Setting the contents of an INSET in a RecyclerView

Question

I am trying to implement RecyclerView as a UICollectionView in iOS. I want to set the contentInset at the bottom of the recycler window, but I cannot find a variant of it.

Is there something similar for Android?

Answer 1

The solution is simple:

  <android.support.v7.widget.RecyclerView android:paddingBottom="30dp" android:clipToPadding="false" android:layout_width="match_parent" android:layout_height="match_parent" /> 

Answer 2

I created a batch adapter for this, which perfectly isolates the code. But I would like to get a better solution.

 public class HeaderSpaceWrapperAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> { private static final int TYPE_HEADER = 0x4711; private int mSpace; RecyclerView.Adapter mAdapter; public HeaderSpaceWrapperAdapter(RecyclerView.Adapter adapter, int space) { mAdapter = adapter; mSpace = space; mAdapter.registerAdapterDataObserver(new RecyclerView.AdapterDataObserver() { @Override public void onChanged() { notifyDataSetChanged(); } }); } @Override public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { if (viewType == TYPE_HEADER) { return new ViewHolder(new Spacer(parent.getContext(), mSpace)); } return mAdapter.onCreateViewHolder(parent, viewType); } @Override public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) { if (position > 0) { mAdapter.onBindViewHolder(holder, position - 1); } } @Override public int getItemCount() { return 1 + mAdapter.getItemCount(); } @Override public int getItemViewType(int position) { return position == 0 ? TYPE_HEADER : mAdapter.getItemViewType(position - 1); } private class ViewHolder extends RecyclerView.ViewHolder { public ViewHolder(View view) { super(view); } } } 

Then use it:

 mWrapperAdapter = new HeaderSpaceWrapperAdapter(mAdapter, 100); mRecyclerView.setAdapter(mWrapperAdapter); 

Answer 3

You can create your own ItemDecoration and set the offset there for the first item, as well as the fields between the items.

Here is my code for my re-viewing the horizontal scroll.

 public class HorizontalContentItemDecoration extends RecyclerView.ItemDecoration { private int startOffset = 10; private int itemOffset = 10; public HorizontalContentItemDecoration(int startOffset, int itemOffset) { this.startOffset = startOffset; this.itemOffset = itemOffset; } @Override public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) { int position = parent.getChildAdapterPosition(view); if (position == 0) { outRect.set(startOffset, 0, itemOffset, 0); } else { outRect.set(0, 0, itemOffset, 0); } } } 

Answer 4

I decided to add a custom RecyclerView cell that adds an offset at the end of the view with a clear background color.

Answer 5

Although this question is more than a year old, I thought that I would share what I did, someone might like it, or simply do not want to print and can copy / paste: D.

My solution was to add a bottom edge to the last element.

First, I determine that this is the last element:

 @Override public void onBindViewHolder(final ItemViewHolder holder, int position) { .... Your other code .... // Check if it is the last item and the list is not empty. if(position == mItems.size()-1) { // If so, add some margin to the element holder.setBottomMargin(R.dimen.last_item_offset); // some dimension (or set a fixed amount of pixels } } 

Then I have a method in the view node to set the bottom field.

 class ItemViewHolder extends RecyclerView.ViewHolder { private View mRootView; private Context mContext; public ItemViewHolder(View itemView) { super(itemView); mRootView = itemView; mContext = itemView.getContext(); // do more stuff like binding views, etc } public void setBottomMargin(@DimenRes int margin){ RecyclerView.LayoutParams layoutParams = (RecyclerView.LayoutParams) mRootView.getLayoutParams(); layoutParams.bottomMargin = (int)getContext().getResources().getDimension(margin); mRootView.setLayoutParams(layoutParams); } } 

And for the completeness of this example, dimension

 <resources> <dimen name="spot_list_footer_position_offset">-56dp</dimen> </resources> 

Hope this is what you were looking for.

Answer 6

This answer will be an improvement on @Phin's answer.

 @Override public void onBindViewHolder(final ItemViewHolder holder, int position) { .... Your other code .... // Check if it is the last item and the list is not empty. if(i == arraylist.size()-1) { // If so, add some margin to the element itemHolder.setBottomMargin(R.dimen.quick_controls_height); // some dimension (or set a fixed amount of pixels } else { itemHolder.setBottomMargin(R.dimen.zero_margin); //Set zero margin as the views will be reused. } } 

dens.xml:

 <dimen name="quick_controls_height">34.1dp</dimen> <dimen name="zero_margin">0dp</dimen>