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android – Animate list items in ListView

Posted by: admin June 15, 2020 Leave a comment

Questions:

I try to animate new items in my ListView. I have stable id-s, so I know exactly which element to animate. The problem comes from the recycle mechanism of ListView. I call startAnimation on the View when I know I got a recently inserted element. But then, the view got recycled, filled with different data.
It results on the UI animating the wrong row. At some point the view was holding the right data, but then got recycled. I confirmed this via logcat.
Is there any way to solve this?

EDIT:

public ExpensCursorAdapter(Context context, Cursor c, boolean autoRequery,
        CopyOnWriteArraySet<String> fadeAnimateTags) {
    super(context, c, autoRequery);
    this.mFadeAnimTags = fadeAnimateTags;
}

@Override
public boolean hasStableIds() {
    return true;
}

@Override
public void bindView(View view, Context context, Cursor cursor) {
    setup(view, context, cursor);
}

private void setup(View view, Context context, Cursor cursor) {
    final String id = cursor.getString(4);
    if (LOCAL_LOGV) Log.v(TAG, String.format("Create item for %s. Received view: %s", id, view.toString()));
    view.setTag(id);
    final TextView dateText = (TextView) view.findViewById(R.id.date);
    final TextView timeText = (TextView) view.findViewById(R.id.time);
    final TextView title = (TextView) view.findViewById(R.id.title);
    final TextView amount = (TextView) view.findViewById(R.id.amount);
    final Date date = new Date(cursor.getLong(0));
    title.setText(cursor.getString(1));
    dateText.setText(dFormat.format(date));
    timeText.setText(tFormat.format(date));
    amount.setText(String.format("%d Ft", cursor.getInt(2)));
    if (cursor.getInt(3) == 1) {
        timeText.setTextColor(Color.LTGRAY);
        title.setTextColor(Color.LTGRAY);
        dateText.setTextColor(Color.LTGRAY);
        amount.setTextColor(Color.LTGRAY);
    } else {
        timeText.setTextColor(Color.BLACK);
        title.setTextColor(Color.BLACK);
        dateText.setTextColor(Color.BLACK);
        amount.setTextColor(Color.BLACK);
    }
    if (mFadeAnimTags.contains(id)) {
     view.setAnimation(AnimationUtils.loadAnimation(context, R.anim.fade));
     mFadeAnimTags.remove(id);
    }

}

@Override
public View newView(Context context, Cursor cursor, ViewGroup parent) {
    final LayoutInflater inflater = LayoutInflater.from(context);
    View view = inflater.inflate(R.layout.expense_list_item, parent, false);
    setup(view, context, cursor);
    return view;
}
How to&Answers:

If you use getView() simple code here,
(No need custom library)

private int lastPosition = -1;

@Override
public View getView(int position, View convertView, ViewGroup parent) {
//Load your view, populate it, etc...
View view = ...;

Animation animation = AnimationUtils.loadAnimation(getContext(), (position > lastPosition) ? R.anim.up_from_bottom : R.anim.down_from_top);
view.startAnimation(animation);
lastPosition = position;

return view;
}

up_from_bottom.xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
 android:shareInterpolator="@android:anim/decelerate_interpolator">
<translate
    android:fromXDelta="0%" android:toXDelta="0%"
    android:fromYDelta="100%" android:toYDelta="0%"
    android:duration="400" />
</set>

down_from_bottom.xml

 <?xml version="1.0" encoding="utf-8"?>
 <set xmlns:android="http://schemas.android.com/apk/res/android"
 android:shareInterpolator="@android:anim/decelerate_interpolator">
<translate
    android:fromXDelta="0%" android:toXDelta="0%"
    android:fromYDelta="-100%" android:toYDelta="0%"
    android:duration="400" />
 </set>

Reference from this site:http://kylewbanks.com/blog/Implementing-Google-Plus-Style-ListView-Animations-on-Android

Answer:

Animate each added element in the getView method of your Custom Adapter.

public View getView(int position, View convertView, ViewGroup parent) {

    View v = convertView;

    if (v == null) {
        LayoutInflater vi = (LayoutInflater) getActivity()
            .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        v = vi.inflate(R.layout.simple_list_item_1, null);
    }

    ListData o = list.get(position);
    TextView tt = (TextView) v.findViewById(R.id.toptext);

    tt.setText(o.content);

    Log.d("ListTest", "Position : "+position);

    if(flag == false) {
        Animation animation = AnimationUtils.loadAnimation(getActivity(), R.anim.slide_top_to_bottom);
        v.startAnimation(animation);
    }
    return v;
}

And thereby achieve the animation.

Answer:

Have a look at the ListViewAnimations library to animate your ListView items.

Basically, you would only have to add two more lines to have your items animated:

Before:

MyListAdapter mAdapter = new MyListAdapter(this, getItems());
getListView().setAdapter(mAdapter);

After:

MyListAdapter mAdapter = new MyListAdapter(this, getItems());
AlphaInAnimationAdapter alphaInAnimationAdapter = new AlphaInAnimationAdapter(mAdapter);
alphaInAnimationAdapter.setAbsListView(getListView());
getListView().setAdapter(alphaInAnimationAdapter);

Answer:

I had a similar problem. I’m not 100% sure if this is the right way to go, but you can try clearing the animation on the view before starting a new one to cancel any leftover animation from the recycled view. This helped me.

if(flag == false) {
    v.clearAnimation();
    Animation animation = AnimationUtils.loadAnimation(getActivity(), R.anim.slide_top_to_bottom);
    v.startAnimation(animation);
}