I want to know how to change dynamically a ListView's item layout. To be exact, i want to know the method that the ListView's bindView method is called at runtime. if the bindView method is artificially called by a other method. then i will change a ListView's item layout.
View 1 Replies
Code...
I cannot find any information on how to change or hide the background image.
Can I modify android.R.layout.simple_list_item_1? For eg., I want to change the text color of the textview inside the listview dynamically. For this, I need to get to the textview and change its color.. How can I do that?
View 1 Replies View RelatedI'm trying to create a multiple selection list where the selection is represented graphically rather than with checkboxes.My list has checkboxes, but I want them to serve a different purpose. I'm using a cursor to hold my data and created a custom view binder for the SimpleCursorAdapter. I did this for the checkboxes and general flexibility.So far I haven't even been able to show one line as being selected. I've enabled multiple selection on the list and denied the children of the list item focusability. I've tried manually changing background color with the position fed in through the list item click listener. But the wrong items get changed and they don't even change to the right color. I've enabled touch focusability with no improvement either.Ideally, I'd like the trackball highlight focus bar to appear in multiple places. But I don't think this is possible unless you use the drawable directly. But I don't know how to find or apply it. My next idea was to have a slim view bar that changes color. But I had the same problem with the wrong item being selected so I never finished trying to guess the index position to see if this would work. My most recent idea is to completely swap out the view for another one if it's selected. But I have no idea how to do this either. I'm thinking of using an array list to store the _id s of the items that need a different view to get around the wierd selection problem. I'm also thinking of passing in the ID field as my from and the selection view as the to for my adapter. Then I'd intercept it with my binder and change the view accordingly. But once again, I'm not sure how to do this successfuly.
View 7 Replies View RelatedI have a database that gets updated by a background thread. Is is possible for the UI ouput(using a listview) to change when a database entry is added/deleted? I've seen examples of using SimpleCursorAdapter and listViewAdapters and I'm not sure which to use and if it would even work.
I found an "efficient" listViewAdapter which would work great for me since it doesn't call findViewById often and I can change the data structure to hold exactly what I need, but I don't know how to hook it into my database adapter so it dynamically updates the output when there is a database change. Example: http://www.androidsnippets.org/snippets/125/
I have a ListView on my ListActivity and I'd like the rows of the ListView to be 1 of 3 different layouts. The first item in my list is always going to use layout A, the second item in my list is always going to use layout B, and all subsequent items are going to use layout C.
Here is my getView function: Code...
R.id.label1 and R.id.label2 are TextViews on R.layout.layout_A. However, txtLabel1 and txtLabel2 are null after trying to set them. Why?
I stepped through this code in the debugger and it inflated the correct layout (R.layout.layout_A) and fell into the correct case below to set the R.id.label1 and R.id.label2 text. Also, if there is a better way to do this, please let me know.
I have a ListView with different layouts for different items. Some items are separators. Some items are different because they hold different kinds of data, etc.
I want to implement ViewHolders to speed up the getView process, but I'm not quite sure how to go about it. Different layouts have different pieces of data (which makes naming difficult) and different numbers of Views I want to use.
How should I go about doing this?
The best idea I can come up with is to create a generic ViewHolder with X items where X is the number of Views in an item layout with the highest number of them. For the other views with a small number of Views, I'll just use a subsection of those variables in the ViewHolder. So say I have 2 layouts I use for 2 different items. One has 3 TextViews and the other has 1. I would create a ViewHolder with 3 TextView variables and only use 1 of them for my other item. My problem is that this can get really ugly looking and feels really hacky; especially when an item layout may have many Views of many different types.
Here is a very basic getView:
CODE:..........
Suppose I had different types of row layouts, I could have a ViewHolder for each type of row. But what type would I declare "holder" to be at the top? Or would I declare a holder for each type and then use the one for the type of row I'm on.
I have a ListView that is populated using an XML file. However, I want each item, when clicked, to start a new Activity related to that item. I understand how to use OnItemClick to start a Toast that shows the selected item's text. However, since the ListView is populated from an XML there is not a specific Id for each item in the list. So, how would I associate an Activity with each item in the ListView when the items do not have Ids?
View 1 Replies View RelatedI have LinearLayout. Inside to that i have added one more Linearyout ( checkbox & text ).
(LinearLayout) one textView, (LinearLayout) Checkbox,textview , one textview
Now whenever clicks the checkbox, i need to dynamically display EditBox after the checkbox.
code:..........
On the click of checkbox listener i added a code like below.
code:.........
I want to the layout which was added earlier.
I'm not looking for exact code here, just a direction on what to look for and what I should be reading about so I can figure this out. I have a layout that I would like to remain static, with only the listview changing depending on what's selected from the list. I've reloaded data in the list, but I would like the fancy transition animations between choices, and would like the app to go to the previous menu when pressing back.
Someone suggested using a viewswitcher, which seems like it'd be great, but I am still unsure about how to fill a listview in a layout with a regular row layout, then on selection do an animated transition to a custom row. Also, it seems the viewswitcher is limited to two views, so it may be a limitation when I want to go a few menus deeper. Preferably, I'd like to put each menu in it's own class so that I can handle filling it in that class, if possible...
I am not very familiar with android coding so try to help me on a easy way.
The problem:
I have 2 Listviews and a onClick event handler.
How can i find out on which listview the user currently clicked?
public void onListItemClick(ListView l, View v, int position, long id) {
'Approach: if listview1 is clicked then FUNCTION1() else FUNCTION2()'}
I want to decompose my UI into several XML Layouts. The first one would be the main layout, and the other ones would be the content layouts.
I would like to be able to set which content_layout should be included dynamically during runtime, so I don't want to set a "layout="@+layout/content_layout" in my XML file.
Here are my layouts:
main_layout.xml:
CODE:................
content_layout.xml:
CODE:.......
content_layout2.xml:
CODE:..........................
I want to add xml layout dynamically to scrollview in my application . but it is showing error.
This is my code...
I have a custom view (an extension of a TextView) that I want to dynamically add to my Layout (don't want to include it in the main.xml file).
The book says to fetch the RelativeLayout using findViewById() in my java code then create a new instance of my custom view, then use addView on the RelativeLayout to add the new view.
I'm not getting any errors, but when I click my button to add the new view, nothing is happening (view isn't being added). Do I need to set additional properties on my custom view (layout width, layout height for example) in order for it to be shown?
Adding code
CODE:............
My application requires 2 screens and for this I have created two different XML layout files using RelativeLayout. One layout file loads whenever I run my Activity. Now I want to load the second layout on to the same Activity , when user click on a button in OptionsMenu and also when user press Back button the first screen loads instead of exiting the application. So that i don't need to create another Intent in my application.
View 3 Replies View RelatedI am trying to laod the listview dynamically. There are three textviews inside a listview. The text to be set in the textview is fetched from the server. All this is working fine. I am able to fetch the text and am able to display it inside the listview.
The only problem is the position of the textview. The xml layout file is as under:
CODE:.............
If I look at this xml layout in the eclipse layout tab then it is displayed properly. Problem occurs only when the text is fetched dynamically.
I have a LinearLayout defined in XML that I want to use repeatedly to display elements of a list. The XML-layout looks like this:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:background="@drawable/background"
android:paddingBottom="5px">
<TextView
android:id="@+id/destination"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:textSize="22dp"
android:text="@string/test_destination"
android:paddingLeft="5px"/>
<TextView
android:id="@+id/date"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:textSize="15dp"
android:text="@string/test_date"
android:paddingLeft="5px"/>
<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/info"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:paddingLeft="5px"
android:paddingTop="10px" >
I gather information about certain events from a webpage, and then I want to display all events in a list using the above layout for each event. My current approach is to have a LinearLayout as parent and then adding each event as a row.
Problem number one is to add the layout to each event (the number of events is varying). I.e., I want to dynamically inflate this layout for each event. I also don't want the text to be hard coded into the layout (as above) but added at runtime. I don't know how to do this. I have tried something like the following without any success.
LinearLayout eventView = (LinearLayout) findViewById(R.layout.event);
parentView.addView(eventView);
Problem number two is then to add these layouts to the parent view group and display it on the screen. When I try to do this using parent.addView(child), the program crashes at runtime and I can't figure out why.
It's kind of hard to describe the specific problem, since I'm new to GUI-programming on Android and I'm sort of programming by trial and error right now. Anyway, if you are able to help me with some of the problems it would be greatly appreciated. Linus
EDIT:
The problem now is adding text dynamically to the TextViews. I try this:
TextView dest = (TextView) findViewById(R.id.destination);dest.setText("myText");
only to discover that dest is null. Any ideas why and how to fix this?
EDIT 2:
I have narrowed the problem even more, but I really don't understand its nature. This is the trouble-method: Code...
it somehow works (even though the events are displayed in reverse order). Anyone knows what's going on here?
Is it possible for my android application to dynamically adjust the no of column and no of row of my TableLayout based on orientation?
For example, when in landscape mode, the TableLayout is 3x2 and when
in portrait mode, the TableLayout is 2x3?
If I want to dynamically display graphics or text in layout, can I still use xml or I have to hard code?
View 2 Replies View RelatedAs you already know, in Twiiter application, twitt content stays in the right hand side of the Username, and in second line, the twitt content stays back to the left of the parent layout. (which is similar to the Listview item's layout of Facebook Application)
My problem is the username and twitt content belong to 2 different columns. Could you please tell me the way to fix the problem?
i have tried almost everything i can think of to center a programitacally created table in a pragmatically created layout. I've tried all the usual layout params center setting but still nothing: Score List is a set of pairs of scores (Name, Score). I'm just looping through and adding them to cells in a table and its always aligned left when i run it.
ArrayList<Score> scoreList = new ArrayList<Score>();
public LinearLayout getHighScoresView(Context context) {
final RelativeLayout.LayoutParams layoutParams = new
[code]....
after figuring out the earlier question 'Layout Question', now my OnItemClickListener, and ItemLongClick Listener(ContextMenu) have stopped working. With just the TextView it works fine Anyone have any ideas as to why this would stop working?
Is it possible use the merge tag in the layout XML for a List item? In particular, when using a SimpleCursorAdapter?
View 6 Replies View RelatedI am creating a layout dynamically when the activity first starts, the problem is when the screen is rotated it is hitting the database again to create the layout. How can I save the layout so it isn't recreated each time the screen orientation is changed?
View 5 Replies View RelatedI have a ListView whose rows are formatted by me. Each row has a mix of ImageView and TextView. I have also implemented my own adapter and am able to draw each row through it.
Now, I would want something like this-
User clicks on an ImageView (not anywhere else on the row, but only this ImageView should respond to clicks)
I get to know the position of the row whose ImageView was clicked.
I have tried many things for this and have wanted my code to be as efficient as possible (in terms of overkill).
Currently i can capture the click event on that particular ImageView only, but I can't know which row was clicked.
I have provided an attribute in the Row XML like this-
CODE:..................
And in my code, I have a method like this:
CODE:..............
I can get the parent row (perhaps) but am not sure how to go further from here.
Context Menu seems quite handy as long as we are using an AdapterView as we can easily get selected item position in onContextItemSelected from AdapterContextMenuInfo.position Any idea how we can achieve something similar in a TableLayout? In my TableLayout, i have some TableRow and i would like to get the row index in the onContextItemSelected callback like i would do with a simple ListView. I guess i will have to register the contextmenu for each row? but how can tie the row index with the menu? i see no way to do it with registerForContextMenu.
View 2 Replies View RelatedI am using a ListView to display my custom item layout, which may contain some TextViews and an ImageView.
This is the item layout I made (post_item.xml):
CODE:........................
I don't put the ImageView initially in the xml layout, but I will insert it when I need to the FrameLayout programmatically (I also put another views in it when needed). So, there will be some items which has ImageView in it and which don't.
I get the image to fill the ImageView from the Internet (through URL), decode it as Bitmap, and keep it as a Bitmap variable in a class represents the custom item layout (class PostItem).
When the activity shows for the first time it looks fine, but as I scrolled through the items then a problem showed up, the items which shouldn't show any image show the image from the other item which should, although they don't have any ImageView (because I didn't insert it).
I am using SDK 1.6 and the emulator. Haven't tried it in real device because I don't have it.
Here is my code for the Adapter:
CODE:..............
And this is the code to prepare the items:
CODE:.........................
Is this the bug in the emulator or there is some mistake in my code (probably memory problem for the Bitmap)?
How to delete an item from a ListView.
I have a layout which includes the listview, an edittext and a button. On button click, the edittext's string is added to the listview. Clicking on a listview item opens a dialog which asks for confirmation to delete that item. When confirmation is received, the item appears to delete. But when the delete button is clicked on another item, the item deletes, but the previous item reappears in its spot. From my limited understanding, I assume that the item doesn't delete from the SharedPreferences, and so when they are loaded again, the item reappears. I've tried clearing the SharedPreferences before saving after delete, but this didn't work (though I could've been doing it wrong).
I've included the whole class incase to test it out in IDE. I understand there are a lot of unneeded objects and the code is quite messy which is a result of me screwing around with the code to try and get this to work. Though everything works as it should, aside from deletion.
[HIGH]
package com.example.send2omni;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
[Code]....
And here's the layout to save some time:
[HIGH]
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
androidrientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
[Code]...
CODE:...................
This is the layout that I am inflating in the Adapter. Everything is displayed, but only the second textview which should be displayed at the bottom is getting displayed at the top. Can someone let me know the problem with this?
I I view this in the layout tab in Eclipse then it displays properly. The problem occurs only when the text is fetched dynamically.
I have three tabs in my Application. On an event under one Tab, i want to change the title of an another existing Tab. This is the title that we provide while adding the tabs to the TabHost.
Eg: TabHost.addTab(tabHost.newTabSpec("Tab2")).setIndicator("I need to be Changed dynamically").setContent....
In the above example, the title of the tab2 that i provided under setIndicator(), should be changed dynamically.
Is there any way to accomplish this.