Android :: Pitfalls When Using Static Functions?

Sep 30, 2010

I use in the getView()-Method of this example a static function to download the source of an ImageView. Later there will be threading included. However, I like to know in general how save the use of static function is in this case.

Because I experienced, that in some cases (when I scroll really fast) the Images get mixed up.code...

Android :: Pitfalls when using static functions?


Android :: Preventing Functions From Being Stripped From Static Library

Aug 23, 2010

I have a static library, Foo, that is used by a shared library, Bar. Bar is the native shared library loaded by my Android app. Foo contains JNI functions that are only called by Java code and not by any C++ code in Bar. Because of this, those JNI functions get stripped out of the static library (Foo) when the shared library (Bar) is built. I'm currently using a slightly hacky method to prevent that from happening.So, in this case, is there a way to tell the compiler to not strip the JNI (or any) functions out when linking?

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Android :: Pitfalls To Remember While Programming For Droid?

Aug 24, 2009

Are there pitfalls or the points to remember while programming for Android? I think the list will include topics on Multithreading, Persistent Storage, etc.

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Android :: Common Performance Pitfalls On Droid?

Oct 1, 2009

What are the most easy mistakes to make that can be performance sinks on Android?

The documentation mentions "some floating point operations" can be "on the order of milliseconds" - has someone tested this?

For the sake of discussion, let's assume its running on a G1/similar device.

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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 :: 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 :: 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 :: Key Functions Not Working

Jun 18, 2010

I have looked all over the place. Here in the forums, online, user manuals, etc. What I am looking for: When I am texting, I see above the "A" key is an alt symbol that looks like an arrow pointing to the right with a verticle line. It appears to be an ALT-function of some sort. What is it? What does it do?

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Android :: How To Use SQLite Functions?

Apr 1, 2009

I read in the documentation for SQLite that there should be some core functions and aggregate functions available, but I can't seem to use them in my code.. Can anyone help? Here's the documentation ad: http://www.sqlite.org/lang_aggfunc.html http://www.sqlite.org/lang_corefunc.html There is for example the function count() but how do I use it? I have tried to use it as stated below, but none of the functions in the documentation is available that way (i.e when I type "db." the list that shows in Eclipse documentation doesn't include any of the functions from the SQLite doc except from execSQL):
Code...

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Android :: Why Busybox Necessary - How It Functions?

Aug 28, 2010

Can someone tell me what busybox actually does and why it's required or necessary? I'm using a rooted captivate if it matters.

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Android :: Need To Sync Business Functions

Oct 7, 2010

New to android..been using WM 6.1 sync with outlook obviously seemless. Need the same type of functionality but it doesn't have to be with outlook. Looking for options to use for business. Being a small company I can go anyway I want, don't have any restrictions other than need to sync all with phone, laptop and desktop. Beginning to travel more so contact, calendar and task must sync (notes and a Today front end would be nice). I have tried Dejaoffice but I end up with 2 sets of contacts and calendars (Samsung and Dejaoffice) not to mention that the UI is lame (had just as good 15 years ago with Instant Recall). Don't mind rooting the phone if needed. So what options exist in the open source world? Love my captivate phone but need to be able to do business to keep it. Anxious to hear how the rest of the Android world does it.

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Android :: USB Functions For All User Devices?

Apr 23, 2010

Are there any USB functions for Android devices (all user devices, not rooted)? I'm curious because I might want to make an app that puts things through USB

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Android :: SQLite Creating SQL Functions

Jul 22, 2010

How does one go about adding a custom SQLite function from within the Android sqlite API? I have a function (written in C) that I'm able to add using the C API outside of Android as described here: http://www.sqlite.org/c3ref/create_function.html.

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Android :: Notes App With Specific Functions?

Jul 12, 2010

I've searched through the forums and tried a lot of notes apps, but I am yet to find one to my requirements:
- Should have widget support (I need to put some notes on my homescreen, not the note creation widget like 3bananas)
- Bluetooth sharing (or it stores the notes as .txt files on the SD card). Alternatively, it could sync with google in some way. If you know one that does these, please tell me. Else please tell me what app you're using, so that I can try it if I haven't already.

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Android :: How Do I Prevent Certain Functions From Getting Stripped?

Aug 29, 2010

I have a static library that contains some JNICALL functions, i.e. they are expected to be called from the JVM and are never referenced by the shared library that links the static library. However, it seems like function stripping is exterminating the JNICALL function (it's not visible in arm-eabi-objdump -t). I'm working around it by adding a dummy function with an impossible condition that calls the JNICALL function, but that's dirty. I know that there is a link option to prevent certain modules from getting their unused data stripped, but what is it? And how do I specify that option in the .mk file? I didn't see anything immediately obvious in arm-eabi-ld. Incidentally, the function stripping doesn't strip out JNICALL functions in the shared library itself, but it will remove those from the static library that the shared library is linking. What's the reason for that?

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Android :: Returning Through Multiple Functions

Sep 2, 2010

Alright, this might be kinda simple, but I cannot figure out how to do this. How can I change this function to return the String class_name? I know that I need to change the function from void to String, but what else do I need to do? Code...

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Android :: AppWidgetProvider - Convenience Functions

Oct 30, 2009

It seems like the convenience functions (onUpdate, onEnabled, etc.) aren't being called in the emulator on Android 2.0. Is this a bug, or are these functions just being eliminated? It would have been nice to see this documented somewhere.

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Android :: How To Work Button Functions?

Sep 12, 2009

Im having trouble with button functions i have a menu created but how do i give them functions so when there pressed they can actually do something?

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Android Image Processing Functions

Oct 15, 2011

I want to perform various image processing functions such as threshold,equalize etc on the image i capture from the camera...What should i use in order to do that?

Also,when i installed the app in my phone, after clicking the pic, the next screen appears, and after clicking the button for performing other functions, force close comes up...what could be the reason,because my code works fine without the camera portion...

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Android :: Send And Receive Text Functions?

Feb 5, 2010

Any way to get at the Send and Receive Text functions of a phone? In other words, is there a way to transmit a text such that another phone, within range and using my app, could receive that text? Proposed app: The_Haiti_Phone: All cell towers and land lines are down. I would create a text msg to my wife's phone and my special app would send it. All cell phones in range would pass it on. When the packet's receiver's ID matches a cell phone's ID, the msg displays to the user. In summary, in a catastrophe, all cell phones with my app act as cell towers.

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Android :: Want Camera Functions Like Zoom / Brightness

Nov 6, 2008

I would Like to see more camera functions like Zoom and brightness etc. Missing alot from a basic camera phone.

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Android :: Instruction Count In Nested Functions

Jul 22, 2010

I'm not sure whether I'm badly misusing InstructionCount or there is a bug, but let's assume the first one for now. The simplified situation is like that: I have a function (say, foo()) for which I want to track the number of instructions executed and the function itself calls another function (say, bar()), for which I also want to keep track of the number of instructions executed, something like: Code...

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Android :: Encapsulating Functions In Second Java File?

Sep 13, 2010

I've been messing with Android for a couple of weeks, i found many tutorials to follow, but i didnt find anywhere some "Style rules" to make the code looks better. I would like to know if its possible (im sure that it is, but dont know how to make it xD) to use more .java files to organize the functions. I mean, right now, i have myApp.java where i coded all my application, but is starting to grow so much, so i would like to separate some functions into another .java file. As i told before, im almost sure that this is possible, but i dont know how to link that second file so, can anybody help me?

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Android :: Run SQL Functions On A ContentResolver Columns Query?

Mar 22, 2010

I am wondering if Android's ContentResolver supports using SQL functions over the columns when you query a ContentProvider. Such as SQLite3 date functions, to get a specific date format, or datediff?

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Android :: Accessing Remote Services Functions

Apr 27, 2010

I ran into a problem with remote services. after i started and bound my service, i want/need to access it's functionality.

This works just fine if i work with buttons and onclick-controllers just as in http://developer.android.com/resources/samples/ApiDemos/src/com/example/android/apis/app/RemoteServiceBinding.html.

But actually, i need to access the services functions DIRECTLY after binding the service, like:

CODE:......

If i access the service function "getDataFromService()" in an onClickListener, it works perfectly. how do i access the services functions directly after binding/starting the service?

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Android :: Advanced Music Player Functions

Sep 1, 2010

I'm fed up with the stock player on my Samsung Captivate, and I have tried both doubleTwist and Cubed (now called Rockon?) and neither has impressed me much. Thus, I am looking for something with more functionality.I have two main requirements (requests?):

1. Need some way to rescan my library without restarting my phone.

If I add music from somewhere on the internet or from an app, I want the app to be able to see that something has changed, scan my music again, and update my library.Now, all I can do is either restart my phone (sometimes works) or connect it to my computer and do it manually.

2. ID3 tag editor

Sometimes you notice an error and want to change it. I have a separate program to do this as of now, and I would love to do it within my music app. It just makes sense.Now I've read about MixZing, as it satisfies #2 and everyone seems to like it, but I'm worried about #1.Anyone have any personal experience with MixZing or another player that would implement these two things?

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Android :: Telephony Manager Functions Don't Work / What To Do?

May 29, 2009

I have low expectations that this message will get any response as it seems that Google developers do not like to address issues too close to the Android core and to strategic mobility applications. However, as they say, hope is the last to die.

I am really puzzled by the lack of response to queries about issues with some TelephonyManager functions.

Specifically, there have been a number of requests in the past, including mine, about

getNeighboringCellInfo()

As per the link below, getNeighboringCellInfo() is a documented TelephonyManager function available to application developers.

http://developer.android.com/reference/android/telephony/TelephonyMan...()

Yet, getNeighboringCellInfo() does not work. Any attempt to call it in an application results in application failure.

What is the problem here? If Google does not want application developers to use this function (I cannot fathom why that would be the case), then please remove it from TelephonyManager, and save all of us time and frustration.

It's really puzzling that for such an open platform Android has so many secrets and rules.

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