I'm sure you've met the effect of galleries in projects. There are many ways on the Internet, such as viewPager, recyclerview and so on. Today, we recommend a three-party Gallery layoutmanager, which is easy to realize quickly and solve the urgent problem.

rely on

gradle dependence

compile 'github.hellocsl:GalleryLayoutManager:1.0.6'

Realization

Layout file

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <android.support.v7.widget.RecyclerView
        android:id="@+id/recycler"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

</RelativeLayout>

adapter set by recyclerView

private class Adapter extends RecyclerView.Adapter<RecyclerHolder> {

    private Context context;

    private Adapter(Context context) {
        this.context = context;
    }

    @Override
    public RecyclerHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(context).inflate(R.layout.item_view, null);
        //Customize the width of the view and control the number of displays on one screen
        LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT);
        int width = context.getResources().getDisplayMetrics().widthPixels;
        params.width = width / 3;
        view.setLayoutParams(params);
        return new RecyclerHolder(view);
    }

    @Override
    public void onBindViewHolder(RecyclerHolder holder, int position) {

    }

    @Override
    public int getItemCount() {
        return 10;
    }
}

private class RecyclerHolder extends RecyclerView.ViewHolder {
    private View view;

    public RecyclerHolder(View itemView) {
        super(itemView);
        view = itemView;
    }

    public View getView() {
        return view;
    }
}

Each item simply places a layout

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:gravity="center"
    android:orientation="vertical">

    <ImageView
        android:layout_width="100dp"
        android:layout_height="wrap_content"
        android:src="@mipmap/dota" />

</LinearLayout>

The third-party GalleryLayoutManager is used to bind with recyclerView and set as horizontal sliding layout

GalleryLayoutManager manager = new GalleryLayoutManager(GalleryLayoutManager.HORIZONTAL);
manager.attach(recycler);
//Set sliding zoom effect
manager.setItemTransformer(new Transformer());
recycler.setAdapter(new Adapter(this));

Zoom effect processing

//Scaling during sliding
public class Transformer implements GalleryLayoutManager.ItemTransformer {
    @Override
    public void transformItem(GalleryLayoutManager layoutManager, View item, float fraction) {
        //Scale with center
        item.setPivotX(item.getWidth() / 2.0f);
        item.setPivotY(item.getHeight() / 2.0f);
        float scale = 1 - 0.3f * Math.abs(fraction);
        item.setScaleX(scale);
        item.setScaleY(scale);
    }
}

You can customize the width of each view in RecyclerView, control the display effect of one screen, and operate in onCreateViewHolder of adapter

@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    View view = LayoutInflater.from(context).inflate(R.layout.item_view, null);
    //Customize the width of the view and control the number of displays on one screen
    LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT);
    int width = context.getResources().getDisplayMetrics().widthPixels;
    params.width = width / 3;
    view.setLayoutParams(params);
    return new RecyclerHolder(view);
}

Sliding Monitoring

Slide to monitor the final stop position

manager.setOnItemSelectedListener(new GalleryLayoutManager.OnItemSelectedListener() {
    @Override
    public void onItemSelected(RecyclerView recyclerView, View item, int position) {
        //Slide to position of an item
    }
});

At the same time, it supports clicking on each item to switch, and in the onBindViewHolder method of adapter

@Override
public void onBindViewHolder(RecyclerHolder holder, final int position) {
    holder.getView().setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            recycler.smoothScrollToPosition(position);
        }
    });
}

So far, a simple gallery effect implementation, if your project just needs this, and I have it.
Of course, this is just a brief introduction to the realization of gallery effect. This library also provides the effect of sliding up and down