What's the easiest way to create separate preferences for each item in an Android listview? I found this question, but it's kind of general. Could anyone be more specific, possibly show a quick example?
If you want to do this, you should write some code into your adapter getView method.
You can check the position (with an if-clause) in the method and add a custom desgin/layout depending on the position.
If you use a LinearLayout or RelativeLayout in your ListView item XML you can fill this programmatically in the getView method with all the widgets (edittext, checkbox, etc) you need.
Related
Shockingly there doesn't seem to be any questions that successfully answer this. I am trying to change the font in the AutoCompleteTextView. How can I accomplish this? I'm assuming this would involve creating a custom class that extends AutoCompleteTextView but how would I do this specifically?
You can implement an Adapter and use the setAdapter(...) method to apply it. Adapters are used to serve up and cache views for efficient scrolling in Android. The AutoCompleteTextView will call the getView(...) method on your Adapter giving it the position that it wants. You create or modify a view with the content at that position (in this case the text) and return it.
Here's a good example article of it:
http://www.codeofaninja.com/2013/12/android-autocompletetextview-custom-arrayadapter-sqlite.html
You might just want to scroll to the adapter part.
You are showing the drop-down list. You control the font yourself when your code creates your rows in your Adapter implementation used for suggestions. Override getView() and adjust the font in your TextViews in the row layout.
I'd like to change my listView items dynamically. The algorithm goes like this:
1.I create the default view for my listView using adapter and show it to user. The list item contains Imageview, textview and another imageview which is invisible.
2.The data is beeing dowloaded in the meantime.
3. after my data is downloaded, I'd like to check whether my listview contains any of downloaded items. If yes, I want to make visible the previously invisible ImageView for this item.
Should I add some kind of method to my adapter, call it and then call invalidateViews(), notifyDataSetChanged(), or notifyDataSetInvalidated()? Or maybe there is some kind of standard way to find my adapter's item by Id or sth and then make visible the imageview for this item?
This list update operation is the only one left to implement for me.
Should I add some kind of method to my adapter, call it and then call invalidateViews(), notifyDataSetChanged(), or notifyDataSetInvalidated()?
Yes, exactly.
maybe there is some kind of standard way to find my adapter's item by Id or sth and then make visible the imageview for this item?
Above mentioned way is enough. There is no such standard or special way to do it AFAIK.
Read the Displaying Bitmaps Efficiently introduction and in particular the part about Handle Concurrency. This will give you all the information you need.
I have a ListView which has 3 different types of items, and I want each of these categories to have a different selector. I've accomplished that so far using a different item layout for each category, but I think it's a bit silly, since the only thing that changes between those 3 layout files is the selector attribute android:background="#drawable/cat1_selector"
Isn't there a way to do this programmatically for each item via a method similar to setSelector in the ListView class ?
Thanks !
Or, you can set the selector of the View by Overriding the getView() method of your ListAdapter.
Check more here
My Question is
I have a expandable list view. in the expandable list i have two buttons in each child in the list. Now i can able to add buttons in the child list. But i dont know how to get parent position and child position. with this parent and child values i need to call another activity. I dont know how to use expandablelistadapter and onChildClick method. Can anybody explain with example. Because am new to android.
You wont get source code implementation as this is not a "gimme-teh-codez" website. Please try to ask questions more specific or tell us whats the problem with your source-code. You can use pastebin.com to direct us to your source code.
I shall point to some links that will help you get started:
Check out : An example showing how to use the child position
and ExpandableListAdapter
Expandable lists have groups which contain children
The solution won't differ from simple ListViews, so you can take a look at something like this article. Basically, when you define your views in getView() (or in case of expandable lists in getChildView()), you define click listeners for the buttons with setOnClickListener(). You use the button's setTag() method to set necessary information like its position and then read it inside the listener with getTag().
I want to generate a ListView that has some dividers between some of the entries, like it can be seen in some of the property sections. See the example below. I try to generate a List that consists of some textviews followed by one of the fancy dividers explaining the next part of the list and then again some text views. How can this be done? I thought about creating different views to add to the list? Is this the way to go?
I got a solution. I don't know if it is the best one.
I use a custom adapter derived from ArrayAdapter for the list as described in this tutorial. In the adapter class I check if the position in the getView method is a normal row, then I inflate the row layout. If it is the first row from a new group I inflate a headline layout that is a normal row plus the group headline above it.
If you don't want to mix the header into one of your rows. Consider the following solution:
You can overwrite the two methods getItemViewType and getViewTypeCount.
You now have a list that can display different rows. You need to check the expected view type for the item in the getView Method and inflate different layouts depending on it.
The list will handle the recycling for you in a way that it will return only correct recycle views to your getView method, this means if the recycleView is not null it can be used to display your current cell.
You can use my SectionedAdapter, if GPLv3 is acceptable (licensed that way due to some upstream code). You can use my MergeAdapter, if you need something more flexible and with a less-limiting license (Apache 2).
I think you might be looking for android.widget.ExpandableListView
http://developer.android.com/reference/android/widget/ExpandableListView.html
I'm also interested in an answer to this. There must be a more straightforward way to do this.
In looking at the Adapter, there's a method, Adapter.getItemViewType(int position).
ListView defines a return value, ITEM_VIEW_TYPE_HEADER_OR_FOOTER which indicates if the returned item is a header or footer.
I haven't tried it, but I assume if you create your own Adapter and return an item with the type indicating it is a header or footer, that the ListView will display it appropriately.