android - RecyclerView smoothScrollToPosition 小距离太快

Question

在我们的聊天应用程序中，我们使用 RecyclerView 可以包含不同高度的消息。我想用smoothScroll为消息添加动画。我的问题是:当我使用 recyclerView.smoothScrollToPosition(position)在高度较小的消息上，它滚动得太快。

我也试过这个solution changing smoothScoll speed ，它适用于小消息，但是当消息很大时，它的滚动速度会使消息显得太慢。

我的完美速度是通过 recyclerView.smoothScrollBy(x, y) 实现的，但在这里我在插入消息高度时遇到问题，因为消息可以有任何高度。

Answer 1

覆盖 calculateTimeForScrolling LinearSmoothScroller的方法计算所有距离的时间:

public class SpeedyLinearLayoutManager extends LinearLayoutManager {

private int smoothScrollDuration;

public SpeedyLinearLayoutManager(Context context, int smoothScrollDuration) {
    super(context);
    this.smoothScrollDuration = smoothScrollDuration;
}

public SpeedyLinearLayoutManager(Context context, int orientation, boolean reverseLayout, int smoothScrollDuration) {
    super(context, orientation, reverseLayout);
    this.smoothScrollDuration = smoothScrollDuration;
}

public SpeedyLinearLayoutManager(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes, int smoothScrollDuration) {
    super(context, attrs, defStyleAttr, defStyleRes);
    this.smoothScrollDuration = smoothScrollDuration;
}

@Override
public void smoothScrollToPosition(RecyclerView recyclerView, RecyclerView.State state, int position) {

    final LinearSmoothScroller linearSmoothScroller = new LinearSmoothScroller(recyclerView.getContext()) {

        @Override
        protected int calculateTimeForScrolling(int dx) {
            return smoothScrollDuration;
        }
    };

    linearSmoothScroller.setTargetPosition(position);
    startSmoothScroll(linearSmoothScroller);
}

public int getSmoothScrollDuration() {
    return smoothScrollDuration;
}

public void setSmoothScrollDuration(int smoothScrollDuration) {
    this.smoothScrollDuration = smoothScrollDuration;
}
}

并将其用于recyclerview:

    LinearLayoutManager layoutManager = new SpeedyLinearLayoutManager(context, 100);
    mRecyclerView.setLayoutManager(layoutManager);