How to apply android layout animation only to children above a certain index?

I have a ListView containing a series of notes.

Currently I use a layout animation to slide all the notes in from the side when the list first loads; this works perfectly.

However, I'm trying to figure out how to apply a layout animation only to list items below a certain point. Say I delete an item on the list: I'd like all items below it to shift up into the deleted note's old spot.

I've tried finding a way to customize the animation delays or interpolators by child index but haven't found anything appropriate for this location. Is there a way to do this using a custom layout animation (such as extending LayoutAnimationController) or would I have开发者_如何学运维 to do this low level and animate each view individually?

Any suggestions?

Create your animation and call it in your list OnItemClickListener. After that you might use the adapter's notifyDataSetChanged to refresh the list content.

In this example, I created a method called removeListItem with receives the row you want to remove and the position of that row in you list content array.

public class MainActivity extends ListActivity implements OnItemClickListener{

ArrayList<String> values;
ArrayAdapter<String> adapter;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    values = generateMockData(50);

    adapter = new ArrayAdapter<String>(
            this, android.R.layout.simple_list_item_1, values);

    setContentView(R.layout.activity_main);

    getListView().setAdapter(adapter);
    getListView().setOnItemClickListener(this);
}

private ArrayList<String> generateMockData(int number) {

    ArrayList<String> result = new ArrayList<String>();

    for(int i = 0; i < number; i++)
        result.add(""+i+" "+ (int)Math.random() * 13);

    return result;
}

private void removeListItem(View rowView, final int positon) {

    Animation anim = AnimationUtils.loadAnimation(this,
            android.R.anim.slide_out_right);
    anim.setDuration(500);
    rowView.startAnimation(anim);

    new Handler().postDelayed(new Runnable() {

        public void run() {

            values.remove(positon);//remove the current content from the array

            adapter.notifyDataSetChanged();//refresh you list

        }

    }, anim.getDuration());

}

public void onItemClick(AdapterView<?> arg0, View row, int position, long arg3) {

       if(position == YOUR_INDEX) //apply your conditions here!
          removeListItem(row,position);
}

I had a very similar problem and was able to find a solution with a simple View subclass that allows you to use a layout animation controller to animate only the views that you specify. Please see this link:

Can LayoutAnimationController animate only specified Views

In your layout xml, try adding:

<ListView  
  android:id="@android:id/list"
  ... 
  android:animateLayoutChanges="true"/>  

This will automatically animate insertions and deletions from your listview.
If you have a custom animation, named anim_translate_left, use instead:

<ListView  
  android:id="@android:id/list"
  ... 
  android:animateLayoutChanges="@anim/anim_translate_left"/>   

Source: Google API's