gistfile1.java

public class RecyclerViewEmptySupport extends RecyclerView {

    @Inject ViewFadeAnimator viewFadeAnimator;

    private int marginTop;
    private View progressView;
    private View emptyView;

    public RecyclerViewEmptySupport(Context context) {
        this(context, null);
    }

    public RecyclerViewEmptySupport(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public RecyclerViewEmptySupport(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        inject();
    }

    private void inject() {
        PathfinderApp app = (PathfinderApp) getContext().getApplicationContext();
        ObjectGraph appGraph = Injector.obtain(app);
        appGraph.inject(this);
    }

    private TransactionListener transactionListener = new TransactionListener() {
        @Override
        public void startTransaction() {
        }

        @Override
        public void finishTransaction(boolean didChangesOccur) {
            if (!didChangesOccur) {
                return;
            }

            setViewVisibility();
        }
    };

    private void setViewVisibility() {
        Adapter<?> adapter =  getAdapter();
        if(adapter != null && progressView != null) {
            if(adapter.getItemCount() == 0 && getVisibility() == VISIBLE) {
                viewFadeAnimator.fadeOutView(progressView);
                viewFadeAnimator.fadeOutView(RecyclerViewEmptySupport.this);
                viewFadeAnimator.fadeInView(emptyView);
            }
            else if (getVisibility() != VISIBLE) {
                viewFadeAnimator.fadeOutView(progressView);
                viewFadeAnimator.fadeOutView(emptyView);
                viewFadeAnimator.fadeInView(RecyclerViewEmptySupport.this);
            }
        }
    }

    public void displayProgressView() {
        progressView.setVisibility(View.VISIBLE);
        emptyView.setVisibility(View.GONE);
        RecyclerViewEmptySupport.this.setVisibility(View.GONE);
    }

    public void setAdapter(BaseAdapter adapter) {
        super.setAdapter(adapter);

        if(adapter != null) {
            adapter.registerTransactionListener(transactionListener);
        }
    }

    public void setProgressView(View progressView) {
        this.progressView = progressView;
    }

    public void setEmptyView(View emptyView) {
        this.emptyView = emptyView;
    }

    public void setBaseTopMargin(int margin) {
        this.marginTop = margin;
    }

    public void setEmptyContentOffset(int offset) {
        setMarginOffset(offset, progressView);
        setMarginOffset(offset, emptyView);
    }

    private void setMarginOffset(int offset, View view) {
        if (view == null) {
            return;
        }

        CoordinatorLayout.LayoutParams params = (CoordinatorLayout.LayoutParams) view.getLayoutParams();
        if (params.topMargin == marginTop + offset) {
            return;
        }

        params.setMargins(0, marginTop + offset, 0, 0);
        view.setLayoutParams(params);
    }
}