How can I maintain the position of my ListView in my activity when I go to another activity (by launching another intent) and then come back (press the back button)?
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My ListActivity is bound to an ArrayAdapter where I have overriden the getView() method. If I change the visibility of a widget in that method or modify the view's background color, those changes somehow get lost once that modified list item returns after being scrolled off the screen. In fact, some other view in the list is picking up the changes. How do I get the modified view to look the same when it's redisplayed after scrolling?
View 1 Replies View RelatedIf you derive a class from ArrayAdapter for the purpose of customizing the views of listview items, and you vary the background color of those items by doing something like this in getView()...
View 2 Replies View RelatedI have a listview displaying my data.Ok. I want to set the scroll position in a position of my choice, but I just cant do it. I used :
myListView.setSelection( anyPosition ); myListView.setSelected(true); and has not worked. I also tried : myListView.scrollTo(0, PositionY); and myListView.scroolBy(0, PositionY);
and there's a strange behavior, this two methods doesn't put the scrool in the "PositionY", it made the "PositionY" be the first position in the list, cutting everything that exist before.
I have a long listView that the user scrolls around and then returns to the previous menu. What I want is that when the user opens this list View again the list to be scrolled to where the it was previously left. Any ideas on how this can be achieved ?
View 2 Replies View RelatedI have a ListView that is controlled by a standard BaseAdapter.When the user clicks a button, I want the ListView to Scroll into view the 100th record.How is that done?
View 1 Replies View RelatedIn my app, my main class extends ListActivity and calls a fillData() function to reload the list whenever changes are made. I'm still getting the hang of this, so I borrowed that concept from the Android Notepadv1-Notepadv3 tutorials. Everything works great, however whenever I need to change the list (remove an item, re-sort it, edit an item), the ListView refreshes and loses its scroll position. The scroll position is reset to the top after each fillData() call.
It appears to be resetting the scroll position to the top because I'm using setListAdapter() each time in fillData(), setting it to a new SimpleCursorAdapter. How can I get the list to "update in place", where the scroll position is seamlessly maintained to the user? I tried heading down the "items.changeCursor(cursor)" path, but that didn't seam to do much for me.......................
In a ListView/CursorAdapter, it is easy to go from a position to an itemId
CODE:..........
Is there any way to do the reverse mapping? From an itemId, get its position in the list?
I've just added a header to my ListView and I have to change a bunch of code because the header essentially becomes position 0 (Meaning the Cursor indices of my CursorAdapter do not line up with the indicies of the list. They are off by 1 now). Why? This seems a bit silly to me.
The only reason I can come up with is that a developer may want to access the header. Fine. Provide something like getListView().getHeader().
I am using a ListView with an ArrayAdapter that holds objects. When I select an item, I am capturing the position and index of the selected item. If I scroll down prior to selection, the position and index represent the location of the item in the list. Selecting that items takes me to another activity. When I use the back button to return to the list, it seems that the ListView gets a new position and index for the visible items.
As a result, I can't figure out how to reference the selected item during the restart() of the ListView Activity. I have tried to capture position and index, but as I've said, they change upon returning to the Activity.
Is my understanding of the ListView "redraw" correct? Does it renumber my items based on what's visible? -When in the life cycle is getView() called? Is there a way to force an update to the ListView so that my captured index still points to the same object?
I was wondering if it is possible to start a ListActivity and in real time decide how far down the list it should be focused on. (Example: When the activity is started it checks for certain conditions and then it may scroll down to a row partially through the list.)
View 1 Replies View RelatedI'm building a chat room application where new events are being polled for every X seconds. Every time that happens, this code updates the RoomAdapter (a custom subclass of ArrayAdapter) with the new data and scrolls it to the bottom:
RoomAdapter adapter = (RoomAdapter) getListAdapter();
for (int i=0; i<newEvents.size(); i++)
adapter.add(newEvents.get(i));
getListView().setSelection(events.size()-1);
This is fine, except that if the user is scrolling up to glance at the room's history, it's going to jump her down to the bottom when the poll happens. What I'd like to do is have it so that if the user is already at the bottom of the list, it stays there after a poll for new events. If the user's intentionally scrolled upwards, I'd like the user not to be disturbed.
How do I detect when I'm already scrolled to the bottom of a ListView?
Note: I can't do getListView().getSelectedItemPosition(), because as the docs note, calling setSelection when in touch mode does not actually select the item, just scrolls to it.
I am aware of setSelection(), setSelectionFromTop(), and setSelectionAfterHeaderView(), but none of them seems to do what I want.
Given an item in the list, I want to scroll so that it is in view. If the item is above the visible window of the list, I want to scroll until the item is the first visible item in the list; if the item is below the visible window, I want it to scroll up until it is the last visible item in the list. If the item is already visible, I don't want any scrolling to occur. How do I go about this?
i've just returned to Android after about a year and a half and I never remember having this "issue" with my old galaxy s2x. But i am finding that whenever i am scrolling down a list, facebook, instagram, or even a webpage, and i hit the back button, it always starts me from the very TOP of the page again. I am used to just hitting back and having it remember my position halfway down or wherever i was. is this just an android thing?!
View 6 Replies View RelatedHow do i get back the image taken from starting the Intent(MediaStore.ACTION_IMAGE_CAPTURE)?
I need the image to be display as a thumbnail and also be attached to email.
I'm working on an android application that plays video, by using an intent:tostart = new Intent(Intent. ACTION_ VIEW);tostart.setDataAndType(Uri.parse(movieurl), "video/*");startActivity(tostart);This works great. However, when you press the back button (on the device), the movieplayer goes back to the beginning of the movie. Only when you press back again, it goes back to my application. While the current behaviour makes some sense, I would like to know if I can change it: Is is possible to directly go back after pressing back?
View 1 Replies View RelatedI got one question regarding the intent action "ACTION_CALL". What is the correct way of getting back to the own application/activity after the user ends the call? The only way that came to my mind uses a PhoneStateListener in a background services that waits for the CALL_STATE_IDLE event starting up the application again. But I am not quite sure if that is the correct/intended way of using the intent.
View 1 Replies View Relatedi have a drawer menu, when i press one of its buttons to start a sharing intent as below:
Code:
Intent iFriends = new Intent(Intent.ACTION_SEND);
iFriends.setType("text/plain");
iFriends.putExtra(Intent.EXTRA_TEXT, "http://www.liveplus.mobi");
iFriends.createChooser(iFriends, "Invite Friends");
startActivity(iFriends);
The sharing dialog appears, but if i press the back button, the whole application exits!
This questions somehow relates to the question when I was looking to get the extras back in startActivityForResult but now I face another challenge.
I have subscribed to receive ProximityAlerts and I have explicitly constructed the Intent to include some Extras. But when I got the service the extras are not there.
After the answers here is the working code:
CODE:..........................
The documentation says param PendingIntent to be sent for each location update.
On my htc i was looking through display, i see g sensor calibration and i perform this calibration and after i do so the screen seems to have a delay when switch from the horizontal position to the vertical position. its weird because when i switch to the phone horizontally it switch normally and responds fast. but when i switch back to vertically it takes almost 7 seconds to actually switch back, sometimes it switch within 2 or 3 secs but never as quick as switching horizontally.
MQuote:
Originally Posted by Rigmaster
Make sure you have the latest updates, which impact speed on the device in some unpredictable and unexpected ways. During system updates, your Evo may reboot and will take the g-sensor changes as last calibrated.
If you're already updated, shut down and repower (soft reboot) should do the trick. I actually updated my phone and after it started to do this. I restarted the phone plenty of times i even took the battery out for 30 seconds. It only does it when im texting on the browser, basically everything but the camera. He camera screen rotation is perfect. I even rooted the phone but i havent figured out how to use the root to fix the problem. Should i do a firmware update? Because i just did the htc software update.
After a successful web view is loaded, now after some processing on the HTML page, I would like to return the control to the main screen. Is this possible in Android?
The control after the webview is launched, is in the browser, so after I make some ajax calls and then get a positive server side message. I would like the control goback to my Webview Activity.
I have TabHost with custom ListView implemented. My ListView disappears after returning from SMS screen when I try to switch tab (refresh list content).
I have context menu option to send SMS to contact from the list, I start SMS activity there and Im able to return to my app. If I don't type anything in SMS screen, just return immediately everything is fine. List will work. If I type something in SMS and press back key, toast will be displayed: "Your message is saved in Drafts". And now if try to switch tabs, list content disappears.
Debugging revealed that list items are present, and that list adapter constructor is called. However, listAdapters GetView function is never called. And list results are not displayed.
I found similar problem in this post: http://groups.google.com/group/android-developers/browse_thread/threa...
Im working on sdk 1.5 and device.
Here is my list adapter function, pretty standard:
CODE:..................
my ListView widget has no special properties, just width and height to fit parent.
In my android app I have a Tabhost with a ListView as one of the tabs. By clicking on an item in the ListView (an address) I start an Intent to Google Maps for directions and the choice dialog pops up for google maps, web browser etc. Problem is if I press the hard back button then the launch dialog goes away but also the ListView is cleared. Any idea why?
View 1 Replies View RelatedThe requirement is totally simple: I want to have a lite and pro version of an app. There is a little bit of difference between those two apps, but they are 99% identically. Unfortunately it seems that the best choice is to really treat this as two projects that are one and the same and copy over the source code and assets from one to the other. The Android Manifest file must be different, because the Android Market - for some reason - makes the implementation's package name the ID. Working around this ID issue the straight forward approach would be to have a third project with the common code that exports its code, libraries and in a best case scenario also the ressources to the other two objects. Unfortunately this doesn't work. Only the actual Android projects generate the R.class and so the common project would need to be dependent on it..
View 6 Replies View RelatedI am new to android programming. In my application, i want to implement automatic scrolling. So, i used scroller for this purpose.It is performing scrolling but not maintaining constant speed till the end of scrolling the text. Can anyone help me out of this problem.
View 2 Replies View RelatedAccording to the instructions found here, to make your app state which screen sizes you can support, you'll need to compile your app against Android 1.6.
View 1 Replies View RelatedDuring my game loop I am constantly loading images using BitmapFactory.decodeResource(getResources(), R.drawable.objectx); Most of the time I'm calling images that have already been decoded earlier. Am I slowing down execution by decoding the resource every time? Is it better to store every image into a Map (or Dictionary) at the beginning of the program? If so, how do you get the resource IDs for all images in the drawable folder?
View 1 Replies View RelatedI would like to know if its possible to prevent my application from looking different every time I run it on a different android phone. For example, on stock 2.2, my seek bar (with default values and theme) has an orange color for the selected portion, whereas on a Samsung Galaxy S (with 2.1), it is green. Also the tab background is grey in stock 2.2, but blue in Galaxy S. On a similar note, my rating bar changes size too. I do not implement multiple screen resolutions and all my drawables are located in the "drawables" folder under "res". I donot specify a minimum sdk requirement.
View 5 Replies View RelatedI have two spinners in an activity, A and B. Each spinner uses an arrayAdapter linked to one or more string-arrays from an XML file. I need multiple because B's values are populated depending on what is selected in A.
View 1 Replies View RelatedThis usually happens when the user hits "Home", does something else, then eventually wanders back into the app - it attempts to go back to where it was before, but the application Context has mysteriously lost all its previously-saved state information (in my case, a few integers and a few Strings). I know this is a very vague question, but are there any cases (other than the user using "back" to back completely out of the application) where the application Context gets completely destroyed even though the application is not terminated? Is there a better way to maintain persistent state information?
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