I have a singleton class and I am using it to access databases. I would like to know how it would behave if I use the same from my remote service class which runs as a separate process. Will it create a new instance in that process or will it use the instance from the other process?
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I'm trying to get a simple vibration working and according to the api docs(http://developer.android.com/reference/android/os/Vibrator.html) all I need to use is this: public void vibrate (long milliseconds)
Turn the vibrator on. Parameters milliseconds How long to vibrate for.
However the behavior I am seeing is not what is described. Instead of a number of milliseconds, it seems this parameter translates into an "intensity"?
I tried: vibrator.vibrate(200);
And I got a sustained vibration which didn't stop until I exited my app. Initially I thought perhaps the api docs were wrong and the parameter was seconds, not milliseconds, so I tried: vibrator.vibrate(2);
This time I got the same behavior, i.e. continuous vibration, but the vibration was very gentle.. almost in-perceptible. This leads me to conclude that the parameter translates into an intensity, not a time.
Is it possible that this is a "feature" of the particular device? In my case HTC Desire.
I'm running 2.1 as my crappy telco hasn't distributed an update to 2.2, but it worries me that this behavior may differ from device to device.
I had an iPhone until I got the Droid yesterday. I absolutely love the Droid and would never go back to an iPhone. However, the iPhone integrated well with my car radio, which has a USB port. The radio can play from USB, but then I have to navigate my folders from the radio. It's difficult, unintuitive, and less functional than playing music directly from the phone.
Is there an app that would fake out a connected device to make it think the Droid was an iPhone, and would let me use the Droid's music player interface to play music through the USB?
I have a widget that acts as a launcher on the home screen. How can I make it behave like a launcher icon?
I use this layout for portrait:
CODE:................
And this is the background selector:
CODE:................
This way if I use the DPAD the widget is focusable but the click doesn't work. The touch still works but the widget is not displayed as focused.
I have a LinearLayout inside a HorizontalScrollView. The content is just a image. While scrolling, I need to achieve the same behavior you get when setting the paging option on a the iPhone equivalent of the HSW (scrolling the list should stop at every page on the list, not continue moving).
How is this done in Android? Should I implement this features by myself or there is a particular property to set or a subclass of HSV to implement?
If anyone can help me with some information if there is a way to make an application on Android Dev Phone ask for permissions, like it does on G1. When I install an application on ADP, I only get the message "no permissions required", is there a way to make the ADP behave like a G1 phone?
View 7 Replies View RelatedI am developing a simple widget which has a couple of buttons in its layout.
Before the widget gets added, the configuration activity is displayed, where the user can choose if the widget makes any sounds when the buttons get pressed or not.
Thus, a user can put two instances of the widget, one where he chose sound to be activated and another where he chose the opposite. However, I can not seem to be able to reproduce the expected behavior (that one reproduces sound and the other doesn't).
The buttons' behavior varies according to the flags specified to the PendingIntent:
- FLAG_UPDATE_CURRENT seems to override the previous intent/setting - no flags (0x00) seems to ignore any intent/setting after the first instance of the widget is put.
What I want to do: I want to be able to configure different instances of the same widget to behave in a different way, according to what the user specified in the configuration activity. I am attempting to do this with the help of the appWidgetId of each instance:
I have tried the following when assigning an action to the click of the button:
CODE:.................
This results in the first widget acting properly (The IDs printed in logcat are as expected) When adding a second widget, however, the first widget starts reporting the second widget's appWidgetId in its onReceive(), when it previously did no such thing. (because of the FLAG_UPDATE_CURRENT, I guess)
How can one make different instances behave in a different way? Is there a way to do this with the help of the appWidgetId?
I have elaborated a widget application for the purpose of debugging this problem which tries to be minimal, while reproducing the (un) desired behavior: http://www.2shared.com/file/8243059/b6519584/IntentTesttar.html
Android has such concept as a Service. It makes sense for interprocess communication. But if I need this service from Activities running in the same process regular singleton seems to be more convenient. No need to register, to bind. Are there any benefits to use service in the same process?
View 17 Replies View RelatedI'm quite new to Android development. When is it a good idea to create an Android Service instead of just using a simple Singleton class?
Take, for example, the data layer downloading information feeds from the internet. Using a Service seems too much for some cases but sometimes I might need access to a Context so I'm a little unsure about how to design the app.
I often run into the following dilemma: I need some singleton-like object in my app (typically some central manager-like thing) and this object needs a context for various things. This means that I either have to pass a context to all methods needing one or have some sort of init-pattern to the object. Neither is pretty I think. What is the correct way of doing this? Or is this simply (even the definition of) a Service?
View 15 Replies View RelatedI'm considering creating a singleton wrapper for a Context so my model objects, if necessary, can open and read from a database connection. My model objects do not have access to a Context, and I'd like to avoid needing to pass a reference to a Context from object to object.I was planning to place into this singleton a reference to the Context returned by Application.getApplicationContext(). This singleton object would be initialized in my custom Application instance before anything else would need to or have a chance to use it.Can anyone think of a reason to not do this?
View 3 Replies View RelatedI'd like to know if it's possible to create a Singleton Service throughout an application ? Let's say I'd like to cerate a Service to play some mp3... I'd like it to be a Singleton, we don't want two mp3 tracks playing through each other (well maybe some would want that, but in my case I'm not making a DJ app) :P Also this Service should be somewhat dynamic as in there should be some interface so that I can stop, pauze and play the mp3 file/ stream. Now I have a couple of questions : - is this feasible ? - should I be using a Service or something else ? - how can an interface be set up in between an application and a service so that I can start, stop, pauze stuff ? - can there be something like a Singleton Service?
View 9 Replies View RelatedI'm adapting Image Downloader from Google Android blog. I want ImageDownloader to be singleton since I'll be using it in multiple places in my application. I want also to be able to manipulate Bitmaps using different Strategies (eg. produce transparent bitmaps).I want to be able to use ImageDownloader in one activity and set transparent bitmaps, and in another use the same ImageDownloader but get black&white bitmaps using different strategy object.
View 5 Replies View RelatedI have a singleton in an activity. When I end my application (like pressing back button), and start it again after some time, the singleton is not recreated, but is holding previous state. Singleton is not destroyed if the application is destroyed? Do I have to null its static members in onDestroy() to avoid memory leak.
View 1 Replies View RelatedIs the AudioTrack fundamentally designed to be a singleton? Methods on the OnPlaybackPositionUpdateListener receive just one argument, which is the AudioTrack itself. And since the AudioTrack does not have getTag/setTag methods I don't see any way to distinguish among multiple AudioTracks in the OnPlaybackPositionUpdateListener methods short of keeping track of references. So, if it's so why it's not implemented as a singleton? Any thoughts. I am trying to implement concurrent use of the AudioTrack. Anybody has any experience with this approach? Am I wasting time?
View 3 Replies View RelatedOn Wed, Sep 1, 2010 at 1:19 PM, siva <sivaraj.r...@gmail.com> wrote: > I have a singleton in an activity. When I end my application (like > pressing back button), and start it again after some time, the > singleton is not recreated, but is holding previous state. Singleton > is not destroyed if the application is destroyed?
View 4 Replies View RelatedIn order to communicate with the server I need a huge global object (class with some hashmaps). all my activities (about 10) need that huge global object. which options do I have? I am thinking about passing the object using intends and about the possibility to make the object a singleton. using the db will be much too slow.
View 3 Replies View RelatedI have a singleton which stores some prudent information about the user of my application. At the moment, it stores the user's login and the user's location.The location is found via a Service. At the moment, the Service references my singleton directly to stuff the longitude and latitude into it. I would like to use a Broadcast Receiver to send a broadcast that the singleton hears and uses to update the values, instead. However, to register the Broadcast Receiver, I need a Context in my singleton. What is the slickest way to achieve what I'm wanting. Is Broadcast Receiver possibly not the appropriate object? Also, what problems am I looking at with using a singleton? I assume that Android will possibly reclaim this memory at any given time (which would obviously be bad); so how can I prevent that? Would passing in the application's Context and storing it in a member variable thwart this? The Android documentation states: "But, the life cycle of a static is not well under your control; so to abide by the life-cycle model, the application class should initiate and tear down these static objects in the onCreate() and on Terminate() methods of the Application Class," but I'm not entirely sure how to accomplish this.
View 1 Replies View RelatedI have two services, both of them lies in separate apk, which run in same process. The two service share same jar file by <uses-library> method. The jar file implement a class, say "test", is a singleton. But I found that two instance of test is created under this case, could anybody give me some tips? I want to ensure it's singleton. Code...
View 8 Replies View RelatedLet me give you the scenario.
Say that my first Activity that loads up, also creates a thread, which will run indefinitely in the background.
Now, if I move to another Activity, I assume that the thread that I initially created in the main activity will continue to run.
So, now to my main question - in order to manage this background thread from other Activities, is it safe to store a reference to that thread in a singleton object?
Can I pass a singleton class's object from one activity to another activity using intent? I am using singleton class as image class img = image class.get Instance();, so i need the img instance for another activity, how can i pass an object instance in Android.
View 2 Replies View RelatedI have a big background image for my views's background, which also can be tiled (it's repeadable). When switching from one Activity to another i want the background to behave like on the homescreen (the background moves only a bit, but the foreground moves one screen with). Is this possible and how? Here is my current background definition:.............
View 1 Replies View RelatedIt would be nice if StackOverflow had a section where we could post tutorials like mine so that I can answer literally hundreds of questions that have been asked here with a single blow. See... every day I read questions about how to pass complex objects between activities, how to save state so that your app can resume after orientation change, how to update listviews when the data changes, etc, etc. Here is the second part of a tutorial series I posted on my blog... I hope that you actually read it... because I haven't seen any examples like it anywhere... and it has changed how I think about developing for Android across the board. The question is... is there a downside or negative affect of developing like this?
Beyond Smart Lists - How Observable Singletons change the game. Please read through both of these tutorials carefully... I will answer any questions about it here that I can... I really want to know what you think about this and if it might solve issues for you. NOTE TO MODERATORS: there are no advertisements of any kind on my blog.. so don't just close this because you think I am spamming somehow... I am not going to duplicate my post here.
I want an EditText to look like TextView but still behave like EditText. I've tried applying TextView style to my EditText in my layout.xml file, like this:
CODE:............
But I get an error within xml editor: "Error: No resource found that matches the given name (at 'style' with value '@android:style/ Widget_TextView')." It is strange because @android:style/ Widget_TextView definitively exists - I double checked it in code via android.R.style.Widget_TextView. Another strange thing is that I don't get android:style offered in the xml editor while typing? There is android:id, android:text and everything else.. but not android:style?
I consider the hard way (making EditText look like TextView) to be: extending EditText and overriding it's onDraw method.
I have an app which declares a BroadcastReceiver, the receiver gets the broadcast, does what it needs to, then ends ensuring that everything is tidied up as needed. When I examine the system through the DDMS view in Eclipse the process for the application is still running after the receiver has completed. I've even boiled it down to a simple test case which gets a shared preferences instance from the context, checks a random setting, and then exits, and, when run on the 1.5 emulator (which is the minimum supported OS level) the process is still hanging around.The reason this is an issue is memory usage (which shows under DDMS as around 2MB).I've had queries about why the application still uses up memory even when it's not doing anything, so, my question is; Is this behaviour normal, or have I missed something that would make the process exit?
View 9 Replies View RelatedI've been able to send data via shared memory between threads within a process using MemoryFile.I then tried to send data between a service and an activity in different processes, but the data did not get passed. The name for each call the MemoryFile's constructor was the same.Is it possible to share data between processes using a MemoryFile?
View 6 Replies View RelatedWe were told that, as of Android 1.6, background processes were put in a Linux process scheduling class that limited how much CPU they would use. A few weeks ago, I ran a benchmark test that seemed to validate this claim.I have run more tests, and I am no longer confident in my earlier conclusion. I can get a background process to significantly impact the foreground process, more than would seem to be possible if the background process was, indeed, CPU-limited.
View 14 Replies View RelatedI'm having trouble using the nexus one in DDMS on Fedora 12. It is detected fine and I can see two processes, cooliris and uploader.These are the only two that show up. The emulator shows up just fine and i can debug from there. Does anyone have suggestions on how to get the nexus to connect properly?
View 2 Replies View RelatedI have read all about having separate processes for different Application components, and how to use them.I am curious, what are some appropriate use cases for when an application should actually use separate processes?It seems to me, the main advantage to using separate processes is to make the different portions of your app more easily killable by the OS.
View 7 Replies View RelatedI've been trying to locate some excessive object creation to deal with hiccuping caused by the garbage collector (any word on upcoming improvements to this, btw?), and have discovered that DDMS is the tool for the job.I shut down eclipse and booted up DDMS, and it finds my device, but lists no processes running (no matter what I run).Initially, it did list the "powermanager" app that I had installed, so I assumed this was causing some kind of conflict and uninstalled it and rebooted my device.Now it simply lists no processes.
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