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The Material Components Library introduced with the 1.2.0-alpha03 the new ShapeableImageView.

In your layout you can use:

 <com.google.android.material.imageview.ShapeableImageView
      android:id="@+id/image_view"
      app:srcCompat="@drawable/..." />

Then in your code apply the ShapeAppearanceModel to define your custom corners:

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public class PagerActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_paper);
        ViewPager pager = (ViewPager) findViewById(R.id.pager);
        pager.setAdapter(new PageAdapter(getSupportFragmentManager()));
    }

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<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >

    <!-- Drop Shadow Stack -->
    <item>
        <shape>
            <padding
                android:bottom="1dp"
                android:left="1dp"
                android:right="1dp"

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<?xml version="1.0" encoding="utf-8"?>
<!--
  Copyright 2016 Google Inc.

  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

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StringRequest request = new StringRequest(Request.Method.POST, url, new Response.Listener<String>() {
    @Override
    public void onResponse(String s) {
        ///handle response from service
    }, new ErrorResponse() {
      @Override
      public void onErrorResponse(VolleyError volleyError) {
        //handle error response
      }
  }) {

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import android.annotation.TargetApi;
import android.content.Context;
import android.graphics.Matrix;
import android.graphics.drawable.Drawable;
import android.os.Build;
import android.util.AttributeSet;
import android.widget.ImageView;

/**
 * Created by chris on 7/27/16.

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import android.content.Context;
import android.graphics.Matrix;
import android.widget.ImageView;

/**
 * ImageView to display top-crop scale of an image view.
 *
 * @author Chris Arriola
 */
public class TopCropImageView extends ImageView {

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You can use this class to realize a simple sectioned grid RecyclerView.Adapter without changing your code.

The RecyclerView has to use a GridLayoutManager.

This is a porting of the class SimpleSectionedListAdapter provided by Google

If you are looking for a sectioned list RecyclerView.Adapter you can take a look here

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You can use this class to realize a simple sectioned RecyclerView.Adapter without changing your code.

The RecyclerView should use a LinearLayoutManager. You can use this code also with the TwoWayView with the ListLayoutManager (https://github.com/lucasr/twoway-view)

This is a porting of the class SimpleSectionedListAdapter provided by Google

Example:

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public static void postNewComment(Context context,final UserAccount userAccount,final String comment,final int blogId,final int postId){
    mPostCommentResponse.requestStarted();
    RequestQueue queue = Volley.newRequestQueue(context);
    StringRequest sr = new StringRequest(Request.Method.POST,"http://api.someservice.com/post/comment", new Response.Listener<String>() {
        @Override
        public void onResponse(String response) {
            mPostCommentResponse.requestCompleted();
        }
    }, new Response.ErrorListener() {
        @Override