sungerk/android-parallax-recyclerview

An adapter which could be used to achieve a parallax effect on RecyclerView.

android-parallax-recycleview

Integration

Step 1. Add the JitPack repository to your build file

repositories {
    maven {
        url "https://jitpack.io"
    }
}

Step 2. Add the dependency

dependencies {
	compile 'com.github.kanytu:android-parallax-recyclerview:v1.4'
}

USAGE

(Example project - https://github.com/kanytu/example-parallaxrecycler)

• Create your object list and pass it to the constructor of ParallaxRecyclerAdapter

List<String> myContent = new ArrayList<String>(); // or another object list
ParallaxRecyclerAdapter<String> adapter = new ParallaxRecyclerAdapter<String>(content) {
            @Override
            public void onBindViewHolderImpl(RecyclerView.ViewHolder viewHolder, ParallaxRecyclerAdapter<String> adapter, int i) {
              // If you're using your custom handler (as you should of course) 
              // you need to cast viewHolder to it.
              ((MyCustomViewHolder) viewHolder).textView.setText(myContent.get(i)); // your bind holder routine.
            }

            @Override
            public RecyclerView.ViewHolder onCreateViewHolderImpl(ViewGroup viewGroup, final ParallaxRecyclerAdapter<String> adapter, int i) {
              // Here is where you inflate your row and pass it to the constructor of your ViewHolder
              return new MyCustomViewHolder(LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.myRow, viewGroup, false));
            }

            @Override
            public int getItemCountImpl(ParallaxRecyclerAdapter<String> adapter) {
              // return the content of your array
              return myContent.size();
            }
        };

• Now we set the parallax header. You need to pass the RecyclerView too to implement the scroll listeners.

myAdapter.setParallaxHeader(LayoutInflater.from(this).inflate(
    R.layout.myParallaxView, myRecycler, false), myRecyclerView);

There a few other listeners you can implement:

// Event triggered when you click on a item of the adapter.
void onClick(View v, int position); 

// Event triggered when the parallax is being scrolled.
void onParallaxScroll(float percentage, float offset, View parallax); 

RESULT

COOL EFFECTS YOU CAN DO WITH THIS LIBRARY

• Transparent toolbar effect

@Override
public void onParallaxScroll(float percentage, float offset, View parallax) {
  Drawable c = mToolbar.getBackground();
  c.setAlpha(Math.round(percentage * 255));
  mToolbar.setBackground(c);
}

License

Copyright (c) 2014 Pedro Oliveira

Licensed under the Apache License, Version 2.0