Android :: How To Cache Views And Avoid Calling OnCreate Everytime
Apr 27, 2009
With Android, I've got an application that seems calling "onCreate" every time on a new instance of an activity, because this activity is the son of an another and it finishes itself while it ends its role for one piece of data.
The calling of "onCreate" everytime seems to be re-parsing the xml to create the views and re-attaching/re-creating the listners to the code and so on. So Is there a way to "cache" an activity to be recalled everytime, without seeing it if we click on "back" in the mobile devie? it's like having it really hidden (not accessible with the back button) and destroyed only if it's necessary.
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Jan 6, 2010
I have a simple ListView and on that ListView I have placed a number of custom defined Views. The CustomView has ImageView and two TextViews.
The CustomView also has a "stateful drawable" as background, so that the background image (a 9-patch) changes if you press the Row in the ListView. When pressing the Row, the background image changes to a Red-ish thing.
The problem is that when the background changes from the default greyish, all the Views in the CustomView (ImageView and TextViews) still have their greyish background and thus creates very ugly greay boxes on top of the now redish background.
What is the best way to solve that problem? I hoped that such things were handled automatically (as it is done in for example .NET), but I was wrong it seems.
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Jul 31, 2010
In my application I notify the user with notifications, if something special happens:
public void triggerNotification(String msg) {
notificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
Intent contentIntent = new Intent(this, ABC.class);
Notification notification = new Notification(R.drawable.icon, msg, System.currentTimeMillis());
notification.setLatestEventInfo(this, "ABC", msg, PendingIntent.getActivity(this.getBaseContext(), 0, contentIntent, PendingIntent.FLAG_CANCEL_CURRENT));
notification.flags = Notification.FLAG_AUTO_CANCEL;
notificationManager.notify(notificationCounter, notification);
notificationCounter++;
}
If the user clicks on the Notification, the onCreate() method is called. But I want that a specific method in my app is called, or if the app is not in the foreground, that it is brought back to the foreground. I know there are lots of tutorials that explain how to handle notifications, but I just don't understand them completely and wasn't ever able to implement the things like I'd like to.
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Jul 30, 2010
I am making twitter application in which i open browser for user authentication and i pass call_back URL when launching authentication browser.
Problem is after authenticating it is calling again oncreate of TWitterShare class instead calling onNewIntent method, why is that ? my another class working fine i am unable to find difference any idea by looking at the following ocde why it is calling oncreate again ?
CODE:...................
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Mar 25, 2010
I have an ArrayAdapter powering a ListView. I would like to change the data behind the ArrayAdapter and update the ListView's. Sounds like notifyDataSetChanged(); would be exactly what I am looking for, but it updates the entire ListView, and I would prefer to update on a row-by-row basis.
Is there a way to do this with ArrayAdapter, or do I need to manage my data some other way if I want this functionality?
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Sep 17, 2009
I've had this problem in a few different apps now and I can't seem to find a solution.
If, in the onCreate() of an Activity, I start an activity that uses the dialog theme it doesn't draw anything to screen... the whole screen stays black. All the views are there (e.g., I can tap where an EditText should be and it'll give me the keyboard), they're just not visible. code...
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Jun 12, 2009
I created a custom SurfaceView called CaptureView and tried to add it into main.xml file.The application seems to work fine but if I switch from main.xml tab to Layout in Eclipse the text NullPointerException appears instead of layout preview.Does anyone know how this issue could be solved?
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Sep 20, 2010
Does anyone know how to avoid getting mobile views (page) on web sites in the browser? I can't figure it out. My old HTC Hero had a way to not get the mobile versions..
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Nov 16, 2010
I am implementing a music player application in Android. My play list selection screen is implemented as a tab selector widget which contains a ListActivity inside each of the tabs: Artist, Albums, Songs.
I want to update the ListView in each of the ListActivity when I delete an item from any of the lists.
i.e. When I long press an item in the Artists list a context menu is drawn with "Delete Artist"
And it should delete all the songs from this artist in the Songs ListView, delete all the albums by this artist in the Albums ListView, and finally delete the entry for the artist in the Artist ListView.
Each of the ListActivity has its own fillData() method, which updates the ListView when the button in the context menu is pressed.
How can I call the fillData() method of the Albums ListActivity after I update the ListView inside of the Artists ListActivity?
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Feb 28, 2010
I want to populate a table, defined in layout xml file through the programmatic way. I have define Table with a single row defining its header, with all the attributes set. Now i want to know a way so that i can just replicate that header row in the table with new content.
I tried using inflator inflate(int,view) method, but at runtime it showed up with error.
Here is the XML code for the layout file defining the table
CODE:.................
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Mar 6, 2010
I have the following XML code:.................
The idea is to change the views, whenever I press one of the radio buttons. When I press a button the first time everything works out fine, but the second time I press a button, I get an IllegalStateException, and I can't quite see why I'm getting this.
Also, the Activity seems to set all my global variables to null, which is why I have to create them every time I switch from portrait to landscape or vice versa. So I would like to know if there is a way I can save my views in the Bundle, or any other way in which I can permanently save my views, so I don't have to add or create them every time, I flip the phone. And whenever I flip the phone, it seems that it rereads the main XML file, causing the RadioGroup to be set to 2D even if the 3D button is checked. This is because I've said the 2D button to be checked from when the app is first created, but I would like to also save the state of that RadioGroup.
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Aug 16, 2012
In cm roms, dalvik cache of system apps are generated in /cache but those data/apps are generated in /data. Is there any way to disable this behaviour? Cache partition in our phones is too small. In AOSP and AOKP and stock roms, dalvik cache is always generated in /data no matter whether its a system app. any way to achieve this in cm roms?
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Jun 16, 2010
How do you align views relative to the "middle" part of another view? I think it is best explained with a pic of the UI I'm trying to create in android.
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Jun 21, 2010
I'm implementing an image cache system for caching downloaded image.
My strategy is based upon two-level cache:
Memory-level and disk-level.
My class is very similar to the class used in the droidfu project
My downloaded images are put into an hashmap and the Bitmap objet is wrapped inside a SoftRererence object.
Also every image is saved permanently to the disk.
If a requested image is not found into the Hashmap<String,SoftReference<Bitmap>> it will be searched on the disk, readed, and then pushed back into the hashmap. Otherwise the image will be downloaded from the network.
Since I store the images into the phisical device momery, I have added a check for preserve the device space and stay under a 1M of occupied space:
CODE:.................
This method is called sometime afte a disk writing:
CODE:..............
What I'd like to add is the same check on the HashMap size to prevent it will grow too much. Something like this:
CODE:.....................
My question is:
What could be a right MAX_MEMORY_SIZE value? Also, Is it a good approach? A good answer also could be: "Don't do it! SoftReference is already enough"
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Jan 25, 2010
Is there any way to query a root view of an activity for all of its child views even before the root view or its children have been inflated? I guess what I'm looking for is whether a view knows ahead of time what children it will have before it gets inflated, and can I get that list in some way. Bizarre I realize, but I think it will help me with some unconventional automation testing I'm working on. I haven't found anything in the API like this.
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Mar 7, 2010
Let's say I have a LinearLayout, and I want to add a View to it, in my program from the Java code. What method is used for this? I'm not asking how it's done in XML, which I do know, but rather, how can I do something along the lines of (One View).add(Another View) Like one can do in Swing.
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Feb 15, 2010
I'm using Windows 7 Ultimate 64 bit edition and Eclipse 3.5 with the Android plugin. Every time I create a new project and try to publish it, I get an error like this:
CODE:............
The emulator is working perfectly, adb can see it, I can even logcat from it, but it can't push or pull anything from it. Nothing appears in logcat to suggest the emulator even received any command. It doesn't matter if I have the Firewall on or off, or if I try invoking adb install to bypass the plugin. Nothing works even with a blank app.
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Apr 3, 2010
Is there a simple way to activate/deactivate bluetooth without having some dialog popup requesting the user's permission every time? I have an app that plays music (it's actually part of a scheduled alarm). I want to play music through some bluetooth speakers I have already paired the phone with, but I don't want bluetooth to run while I am not using that app or after the app has shut down -- I want to reduce any unnecessary load on the battery.
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Jul 3, 2010
After a short period of not using the phone, when I want to do something through using my wi fi connection, it takes ages to do anything, then when I go into the wi fi menu, the phone is always trying to authenticate with the router, so I have to switch wi fi off then on again and re connect to the router, then it works fine for a while until the next time I want to do something.
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Sep 20, 2010
When I try to download angry birds it says download unsuccessful everytime. Anyone else experience this happening or have suggestions on why it could be doing this? All other apps and games download and install just fine.
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May 2, 2010
Why does the Google Voice App crash everytime I try to open it or sign into it?
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Sep 29, 2010
I just bought the Xperia X10, and I've tried to sync it about 10 times. I've updated my contacts onto the SE website, and I'd like to sync them with my phone. It seems to send 2 items, then the sync shuts down and says 'failed'. I'm doing it via wi-fi, not using the 3G network, does that make a difference?
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May 5, 2010
i know its probly very simple but i cant for the life of me find the option.
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Oct 26, 2010
This happening to anyone else? It's getting VERY annoying. I'm running Froyo, and normally I'm connecting as a mass USB storage. Everytime I connect it, the phone reboots before I can use it via USB at all. Any fixes out there?
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Sep 30, 2012
How do i stop my key pad from vibrating (razr maxx) everytime i hit a letter ( eg sending a text) i want it to be silent
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Jun 1, 2010
I've had my phone for a month and I love it to pieces. Anyway, I've noticed lately it is getting more "glitchy" than it was in the beginning. Little things like, I'll be typing a message in a message box (happened in a facebook message and in an ebay message) and all of a sudden the keyboard will go away, go back to the regular screen, and the message will be deleted. Which is really frustrating after typing a long one.
This I can deal with.
I had, at one point, the pattern set to be used everytime my phone was unlocked (I found out people were playing with it at work when I walked away). So I set it to have a pattern. Now I no longer need it, so I turned it off. Now, everytime my phone gets unlocked, the pattern screen (with the 9 little circles) shows up. All you have to do it touch it, anywhere on the screen, and it goes away. I've checked and triple checked my security settings, no pattern is even set, and the boxes are unchecked for requiring a pattern.
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Nov 22, 2009
This has almost become a gag, if I hit the lock button or allow the screen to timeout while inside of a text message, when I awaken the screen for whatever reason and I do not immediately hit the home button the messaging app freezes and then force closes. This happens if I try to respond or go back to the msg list. Is anyone else experiencing this issue?
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Sep 19, 2010
Since no one answered to my post in the help section i was hoping more eyes would see this. i'm running the leaked 2.2 version and haven't had a problem. Recently i installed the latest launcher pro and now my brightness will not save. everytime phone is shut off it reverts to 0 brightness. same thing happens when taken off the charger, it reverts to 0 brightness. can someone help? is this a launcher pro problem or what?
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Jul 20, 2010
Mods, please leave this thread here in hopes it actually garners some attention, the support section does not receive anywhere near the traffic this one does!
This literally happens to me EVERY time I try to use it, it didnt always do this so I'm not exactly sure when it started. I've done the normal reboot etc, does anyone have a fix/reset for this thing?
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Jul 26, 2010
I have an Xperia x10, everytime I try to open an MMS, I get the following error message:
Sorry! The application Messaging (process com.android.mms) has stopped unexpectedly. Please try again. Force Close!
Even after rebooting the phone, it doesn't work! what should I do?
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