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POUpdating list elements on Spinner list item selection - Android
 

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  1. POUpdating list elements on Spinner list item selection - Android
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    <p>A little context: I have a stable tutorials app on the market. Recently the users have been requesting some external sources where they can learn more. This question is regarding the solution I came up with.</p> <p>I have an activity with a listview and a spinner on top.</p> <p>The listview can be populated with up to 25 elements at once (should I make it lesser?) .... I want the spinner to have options like (1-25, 26-50, 51-75).</p> <p>The default can be set to 1-25. Depending on what the user selects, I need to re-populate the listview accordingly. I reckon a two dimensional array would be the neatest. But I don't want to hinder the performance too.</p> <p>Anyways, here's what I've done yet. I need to know how exactly should I update the listview elements in the Spinners OnClick. </p> <pre><code> Spinner spinner; String path[] = {"Laptops","DesktopPC","Tablets","Add-Ons","Gaming"}; String Laptops[] = {"Dell","Hp","Apple"}; ListView lstView; lstView = (ListView) findViewById(R.id.listView1); ArrayAdapter&lt;String&gt; adapter = new ArrayAdapter&lt;String&gt; (Category.this, android.R.layout.simple_spinner_item, path ); spinner = (Spinner) findViewById(R.id.spinner1); spinner.setAdapter(adapter); spinner.setOnItemClickListener(new OnItemClickListener() { @Override public void onItemClick(AdapterView&lt;?&gt; arg0, View arg1, int arg2, long arg3) { // TODO Auto-generated method stub ArrayAdapter&lt;String&gt; lstAdapter = new ArrayAdapter&lt;String&gt;(getApplicationContext(), android.R.layout.simple_list_item_1, Laptops); lstView.setAdapter(lstAdapter); //lstView.refreshDrawableState(); } }); </code></pre> <p>Assume that I have to switch between the two arrays depending on the spinner selection.</p> <p>Thank you for reading! If you require any more information, kindly ask :-)</p>
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    1. COListViews are made for showing lists of data, which you are trying to deconstruct by adding a spinner to switch between subsections of the list data. Why can't you just add everything to the ListView, then use the spinner if you must to scroll to a particular position in the ListView?
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      1. USKen Herbert
    2. COMy listview is probably going to contain many (200+) items... With performance in mind, I think initializing the entire thing at once would cause lags like nobody has ever seen.
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    3. COI agree with winterblood, I think a better approach would be to to use row recycling on your list view so that the number of items displayed isn't an issue and then if necessary use a spinner or another navigation method to move down the list. Consider how other applications handle long lists (Gmail for example), mainly they make use of either infinite lists, pages (similar to your suggestion), or filters.
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      1. USTheIT
 

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A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

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