Android Note: ListView

ListView Property

The Android:divider property allows you to specify the color of the ListView divider, #0000 to set the divider to a transparent color.

Problems with the efficiency of the ListView

Adapter three parameters int position, View Convertview, ViewGroup Parent

1, use the view directly each time to open each load, the lowest efficiency.

Layoutinflater inflater = Layoutinflater.from (Mcontext);

View view1 = inflater.inflate (R.layout.fruit_item, NULL);

2, using Convertview (cache)

if (Convertview = = null) {
View = Layoutinflater.from (GetContext ()). Inflate (resourceId, NULL);
} else {
view = Convertview;
}

3, adding the control's load to the cache

Public View GetView (int position, view Convertview, ViewGroup parent) {
Fruit Fruit = GetItem (position );
View view;
Viewholder Viewholder;
if (Convertview = = null) {
view = Layoutinflater.from (GetContext ()). Inflate (resourceId, null);
Viewholder = new Viewholder ();
Viewholder.fruitimage = (ImageView) View.findviewbyid (r.id.fruit_image);
Viewholder.fruitname = (TextView) View.findviewbyid (r.id.fruit_name);　　　　　　　　　　
View.settag (Viewholder);//Store Viewholder in view
} else {
view = Convertview;
Viewholder = (Viewholder) view.gettag ();　　　　　　　　Retrieve Viewholder
}
ViewHolder.fruitImage.setImageResource (Fruit.getimageid ());
ViewHolder.fruitName.setText (Fruit.getname ());
return view;　　　　　　　　
}
Class Viewholder {
ImageView fruitimage;
TextView Fruitname;
}

ListView Click event

ListView ListView = (ListView) Findviewbyid (R.id.list_view);

Listview.setadapter (adapter);

Listview.setonitemclicklistener (New Onitemclicklistener () {

public void Onitemclick (adapterview<?> parent, view view, int position, long ID) {

Fruit Fruit = fruitlist.get (position);

Toast.maketext (Mainactivity.this, Fruit.getname (), 0). Show ();

}

});

Android Note: ListView