I know this might be a basic question, but I am a beginner and I haven't been able to find an answer.
I would like to know, if it is possible to trigger some function/action while creating an activity. eg. trigger a void without user intervention, start an animation automatically after an Activity is created etc.(at the moment I am trying to trigger an animation without a button click, but this question is general and not specific code related).
I know how to bind an action to a button click and every resource I have found is doing that, I haven't, however, been able to start an animation or a void without it and I am not sure if it is possible. (I have tried using Handler, it worked but prevented the rest of the code being executed - I might have done it wrong, though as I really am a beginner)
so my question(s): Is it possible to trigger a function/animation without user intervention(click)?
If so, where can I find some resources to read about it? (I tried reading Android documentation already)
Thank you very much and I apologize if the question is too simple, I know it might be.
Please have a look at this photo.
It clearly explains the lifecycle of Android activity.
To answer your question, yes, it is possible to trigger a function/animation without user intervention(click). You have to call the function from onStart() activity.
Related
This is more of a curiosity than anything else but it would be good to get some feedback from everyone on possible problems and solutions etc.
Is it possible to use one "host" activity and use that activity to display 3-4 different activities?
I already use tab host in my app and this doesn't seem to fit my needs in regard to the menu idea, ill explain what I'm trying to do as it may help.
Im trying to find a nice clean solution to playing background music, but this could be applied to other functions as well, but essentially, after the splash screen i would like a "host" activity to load first and in that activity, load up a menu activity, when the use presses a button the menu activity, i would like the next activity to load up still inside the "host" activity.
I'm hoping this would make playing music etc as clean as possible and with as little extra coding as possible.
Is this idea possible? would it be beneficial? what would be the best way to accomplish this?
Like i said this is more of a curiousity than a "gimme code to do it", I can work that out once i know the direction to head in & if its possible, I mainly want this for b/g music at the moment but im sure this could be applied other functions.
Thanks for looking, reading giving your thoughts :)
phil
I would like to display a message to the user for some asynchronous event. For example for an alarm expiration. I would like to display a popup or dialog that is displayed over any activity is the foreground at the moment (and this can be some other application activity) leaving the current activity in the backgound.
Is there a way to do so in Android?
First off, you will be told that this is a bad thing to do, that it is against the Android way of doing things. Users do not like this. And that the Notification area is much better way to do this.
That said... there are ways to accomplish this...
A Toast will display no matter which activity is on the screen. So you could set up a background thread (or better a Service) that will display your information in a Toast. This might be good enough for you.
You may find it useful looking at some Toast source code here.
Also here is a nice page on how to create a custom Toast layout by replacing the default View with one of your own. (I have not done this, but it looks quite interesting):
Custom Toast Alert on androidexample.com
The alternative is much more difficult, and is to display a System Overlay window. Unfortunately you have to do quite a lot of work to get these set up properly.
Here are a few related questions that I used to get it working:
Creating a system overlay window (always on top)
System overlay android 4.0
How to create a system overlay in Android which allows interaction with the windows below it?
Each of these has links to many others - there are loads of System Overlay questions on here.
But things to remember:
In the old days, you could put a system overlay on top, and send
touches through to the activity below. This is no longer possible,
and so a lot of the answers are now out of date.
You may need to
play around with the flags in the provided examples to get exactly
the effect you are aiming for. Not all the examples use the same
flags, so there are some subtle differences in how each solution
works.
Then again, I also believe that the Notification area is a much better UI pattern to use, so I do recommend you try that first. It is easier to do, and most of us expect that type of behaviour rather than a pop-up.
The problem with a pop-up, is that it might interrupt a movie I'm watching. Or a game I'm playing.
Yes, i had created two dialog for income event for background and foreground
I am writing an android app that uses Fragments and an ActionBar.
Is there a simple way to know when the entire app has finished starting up? Each fragment has it's own layout, and my startup code needs to touch them all. Is there an event I could use to accomplish this?
Thanks!!
onCreateView is called after the view is "all there", so its a good place for code that needs to run late in the game. You could set a flag here or send an event to notify other views that you're ready, but it is per fragment.
However, fragments are kind of based on the idea that they will be created as needed. In a normal app they come and go dynamically so there isnt ever a time when the "whole app is loaded". So, there isnt going to be a single place you can check for whether all fragments are ready unless you make your own. Before doing that you might want to consider other ways to accomplish the task at hand. Your design may not be a good one if you are having to fight against the underlying system.
Is there any way to programmatically pause an Android app in Phonegap? I would like to mimic the behavior that occurs when you hit the HOME button. I've already had to overwrite the back button handler using this, and while in most cases I want it to do my action, when in a particular state the user would expect the app to minimize, and I want to replicate this behavior.
Keep in mind, on Android this is not the same as closing the app. That is quite easy to do with device.exitApp(); but I would like it to remember its state and keep running in the background. Especially if there's still an asynchronous job being done in the background.
Is there a feature in Phonegap to achieve this?
Possible duplicate of Manually pause an application in Android Phonegap, but I couldn't find some of the tools the OP mentioned there such as navigator, so I was nervious to totally edit and rewrite their post
The simple answer appears to be: no.
However, for anyone else that comes down this path, its not impossible. It's just that there isn't a feature of Phonegap to do it for you.
The Android equivalent of "sleeping an app" is actually just opening another intent. Specifically, opening the "Home" intent would sleep the running app and bring you back to the home screen. But as far as I can tell from asking around and scoping the docs, Phonegap doesn't have a direct way of opening intents.
What you (supposedly) can do is one of two things:
This plugin is supposed to be promising
Call the Java code that does it yourself using the means described here
Mind you, as of right now I've decided to not go any further with this, so I make no promises about either of those means, having not attempted them myself.
I invite anyone else who decides to pursue this further to update their experience here.
I am looking for some help, not being spoon feed source code (which from some of the threads I have read on this forum wouldn't happen anyway). I am really just wanting to know if what I have conjured up in my head is even possible or not, and if it is if I could get pointed in the right direction. So, I am looking to add a "view", doesn't really matter what type the concept would be the same for all of them, to appear when receiving or placing a phone call. You know the one that has the little droid waving at you or a photo, etc. The only thing is that I would only want like the top 30px to be this "view".
For instance, you receive a phone call and at the top of your screen on top of the receiving call window is a TextView with a note about this person (i.e. - he stinks).
The only thing I have been able to come up with so far is that I would have to bring up a layout that was either invisible or gone, but have yet to figure it out as of yet.
Am I barking up the right tree or do I need to find a different tree to sniff. Any and all help would be appreciated.
I honestly don't know the answer to this, but if it were possible then presumably you would have to have your own custom Activity launch in response to an incoming phone call event. This Activity of your own would replace the standard system phone application. So I did a search on here and the most vaguely related previous questions I could find within a short time are these:
Is it possible to write a new "phone" activity, and if yes then how?
Launch an activity at end of a phone call on Android
Answers on those seem to suggest the phone would need to be rooted before you could replace the standard phone app for receiving calls.