Is it possible to do polling in Android? For example, I want my application to monitor a directory continuously. If there is for example a new folder created in that directory I want to log it down. Is it possible to acheive this by polling? Or is there any other way to do this?
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So it looks like mobile phones these days are capable of providing gps data ;) I'm building a django app with a mobile edition that I want to be location aware. My question is, how does one access GPS data? Is there a standard, or do you have to custom code for android/iphone/other. Ideally, I'd imagine it being provided in the HTTP request in the same way you get information such as the IP Address and User Agent.
View 4 Replies View RelatedI intend to develop an app on android that can help people selecting the best pizza/ice cream/hot dog in a certain town based on their ratings through a poll. Now what resources do I need to achieve the desired solution? Do I need a web service or website/device connectivity for the desired poll? I would like to start off with a simple application that just shows polls or ratings for a certain item.
View 2 Replies View RelatedI am required to work on an application which is be deployed on devices running Android 1.5. The application is supposed to maintain a connection with a server and regularly poll it for new data. The server will notify the client of new data following which the client will connect to the server and download the data.I know that ideally a push based approach will be more conducive here given that we are to run this on a mobile platform. Also, from Android2.2 there is going to be support for C2DM(Cloud to Cloud device Messaging) but as already mentioned this application is for devices running Android1.5.Implementation: I was thinking of using AlarmManager which would Broadcast Intents periodically(poll interval), The Broadcast receiver will then try to connect to the remote server and make data changed check. If the server has an update, the thread will connect to the remote server and download the data from the server.
Problem and Issues: 1. Is this the right way to approach the problem? 2. Is AlarmManager reliable? Would it remember Alarms after a device boot? (I think it does) 3. How do I ensure that battery usage is kept at minimum.(I have heard something about using "keep-alive" to sustain the session for longer time..what is this legend?) 4. What are other things that I need to consider? I am sure I must be missing lots of things here.
I have a Service that uses the LocationListener, and it will be running from boot, indefinitely. My question is, how often is too often to listen for location updates? Is 5 minutes a battery killer? What about 1?
View 1 Replies View RelatedI'm trying to pulse my bluetooth dongle, to see if it is range. Every second my Android sends a char to the dongle, which then responds with a char. If there is no response, or the char is wrong, then it should conclude that there is no connection. I'm able to send from Android to dongle (attached to MCU), and the dongle is able to respond. All I need is a simple way to read each char (when received) to compare it. I'm trying to do it in a seperate thread to make it run in its own loop.
Here is my code so far, but I think I might be off, so if you could give me a pointer!
void readFromInputStream()
{
Thread readFromInputStream = new Thread()
{
public void run()...............................
what I need to do is auto-register device if not already done and then start polling messages with the credentials I received through this registration. Now, after I read quite a bit about services, threads, asynctasks and the AlarmManager I'm totally confused about how to handle this. :-s So, there are my two main tasks. What would you recommend as a not-too-silly approach
1.) Registration
I'm currently spawning a service from my UI thread if there are no credentials saved in the DB. Inside this service I start an asynctask that POSTs my request to the server and receives the credentials for the new device. stopSelf ends the service.....................
I working on the app where I get the data from the server using rest call and add it to the view. I get all the initial data correctly. I use AsyncTask for doing it. Now I want to periodically (say 2 mins) fetch the new data from the server and add it to view.Periodically fetching data (polling) from the server in Android.
View 2 Replies View RelatedI went into Weather Bug (free version) to check the weather and accidentally hit the menu button. Decide to check preferences for the heck of it and I see "Enable Updates' set to yes and Update Interval set to every 1 hour. What?? I know it's probably not a huge drain - but I had no idea that it was checking on a regular basis (and why I don't know). So please check your apps to make sure they are not updating data auotmatically! After that I went into every app I had to make sure I was either signed out or or set updates to manual.
View 3 Replies View RelatedI have a webview and need to trigger a function when a user clicks on particular url. How can I achieve this?
View 5 Replies View RelatedSo I'm struggling a bit with what is probably a fairly basic concept.. Activity Lifecycle.I have read a bunch of thread on the topic, and I feel I understand well both the functionality, and rationale behind the lifecycle model implemented for Activities, but it raises a bit of a problem for me. My app (game) has a couple of distinct Activities for various sections:
1. The TitleActivity is a very small Activity that just launches a GLSurfaceView and renders a startup logo.I use this to detect the OpenGL capabilities of the device (eg so I know if it's using a software renderer)
2. The LaunchActivity is the main menu screen where the user can access options etc and start a game
3. The GameActivity will either launches a GLSurfaceView or a standard View depending on hardware capabilties.
The issue I am having is that I want to pre-load some "slow-to-load" resources, specifically audio, in the Title Activity so when the Launch Activity renders I can play some background music.I have the concept of a "media library" which I use throughout the game.Because of memory limitations in the SoundPool, I have limited this to only absolute real-time sounds and all others are played using mulitple instances of MediaPlayer.Hence my media library has a bunch of pre-loaded MediaPlayer instances which I access regularly during game play.. so it makes sense to have a centralized access point for all audio.All fine, however the problem is that when I launch one activity from another.. for example the TitleActivity starts the LaunchActivity (via a call to startActivity(Intent...)), the former goes through the onDestroy stage of its lifecycle.Now logically I had assumed that if I allocate a bunch of resources in the onCreate of an Activity, I should clean them up in the onDestroy, however in the case of my "media library" if I load up the audio files in the onCreate of my TitleActivity they will be torn down when the LaunchActivity is started because the TitleActivity will have its onDestroy() method called.
I'd like to populate a listview from 2 tables. Anyone know how I can achieve this? Currently what I have looks like but it only works with one adapter.
View 1 Replies View RelatedI am developing an application in which a user keeps on scrolling and each view displays a single text. The views are not suppose to end. How can i achieve that?
View 4 Replies View RelatedI want to make my android project Internationalization,but i don't know how to achieve it. I have searched on the internet,and just know i have to make values-xx file in
es.I want to know what should i do about the code.
I am trying to develop small application for reset Logging on Phone. Can some one throw some Lights on how to achieve logging in AndriodRunTimeInit whenever there is exception? I want to write into file whenever there is RunTime exception.
View 1 Replies View RelatedIs there any way to achieve perspective drawing of an image.. are there any APIs.. or is OpenGL the only solution..
View 2 Replies View RelatedThings go fine, and i am able to design a layout like this...
View 3 Replies View RelatedEver since I upgraded to 2.1 my email accounts have not been polling like they are set to. In some cases, it won't poll until I manually check it. I've tried 2 factory resets, but no luck. They are set to 5 min.
View 2 Replies View RelatedI am drawing a pretty simple scene, with one large texture the about size of the screen (two triangles). I notice that the frame-rate is irregular: in most of cases, a frame finishes in 17 ms. However, in about 1 of 10 times, the frame finishes in 33ms.
My guess is probably some background services need to run. However, the Linux scheduler is biased towards my FG app, so the BG services are usually starved, until they can't take it anymore and they grab the CPU from my app ....
I am seeing stuttering in the animation. Is this due to the irregular frame rate? Should I delay each frame so that all frames are rendered with 33ms frame time? If so, what's the best technique of achieving this?
Is there an API that I can call to guarantee CPU resources for the render thread .... I really hope Android runs on some sort of real time kernel ...
On iPhone, Mobile Safari is WebKit based and supports hardware-accelerated -webkit-transform CSS properties. To be specific, I use the translate3d() transform.
What alternative is there for the Android browser? I need it to work on Android 1.5.
I would like to have a layout with 5 times 5 buttons. Each of them should have the same width and height (they should be square). And I want the whole matrix to use the screen width (or height, depending on rotation).
I currently do it "by hand" in the Java code:
CODE:...........
This can be improved by obtaining screen width first and then dividing by 5 to get rid of this literal 60. But I'm wondering how I can do this in the res/layout XML file? How can I specify for the height to be the same as the width? (I can set the width to match_parent.)
When i use toast to display some text on screen it displays little bit above the bottom(default position).
now i want to display it in the middle of screen or according to my choice can any one guide me how to achieve this?
When using a mediaplayer to play back an audio file, you can set looping to true - that's not the issue here.
If looping is set to true, there's still an audible gap between the file finishing and then starting again.
How could I achieve true gapless playback? I've attempted using two instances of the same file, overriding oncomplete and onseek.. can't seem to improve the gap though.
- Does the standard Gmail application that comes with the phone (not the email app) utilize polling on a set schedule, or is it set to automatically push messages to the phone as soon as they hit the Gmail server? I have noticed that what it does seems to correspond to my Google Account Settings (and what I have checked). Specifically, when I check off the "Sync Gmail" feature, I seem to get my Gmail emails on my phone in real time. Does this mean that checking this option allows Gmail to "push" emails to my phone, or is it simply polling at very frequent intervals?
- Which, in your experience, uses less battery: setting the phone to poll for e-mails every 30-60 minutes, or simply having the server "push" the e-mails straight to the phone? Also, does "pushing" e-mails work when Syncing is turned off (via the Power Control widget)
Strangely I find no support for Midi in Android.
The only thing that comes close is the Jetplayer, but this only takes a existing .jet file.
I want to dynamically generate a midi file with some intervals and play it.
I even thought about just manually creating a .jet file with a tone and then transposing it with the jet player, but it limits the transposing to -12, +12. Which is not so good for me.
There also is a ToneGenerator on Android, but it's limited to predefined tones with no way to transpose.
Does someone know how to achieve midi generation and playback on Android?
Is there a way to change how often the device updates my email? I had a sprint Hero and switched to the moment (very good decision), and I changed it on the Hero to improve battery life.
View 2 Replies View RelatedI am preparing to program an useful application, I would like to collect your ideas.
Any new ideas of apps that helpful in daily life, even achieve the society?
The following code executes a function that retrieves a file via ftp and then displays it in an imageview. Since I'm using the main thread the UI locks up, somebody tells me I can use asynctask to make this work but I can't figure it out :<
Is anybody familiar with this that could offer me some guidance? code...
How can I achieve the following layout in Android?
What I would like, is to have the 3 blue boxes top aligned in their view, and then I'd like to have the red box centered underneath the blue boxes, but so that when I animate the red box up, it slides underneath the blue box.
I have tried placing the blue and red boxes in different layouts, but as soon as I animate the red box up, if it goes outside the border of its layout, it disappears (I don't want the red box's layout to clip the red box, I want the red box to slide under the blue box so that the blue box occludes the red box.)
I have also managed to create this layout using a series of nested layouts, but because of the draw order, the red box always appears on top of the blue box. I attempted to use the bringToFront() method, but I found out that this only works on sibling views within the same layout. Unfortunately I can't get this type of layout while keeping all 4 views within the same layout. Any suggestions? (also, if anyone has better suggestions for the title of this question I'm all ears)
Is there a way to achieve 'right click' functionality. Basically, I want to save some pictures from few web pages by using right click->save image as.
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