Samples.XamarinAndroid

Samples.XamarinAndroid

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ListViews and Adapters

• https://github.com/android/platform_frameworks_base/tree/master/core/res/res/layout

• http://arteksoftware.com/androids-built-in-list-items/

• http://androidapi.xamarin.com/?link=T:Android.Widget.ArrayAdapter http://developer.xamarin.com/guides/android/user_interface/working_with_listviews_and_adapters/part_2_-_populating_a_listview_with_data/

• in Xamarin.Android

  • id: Android.Resource.Layout.SimpleListItem1
  • simple_list_item_1.xml .

1. ListActivity with ArrayAdapter public class Main : ListActivity { protected override void OnCreate(Bundle bundle) { base.OnCreate(bundle); var items = new string[] { "Vegetables","Fruits","Flower Buds","Legumes","Bulbs","Tubers" }; ListAdapter = new ArrayAdapter ( this , Android.Resource.Layout.SimpleListItem1 , items ); }

   	protected override void OnListItemClick(ListView l, View v, int position, long id)
   	{
   	   var t = items[position];
   	   Android.Widget.Toast.MakeText(this, t, Android.Widget.ToastLength.Short).Show();
   	}
   }
   

2. ListActivity with ArrayAdapter

3. Activity with ListView with ArrayAdapter

   	<?xml version="1.0" encoding="utf-8"?>
   	<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
   		android:orientation="vertical"
   		android:layout_width="match_parent"
   		android:layout_height="match_parent">
   		<ListView
   			android:id="@+id/instructorListView"
   			android:layout_width="match_parent"
   			android:layout_height="wrap_content" />
   	</LinearLayout>	
   	
   	public class MainActivity : Activity
   	{
   		protected override void OnCreate(Bundle bundle)
   		{
   			base.OnCreate(bundle);
   
   			SetContentView(Resource.Layout.Main);
   
   			ListView instructorList = FindViewById<ListView>(Resource.Id.instructorListView);
   			instructorList.ItemClick += OnItemClick;
   
   			instructorList.Adapter = new ArrayAdapter<Instructor>(this, Android.Resource.Layout.SimpleListItem1, InstructorData.Instructors);
   		}
   
   		void OnItemClick(object sender, AdapterView.ItemClickEventArgs e)
   		{
   			Instructor instructor = InstructorData.Instructors[e.Position];
   
   			AlertDialog.Builder dialog = new AlertDialog.Builder(this);
   			dialog.SetMessage(instructor.Name);
   			dialog.SetNeutralButton("OK", delegate { });
   			dialog.Show();
   		}
   	}
   

4. ListView with Adapter public class Main : Activity { protected override void OnCreate(Bundle bundle) { base.OnCreate(bundle); var items = new string[] { "Vegetables","Fruits","Flower Buds","Legumes","Bulbs","Tubers" }; ListAdapter = new ArrayAdapter(this, Android.Resource.Layout.SimpleListItem1, items); }

   }
   

1, 2 often in your class Activity OnCreate call, and call the button object has already been initialized. Method 1: use the delegate button.Click += delegate { button.Text = string.Format ("{0} clicks!", count++); }; Method 2: use Lamda expressions button.Click += (sender, e) =>{ button.Text = string.Format ("{0} clicks!", count++);

}; Method 3: use the interface Make your class that implements the Activity interface public class MainActivity : Activity,View.IOnClickListener public class MainActivity : Activity,View.IOnClickListener { .... public void OnClick(View v) { button.Text = string.Format ("{0} clicks!", count++);

   }

} Click event Listener settings in your Activity class OnCreate

button.SetOnClickListener(this);

3. CustomAdapters
4. Optimization FastScrolling

		filterlistView
			//.SetOnItemClickListener(new IOnItemClickListenerAnonymousInnerClassHelper(this));
			.ItemClick += (object sender, AdapterView.ItemClickEventArgs e) => 
			{					}
			};
		}
	}
	
	
	
	private class IOnItemClickListenerAnonymousInnerClassHelper : AdapterView.IOnItemClickListener
	{
		private readonly Sif_Example_ImageFilter outerInstance;

		public IOnItemClickListenerAnonymousInnerClassHelper(Sif_Example_ImageFilter outerInstance)
		{
			this.outerInstance = outerInstance;
		}

		public override void OnItemClick(AdapterView parent, View view, int position, long id)
		{

			if (outerInstance.bmBackgroundBitmap == null)
			{
				Toast.MakeText(outerInstance.mContext, "Input image does not selected!, select Image firtsly", ToastLength.Short).Show();
				return;
			}

			outerInstance.mImageOperationIndex = position;
			outerInstance.mImageOperation = outerInstance.imageOperationByIndex[outerInstance.mImageOperationIndex];

			if (outerInstance.mImageOperation == SifImageFilter.FILTER_ORIGINAL)
			{
				outerInstance.mBackgroudnImageView.SetImageBitmap(outerInstance.bmBackgroundBitmap);
			}
			else
			{
				outerInstance.bmFilteredBitmap = outerInstance.bmBackgroundBitmap.Copy(Bitmap.Config.Argb8888, true);

				if (outerInstance.mImageOperation != SifImageFilter.FILTER_ORIGINAL)
				{
					outerInstance.bmFilteredBitmap = SifImageFilter.FilterImageCopy(outerInstance.bmBackgroundBitmap, outerInstance.mImageOperation, outerInstance.mImageOperationLevel);
					if (outerInstance.bmFilteredBitmap != null)
					{
						outerInstance.mBackgroudnImageView.SetImageBitmap(outerInstance.bmFilteredBitmap);
					}
					else
					{
						Toast.MakeText(outerInstance.mContext, "Fail to apply image filter", ToastLength.Long).Show();
					}
				}

				if (outerInstance.bmFilteredBitmap != null)
				{
					outerInstance.bmFilteredBitmap = outerInstance.bmFilteredBitmap.Copy(Bitmap.Config.Argb8888, false);
					SifImageFilter.SetImageTransparency(outerInstance.bmFilteredBitmap, outerInstance.mTransparency);
					outerInstance.mBackgroudnImageView.SetImageBitmap(outerInstance.bmFilteredBitmap);
				}
				// reset the transparency
				outerInstance.mTransparency = 0;
			}
		}
	}
	*/