Move all files to natural position.

app/src/main/java/org/thoughtcrime/securesms/giph/model/ChunkedImageUrl.java

@@ -0,0 +1,57 @@
+package org.thoughtcrime.securesms.giph.model;
+
+
+import androidx.annotation.NonNull;
+
+import com.bumptech.glide.load.Key;
+
+import org.thoughtcrime.securesms.util.Conversions;
+
+import java.security.MessageDigest;
+
+public class ChunkedImageUrl implements Key {
+
+  public static final long SIZE_UNKNOWN = -1;
+
+  private final String url;
+  private final long   size;
+
+  public ChunkedImageUrl(@NonNull String url) {
+    this(url, SIZE_UNKNOWN);
+  }
+
+  public ChunkedImageUrl(@NonNull String url, long size) {
+    if (url == null) throw new RuntimeException();
+    this.url = url;
+    this.size   = size;
+  }
+
+  public String getUrl() {
+    return url;
+  }
+
+  public long getSize() {
+    return size;
+  }
+
+  @Override
+  public void updateDiskCacheKey(@NonNull MessageDigest messageDigest) {
+    messageDigest.update(url.getBytes());
+    messageDigest.update(Conversions.longToByteArray(size));
+  }
+
+  @Override
+  public boolean equals(Object other) {
+    if (other == null || !(other instanceof ChunkedImageUrl)) return false;
+
+    ChunkedImageUrl that = (ChunkedImageUrl)other;
+
+    return this.url.equals(that.url) && this.size == that.size;
+  }
+
+  @Override
+  public int hashCode() {
+    return url.hashCode() ^ (int)size;
+  }
+
+}

app/src/main/java/org/thoughtcrime/securesms/giph/model/GiphyImage.java

@@ -0,0 +1,126 @@
+package org.thoughtcrime.securesms.giph.model;
+
+
+import android.text.TextUtils;
+
+import androidx.annotation.Nullable;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+
+import org.thoughtcrime.securesms.util.Util;
+
+public class GiphyImage {
+
+  @JsonProperty
+  private ImageTypes images;
+
+  public String getGifUrl() {
+    ImageData data = getGifData();
+    return data != null ? data.url : null;
+  }
+
+  public long getGifSize() {
+    ImageData data = getGifData();
+    return data != null ? data.size : 0;
+  }
+
+  public String getGifMmsUrl() {
+    ImageData data = getGifMmsData();
+    return data != null ? data.url : null;
+  }
+
+  public long getMmsGifSize() {
+    ImageData data = getGifMmsData();
+    return data != null ? data.size : 0;
+  }
+
+  public float getGifAspectRatio() {
+    return (float)images.downsized.width / (float)images.downsized.height;
+  }
+
+  public int getGifWidth() {
+    ImageData data = getGifData();
+    return data != null ? data.width : 0;
+  }
+
+  public int getGifHeight() {
+    ImageData data = getGifData();
+    return data != null ? data.height : 0;
+  }
+
+  public String getStillUrl() {
+    ImageData data = getStillData();
+    return data != null ? data.url : null;
+  }
+
+  public long getStillSize() {
+    ImageData data = getStillData();
+    return data != null ? data.size : 0;
+  }
+
+  private @Nullable ImageData getGifData() {
+    return getFirstNonEmpty(images.downsized, images.downsized_medium, images.fixed_height, images.fixed_width);
+  }
+
+  private @Nullable ImageData getGifMmsData() {
+    return getFirstNonEmpty(images.fixed_height_downsampled, images.fixed_width_downsampled);
+  }
+
+  private @Nullable ImageData getStillData() {
+    return getFirstNonEmpty(images.downsized_still, images.fixed_height_still, images.fixed_width_still);
+  }
+
+  private static @Nullable ImageData getFirstNonEmpty(ImageData... data) {
+    for (ImageData image : data) {
+      if (!TextUtils.isEmpty(image.url)) {
+        return image;
+      }
+    }
+
+    return null;
+  }
+
+  public static class ImageTypes {
+    @JsonProperty
+    private ImageData fixed_height;
+    @JsonProperty
+    private ImageData fixed_height_still;
+    @JsonProperty
+    private ImageData fixed_height_downsampled;
+    @JsonProperty
+    private ImageData fixed_width;
+    @JsonProperty
+    private ImageData fixed_width_still;
+    @JsonProperty
+    private ImageData fixed_width_downsampled;
+    @JsonProperty
+    private ImageData fixed_width_small;
+    @JsonProperty
+    private ImageData downsized_medium;
+    @JsonProperty
+    private ImageData downsized;
+    @JsonProperty
+    private ImageData downsized_still;
+  }
+
+  public static class ImageData {
+    @JsonProperty
+    private String url;
+
+    @JsonProperty
+    private int width;
+
+    @JsonProperty
+    private int height;
+
+    @JsonProperty
+    private int size;
+
+    @JsonProperty
+    private String mp4;
+
+    @JsonProperty
+    private String webp;
+  }
+
+}

app/src/main/java/org/thoughtcrime/securesms/giph/model/GiphyResponse.java

@@ -0,0 +1,17 @@
+package org.thoughtcrime.securesms.giph.model;
+
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+
+import java.util.List;
+
+public class GiphyResponse {
+
+  @JsonProperty
+  private List<GiphyImage> data;
+
+  public List<GiphyImage> getData() {
+    return data;
+  }
+
+}

app/src/main/java/org/thoughtcrime/securesms/giph/net/GiphyGifLoader.java

@@ -0,0 +1,23 @@
+package org.thoughtcrime.securesms.giph.net;
+
+
+import android.content.Context;
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+
+public class GiphyGifLoader extends GiphyLoader {
+
+  public GiphyGifLoader(@NonNull Context context, @Nullable String searchString) {
+    super(context, searchString);
+  }
+
+  @Override
+  protected String getTrendingUrl() {
+    return "https://api.giphy.com/v1/gifs/trending?api_key=3o6ZsYH6U6Eri53TXy&offset=%d&limit=" + PAGE_SIZE;
+  }
+
+  @Override
+  protected String getSearchUrl() {
+    return "https://api.giphy.com/v1/gifs/search?api_key=3o6ZsYH6U6Eri53TXy&offset=%d&limit=" + PAGE_SIZE + "&q=%s";
+  }
+}

app/src/main/java/org/thoughtcrime/securesms/giph/net/GiphyLoader.java

@@ -0,0 +1,82 @@
+package org.thoughtcrime.securesms.giph.net;
+
+
+import android.content.Context;
+import android.net.Uri;
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import android.text.TextUtils;
+
+import com.annimon.stream.Stream;
+
+import org.thoughtcrime.securesms.logging.Log;
+
+
+import org.thoughtcrime.securesms.giph.model.GiphyImage;
+import org.thoughtcrime.securesms.giph.model.GiphyResponse;
+import org.thoughtcrime.securesms.net.ContentProxySelector;
+import org.thoughtcrime.securesms.util.AsyncLoader;
+import org.thoughtcrime.securesms.util.JsonUtils;
+
+import java.io.IOException;
+import java.util.LinkedList;
+import java.util.List;
+
+import okhttp3.OkHttpClient;
+import okhttp3.Request;
+import okhttp3.Response;
+
+public abstract class GiphyLoader extends AsyncLoader<List<GiphyImage>> {
+
+  private static final String TAG = GiphyLoader.class.getSimpleName();
+
+  public static int PAGE_SIZE = 100;
+
+  @Nullable private String searchString;
+
+  private final OkHttpClient client;
+
+  protected GiphyLoader(@NonNull Context context, @Nullable String searchString) {
+    super(context);
+    this.searchString = searchString;
+    this.client       = new OkHttpClient.Builder().proxySelector(new ContentProxySelector()).build();
+  }
+
+  @Override
+  public List<GiphyImage> loadInBackground() {
+    return loadPage(0);
+  }
+
+  public @NonNull List<GiphyImage> loadPage(int offset) {
+    try {
+      String url;
+
+      if (TextUtils.isEmpty(searchString)) url = String.format(getTrendingUrl(), offset);
+      else                                 url = String.format(getSearchUrl(), offset, Uri.encode(searchString));
+
+      Request  request  = new Request.Builder().url(url).build();
+      Response response = client.newCall(request).execute();
+
+      if (!response.isSuccessful()) {
+        throw new IOException("Unexpected code " + response);
+      }
+
+      GiphyResponse    giphyResponse = JsonUtils.fromJson(response.body().byteStream(), GiphyResponse.class);
+      List<GiphyImage> results       = Stream.of(giphyResponse.getData())
+                                             .filterNot(g -> TextUtils.isEmpty(g.getGifUrl()))
+                                             .filterNot(g -> TextUtils.isEmpty(g.getGifMmsUrl()))
+                                             .filterNot(g -> TextUtils.isEmpty(g.getStillUrl()))
+                                             .toList();
+
+      if (results == null) return new LinkedList<>();
+      else                 return results;
+
+    } catch (IOException e) {
+      Log.w(TAG, e);
+      return new LinkedList<>();
+    }
+  }
+
+  protected abstract String getTrendingUrl();
+  protected abstract String getSearchUrl();
+}

app/src/main/java/org/thoughtcrime/securesms/giph/net/GiphyStickerLoader.java

@@ -0,0 +1,23 @@
+package org.thoughtcrime.securesms.giph.net;
+
+
+import android.content.Context;
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+
+public class GiphyStickerLoader extends GiphyLoader {
+
+  public GiphyStickerLoader(@NonNull Context context, @Nullable String searchString) {
+    super(context, searchString);
+  }
+
+  @Override
+  protected String getTrendingUrl() {
+    return "https://api.giphy.com/v1/stickers/trending?api_key=3o6ZsYH6U6Eri53TXy&offset=%d&limit=" + PAGE_SIZE;
+  }
+
+  @Override
+  protected String getSearchUrl() {
+    return "https://api.giphy.com/v1/stickers/search?q=cat&api_key=3o6ZsYH6U6Eri53TXy&offset=%d&limit=" + PAGE_SIZE + "&q=%s";
+  }
+}

app/src/main/java/org/thoughtcrime/securesms/giph/ui/AspectRatioImageView.java

@@ -0,0 +1,118 @@
+/*
+ * Copyright (C) 2015 Twitter, 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
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package org.thoughtcrime.securesms.giph.ui;
+
+import android.content.Context;
+import androidx.appcompat.widget.AppCompatImageView;
+import android.util.AttributeSet;
+
+/**
+ * AspectRatioImageView maintains an aspect ratio by adjusting the width or height dimension. The
+ * aspect ratio (width to height ratio) and adjustment dimension can be configured.
+ */
+public class AspectRatioImageView extends AppCompatImageView {
+
+  private static final float DEFAULT_ASPECT_RATIO = 1.0f;
+  private static final int DEFAULT_ADJUST_DIMENSION = 0;
+  // defined by attrs.xml enum
+  static final int ADJUST_DIMENSION_HEIGHT = 0;
+  static final int ADJUST_DIMENSION_WIDTH = 1;
+
+  private double aspectRatio;         // width to height ratio
+  private int dimensionToAdjust;      // ADJUST_DIMENSION_HEIGHT or ADJUST_DIMENSION_WIDTH
+
+  public AspectRatioImageView(Context context) {
+    this(context, null);
+  }
+
+  public AspectRatioImageView(Context context, AttributeSet attrs) {
+    super(context, attrs);
+//    final TypedArray a = context.obtainStyledAttributes(attrs,
+//                                                        R.styleable.tw__AspectRatioImageView);
+//    try {
+//      aspectRatio = a.getFloat(R.styleable.tw__AspectRatioImageView_tw__image_aspect_ratio,
+//                               DEFAULT_ASPECT_RATIO);
+//      dimensionToAdjust
+//          = a.getInt(R.styleable.tw__AspectRatioImageView_tw__image_dimension_to_adjust,
+//                     DEFAULT_ADJUST_DIMENSION);
+//    } finally {
+//      a.recycle();
+//    }
+  }
+
+  public double getAspectRatio() {
+    return aspectRatio;
+  }
+
+  public int getDimensionToAdjust() {
+    return dimensionToAdjust;
+  }
+
+  /**
+   * Sets the aspect ratio that should be respected during measurement.
+   *
+   * @param aspectRatio desired width to height ratio
+   */
+  public void setAspectRatio(final double aspectRatio) {
+    this.aspectRatio = aspectRatio;
+  }
+
+  /**
+   * Resets the size to 0.
+   */
+  public void resetSize() {
+    if (getMeasuredWidth() == 0 && getMeasuredHeight() == 0) {
+      return;
+    }
+    measure(MeasureSpec.makeMeasureSpec(0, MeasureSpec.EXACTLY),
+            MeasureSpec.makeMeasureSpec(0, MeasureSpec.EXACTLY));
+    layout(0, 0, 0, 0);
+  }
+
+  @Override
+  protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
+    super.onMeasure(widthMeasureSpec, heightMeasureSpec);
+    int width = getMeasuredWidth();
+    int height = getMeasuredHeight();
+    if (dimensionToAdjust == ADJUST_DIMENSION_HEIGHT) {
+      height = calculateHeight(width, aspectRatio);
+    } else {
+      width = calculateWidth(height, aspectRatio);
+    }
+    setMeasuredDimension(width, height);
+  }
+
+  /**
+   * Returns the height that will satisfy the width to height aspect ratio, keeping the given
+   * width fixed.
+   */
+  int calculateHeight(int width, double ratio) {
+    if (ratio == 0) {
+      return 0;
+    }
+    return (int) Math.round(width / ratio);
+  }
+
+  /**
+   * Returns the width that will satisfy the width to height aspect ratio, keeping the given
+   * height fixed.
+   */
+  int calculateWidth(int height, double ratio) {
+    return (int) Math.round(height * ratio);
+  }
+}

app/src/main/java/org/thoughtcrime/securesms/giph/ui/GiphyActivity.java

@@ -0,0 +1,201 @@
+package org.thoughtcrime.securesms.giph.ui;
+
+
+import android.annotation.SuppressLint;
+import android.content.Context;
+import android.content.Intent;
+import android.net.Uri;
+import android.os.AsyncTask;
+import android.os.Build;
+import android.os.Bundle;
+
+import androidx.annotation.ColorInt;
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import com.google.android.material.tabs.TabLayout;
+
+import androidx.core.app.ActivityCompat;
+import androidx.fragment.app.Fragment;
+import androidx.fragment.app.FragmentManager;
+import androidx.fragment.app.FragmentPagerAdapter;
+import androidx.viewpager.widget.ViewPager;
+import org.thoughtcrime.securesms.logging.Log;
+import android.view.View;
+import android.widget.LinearLayout;
+import android.widget.Toast;
+
+import org.thoughtcrime.securesms.PassphraseRequiredActionBarActivity;
+import org.thoughtcrime.securesms.R;
+import org.thoughtcrime.securesms.providers.BlobProvider;
+import org.thoughtcrime.securesms.util.DynamicDarkToolbarTheme;
+import org.thoughtcrime.securesms.util.DynamicLanguage;
+import org.thoughtcrime.securesms.util.DynamicNoActionBarTheme;
+import org.thoughtcrime.securesms.util.DynamicTheme;
+import org.thoughtcrime.securesms.util.MediaUtil;
+import org.thoughtcrime.securesms.util.ViewUtil;
+
+import java.io.IOException;
+import java.util.concurrent.ExecutionException;
+
+public class GiphyActivity extends PassphraseRequiredActionBarActivity
+    implements GiphyActivityToolbar.OnLayoutChangedListener,
+               GiphyActivityToolbar.OnFilterChangedListener,
+               GiphyAdapter.OnItemClickListener
+{
+
+  private static final String TAG = GiphyActivity.class.getSimpleName();
+
+  public static final String EXTRA_IS_MMS = "extra_is_mms";
+  public static final String EXTRA_WIDTH  = "extra_width";
+  public static final String EXTRA_HEIGHT = "extra_height";
+  public static final String EXTRA_COLOR  = "extra_color";
+
+  private final DynamicTheme    dynamicTheme    = new DynamicDarkToolbarTheme();
+  private final DynamicLanguage dynamicLanguage = new DynamicLanguage();
+
+  private GiphyGifFragment     gifFragment;
+  private GiphyStickerFragment stickerFragment;
+  private boolean              forMms;
+
+  private GiphyAdapter.GiphyViewHolder finishingImage;
+
+  @Override
+  public void onPreCreate() {
+    dynamicTheme.onCreate(this);
+    dynamicLanguage.onCreate(this);
+  }
+
+  @Override
+  public void onCreate(Bundle bundle, boolean ready) {
+    setContentView(R.layout.giphy_activity);
+
+    initializeToolbar();
+    initializeResources();
+  }
+
+  private void initializeToolbar() {
+
+    GiphyActivityToolbar toolbar = ViewUtil.findById(this, R.id.giphy_toolbar);
+    toolbar.setOnFilterChangedListener(this);
+    toolbar.setOnLayoutChangedListener(this);
+    toolbar.setPersistence(GiphyActivityToolbarTextSecurePreferencesPersistence.fromContext(this));
+
+    final int conversationColor = getConversationColor();
+    toolbar.setBackgroundColor(conversationColor);
+    setStatusBarColor(conversationColor);
+
+    setSupportActionBar(toolbar);
+
+    getSupportActionBar().setDisplayHomeAsUpEnabled(false);
+    getSupportActionBar().setDisplayShowTitleEnabled(false);
+  }
+
+  private void initializeResources() {
+    ViewPager viewPager = ViewUtil.findById(this, R.id.giphy_pager);
+    TabLayout tabLayout = ViewUtil.findById(this, R.id.tab_layout);
+
+    this.gifFragment     = new GiphyGifFragment();
+    this.stickerFragment = new GiphyStickerFragment();
+    this.forMms          = getIntent().getBooleanExtra(EXTRA_IS_MMS, false);
+
+    gifFragment.setClickListener(this);
+    stickerFragment.setClickListener(this);
+
+    viewPager.setAdapter(new GiphyFragmentPagerAdapter(this, getSupportFragmentManager(),
+                                                       gifFragment, stickerFragment));
+    tabLayout.setupWithViewPager(viewPager);
+    tabLayout.setBackgroundColor(getConversationColor());
+  }
+
+  private @ColorInt int getConversationColor() {
+    return getIntent().getIntExtra(EXTRA_COLOR, ActivityCompat.getColor(this, R.color.signal_primary));
+  }
+
+  @Override
+  public void onFilterChanged(String filter) {
+    this.gifFragment.setSearchString(filter);
+    this.stickerFragment.setSearchString(filter);
+  }
+
+  @Override
+  public void onLayoutChanged(boolean gridLayout) {
+    gifFragment.setLayoutManager(gridLayout);
+    stickerFragment.setLayoutManager(gridLayout);
+  }
+
+  @SuppressLint("StaticFieldLeak")
+  @Override
+  public void onClick(final GiphyAdapter.GiphyViewHolder viewHolder) {
+    if (finishingImage != null) finishingImage.gifProgress.setVisibility(View.GONE);
+    finishingImage = viewHolder;
+    finishingImage.gifProgress.setVisibility(View.VISIBLE);
+
+    new AsyncTask<Void, Void, Uri>() {
+      @Override
+      protected Uri doInBackground(Void... params) {
+        try {
+          byte[] data = viewHolder.getData(forMms);
+
+          return BlobProvider.getInstance()
+                             .forData(data)
+                             .withMimeType(MediaUtil.IMAGE_GIF)
+                             .createForSingleSessionOnDisk(GiphyActivity.this);
+        } catch (InterruptedException | ExecutionException | IOException e) {
+          Log.w(TAG, e);
+          return null;
+        }
+      }
+
+      protected void onPostExecute(@Nullable Uri uri) {
+        if (uri == null) {
+          Toast.makeText(GiphyActivity.this, R.string.GiphyActivity_error_while_retrieving_full_resolution_gif, Toast.LENGTH_LONG).show();
+        } else if (viewHolder == finishingImage) {
+          Intent intent = new Intent();
+          intent.setData(uri);
+          intent.putExtra(EXTRA_WIDTH, viewHolder.image.getGifWidth());
+          intent.putExtra(EXTRA_HEIGHT, viewHolder.image.getGifHeight());
+          setResult(RESULT_OK, intent);
+          finish();
+        } else {
+          Log.w(TAG, "Resolved Uri is no longer the selected element...");
+        }
+      }
+    }.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
+  }
+
+  private static class GiphyFragmentPagerAdapter extends FragmentPagerAdapter {
+
+    private final Context              context;
+    private final GiphyGifFragment     gifFragment;
+    private final GiphyStickerFragment stickerFragment;
+
+    private GiphyFragmentPagerAdapter(@NonNull Context context,
+                                      @NonNull FragmentManager fragmentManager,
+                                      @NonNull GiphyGifFragment gifFragment,
+                                      @NonNull GiphyStickerFragment stickerFragment)
+    {
+      super(fragmentManager);
+      this.context         = context.getApplicationContext();
+      this.gifFragment     = gifFragment;
+      this.stickerFragment = stickerFragment;
+    }
+
+    @Override
+    public Fragment getItem(int position) {
+      if (position == 0) return gifFragment;
+      else               return stickerFragment;
+    }
+
+    @Override
+    public int getCount() {
+      return 2;
+    }
+
+    @Override
+    public CharSequence getPageTitle(int position) {
+      if (position == 0) return context.getString(R.string.GiphyFragmentPagerAdapter_gifs);
+      else               return context.getString(R.string.GiphyFragmentPagerAdapter_stickers);
+    }
+  }
+
+}

app/src/main/java/org/thoughtcrime/securesms/giph/ui/GiphyActivityToolbar.java

@@ -0,0 +1,203 @@
+package org.thoughtcrime.securesms.giph.ui;
+
+
+import android.content.Context;
+import android.graphics.Rect;
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.appcompat.widget.Toolbar;
+import android.text.Editable;
+import android.text.InputType;
+import android.text.TextWatcher;
+import android.util.AttributeSet;
+import android.view.KeyEvent;
+import android.view.TouchDelegate;
+import android.view.View;
+import android.view.inputmethod.EditorInfo;
+import android.view.inputmethod.InputMethodManager;
+import android.widget.EditText;
+import android.widget.ImageView;
+import android.widget.LinearLayout;
+import android.widget.TextView;
+
+import org.thoughtcrime.securesms.R;
+import org.thoughtcrime.securesms.components.AnimatingToggle;
+
+public class GiphyActivityToolbar extends Toolbar {
+
+  @Nullable private OnFilterChangedListener filterListener;
+  @Nullable private OnLayoutChangedListener layoutListener;
+
+  private EditText        searchText;
+  private AnimatingToggle toggle;
+  private ImageView       action;
+  private ImageView       clearToggle;
+  private LinearLayout    toggleContainer;
+  private View            listLayoutToggle;
+  private View            gridLayoutToggle;
+  private Persistence     persistence;
+
+  public GiphyActivityToolbar(Context context) {
+    this(context, null);
+  }
+
+  public GiphyActivityToolbar(Context context, AttributeSet attrs) {
+    this(context, attrs, R.attr.toolbarStyle);
+  }
+
+  public GiphyActivityToolbar(Context context, AttributeSet attrs, int defStyleAttr) {
+    super(context, attrs, defStyleAttr);
+    inflate(context, R.layout.giphy_activity_toolbar, this);
+
+    this.action           = findViewById(R.id.action_icon);
+    this.searchText       = findViewById(R.id.search_view);
+    this.toggle           = findViewById(R.id.button_toggle);
+    this.clearToggle      = findViewById(R.id.search_clear);
+    this.toggleContainer  = findViewById(R.id.toggle_container);
+    this.listLayoutToggle = findViewById(R.id.view_stream);
+    this.gridLayoutToggle = findViewById(R.id.view_grid);
+
+    setupGridLayoutToggles();
+
+    this.clearToggle.setOnClickListener(new View.OnClickListener() {
+      @Override
+      public void onClick(View v) {
+        searchText.setText("");
+        clearToggle.setVisibility(View.INVISIBLE);
+      }
+    });
+
+    this.searchText.addTextChangedListener(new TextWatcher() {
+      @Override
+      public void beforeTextChanged(CharSequence s, int start, int count, int after) {
+
+      }
+
+      @Override
+      public void onTextChanged(CharSequence s, int start, int before, int count) {
+
+      }
+
+      @Override
+      public void afterTextChanged(Editable s) {
+        if (SearchUtil.isEmpty(searchText)) clearToggle.setVisibility(View.INVISIBLE);
+        else                                clearToggle.setVisibility(View.VISIBLE);
+
+        notifyListener();
+      }
+    });
+
+    this.searchText.setOnEditorActionListener(new TextView.OnEditorActionListener() {
+      @Override
+      public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {
+        if (actionId == EditorInfo.IME_ACTION_SEARCH) {
+          InputMethodManager inputMethodManager = (InputMethodManager)getContext().getSystemService(Context.INPUT_METHOD_SERVICE);
+          inputMethodManager.hideSoftInputFromWindow(searchText.getWindowToken(), 0);
+        }
+
+        return false;
+      }
+    });
+
+    setLogo(null);
+    setNavigationIcon(null);
+    setContentInsetStartWithNavigation(0);
+    expandTapArea(this, action);
+  }
+
+  public void setPersistence(@NonNull Persistence persistence) {
+    this.persistence = persistence;
+    displayTogglingView(persistence.getGridSelected() ? listLayoutToggle : gridLayoutToggle);
+  }
+
+  private void setupGridLayoutToggles() {
+    setUpGridToggle(listLayoutToggle, gridLayoutToggle, false);
+    setUpGridToggle(gridLayoutToggle, listLayoutToggle, true);
+    displayTogglingView(gridLayoutToggle);
+  }
+
+  private void setUpGridToggle(View gridToggle, View otherToggle, boolean gridLayout) {
+    gridToggle.setOnClickListener(v -> {
+      displayTogglingView(otherToggle);
+      if (layoutListener != null) {
+        layoutListener.onLayoutChanged(gridLayout);
+      }
+      if (persistence != null) {
+        persistence.setGridSelected(gridLayout);
+      }
+    });
+  }
+
+  @Override
+  public void setNavigationIcon(int resId) {
+    action.setImageResource(resId);
+  }
+
+  public void clear() {
+    searchText.setText("");
+    notifyListener();
+  }
+
+  public void setOnLayoutChangedListener(@Nullable OnLayoutChangedListener layoutListener) {
+    this.layoutListener = layoutListener;
+  }
+
+  public void setOnFilterChangedListener(@Nullable  OnFilterChangedListener filterListener) {
+    this.filterListener = filterListener;
+  }
+
+  private void notifyListener() {
+    if (filterListener != null) filterListener.onFilterChanged(searchText.getText().toString());
+  }
+
+  private void displayTogglingView(View view) {
+    toggle.display(view);
+    expandTapArea(toggleContainer, view);
+  }
+
+  private void expandTapArea(final View container, final View child) {
+    final int padding = getResources().getDimensionPixelSize(R.dimen.contact_selection_actions_tap_area);
+
+    container.post(new Runnable() {
+      @Override
+      public void run() {
+        Rect rect = new Rect();
+        child.getHitRect(rect);
+
+        rect.top -= padding;
+        rect.left -= padding;
+        rect.right += padding;
+        rect.bottom += padding;
+
+        container.setTouchDelegate(new TouchDelegate(rect, child));
+      }
+    });
+  }
+
+  private static class SearchUtil {
+    public static boolean isTextInput(EditText editText) {
+      return (editText.getInputType() & InputType.TYPE_MASK_CLASS) == InputType.TYPE_CLASS_TEXT;
+    }
+
+    public static boolean isPhoneInput(EditText editText) {
+      return (editText.getInputType() & InputType.TYPE_MASK_CLASS) == InputType.TYPE_CLASS_PHONE;
+    }
+
+    public static boolean isEmpty(EditText editText) {
+      return editText.getText().length() <= 0;
+    }
+  }
+
+  public interface OnFilterChangedListener {
+    void onFilterChanged(String filter);
+  }
+
+  public interface OnLayoutChangedListener {
+    void onLayoutChanged(boolean gridLayout);
+  }
+
+  public interface Persistence {
+    boolean getGridSelected();
+    void setGridSelected(boolean isGridSelected);
+  }
+}

app/src/main/java/org/thoughtcrime/securesms/giph/ui/GiphyActivityToolbarTextSecurePreferencesPersistence.java

@@ -0,0 +1,28 @@
+package org.thoughtcrime.securesms.giph.ui;
+
+import android.content.Context;
+
+import org.thoughtcrime.securesms.util.TextSecurePreferences;
+
+class GiphyActivityToolbarTextSecurePreferencesPersistence implements GiphyActivityToolbar.Persistence {
+
+  static GiphyActivityToolbar.Persistence fromContext(Context context) {
+    return new GiphyActivityToolbarTextSecurePreferencesPersistence(context.getApplicationContext());
+  }
+
+  private final Context context;
+
+  private GiphyActivityToolbarTextSecurePreferencesPersistence(Context context) {
+    this.context = context;
+  }
+
+  @Override
+  public boolean getGridSelected() {
+    return TextSecurePreferences.isGifSearchInGridLayout(context);
+  }
+
+  @Override
+  public void setGridSelected(boolean isGridSelected) {
+    TextSecurePreferences.setIsGifSearchInGridLayout(context, isGridSelected);
+  }
+}

app/src/main/java/org/thoughtcrime/securesms/giph/ui/GiphyAdapter.java

@@ -0,0 +1,193 @@
+package org.thoughtcrime.securesms.giph.ui;
+
+
+import android.content.Context;
+import android.graphics.drawable.ColorDrawable;
+import android.graphics.drawable.Drawable;
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.recyclerview.widget.RecyclerView;
+import org.thoughtcrime.securesms.logging.Log;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.ProgressBar;
+
+import com.bumptech.glide.RequestBuilder;
+import com.bumptech.glide.load.DataSource;
+import com.bumptech.glide.load.engine.DiskCacheStrategy;
+import com.bumptech.glide.load.engine.GlideException;
+import com.bumptech.glide.load.resource.drawable.DrawableTransitionOptions;
+import com.bumptech.glide.load.resource.gif.GifDrawable;
+import com.bumptech.glide.request.RequestListener;
+import com.bumptech.glide.request.target.Target;
+import com.bumptech.glide.util.ByteBufferUtil;
+
+import org.thoughtcrime.securesms.R;
+import org.thoughtcrime.securesms.color.MaterialColor;
+import org.thoughtcrime.securesms.giph.model.GiphyImage;
+import org.thoughtcrime.securesms.giph.model.ChunkedImageUrl;
+import org.thoughtcrime.securesms.mms.GlideApp;
+import org.thoughtcrime.securesms.mms.GlideRequests;
+import org.thoughtcrime.securesms.util.Util;
+import org.thoughtcrime.securesms.util.ViewUtil;
+
+import java.util.List;
+import java.util.concurrent.ExecutionException;
+
+
+class GiphyAdapter extends RecyclerView.Adapter<GiphyAdapter.GiphyViewHolder> {
+
+  private static final String TAG = GiphyAdapter.class.getSimpleName();
+
+  private final Context       context;
+  private final GlideRequests glideRequests;
+
+  private List<GiphyImage>     images;
+  private OnItemClickListener  listener;
+
+  class GiphyViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener, RequestListener<Drawable> {
+
+    public AspectRatioImageView thumbnail;
+    public GiphyImage           image;
+    public ProgressBar          gifProgress;
+    public volatile boolean     modelReady;
+
+    GiphyViewHolder(View view) {
+      super(view);
+      thumbnail   = ViewUtil.findById(view, R.id.thumbnail);
+      gifProgress = ViewUtil.findById(view, R.id.gif_progress);
+      thumbnail.setOnClickListener(this);
+      gifProgress.setVisibility(View.GONE);
+    }
+
+    @Override
+    public void onClick(View v) {
+      if (listener != null) listener.onClick(this);
+    }
+
+    @Override
+    public boolean onLoadFailed(@Nullable GlideException e, Object model, Target<Drawable> target, boolean isFirstResource) {
+      Log.w(TAG, e);
+
+      synchronized (this) {
+        if (new ChunkedImageUrl(image.getGifUrl(), image.getGifSize()).equals(model)) {
+          this.modelReady = true;
+          notifyAll();
+        }
+      }
+
+      return false;
+    }
+
+    @Override
+    public boolean onResourceReady(Drawable resource, Object model, Target<Drawable> target, DataSource dataSource, boolean isFirstResource) {
+      synchronized (this) {
+        if (new ChunkedImageUrl(image.getGifUrl(), image.getGifSize()).equals(model)) {
+          this.modelReady = true;
+          notifyAll();
+        }
+      }
+
+      return false;
+    }
+
+
+    public byte[] getData(boolean forMms) throws ExecutionException, InterruptedException {
+      synchronized (this) {
+        while (!modelReady) {
+          Util.wait(this, 0);
+        }
+      }
+
+      GifDrawable drawable = glideRequests.asGif()
+                                          .load(forMms ? new ChunkedImageUrl(image.getGifMmsUrl(), image.getMmsGifSize()) :
+                                                         new ChunkedImageUrl(image.getGifUrl(), image.getGifSize()))
+                                          .submit(Target.SIZE_ORIGINAL, Target.SIZE_ORIGINAL)
+                                          .get();
+
+      return ByteBufferUtil.toBytes(drawable.getBuffer());
+    }
+
+    public synchronized void setModelReady() {
+      this.modelReady = true;
+      notifyAll();
+    }
+  }
+
+  GiphyAdapter(@NonNull Context context, @NonNull GlideRequests glideRequests, @NonNull List<GiphyImage> images) {
+    this.context       = context.getApplicationContext();
+    this.glideRequests = glideRequests;
+    this.images        = images;
+  }
+
+  public void setImages(@NonNull List<GiphyImage> images) {
+    this.images = images;
+    notifyDataSetChanged();
+  }
+
+  public void addImages(List<GiphyImage> images) {
+    this.images.addAll(images);
+    notifyDataSetChanged();
+  }
+
+  @Override
+  public @NonNull GiphyViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
+    View itemView = LayoutInflater.from(parent.getContext())
+                                  .inflate(R.layout.giphy_thumbnail, parent, false);
+
+    return new GiphyViewHolder(itemView);
+  }
+
+  @Override
+  public void onBindViewHolder(@NonNull GiphyViewHolder holder, int position) {
+    GiphyImage image = images.get(position);
+
+    holder.modelReady = false;
+    holder.image      = image;
+    holder.thumbnail.setAspectRatio(image.getGifAspectRatio());
+    holder.gifProgress.setVisibility(View.GONE);
+
+    RequestBuilder<Drawable> thumbnailRequest = GlideApp.with(context)
+                                                        .load(new ChunkedImageUrl(image.getStillUrl(), image.getStillSize()))
+                                                        .diskCacheStrategy(DiskCacheStrategy.ALL);
+
+    if (Util.isLowMemory(context)) {
+      glideRequests.load(new ChunkedImageUrl(image.getStillUrl(), image.getStillSize()))
+                   .placeholder(new ColorDrawable(Util.getRandomElement(MaterialColor.values()).toConversationColor(context)))
+                   .diskCacheStrategy(DiskCacheStrategy.ALL)
+                   .transition(DrawableTransitionOptions.withCrossFade())
+                   .listener(holder)
+                   .into(holder.thumbnail);
+
+      holder.setModelReady();
+    } else {
+      glideRequests.load(new ChunkedImageUrl(image.getGifUrl(), image.getGifSize()))
+                   .thumbnail(thumbnailRequest)
+                   .placeholder(new ColorDrawable(Util.getRandomElement(MaterialColor.values()).toConversationColor(context)))
+                   .diskCacheStrategy(DiskCacheStrategy.ALL)
+                   .transition(DrawableTransitionOptions.withCrossFade())
+                   .listener(holder)
+                   .into(holder.thumbnail);
+    }
+  }
+
+  @Override
+  public void onViewRecycled(@NonNull GiphyViewHolder holder) {
+    super.onViewRecycled(holder);
+    glideRequests.clear(holder.thumbnail);
+  }
+
+  @Override
+  public int getItemCount() {
+    return images.size();
+  }
+
+  public void setListener(OnItemClickListener listener) {
+    this.listener = listener;
+  }
+
+  public interface OnItemClickListener {
+    void onClick(GiphyViewHolder viewHolder);
+  }
+}

app/src/main/java/org/thoughtcrime/securesms/giph/ui/GiphyFragment.java

@@ -0,0 +1,126 @@
+package org.thoughtcrime.securesms.giph.ui;
+
+import android.os.AsyncTask;
+import android.os.Bundle;
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.fragment.app.Fragment;
+import androidx.loader.app.LoaderManager;
+import androidx.loader.content.Loader;
+import androidx.recyclerview.widget.DefaultItemAnimator;
+import androidx.recyclerview.widget.LinearLayoutManager;
+import androidx.recyclerview.widget.RecyclerView;
+import androidx.recyclerview.widget.StaggeredGridLayoutManager;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.ProgressBar;
+import android.widget.TextView;
+
+import org.thoughtcrime.securesms.R;
+import org.thoughtcrime.securesms.giph.model.GiphyImage;
+import org.thoughtcrime.securesms.giph.net.GiphyLoader;
+import org.thoughtcrime.securesms.giph.util.InfiniteScrollListener;
+import org.thoughtcrime.securesms.mms.GlideApp;
+import org.thoughtcrime.securesms.util.TextSecurePreferences;
+import org.thoughtcrime.securesms.util.ViewUtil;
+
+import java.util.LinkedList;
+import java.util.List;
+
+public abstract class GiphyFragment extends Fragment implements LoaderManager.LoaderCallbacks<List<GiphyImage>>, GiphyAdapter.OnItemClickListener {
+
+  private static final String TAG = GiphyFragment.class.getSimpleName();
+
+  private GiphyAdapter                     giphyAdapter;
+  private RecyclerView                     recyclerView;
+  private ProgressBar                      loadingProgress;
+  private TextView                         noResultsView;
+  private GiphyAdapter.OnItemClickListener listener;
+
+  protected String searchString;
+
+  @Override
+  public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup viewGroup, Bundle bundle) {
+    ViewGroup container = ViewUtil.inflate(inflater, viewGroup, R.layout.giphy_fragment);
+    this.recyclerView    = ViewUtil.findById(container, R.id.giphy_list);
+    this.loadingProgress = ViewUtil.findById(container, R.id.loading_progress);
+    this.noResultsView   = ViewUtil.findById(container, R.id.no_results);
+
+    return container;
+  }
+
+  @Override
+  public void onActivityCreated(Bundle bundle) {
+    super.onActivityCreated(bundle);
+
+    this.giphyAdapter = new GiphyAdapter(getActivity(), GlideApp.with(this), new LinkedList<>());
+    this.giphyAdapter.setListener(this);
+
+    setLayoutManager(TextSecurePreferences.isGifSearchInGridLayout(getContext()));
+    this.recyclerView.setItemAnimator(new DefaultItemAnimator());
+    this.recyclerView.setAdapter(giphyAdapter);
+    this.recyclerView.addOnScrollListener(new GiphyScrollListener());
+
+    getLoaderManager().initLoader(0, null, this);
+  }
+
+  @Override
+  public void onLoadFinished(@NonNull Loader<List<GiphyImage>> loader, @NonNull List<GiphyImage> data) {
+    this.loadingProgress.setVisibility(View.GONE);
+
+    if (data.isEmpty()) noResultsView.setVisibility(View.VISIBLE);
+    else                noResultsView.setVisibility(View.GONE);
+
+    this.giphyAdapter.setImages(data);
+  }
+
+  @Override
+  public void onLoaderReset(@NonNull Loader<List<GiphyImage>> loader) {
+    noResultsView.setVisibility(View.GONE);
+    this.giphyAdapter.setImages(new LinkedList<GiphyImage>());
+  }
+
+  public void setLayoutManager(boolean gridLayout) {
+    recyclerView.setLayoutManager(getLayoutManager(gridLayout));
+  }
+
+  private RecyclerView.LayoutManager getLayoutManager(boolean gridLayout) {
+    return gridLayout ? new StaggeredGridLayoutManager(2, StaggeredGridLayoutManager.VERTICAL)
+                      : new LinearLayoutManager(getActivity());
+  }
+
+  public void setClickListener(GiphyAdapter.OnItemClickListener listener) {
+    this.listener = listener;
+  }
+
+  public void setSearchString(@Nullable String searchString) {
+    this.searchString = searchString;
+    this.noResultsView.setVisibility(View.GONE);
+    this.getLoaderManager().restartLoader(0, null, this);
+  }
+
+  @Override
+  public void onClick(GiphyAdapter.GiphyViewHolder viewHolder) {
+    if (listener != null) listener.onClick(viewHolder);
+  }
+
+  private class GiphyScrollListener extends InfiniteScrollListener {
+    @Override
+    public void onLoadMore(final int currentPage) {
+      final Loader<List<GiphyImage>> loader = getLoaderManager().getLoader(0);
+      if (loader == null) return;
+
+      new AsyncTask<Void, Void, List<GiphyImage>>() {
+        @Override
+        protected List<GiphyImage> doInBackground(Void... params) {
+          return ((GiphyLoader)loader).loadPage(currentPage * GiphyLoader.PAGE_SIZE);
+        }
+
+        protected void onPostExecute(List<GiphyImage> images) {
+          giphyAdapter.addImages(images);
+        }
+      }.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
+    }
+  }
+}

app/src/main/java/org/thoughtcrime/securesms/giph/ui/GiphyGifFragment.java

@@ -0,0 +1,20 @@
+package org.thoughtcrime.securesms.giph.ui;
+
+
+import android.os.Bundle;
+import androidx.annotation.NonNull;
+import androidx.loader.content.Loader;
+
+import org.thoughtcrime.securesms.giph.model.GiphyImage;
+import org.thoughtcrime.securesms.giph.net.GiphyGifLoader;
+
+import java.util.List;
+
+public class GiphyGifFragment extends GiphyFragment {
+
+  @Override
+  public @NonNull Loader<List<GiphyImage>> onCreateLoader(int id, Bundle args) {
+    return new GiphyGifLoader(getActivity(), searchString);
+  }
+
+}

app/src/main/java/org/thoughtcrime/securesms/giph/ui/GiphyStickerFragment.java

@@ -0,0 +1,18 @@
+package org.thoughtcrime.securesms.giph.ui;
+
+
+import android.os.Bundle;
+import androidx.annotation.NonNull;
+import androidx.loader.content.Loader;
+
+import org.thoughtcrime.securesms.giph.model.GiphyImage;
+import org.thoughtcrime.securesms.giph.net.GiphyStickerLoader;
+
+import java.util.List;
+
+public class GiphyStickerFragment extends GiphyFragment {
+  @Override
+  public @NonNull Loader<List<GiphyImage>> onCreateLoader(int id, Bundle args) {
+    return new GiphyStickerLoader(getActivity(), searchString);
+  }
+}

app/src/main/java/org/thoughtcrime/securesms/giph/util/InfiniteScrollListener.java

@@ -0,0 +1,49 @@
+// From https://gist.github.com/mipreamble/b6d4b3d65b0b4775a22e#file-recyclerviewpositionhelper-java
+
+package org.thoughtcrime.securesms.giph.util;
+
+import androidx.annotation.NonNull;
+import androidx.recyclerview.widget.RecyclerView;
+
+public abstract class InfiniteScrollListener extends RecyclerView.OnScrollListener {
+
+  public static String TAG = InfiniteScrollListener.class.getSimpleName();
+
+  private int     previousTotal    = 0;    // The total number of items in the dataset after the last load
+  private boolean loading          = true; // True if we are still waiting for the last set of data to load.
+  private int     visibleThreshold = 5;    // The minimum amount of items to have below your current scroll position before loading more.
+
+  int firstVisibleItem, visibleItemCount, totalItemCount;
+
+  private int currentPage = 1;
+
+  @Override
+  public void onScrolled(@NonNull RecyclerView recyclerView, int dx, int dy) {
+    super.onScrolled(recyclerView, dx, dy);
+
+    RecyclerViewPositionHelper recyclerViewPositionHelper = RecyclerViewPositionHelper.createHelper(recyclerView);
+
+    visibleItemCount = recyclerView.getChildCount();
+    totalItemCount   = recyclerViewPositionHelper.getItemCount();
+    firstVisibleItem = recyclerViewPositionHelper.findFirstVisibleItemPosition();
+
+    if (loading) {
+      if (totalItemCount > previousTotal) {
+        loading = false;
+        previousTotal = totalItemCount;
+      }
+    }
+    if (!loading && (totalItemCount - visibleItemCount)
+        <= (firstVisibleItem + visibleThreshold)) {
+      // End has been reached
+      // Do something
+      currentPage++;
+
+      onLoadMore(currentPage);
+
+      loading = true;
+    }
+  }
+
+  public abstract void onLoadMore(int currentPage);
+}

app/src/main/java/org/thoughtcrime/securesms/giph/util/RecyclerViewPositionHelper.java

@@ -0,0 +1,115 @@
+// From https://gist.github.com/mipreamble/b6d4b3d65b0b4775a22e#file-recyclerviewpositionhelper-java
+
+package org.thoughtcrime.securesms.giph.util;
+
+
+import androidx.recyclerview.widget.OrientationHelper;
+import androidx.recyclerview.widget.RecyclerView;
+import android.view.View;
+
+public class RecyclerViewPositionHelper {
+
+  final RecyclerView recyclerView;
+  final RecyclerView.LayoutManager layoutManager;
+
+  RecyclerViewPositionHelper(RecyclerView recyclerView) {
+    this.recyclerView = recyclerView;
+    this.layoutManager = recyclerView.getLayoutManager();
+  }
+
+  public static RecyclerViewPositionHelper createHelper(RecyclerView recyclerView) {
+    if (recyclerView == null) {
+      throw new NullPointerException("Recycler View is null");
+    }
+    return new RecyclerViewPositionHelper(recyclerView);
+  }
+
+  /**
+   * Returns the adapter item count.
+   *
+   * @return The total number on items in a layout manager
+   */
+  public int getItemCount() {
+    return layoutManager == null ? 0 : layoutManager.getItemCount();
+  }
+
+  /**
+   * Returns the adapter position of the first visible view. This position does not include
+   * adapter changes that were dispatched after the last layout pass.
+   *
+   * @return The adapter position of the first visible item or {@link RecyclerView#NO_POSITION} if
+   * there aren't any visible items.
+   */
+  public int findFirstVisibleItemPosition() {
+    final View child = findOneVisibleChild(0, layoutManager.getChildCount(), false, true);
+    return child == null ? RecyclerView.NO_POSITION : recyclerView.getChildAdapterPosition(child);
+  }
+
+  /**
+   * Returns the adapter position of the first fully visible view. This position does not include
+   * adapter changes that were dispatched after the last layout pass.
+   *
+   * @return The adapter position of the first fully visible item or
+   * {@link RecyclerView#NO_POSITION} if there aren't any visible items.
+   */
+  public int findFirstCompletelyVisibleItemPosition() {
+    final View child = findOneVisibleChild(0, layoutManager.getChildCount(), true, false);
+    return child == null ? RecyclerView.NO_POSITION : recyclerView.getChildAdapterPosition(child);
+  }
+
+  /**
+   * Returns the adapter position of the last visible view. This position does not include
+   * adapter changes that were dispatched after the last layout pass.
+   *
+   * @return The adapter position of the last visible view or {@link RecyclerView#NO_POSITION} if
+   * there aren't any visible items
+   */
+  public int findLastVisibleItemPosition() {
+    final View child = findOneVisibleChild(layoutManager.getChildCount() - 1, -1, false, true);
+    return child == null ? RecyclerView.NO_POSITION : recyclerView.getChildAdapterPosition(child);
+  }
+
+  /**
+   * Returns the adapter position of the last fully visible view. This position does not include
+   * adapter changes that were dispatched after the last layout pass.
+   *
+   * @return The adapter position of the last fully visible view or
+   * {@link RecyclerView#NO_POSITION} if there aren't any visible items.
+   */
+  public int findLastCompletelyVisibleItemPosition() {
+    final View child = findOneVisibleChild(layoutManager.getChildCount() - 1, -1, true, false);
+    return child == null ? RecyclerView.NO_POSITION : recyclerView.getChildAdapterPosition(child);
+  }
+
+  View findOneVisibleChild(int fromIndex, int toIndex, boolean completelyVisible,
+                           boolean acceptPartiallyVisible) {
+    OrientationHelper helper;
+    if (layoutManager.canScrollVertically()) {
+      helper = OrientationHelper.createVerticalHelper(layoutManager);
+    } else {
+      helper = OrientationHelper.createHorizontalHelper(layoutManager);
+    }
+
+    final int start = helper.getStartAfterPadding();
+    final int end = helper.getEndAfterPadding();
+    final int next = toIndex > fromIndex ? 1 : -1;
+    View partiallyVisible = null;
+    for (int i = fromIndex; i != toIndex; i += next) {
+      final View child = layoutManager.getChildAt(i);
+      final int childStart = helper.getDecoratedStart(child);
+      final int childEnd = helper.getDecoratedEnd(child);
+      if (childStart < end && childEnd > start) {
+        if (completelyVisible) {
+          if (childStart >= start && childEnd <= end) {
+            return child;
+          } else if (acceptPartiallyVisible && partiallyVisible == null) {
+            partiallyVisible = child;
+          }
+        } else {
+          return child;
+        }
+      }
+    }
+    return partiallyVisible;
+  }
+}