SnapHelper项目位置

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RecyclerView

SnapHelper

mRecyclerView.setHasFixedSize(true);    // use a linear layout manager    mLayoutManager = new LinearLayoutManager(this, LinearLayoutManager.HORIZONTAL, false);    mRecyclerView.setLayoutManager(mLayoutManager);    // specify an adapter (see also next example)    mAdapter = new DemoSlidesAdapter(getApplicationContext());    mRecyclerView.setAdapter(mAdapter);    final SnapHelper snapHelper = new LinearSnapHelper();    snapHelper.attachToRecyclerView(mRecyclerView);    mRecyclerView.addonScrollListener(new RecyclerView.onScrollListener() {        @Override        public void onScrollStateChanged(RecyclerView recyclerView, int newState) { super.onScrollStateChanged(recyclerView, newState); if(newState == RecyclerView.SCROLL_STATE_IDLE) {     View centerView = snapHelper.findSnapView(mLayoutManager);     int pos = mLayoutManager.getPosition(centerView);     Log.e("Snapped Item Position:",""+pos); }        }    });