a couple labels, and an 'OK' button. Now, I want to add the numbers that I've input into the EditText views. Let's say I input 2 and 2 (2 + 2 = 4).

Now, when I hit the 'OK' button, I want a new screen/activity to appear and simply show me the answer (4). Do I use global vars to do this?

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Android :: Threads Cache Instance Variables?

Jul 3, 2010

I am starting to develop an Android App and have noticed the following behaviour in my test code (not yet designed the real app):

A thread that loops around doing Bluetooth IO accesses an instance variable that is declared in the enclosing class. That instance variable gets set to null by the GUI thread in the onBackPressed() method which also closes the Bluetooth socket which causes an exception in the IO thread (which is what I want).

The odd thing is that if I set the instance variable to null before I close the socket, the IO thread sees the null value, but if I close the socket first and then set the variable to null, the IO thread doesn't see the null value.

The instance variable is being used in a loop in the IO thread and it appears as if that variable is being cached while within the loop. So any changes to that variable by another thread are not visible. Is that possible? If so, is there a workaround to guarantee that the VM will read the value of the instance variable?

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Android :: Get User Defined Environment Variables?

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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Android :: Create Executable Static Library In Droid / Connect It In Eclipse?

Feb 19, 2010

I ask something about static library..

" how to create executable static library in android?"

and

"How to connect static library in eclipse?"

Static library is a binary file, How to understand static library in jni?

I wondering static library operation method in android.. (such as static library in vc++).

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Android :: Make Droid Library For Static Linking That Includes Resources?

Mar 7, 2010

I am successfully linking some of my code stored in a .jar-based library to my Android app. The .jar code references Android library content just fine.

The problem is I need to include 'res' resources in the library but can't work out how to do this. Any suggestions?

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Android :: Development Mode And Maintaining Environment Variables

Nov 16, 2009

I'm building an Android application and would like to maintain a few environment variables that I can tweak depending on whether I'm in development mode or release mode. For example, I need to invoke a web service and the URL will be slightly different in either mode. I'd like to externalize this and other settings so I can change them easily based on my target deployment. Distinguishing development mode and release mode environment settings on Android. Are there any best practices or anything in the SDK to assist with this need?

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