Eugene H Eugene H - 1 month ago 34
Android Question

RecyclerView Swipe with a view below it

I have been doing some research and I have yet to find an example or implementation that allows you to put a view (Example Image Below) underneath the RecyclerView when you swipe. Does anyone have any example or an idea of how this would be implemented WITHOUT using a library.

Here is how I am implementing the swipe to dismiss.

ItemTouchHelper.SimpleCallback simpleItemTouchCallback = new ItemTouchHelper.SimpleCallback(0, ItemTouchHelper.LEFT | ItemTouchHelper.RIGHT) {

@Override
public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, RecyclerView.ViewHolder target) {
return false;
}

@Override
public int getSwipeDirs(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) {
return super.getSwipeDirs(recyclerView, viewHolder);
}

@Override
public void onSwiped(RecyclerView.ViewHolder viewHolder, int direction) {
if (viewHolder instanceof ViewDividers) {
Log.e("DIRECTION", direction + "");
}
}
};
new ItemTouchHelper(simpleItemTouchCallback).attachToRecyclerView(recycler);


Here is the example of Google's Inbox:
enter image description here

Answer

My understanding of how this is done is that one would put two views in the xml that would be displayed per line in your recyclerview.

So for example, this would be my adapter:

public class MyAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
    public static class ExampleViewHolder extends RecyclerView.ViewHolder {
        public TextView background;
        public TextView foreground;

        public ExampleViewHolder(View v) {
            super(v);
            background = (TextView) v.findViewById(R.id.background);
            foreground = (TextView) v.findViewById(R.id.foreground);
        }

        @Override
        public void onBindViewHolder(final RecyclerView.ViewHolder holder, final int position) {
            if (holder instanceof ExampleViewHolder) {
                ((ExampleViewHolder) holder).background.setBackgroundColor(); // do your manipulation of background and foreground here.
            }
        }

        @Override
        public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent,
                                                          int viewType) {

            View v = LayoutInflater.from(parent.getContext())
                    .inflate(R.layout.example, parent, false);
            return new ExampleViewHolder(v);
        }


    }
}

Each line in the recyclerview is pulling the xml layout from R.layout.example. Therefore, to create a view underneath, you can just use relativelayout or framelayout to create the views on top of one another:

<RelativeLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/background"
        />

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/foreground"/>
</RelativeLayout>

Then if you do not want to use a library for the swipe, you can copy this class from google and subsequently modified by Bruno Romeu Nunes:

https://github.com/heruoxin/Clip-Stack/blob/master/app/src/main/java/com/catchingnow/tinyclipboardmanager/SwipeableRecyclerViewTouchListener.java

The class will require you to create a swipe listener:

swipeTouchListener =
        new SwipeableRecyclerViewTouchListener(mRecyclerView,
                new SwipeableRecyclerViewTouchListener.SwipeListener() {
                    @Override
                    public boolean canSwipe(int position) {
                        if (position == totalPost.size() - 1 && !connected) {
                            return false;
                        }
                        return true;
                    }

                    @Override
                    public void onDismissedBySwipeLeft(RecyclerView recyclerView, int[] reverseSortedPositions) {
                        for (int position : reverseSortedPositions) {
                            //change some data if you swipe left
                        }
                        myAdapter.notifyDataSetChanged();
                    }

                    @Override
                    public void onDismissedBySwipeRight(RecyclerView recyclerView, int[] reverseSortedPositions) {
                        for (int position : reverseSortedPositions) {
                            //change some data if you swipe right
                        }
                        myAdapter.notifyDataSetChanged();
                    }
                });

Then simply link it with your recyclerview:

    mRecyclerView.addOnItemTouchListener(swipeTouchListener);
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