Question

当scrollState不是IDLE时，如何避免滚动RecyclerView？

我尝试了一些想法，例如在canScrollHorizontally()中覆盖LinearLayoutManager，并在false或同一概念应用于scrollState != IDLE dispatchTouchEvent()时返回Activity }，但它会永远停留在屏幕上。

我也尝试了一个Asyntask方法，但是while循环让它永远不会逃脱doInBackground并转到onPostExercute：

 @Override
        public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
            super.onScrollStateChanged(recyclerView, newState);

            if (previousScrollState != 0) {

                new AsyncTask<Void, Void, Boolean>() {

                    @Override
                    protected Boolean doInBackground(Void... params) {

                        while (previousScrollState != 0) {
                            Log.i(TAG, "doInBackground " + previousScrollState);
                        }

                        return true;
                    }

                    @Override
                    protected void onPreExecute() {
                        super.onPreExecute();
                        recList.setTouchEnabled(false);
                    }

                    @Override
                    protected void onPostExecute(Boolean aVoid) {
                        super.onPostExecute(aVoid);
                        recList.setTouchEnabled(true);
                        Log.i(TAG, "onPostExecute " + previousScrollState);
                    }
                }.execute();

            }

            previousScrollState = newState;
}

我的目的是避免用户跳过任何页面（同时滚动两次或更多次）。我怎样才能实现它？谢谢分享。

Answer 1

不确定这是否是一个糟糕的解决方案，但在得到更好的答案之前：

 @Override
        public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
            super.onScrollStateChanged(recyclerView, newState);

            if (previousScrollState != RecyclerView.SCROLL_STATE_IDLE) {

                if (asyncCheckScrollState == null || asyncCheckScrollState.isCancelled()) {

                    asyncCheckScrollState = new AsyncCheckScrollState();
                    asyncCheckScrollState.execute();

                }
            }

        // ...

        previousScrollState = newState;
}

和

public class AsyncCheckScrollState extends AsyncTask<Void, Void, Void> {

    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        recList.setTouchEnabled(false);
    }

    @Override
    protected Void doInBackground(Void... params) {

        try {

            while (previousScrollState != 0) {
                if (isCancelled()) {
                    Log.i(TAG, "canceled ");
                    break;
                }
            }

        } catch (Exception e) {
        } finally {
            this.cancel(true);
        }

        return null;
    }

    @Override
    protected void onCancelled() {
        super.onCancelled();
        recList.setTouchEnabled(true);
    }
}

Android RecyclerView：当滚动状态不是IDLE时，如何避免滚动中断（滚动两次）？

1 个答案: