package com.rahul.bounce; import android.animation.ArgbEvaluator; import android.app.Fragment; import android.os.Bundle; import android.support.v7.widget.LinearLayoutManager; import android.support.v7.widget.RecyclerView; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.ImageView; import com.rahul.bounce.library.BounceTouchListener; public class RecyclerViewFragment extends Fragment { int headerHeight; int scrollY; private RecyclerView recyclerView; private View header; private View headerOverlay; private BounceTouchListener bounceTouchListener; private View main; private ImageView sun; private int maxSunTranslation; private ArgbEvaluator argbEvaluator = new ArgbEvaluator(); private int dayColor = 0Xff23c7c9; private int nightColor = 0Xff0b1329; private RecyclerView.OnScrollListener onScrollListener = new RecyclerView.OnScrollListener() { @Override public void onScrolled(RecyclerView recyclerView, int dx, int dy) { super.onScrolled(recyclerView, dx, dy); scrollY += dy; int headerTranslation = (int) (-scrollY * .5f); header.setTranslationY(headerTranslation); headerOverlay.setTranslationY(headerTranslation); headerOverlay.setAlpha(Math.min(1, ((float) scrollY) / headerHeight)); } }; public RecyclerViewFragment() { } public static RecyclerViewFragment newInstance() { RecyclerViewFragment fragment = new RecyclerViewFragment(); Bundle args = new Bundle(); fragment.setArguments(args); return fragment; } @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View root = inflater.inflate(R.layout.fragment_recycler_view, container, false); maxSunTranslation = -(int) (getResources().getDimension(R.dimen.header_height) * .25f); main = root.findViewById(R.id.main); sun = (ImageView) root.findViewById(R.id.sun_image_view); header = root.findViewById(R.id.header_image_view); headerOverlay = root.findViewById(R.id.header_overlay); header.setPivotX(Utils.getScreenWidth(getActivity()) * .5f); header.setPivotY(getResources().getDimension(R.dimen.header_height)); headerOverlay.setPivotX(header.getPivotX()); headerOverlay.setPivotY(header.getPivotY()); headerOverlay.setAlpha(0); headerHeight = (int) getResources().getDimension(R.dimen.header_height); recyclerView = (RecyclerView) root.findViewById(R.id.recycler_view); recyclerView.setAdapter(new DemoAdapter()); recyclerView.setLayoutManager(new LinearLayoutManager(getActivity())); recyclerView.setPivotX(Utils.getScreenWidth(getActivity())); recyclerView.addOnScrollListener(onScrollListener); bounceTouchListener = BounceTouchListener.create(recyclerView, new BounceTouchListener.OnTranslateListener() { @Override public void onTranslate(float translation) { if (translation > 0) { sun.setTranslationY(Math.max(maxSunTranslation, -translation)); sun.setAlpha(Math.min(1, translation / getResources().getDimension(R.dimen.options_pad))); bounceTouchListener.setMaxAbsTranslation(-99); header.setRotationX(Math.min((float) Math.pow(translation, .55), 90)); header.setTranslationY(translation); headerOverlay.setRotationX(header.getRotationX()); headerOverlay.setTranslationY(header.getTranslationY()); headerOverlay.setAlpha(Math.min(.4f, translation / -(float) maxSunTranslation)); main.setBackgroundColor((int) argbEvaluator.evaluate(Math.min(1, translation / -(float) maxSunTranslation), dayColor, nightColor)); } else { main.setBackgroundColor(getResources().getColor(R.color.grey)); } } }); recyclerView.setOnTouchListener(bounceTouchListener); return root; } private class DemoAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> { private static final int VIEW_TYPE_PAD = 0; private static final int VIEW_TYPE_NORMAL = 1; private Integer[] data = new Integer[14]; @Override public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int type) { switch (type) { case VIEW_TYPE_NORMAL: { View v = LayoutInflater.from(parent.getContext()) .inflate(R.layout.item_sroll_view, parent, false); NormalViewHolder vh = new NormalViewHolder(v); return vh; } case VIEW_TYPE_PAD: { View v = LayoutInflater.from(parent.getContext()) .inflate(R.layout.item_pad, parent, false); PadViewHolder vh = new PadViewHolder(v); return vh; } } return null; } @Override public void onBindViewHolder(RecyclerView.ViewHolder viewHolder, int position) { } @Override public int getItemCount() { return data.length; } @Override public int getItemViewType(int position) { return position == 0 ? VIEW_TYPE_PAD : VIEW_TYPE_NORMAL; } private class NormalViewHolder extends RecyclerView.ViewHolder { public NormalViewHolder(View itemView) { super(itemView); } } private class PadViewHolder extends RecyclerView.ViewHolder { public PadViewHolder(View itemView) { super(itemView); } } } }