RecyclerView #android

recyclerview.java

protected void onCreate(Bundle savedInstanceState) {
	DividerItemDecoration decoration = new DividerItemDecoration(getApplicationContext(), VERTICAL);
	recyclerView.addItemDecoration(decoration);
}

// override onDraw ItemDecoration.java, draw a devider line
@Override
public void onDraw(Canvas canvas, RecyclerView parent, RecyclerView.State state) {
  canvas.save();
  final int leftWithMargin = convertDpToPixel(56);
  final int right = parent.getWidth();

  final int childCount = parent.getChildCount();
  for (int i = 0; i < childCount; i++) {
    final View child = parent.getChildAt(i);
    int adapterPosition = parent.getChildAdapterPosition(child);
    left = (adapterPosition == lastPosition) ?  0 : leftWithMargin;
    parent.getDecoratedBoundsWithMargins(child, mBounds);
    final int bottom = mBounds.bottom + Math.round(ViewCompat.getTranslationY(child));
    final int top = bottom - mDivider.getIntrinsicHeight();
    mDivider.setBounds(left, top, right, bottom);
    mDivider.draw(canvas);
  }
  canvas.restore();
}

tips.md

• AsyncListUtil https://android.jlelse.eu/how-to-use-asynclistutil-16b5175bb468
• PagedListAdapter - to handle paging