Vfrdtyky

I have a listview with some elements, I have to make this list scroll automatically, with a slow scroll.

When he reaches the last element he stops.

If new items are added in the queue, then the listview must restart, until it reaches the last element again.

Any suggestions?

I suggest, thought your adapter implemented in effective way. so this code is just scrolls listview

you need to try another values of variables

final long totalScrollTime = Long.MAX_VALUE; //total scroll time. I think that 300 000 000 years is close enouth to infinity. if not enought you can restart timer in onFinish()



final int scrollPeriod = 20; // every 20 ms scoll will happened. smaller values for smoother



final int heightToScroll = 20; // will be scrolled to 20 px every time. smaller values for smoother scrolling



listView.post(new Runnable() {

                        @Override

                        public void run() {

                                new CountDownTimer(totalScrollTime, scrollPeriod ) {

                                    public void onTick(long millisUntilFinished) {

                                        listView.scrollBy(0, heightToScroll);

                                    }



                                public void onFinish() {

                                    //you can add code for restarting timer here

                                }

                            }.start();

                        }

                    });

use the below method to scroll your listview. for example:

scrollMyTableView(activityListview,11,0,getTotalHeightofListView(activityListview),0);

method:

private void scrollMyTableView(View v,final int var, int fromY, int toY, int delay){



    ObjectAnimator objectAnimator = ObjectAnimator.ofInt(v, "scrollY", fromY, toY).setDuration(2000);

    objectAnimator.setStartDelay(delay);

    objectAnimator.start();

    objectAnimator.addListener(new Animator.AnimatorListener() {

        @Override

        public void onAnimationStart(Animator animation) {}



        @Override

        public void onAnimationEnd(Animator animation) {



        }



        @Override

        public void onAnimationCancel(Animator animation) {}



        @Override

        public void onAnimationRepeat(Animator animation) {}

    });

}

and if new item added to adapter and need to again go to top of listview and again come back to bottom.you can use below code to do this:

myAdapter.registerDataSetObserver(new DataSetObserver() {

            @Override

            public void onChanged() {

                super.onChanged();

                activityListview.setSelection(0);

scrollMyTableView(activityListview,11,0,getTotalHeightofListView(activityListview),0);

            }

        });

To calculate the height of listview use below method

public int getTotalHeightofListView(ListView listView) {



        ListAdapter mAdapter = listView.getAdapter();



        int totalHeight = 0;



        for (int i = 0; i < mAdapter.getCount(); i++) {

            View mView = mAdapter.getView(i, null, listView);



            mView.measure(

                    View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED),



                    View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED));



            totalHeight += mView.getMeasuredHeight();



        }

        return totalHeight;



    }

Use listview smoothScrollToPosition(int position) function.

Please have a look on this post also
https://www.codota.com/code/java/methods/android.widget.ListView/smoothScrollToPosition