ADD TAGS TO LISTVIEW ANDROID STUDIO HOW TO
In order to understand how to make the listview have the best performance and see in practice how and why it works as i've talked about, watch this video:Īs for tags, i think you want to do something else, since the data itself (usually some sort of collection, like an arrayList) already knows where to update, because you get the position via the getView. įor example, if you scroll down, the upper view becomes hidden for the end user, but in fact it becomes the exact same view that is on the bottom. if the user scrolls, the view that becomes hidden is recycled and given back to you on the getView, to be updated with the data of the one that is shown instead. So, if there is an empty space on the listview, it will be filled with a new view.
ADD TAGS TO LISTVIEW ANDROID STUDIO UPDATE
google thought of it and provide you the means to update only the views that need to be shown at any specific time. you don't want to really create tons of views too, since that would take a lot of memory.
Suppose you have tons of items that can be viewed. i will try to explain it in a simple way. Or is there a better way to link IDs with each string like this than adding tags like I'm trying to do?Ībout getView, it works by using a method of recycling views. Is there any way I can get access to and modify each of the Views with a tag? One idea was to create my own extended class of ArrayAdapter and override the getView() method, but I don't really understand how it works and how I would go about doing this. The names variable in the ArrayAdapter parameters above is an ArrayList, and each string value in this list also has a unique ID that I want to link to this string somehow. Right now I'm creating the ListView like this: final ListView listview = (ListView) findViewById(R.id.listView1) ĪrrayAdapter adapter = new ArrayAdapter(this, android.R.layout.simple_list_item_1, android.R.id.text1, names) I was hoping this could be done by setting a tag to each View item in the ListView using setTag() when these Views are being created. I have a ListView where I want each item to have an ID number attached to it (not the same as the position number).
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