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19905401
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2013-11-11T11:37:42.563
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2013-11-11T15:43:03.913
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2013-11-11T15:43:03.913
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<p>Here is a code sample that retrieves contacts from a SQLite database asynchronously using the async/await implementation of dot42. I omitted the SQLite code. <code>ContactsDatabase</code> inherits from <code>SQLiteOpenHelper</code> and implements the usual methods.</p> <pre><code>using System; using System.Threading; using System.Threading.Tasks; using System.Collections.Generic; using Android.App; using Android.Os; using Android.Widget; using Dot42; using Dot42.Manifest; [assembly: Application("SQLiteAsyncSample")] namespace SQLiteAsyncSample { [Activity] public class MainActivity : Activity { private ArrayAdapter<string> adapter; ContactsDatabase database; int i = 0; protected override void OnCreate(Bundle savedInstance) { base.OnCreate(savedInstance); SetContentView(R.Layouts.MainLayout); ListView list = FindViewById<ListView>(R.Ids.list); adapter = new ArrayAdapter<string>(this, Android.R.Layout.Simple_list_item_1); list.SetAdapter(adapter); database = new ContactsDatabase(this); database.AddContact(new Contact("Frank", "012")); database.AddContact(new Contact("Marco", "345")); database.AddContact(new Contact("Hans", "678")); database.AddContact(new Contact("Sergey", "901")); Button addAllButton = FindViewById<Button>(R.Ids.showall); addAllButton.Click += showAllButton_Click; // Set the static synchronization context to the current/latest 'this'. // This allows the code after the wait to resume on the 'current' this // even if the Activity was recycled, e.g. due to a device rotation. SynchronizationContext.SetSynchronizationContext(this); } private async void showAllButton_Click(object sender, EventArgs e) { List<Contact> contacts = null; await Task.Factory.StartNew( () => { // lengthy job contacts = database.GetAllContacts(); }).ConfigureAwait(this); // make sure to access the adapter from the UI thread // so not in the anonymous delegate above foreach (Contact contact in contacts) { adapter.Add(contact.Name); } } } } </code></pre>
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