Android :: Custom Grid View With Array Adapter Out Of Sync With Backing Data
Oct 28, 2010
I'm have a custom GridView Array Adapter. The problem for me is that when the grid list gets large enough to scroll off the screen the gridview and arraylist get out of sync. For instance in my case I have code that checks if an actor is of type director the text color should be red. if you scroll up and down my list enough times all the actors text in my gridview will become red. The thing is that the Gridview appearance actually looks fine its the backing data. Here is the complete class. In the code you can see where I tried to override getItem and getItemId but that didn't fix anything. Code...
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Aug 10, 2010
I must be missing something simple here.I've searched around but don't think my search query is touching on the right topics to yield results. Anyhow, what I'm after is running through the array of data I bind to a ListView after a "Submit" button has been clicked.
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Jan 31, 2009
I want to create custom View showing possibly several items. i think using Adapter interface would be good idea.
My question is: should i extend AdapterView? if so, what is the most imortant when doing this (e.g. AdapterView is ViewGroup, so how should i manage children)?
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Dec 7, 2009
I have implemented a custom adapter the extends from the BaseAdapter and implements the getView method. It works fine except for one thing, not once do I get the convert View (a parameter to the getView method) that is not null (that can be reused).
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Mar 25, 2010
I have a ListView with a custom Adapter that extends ArrayAdapter. It's ArrayAdapter of Type Artist. (There are about 1200 artists in my list). Artist is a very small class that has a name and an id. The Artist Class has toString() overridden to return just the name. I have an EditText. The EditText has an TextChangeListener where I call .getFilter().filter(chars, callback) on my adapter. In the Filter.Filterlistener().onComplete() callback i print the count and it looks really good. As i type the count decreases. So it seams everything works as advertised, but the List stays the same. I tried to call artistAdapter.notifyDataSetChanged() to force the list to redraw, but nothing happens. [see 2.)]. I am tinkering around for days now! I am desperate. Hopefully someone can have a look on my code and tell me what I am doing wrong! How can I force the list to be redrawn?
Here is what I have done:
1.) Defined a ListView and an EditText like this:
<EditText xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/list_search_text"
android:layout_width="fill_parent"
android:layout_height="35dip"
android:layout_below="@id/header">
</EditText>
<ListView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/list_search"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
</ListView>
2.) Setup my ListView in the Activities onCreate():
private ListView listView = null;
private ArtistAdapter artistAdapter = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.search_artists);
artistAdapter = new ArtistAdapter(this, R.layout.row, list); // 'list' is an ArrayList<Artist>
listView = (ListView) findViewById(R.id.list_search);
listView.setAdapter(artistAdapter);
listView.setFastScrollEnabled(true);
listView.setTextFilterEnabled(true);
listView.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> av, View v, int position, long id) {
// do something } });
EditText txtSearch = (EditText) findViewById(R.id.list_search_text); txtSearch.addTextChangedListener(new TextWatcher() {
public void afterTextChanged(Editable arg0) { }
public void beforeTextChanged(CharSequence arg0, int arg1, int arg2, int arg3) { }
public void onTextChanged(CharSequence chars, int start, int before, int count) {
artistAdapter.getFilter().filter(chars, new Filter.FilterListener() {
public void onFilterComplete(int count) {
Log.d(Config.LOG_TAG, "filter complete! count: " + count);
artistAdapter.notifyDataSetChanged();
}});
}});
}
3.) This is my ArtistAdapter in short. I added an remove() and add() method:
public class ArtistAdapter extends ArrayAdapter<Artist> implements SectionIndexer {
private List<Artist> items;
/* other stuff like overridden getView, getPositionForSection,
getSectionForPosition and so on */
@Override
public void remove(Artist object) {
super.remove(object);
items.remove(object);
}
@Override
public void add(Artist object) {
super.add(object);
items.add(object);
} }
4.) My artist has also the toString() overridden:
public class Artist implements Comparable<Artist> {
public String uid;
public String name;
public Artist(String id, String name) {
this.uid = id;
this.name = name; }
public int compareTo(Artist another) {
return this.name.compareToIgnoreCase(another.name);
}
@Override
public String toString() {
return this.name;
} }
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Jun 2, 2009
I developed a List View with a custom adapter (which extends Array Adapter). The problem is that i can't selected or highlighted items. Is there a attribute to fix in the list View Layout or something else?
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Oct 13, 2010
I've got a schedule Class, which is simply a custom ViewGroup (with custom onMeasure() and onLayout()), which enables me to place childs(=events) with LayoutParams for column/row start and column/row end. The number of childs and their LayoutParams depend on database entries.
Now I'm trying to add childs (events) from my database. I'd have to use a Cursor Adapter, so my schedule Class has to extend ListView, right? I tried that but the newView() method of the adapter is never called. Why not? My custom ListView doesn't ask the adapter for childs, no childs are added. I also can't add the childs by hand calling schedule.addView() if I extend from AdapterView.
How can I add events to the schedule with the data from the cursor?
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Sep 13, 2010
When creating a custom account and/or sync adapter, raw_contacts that belong to your custom account can be created. But it looks like that they then cannot be edited with the Contact app! Is this a known limitation, or a problem in my code?
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Jun 19, 2010
I have a simple grid with rows of items and columns of options on each item. Of course I can manually link OnClick actions to cell items through specific resource IDs:
CODE:.............
What I'd prefer to to is use a ListView or a GridView and an Adapter. Is there a way to get cell id's from one of those? I was hoping that ListView setOnItemClickListener() would call me with the view id of a view within row 'position': onItemClick(AdapterView parent, View view, int position, long id) { ... }
But no go. Maybe a different approach?
Update:
I started with this:
CODE:.............
I'd assumed that I couldn't go into my Adapter and set child view OnClickListeners. Bad assumption. When I went back at this I gave it a try:
CODE:.................
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Mar 1, 2010
I have an ArrayAdapter (myAdapter) attached to an AutoCompleteTextView (textView)component. Once the user presses a character I would like to populate AutoCompleteTextView's drop down list with items containing this character. I retrieve the items using AsyncTask (which uses a web service).
I call myAdapter.add(item) but the drop down list is empty.I added a call myAdapter.getCount() after each addition and it shows zero every time.
Calling notifyDataSetChanged() didn't help.I even tried to add simple String objects instead of my custom objects, to no avail.What am I doing wrong?
Edit: I changed the code as miette suggested below but still to no avail.
Generally, what I do is after text is changed in my auto complete text view, I call a new AsyncTask and pass it the entered text and a Handler (see afterTextChanged()). The task retrieves objects relevant to the text and once done the Handler's handleMessage() is called. In handleMessage() I attempt to populate the adapter's objects. But still the adapter's drop down list ends up empty.
Here is my code:
public class AddStockView extends Activity implements OnClickListener, OnItemClickListener, TextWatcher {
ArrayAdapter<Stock> adapter;
AutoCompleteTextView textView;
Vector<Stock> stocks;
public AddStockView() {
// TODO Auto-generated constructor stub
stocks = new Vector<Stock>();}
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.add_stock_view);
findViewById(R.id.abort_button).setOnClickListener(this);
adapter = new ArrayAdapter<Stock>(this,
android.R.layout.simple_dropdown_item_1line, stocks);
//adapter.setNotifyOnChange(true);
textView = (AutoCompleteTextView)
findViewById(R.id.search_edit_text);
textView.setAdapter(adapter);
textView.setOnItemClickListener(this);
textView.addTextChangedListener(this);} Code...
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Jun 18, 2010
I have seen examples implementing a custom Filter. The Android developer docs talk about implementing a Filterable interface. Does anyone have any advice and/or sample code on the best way to implement filtering in a ListView ?
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Nov 3, 2010
Often, a simple of ArrayAdapter does what I want and during early development I will provide the android.R.simple_list_item_1 for the view id required by the ArrayAdapter constructor. Is it possible to provide a customized view which is based on the android.R.simple_list_item_1 to the ArrayAdapter constructor?
I do not fully understand Android's 'include' functionality, but what I would like to do is something like:
Define a new TextView based on customizing the android.R.simple_list_item_1.
(I have no idea what the valid syntax would be)
code...
Reference my customized TextView. I assume that something like this would go into my layout directory. Then in my code I would do something like:
LayoutInflater inflater = (LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View view = inflater.inflate(R.id.MyTextView, null);
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, view.getId(), myArrayOfData);
Is this possible and if it is, what is the appropriate syntax to accomplish what I want?
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Jan 14, 2010
I have a problem and i will be grateful if anyoune helps me.
Ok. I've started android programming 2 month ago. Now i am developing a simple game, nava battle. For this programm i need to build a grid, where i can place ships and coordinates. I can't seem to find out how I should be doing this?
I think i should build a custom view, which will do all that i need. If anyone could show some examle or explain how to build appropriate view i'll be happy
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Jun 19, 2010
I have a GridView that displays thumbnails of images, I want to change the thumbnail size (zoom in/out) during runtime, what is the best way to achieve this? I changed the columnWidth of gridView during runtime but after that I scroll the gridview and I get memoryoutoferror exception.
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Sep 8, 2010
I want to add scroll bar in gridview,How can i add scroll bar in grid view?
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Aug 9, 2010
What I want is a central column using Grid View, but everything I try does not work. It always aligns to the left. I have tried messing around with layout_gravity and gravity to no avail. I have a Grid View in a Linear Layout:
<Linear Layout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent".
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Jun 26, 2010
I have a GridView of 9 rows of which the first one is sort of "header" row.As there are 8 more rows they flow beyond the end of screen and need to be scrolled down to.However this scrolling also causes the first row to go "off-screen".Was wondering if there is any way I can prevent the first row alone from being scrolled off?I dont want to make this a separate LinearLayout as it is part of a dynamic View (the GridView) that I create at runtime.
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Aug 9, 2010
My xml code is...
But there appear to the right of the gridView a blank. Its size seems for scroll bar. I don't know how it comes. Can anybody help me?
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Jul 29, 2010
I want to display the grid view elements in only one row that means i want horizontal scrolling in grid view.Each time i want to display only 5 elements only in one row.
Below is the my layout code
CODE:.....
In that above code now i want to remove the that 2 image view and set the horizontal scroll to that grid view elements.For this give me some suggestions,Thanks in advance
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Oct 18, 2010
I'm implementing my own sync adapter and everything works great. A strange i'm having is that after the sync is over, the Android still shows the sync icon (the one with the rounded arrow) in the account activity, and that someone (i guess its the account manager) repeatedly calls the sync again and again, every 30 to 60 seconds. Now i tried all sort of things to test this issue and i have discovered something strange. In my code, i do resolver.applyBatch every 50 new rows. (each new contact i sync has about 5 rows). If i remove the applyBatch (which means i retrieve the data from the next, sort it and prepare it, but never "commit" it) - the problem goes away. The icon disappear and the account manager never calls it again on its own (I'm using Android 2.1). I must also state that no exception is being thrown in any of the cases and that all the methods finish gracefully.
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Aug 4, 2010
I want to display the number of images according to one number.That means if number is 1 i want to display only one imageview in grid,if number is 3 i want to display the 3 images in grid .But i take only one image that means depending on the number that image will be displayed.
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Jul 17, 2010
Hello. I can't understand how this works in Android. I traversed samples and have no idea. For instance I need 2x2 grid view of TextView widgets. How to write needed code?
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Aug 25, 2010
Create Footer in Grid View For Android.
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Oct 9, 2009
GridView is not behaving like it is supposed to.
This screenshot shows that the GridView (in landscape mode) is flushed left.
I want it centered. This is the XML layout for the GridView.
<Linear Layout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/templatelandscape"
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="wrap_content">
<GridView
android:id="@+id/commandsbarlandscape"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1.0"
android:layout_alignParentTop="true"
android:layout_centerInParent="true"
android:padding="0dp"
android:verticalSpacing="2dp"
android:horizontalSpacing="2dp"
android:numColumns="auto_fit"
android:columnWidth="52dp"
android:stretchMode="spacingWidth"
android:gravity="fill_horizontal">
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Jan 23, 2009
Not allowing horizontal spacing between grid view item, I am using following for grid view, I don't want horizontal space between grid view item. android:horizontalSpacing="0px"android:verticalSpacing="0px"
By using this there no vertical space between item. But the horizontal space remain there, how to eliminate this horizontal space between grid items.
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Sep 11, 2010
My purpose is to set headers for related items of grid view and for this i am thinking about to set the width of grid view different for header and sectional view's.if any other way 2 set sectional header for related items is possible?
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Sep 5, 2013
I have 20 items in an grid view.
If I click any item in an grid view,how should I make that item non clickable?
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Jul 14, 2010
Is there a way to re-arrange the applications list in grid view in alphabetical order?
If I switch to "list view", they are in alphabetical order, but in grid view, they are not. I could not find a way to do it.
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Apr 8, 2010
My background is in C, but I'm relatively new to Java and to Android. I have a question as to whether I'm implementing code in the best way:
As a learning exercise in Java and in meeting the Model-View- Controller pattern, I wrote a simple game. It plays out on a 2D grid owned by the game class, and is drawn to the display by an extended View class. I have it working, but I'm wondering after the fact if I'm going about it the right way.
Here's a simplified version of what I have:
CODE:.................
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Jan 31, 2010
How do I set row height if text of some rows more than one line when writing custom ArrayAdapter?
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