Listview Item进入和删除动画

从右边划入的动画

• 定义xml动画

<?xml version="1.0" encoding="utf-8"?>
<translate xmlns:android="http://schemas.android.com/apk/res/android"
    android:duration="@integer/animTime"
    android:fromXDelta="100%p"
    android:toXDelta="0%p" >
</translate>

• Adapter里只需要写如下代码

@Override
public View getChildView(final int groupPosition, int childPosition, 
     boolean isLastChild, View convertView, ViewGroup parent) {
    ....
    if (!junk.isAnimatedBefore()) {
        junk.setAnimatedBefore(true);
        convertView.startAnimation(AnimationUtils.loadAnimation(mContext, R.anim.slide_left_in));
    }else{
        convertView.clearAnimation();
    }
    return convertView;
}

从左边划出的动画

• 定义xml动画

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
    android:fillEnabled="true"
    android:fillAfter="true"
    android:duration="@integer/animTime">
    <translate
        android:fromXDelta="0%p"
        android:toXDelta="-100%p">

    </translate>
</set>

• Adapter里不需要做什么，需要在外面操作ListView.

在外面操作ListView

• 开始动画

private void startBoost() {
    mIsDeleting = true;
    boolean hasAnimation = false;
    long offset = 0;
    mAnimCount = 0;
    int groupPosition = -1;
    int childPosition = -1;
    Iterator<ArrayList<Junk>> listIterator = mChildren.iterator();
    while (listIterator.hasNext()) {
        groupPosition++;
        final Iterator<Junk> junkIterator = listIterator.next().iterator();
        while (junkIterator.hasNext()) {
            childPosition++;
            Junk junk = junkIterator.next();
            if (junk.isChecked()) {
                ...
                junkIterator.remove();
                final View itemView = ListViewUtil.getChildItemView(this,
                                                 mListView, groupPosition, childPosition);
                if (itemView != null) {
                    hasAnimation = true;
                    ((Animation) itemView.getTag(R.id.anim)).setAnimationListener(mAnimationListener);
                    ((Animation) itemView.getTag(R.id.anim)).setStartOffset(offset);
                    offset += 100;
                    itemView.startAnimation(((Animation) itemView.getTag(R.id.anim)));
                }
            }
        }
    }
    if (!hasAnimation) {
        deleteCompleted();
    }
}

• mAnimationListener定义如下：

private Animation.AnimationListener mAnimationListener = new Animation.AnimationListener() {
    @Override
    public void onAnimationStart(Animation animation) {
        mAnimCount++;
    }

    @Override
    public void onAnimationEnd(Animation animation) {
        mAnimCount--;
        if (mAnimCount == 0) {
            deleteCompleted();
        }
    }

    @Override
    public void onAnimationRepeat(Animation animation) {

    }
};

• 删除完成后需要调用ListViewUtil.clearListViewAnim(this, mListView);,否则原来动画的地方会显示空白。
• 动画时要禁用OnTouch事件，因为我们做动画时并没有调用mAdapter.notifyDataSetChanged()，所以如果滚动，由于数据没有同步，肯定会挂掉。

禁用OnTouch事件的方法如下

@Override
public boolean dispatchTouchEvent(MotionEvent ev) {
    // intercept touch event when deleting ,avoid listview get view.
    if (mIsDeleting) {
        return true;
    }

    return super.dispatchTouchEvent(ev);
}

ListView的工具方法

public static View getChildItemView(Context context, FloatingGroupExpandableListView listView, int groupPosition, int childPosition) {
    long packedPosition = ExpandableListView.getPackedPositionForChild(groupPosition, childPosition);
    int flatPosition;
    try {
        flatPosition = listView.getFlatListPosition(packedPosition);
    } catch (Exception e) {
        e.printStackTrace();
        return null;
    }
    int firstPosition = listView.getFirstVisiblePosition();
    int wantedChild = flatPosition - firstPosition;
    if (wantedChild < 0 || wantedChild >= listView.getChildCount()) {
        return null;
    }
    View childItemView = listView.getChildAt(wantedChild);
    childItemView.setTag(R.id.anim, AnimationUtils.loadAnimation(context, R.anim.slide_left_out));
    return childItemView;
}

public static View getItemView(Context context, ListView listView, int position) {
    int firstPosition = listView.getFirstVisiblePosition() - listView.getHeaderViewsCount();
    int wantedChild = position - firstPosition;
    if (wantedChild < 0 || wantedChild >= listView.getChildCount()) {
        return null;
    }
    View wantedView = listView.getChildAt(wantedChild);
    wantedView.setTag(R.id.anim, AnimationUtils.loadAnimation(context, R.anim.slide_left_out));
    return wantedView;
}

public static void clearListViewAnim(Context context, ListView listView) {
    int first = listView.getFirstVisiblePosition();
    int count = listView.getChildCount() + 2;
    for (int i = first; i < first + count; i++) {
        View itemView = getItemView(context, listView, i);
        if (itemView != null) {
            itemView.clearAnimation();
        }
    }
}

The link of this page is https://blog.nooa.tech/articles/fb92c8a1/ . Welcome to reproduce it!