Android :: Changing Image On Listview At Runtime?
Jun 3, 2010
I am using a LinearLayout to display some Text and image. I have the images at drawable/ and i am implimenting this with ListActivity with some onListItemClick functionality. now i wants to change the image for the rows which are processed by onclick functionality to show the status as processed. can some one help me in this issue to change the image at runtime.
The following is my implimentation.
CODE:.........
And main.xml is :
CODE:.........
I thought to add the field to DB. but i was unable to know how to change the image with code. can any one provide me an example for drawing image with code and change it based on a condition at runtime.
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Sep 9, 2010
I have an application where I would like the users to be able to change the theme. Currently my layout have elements like this: <LinearLayout android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" android:background="@color/background_transparency"> what I would like to do is to change to a new colors.xml that has a different value for "@color/background_transparency" if the user selects one of the themes available. Alternatively to be able to change the value of "@color/background_transparency" in code.Is this possible? Or am I doing this the wrong way.
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Aug 30, 2010
How to add items to a ListView in Android during runtime?
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Feb 8, 2010
I currently have a ListView being filled by a custom Adapter with content it gets from a JSON string on a web page. The ListView's row layout is a LinearLayout that has two things in it, one AdMob layout and one TextView. The AdMob layout's visibility is by default set to Gone.What I want to do make every 5th row's AdMob layout visible. The current way I am doing this is by Overriding getView in my custom adapter (something I already had programmer to get my rows to have alternating colours), within this I keep track of the position variable and see if I have moved down 5 rows yet. When I have I find the AdView object and set it to visible. This works fine for a while but for some reason as I scroll down more on my list the ads become every other instead of every five. This doesn't make any sense to me because I have set up logcat to tell me when it reaches my "make ad visible code" and according to that I should not be having double ads. Has this happened to anyone else before? I'm not quite sure how to handle this situation.
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Jun 1, 2009
I have a ListView containing a few different type of items, all having their own background image and font color. In my first implementation I implemented each type of item as its own layout with the background image etc defined in XML (and implemented Adapter.getView() so that it only reuses convertView if it's of the correct type). This works fine but the performance is not that great while scrolling since I'm inflating quite a few Views due to convertView mismatches, so instead I tried using the same layout for all items (to benefit fully from convertView reuse) and changing the background image and font size in runtime. I even keep the three background Drawables I need as members to save time decoding them from a resource for each item, and call View.setBackgroundDrawable() from Adapter.getView(). The problem is, sometimes the 9-patch is not correctly wrapped around the content of the list item when using this approach. While scrolling it usually looks correct but when the scrolling stops, or sometimes when I just tap anywhere on the list, the background 9-patch of some large items starts flickering and is either cropped or resized to its original PNG size rather than stretched to wrap the content.
First of all, I suspect this is a bug? Any ideas why this happens? Could it be that the View is not always measured to reflect the changed content when the 9-patch is applied? I have tried adding an extra call to View.invalidate() but it doesn't solve the problem. Second, does this approach sound reasonable at all, or how should I go about to optimize this scenario?
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Dec 30, 2009
Does the android listveiw has the method to achive this goal?
I woluld like to implement the function like listview in C# or vb,The users can adjust the
column width by themselves.
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Mar 4, 2010
I have to insert, at runtime, an image in an ImageView. I haven't it in local, but i can get it from an URL.
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Jun 14, 2010
I am getting a run time exception
java.lang.RuntimeException: Your content must have a ListView whose id
attribute is 'android.R.id.list'
I don't know what is wrong> code...
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Apr 19, 2010
Set the image background path as package:imageName Example. At runtime , my package is com.test.android .Inside that i have an image whose path i want to mention in the XML layout file as android:src = com.test.android/img1 for an ImageButton.I saw an SDK reference for ImageView as android:src = @[+][package:]type:name.But i am not getting how to use it.I think it must not be possibe , but if there is any way , please specify.The reason why i want to do this is that,when i specify a drawable at runtime for my image buttons, i change the images according to Focus received, or onKeyup, KeyDown.. but its not working as expected.When i mention the same thing as style under drawable, it works fine. So if my theme is going to change at runtime, i want to set the drawable at runtime, keepnig the path same in the xml.
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Aug 9, 2010
I have a card game I created in android and it is possible to show the scores at any given time by clicking a menu option. I would like that scores dialog to show a different background image when it's loaded depending on factors like who's leading, etc. In my constructor, I have the following relevant code:
public ScoresDialog(Context context) {
super(context);
this.setTitle(R.string.scoresDialogHeading);
setContentView(R.layout.scores_view);
...
}
I have tried getting that view to change it in the showDialog method i wrote like so: findViewById(R.layout.scores_view).setBackgroundColor(Color.BLUE); However, I got a NPE... I tried moving this statement to the onStart method, thinking that the view is not yet initialized but got the same error... Any thoughts on what the right way to do something like that is?
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Oct 16, 2009
How we can store image files(*.png) to the folder R.drawable at runtime?
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Jul 4, 2010
Alright, so I followed a tutorial on the Android website, and I got a ListView going in my application. But, the example they had did everything in Java basically. How could I transform the following code to XML?
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Jun 10, 2010
I have added a menu to ListView Activity and wanted to allow the user to select the information that would be displayed in the ListView. So for example:
The ListView is populated in the onCreate method.
The user selects an option in the menu.
Upon the user making this selection the ListView would be populated with a different array.
Is onResume() executed after the menu is closed? I would test this but I am not currently home.
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Sep 23, 2010
I have created a tabbed view with four tabs and attached four listviews to the tabs. I have created separate classes with the list views in them and I now want to add a activity to the list view
CODE:.........
I have 24 teams in the listview and I have created a class for each one, but how can I make it so that when the user selects the team in the list it goes to the class in question i.e bury,bradfdord accrington ect.......?
What method should I use and how do I implement it.
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Apr 7, 2010
I have Activity with ListView inside it and in the onCreate method of the Activity I have code for populating the Data of the ListView this Data is a server based and so populating includes calling Network URLs. I have the ArrayAdapter of the ListView in the Same Activity Class.
Now the Issue I'am facing is that, in Rest all scenarios my Activity is behaving in a proper way but when the Orientation [ Portrait to Landscaped or other way round] is taking place the Data is Getting lost and Newer Data calls are Required to Populate the Same Old Data now this is something that is not intended out the code how should I deal with it.
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Feb 7, 2010
How can I change background color of ListView items on a pair-item basis. When I use android:backgroundColor in the ListView item layout I can achieve this, however the list selector is no longer visible. I can make the selector visible again by setting drawSelectorOnTop to true but then the selector overlays the whole item.
Any ideas how to change those background colors and keep the selector?
I would rather not change the selector itself.
Authors of GMail application have managed to achieve exactly this so it's definitely possible.
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Sep 3, 2010
CODE:.....
list_item.xml
CDE:......
The problem is that I want to set a new typeface for the TextView in the ListView, and it seems it can't be done in the XML file!
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Sep 12, 2010
i've got this simple layout in a file derived from Activity
<?xml version="1.0" encoding="utf-8"?> <ScrollView xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:padding="10dip" > <ImageView android:id="@+id/photo" android:layout_width="wrap_content" android:layout_height="wrap_content" /> </ScrollView>
i'd like to change the imageview contents dynamically. which method do i need to overload - again this class is derived from Activity.
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Oct 29, 2010
I can't seem to get a customized divider, using a Drawable I've defined, to work when using a ListActivity and not creating a custom ListView. It almost seems like when the VM creates its own ListView for me, with the ListActivity, it uses a theme with the default divider provided; and if I try to provide one, no dividers appear in the ListView at all.
I know that I can create a custom ListView using XML and define android:divider on that ListView, and this does recognize my custom divider Drawable. But I would prefer to just let the ListActivity create its own ListView, if I can figure out how to get my own divider working on it.
Here's the code I'm using now:
CODE:............
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Aug 19, 2010
I have created an activity that extends ExpandableListActivity class.
I want to customize the look and feel of my expandable list activity. I have achieved the customization of list selectors.
What i want next is to change the default "expandable arrow" image that comes.
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Sep 15, 2010
I am running into a very weird thing. I have an ImageView, and when I call setImageURI with an image, it seems to change the size of the image view.
CODE:..............
The default image is 195 x 195, i am trying to set the image to be 200 x 200, after setting the image using setImageURI, i get the dimensions back and it says it's 48 x 48.
I have tried a bunch of different android:scaleType parameters, and I couldn't find anything that worked.
I also tried explicitly setting the size (layout_width="200px") and it seems to work.
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Sep 16, 2009
Over the past few days I have been trying to implement custom widget functionality. In this case I have instantiated a RemoteView containing some TextViews and an ImageView in one application's BroadcastReceiver. The BroadcastReceiver receives the intent signaling it to send the RemoteView to the calling application. When the calling application receives this RemoteView it uses apply to inflate the view properly and display it on the screen.
The problem occurs when the activity changes, the inflated RemoteView occasionally has information disappear. One time the image even changed into another image from a drawable located in the BroadcastReceiver's application. Has anyone else experienced a similar problem and/or have a solution?
I have looked at posts concerning ImageViews in widget use and orientation changes. Is this problem related? I am not entirely sure. I am currently running Android 1.5 SDK and am not able to upgrade for this side project of mine.
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Apr 14, 2010
Creating a game in Android using multiple Buttons to display an image from the drawable folder. I want to change the button to a different image after the button has been clicked on.
Here is the button code:
CODE:.............
I can't find anything about how to change the actual image of the button. You can change the color of the button by using the following code in the java file: b36.setBackgroundColor(0xAA00AA00);
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Sep 3, 2010
I have a ListView populated via a CursorAdapter. I give my user the ability to alter the data in the list. For example, the user can mark a row as being unread (the data are messages).
Suppose my user marked a row unread. Would a proper implementation mark the row in the database as read and then requery the Cursor?
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May 5, 2010
I am having an EditText. If i specify image for the EditText in the layout XML file (android:back ground) it looks different and looks different when i specify it at runtime EditText et = (EditText)find ViewById (R.drawable .et1) ; et.setBackgroundDrawable (Main.themes.getDrawable (EDRAWABLES.EditText BackgroundImage )); Both codes point to the same image. When i specify the image at runtime , the EditText leaves a margin at the top and bottom of the cursor in the edittext which does not happen when i do it in XML. I have attached the screenshots of both images. Top image is the one drawn from XML and bottom one is given at runtime. I am not getting the difference ? Actually i am facing similar problems with other Widgets too if i change the logic of specifying the drawable at runtime and not at compile time.. Is this the default SDK behaviour? You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscribe@googlegroups.com For more options, visit this group at http://groups.google.com /group/ android-developers? hl=enEditTextProblem.JPG
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Sep 8, 2010
In the emulator on touching my button I want its image to be changed. I just want to bring my mouse pointer there, without click. This can be observed for other keys of the emulator. On touch a blue image appears on the keys.
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Aug 28, 2010
How to add Image in ListView.
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Nov 17, 2010
Like the title says, is it possible? My purpose is to make a little logo on top of the ListView centered in the view pane
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Mar 14, 2012
In my xml layout I have a button and an image inside the button to the right.I used:
Code:
android:drawableRight="@drawable/checkmark
Let's say I want to change the image to an X and my button in my java code is named button1.How whould I change the image?I know how to change the background using:
Code:
button1.setBackgroundResource(R.drawable.X)
But I can't find out how to change the image to the right.
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Oct 29, 2009
ListView Question! I know it's possible change the row color, but it's possible to put some imagem on background? And if yes, it's possible to create an imagem 1px and repeat-x or repeat-y like CSS?
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