如何添加recyclerview项目删除动画

时间:2018-11-08 13:23:00

标签: android android-recyclerview removeall

当我使用它时,它会删除带有动画的一个元素

{
    notificationItems.remove(0);
    adapterForNotification.notifyItemRemoved(0);                        
    adapterForNotification.notifyItemRangeRemoved(0,count-1);
}

当我使用它时,它会删除所有没有动画的元素

count = adapter.getItemCount();
for(int i = 0 ; i < count; ++i){
    notificationItems.remove(0);
    adapterForNotification.notifyItemRemoved(0);
    adapterForNotification.notifyItemRangeRemoved(0,count-1)
}

4 个答案:

答案 0 :(得分:0)

您不应该同时使用notifyItemRemoved()notifyItemRangeRemoved()。一次只能使用一个。

如果要删除一项:

notificationItems.remove(index);
adapterForNotification.notifyItemRemoved(index);

如果要删除所有项目:

int origCount = notificationItems.size();
notificationItems.clear();
adapterForNotification.notifyItemRangeRemoved(0, origCount - 1);

如果要删除一系列项目:

notificationItems.subList(startIndex, endIndex).clear();
adapterForNotification.notifyItemRangeRemoved(startIndex, endIndex);

编辑:

如果您要一个一个地删除每个项目并显示每个项目的删除动画,请尝试以下操作:

for (int i = 0; i < notificationItems.size(); i++) {
    notificationItems.remove(i);
    adapterForNotification.notifyItemRemoved(i);
}

答案 1 :(得分:0)

count = adapter.getItemCount();

for (int i = 0 ; i < count; ++i){
    notificationItems.remove(0);
}
adapterForNotification.notifyItemRangeRemoved(0, count-1)

答案 2 :(得分:0)

据我了解,您可以删除项目,但删除时需要添加某种动画;请看看design guidelines

,如果有人在这里停留,则会再次在此处发布

它已经很旧了,但希望它对其他人有所帮助,因为它尚未得到答复;我通过模拟一个项目的一次滑动动画来一次删除一个项目,并在删除下一个项目之前发布了一个延迟,依此类推直到RecyclerView <的最后一个项目。 / p>

第1步:

在拥有“清除所有”按钮和RecyclerView实例的活动中:创建一种删除单个项目的方法

private void deleteItem(View rowView, final int position) {

    Animation anim = AnimationUtils.loadAnimation(requireContext(),
            android.R.anim.slide_out_right);
    anim.setDuration(300);
    rowView.startAnimation(anim);

    new Handler().postDelayed(new Runnable() {
        public void run() {
            if (myDataSource.size() == 0) {
                addEmptyView(); // adding empty view instead of the RecyclerView
                return;
            }
            myDataSource.remove(position); //Remove the current content from the array
            myRVAdapter.notifyDataSetChanged(); //Refresh list
        }

    }, anim.getDuration());
}

第二步:

创建一种方法,该方法将删除所有RecyclerView列表项>>在按钮单击回调中调用它。

boolean mStopHandler = false;

private void deleteAllItems() {

    final Handler handler = new Handler();
    Runnable runnable = new Runnable() {
        @Override
        public void run() {

            if (myDataSource.size() == 0) {
                mStopHandler = true;
            }

            if (!mStopHandler) {
                View v = myRecyclerView.findViewHolderForAdapterPosition(0).itemView;
                deleteItem(v, 0);
            } else {
                handler.removeCallbacksAndMessages(null);
            }

            handler.postDelayed(this, 250);
        }
    };
    requireActivity().runOnUiThread(runnable);
}

同样重要的是,在清单,活动部分中处理配置更改,就好像在清除回收者视图列表时配置更改一样,也会引发异常

<activity
    android:name=".activities.MainActivity"
    android:configChanges="orientation|screenSize|keyboard"
    android:label="@string/app_name"
    ...
</activity>

答案 3 :(得分:0)

为此,我直接从recyclerview的适配器访问列表项的视图,对其进行动画处理,并在播放最后一个动画后通知适配器。

fun deleteMultipleAnimated(){
    val oldSize = myList.size
    
    myList.removeAt(3)
    myList.removeAt(4)

    val newSize = myList.size

    for(i in newSize until oldSize){

        val listItemView = myRecycler.findViewHolderForAdapterPosition(i) as MyAdapater.MyViewHolder            

        if(i == oldSize-1){ 

            //only the last animation notifies the adapter
            listItemView.myView.animate().scaleX(0f).setDuration(250).withEndAction{
                myAdapter.notifyItemRangeRemoved(newSize, oldSize)}
        }else{

            //every other view is animated without an end action
            listItemView.myView.animate().scaleX(0f).duration = 250
        }
    }
}