contact selection reeemix

1) RecyclerView-based, with better long scroller
   and more material-inspired look.
2) Add badge for Signal users to contact selection
   list.

// FREEBIE

src/org/thoughtcrime/securesms/ContactSelectionListFragment.java

@@ -18,30 +18,36 @@ package org.thoughtcrime.securesms;
 
 
 import android.database.Cursor;
+import android.graphics.Canvas;
+import android.graphics.Rect;
 import android.os.Build;
+import android.os.Build.VERSION;
 import android.os.Bundle;
 import android.support.annotation.NonNull;
 import android.support.v4.app.Fragment;
 import android.support.v4.app.LoaderManager;
 import android.support.v4.content.Loader;
-import android.support.v4.widget.CursorAdapter;
+import android.support.v4.view.ViewCompat;
 import android.support.v4.widget.SwipeRefreshLayout;
+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.AdapterView;
 import android.widget.TextView;
 
+import org.thoughtcrime.securesms.components.RecyclerViewFastScroller;
 import org.thoughtcrime.securesms.contacts.ContactSelectionListAdapter;
 import org.thoughtcrime.securesms.contacts.ContactSelectionListItem;
 import org.thoughtcrime.securesms.contacts.ContactsCursorLoader;
+import org.thoughtcrime.securesms.database.CursorRecyclerViewAdapter;
+import org.thoughtcrime.securesms.util.ViewUtil;
 
+import java.util.HashMap;
 import java.util.LinkedList;
 import java.util.List;
 import java.util.Map;
 
-import se.emilsjolander.stickylistheaders.StickyListHeadersListView;
-
 /**
  * Fragment for selecting a one or more contacts from a list.
  *
@@ -65,9 +71,10 @@ public class ContactSelectionListFragment extends    Fragment
 
   private Map<Long, String>         selectedContacts;
   private OnContactSelectedListener onContactSelectedListener;
-  private StickyListHeadersListView listView;
   private SwipeRefreshLayout        swipeRefresh;
   private String                    cursorFilter;
+  private RecyclerView              recyclerView;
+  private RecyclerViewFastScroller  fastScroller;
 
   @Override
   public void onActivityCreated(Bundle icicle) {
@@ -89,13 +96,12 @@ public class ContactSelectionListFragment extends    Fragment
   public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
     View view = inflater.inflate(R.layout.contact_selection_list_fragment, container, false);
 
-    emptyText      = (TextView)                  view.findViewById(android.R.id.empty);
-    swipeRefresh   = (SwipeRefreshLayout)        view.findViewById(R.id.swipe_refresh);
-    listView       = (StickyListHeadersListView) view.findViewById(android.R.id.list);
-    listView.setFocusable(true);
-    listView.setFastScrollEnabled(true);
-    listView.setDrawingListUnderStickyHeader(false);
-    listView.setOnItemClickListener(new ListClickListener());
+    emptyText    = ViewUtil.findById(view, android.R.id.empty);
+    recyclerView = ViewUtil.findById(view, R.id.recycler_view);
+    swipeRefresh = ViewUtil.findById(view, R.id.swipe_refresh);
+    fastScroller = ViewUtil.findById(view, R.id.fast_scroller);
+    recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
+    fastScroller.setRecyclerView(recyclerView);
 
     swipeRefresh.setEnabled(getActivity().getIntent().getBooleanExtra(REFRESHABLE, true) &&
                             Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN);
@@ -117,9 +123,13 @@ public class ContactSelectionListFragment extends    Fragment
   }
 
   private void initializeCursor() {
-    ContactSelectionListAdapter adapter = new ContactSelectionListAdapter(getActivity(), null, isMulti());
+    ContactSelectionListAdapter adapter = new ContactSelectionListAdapter(getActivity(),
+                                                                          null,
+                                                                          new ListClickListener(),
+                                                                          isMulti());
     selectedContacts = adapter.getSelectedContacts();
-    listView.setAdapter(adapter);
+    recyclerView.setAdapter(adapter);
+    recyclerView.addItemDecoration(new StickyHeaderDecoration(adapter, true));
     this.getLoaderManager().initLoader(0, null, this);
   }
 
@@ -147,19 +157,18 @@ public class ContactSelectionListFragment extends    Fragment
 
   @Override
   public void onLoadFinished(Loader<Cursor> loader, Cursor data) {
-    ((CursorAdapter) listView.getAdapter()).changeCursor(data);
+    ((CursorRecyclerViewAdapter) recyclerView.getAdapter()).changeCursor(data);
     emptyText.setText(R.string.contact_selection_group_activity__no_contacts);
   }
 
   @Override
   public void onLoaderReset(Loader<Cursor> loader) {
-    ((CursorAdapter) listView.getAdapter()).changeCursor(null);
+    ((CursorRecyclerViewAdapter) recyclerView.getAdapter()).changeCursor(null);
   }
 
-  private class ListClickListener implements AdapterView.OnItemClickListener {
+  private class ListClickListener implements ContactSelectionListAdapter.ItemClickListener {
     @Override
-    public void onItemClick(AdapterView<?> l, View v, int position, long id) {
-      ContactSelectionListItem contact = (ContactSelectionListItem)v;
+    public void onItemClick(ContactSelectionListItem contact) {
 
       if (!isMulti() || !selectedContacts.containsKey(contact.getContactId())) {
         selectedContacts.put(contact.getContactId(), contact.getNumber());
@@ -185,4 +194,181 @@ public class ContactSelectionListFragment extends    Fragment
     void onContactSelected(String number);
     void onContactDeselected(String number);
   }
+
+  /**
+   * A sticky header decoration for android's RecyclerView.
+   */
+  public static class StickyHeaderDecoration extends RecyclerView.ItemDecoration {
+
+    private Map<Long, RecyclerView.ViewHolder> mHeaderCache;
+
+    private StickyHeaderAdapter mAdapter;
+
+    private boolean mRenderInline;
+
+    /**
+     * @param adapter the sticky header adapter to use
+     */
+    public StickyHeaderDecoration(StickyHeaderAdapter adapter, boolean renderInline) {
+      mAdapter = adapter;
+      mHeaderCache = new HashMap<>();
+      mRenderInline = renderInline;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public void getItemOffsets(Rect outRect, View view, RecyclerView parent,
+                               RecyclerView.State state)
+    {
+      int position = parent.getChildAdapterPosition(view);
+
+      int headerHeight = 0;
+      if (position != RecyclerView.NO_POSITION && hasHeader(position)) {
+        View header = getHeader(parent, position).itemView;
+        headerHeight = getHeaderHeightForLayout(header);
+      }
+
+      outRect.set(0, headerHeight, 0, 0);
+    }
+
+    private boolean hasHeader(int position) {
+      if (position == 0) {
+        return true;
+      }
+
+      int previous = position - 1;
+      return mAdapter.getHeaderId(position) != mAdapter.getHeaderId(previous);
+    }
+
+    private RecyclerView.ViewHolder getHeader(RecyclerView parent, int position) {
+      final long key = mAdapter.getHeaderId(position);
+
+      if (mHeaderCache.containsKey(key)) {
+        return mHeaderCache.get(key);
+      } else {
+        final RecyclerView.ViewHolder holder = mAdapter.onCreateHeaderViewHolder(parent);
+        final View header = holder.itemView;
+
+        //noinspection unchecked
+        mAdapter.onBindHeaderViewHolder(holder, position);
+
+        int widthSpec = View.MeasureSpec.makeMeasureSpec(parent.getWidth(), View.MeasureSpec.EXACTLY);
+        int heightSpec = View.MeasureSpec.makeMeasureSpec(parent.getHeight(), View.MeasureSpec.UNSPECIFIED);
+
+        int childWidth = ViewGroup.getChildMeasureSpec(widthSpec,
+                                                       parent.getPaddingLeft() + parent.getPaddingRight(), header.getLayoutParams().width);
+        int childHeight = ViewGroup.getChildMeasureSpec(heightSpec,
+                                                        parent.getPaddingTop() + parent.getPaddingBottom(), header.getLayoutParams().height);
+
+        header.measure(childWidth, childHeight);
+        header.layout(0, 0, header.getMeasuredWidth(), header.getMeasuredHeight());
+
+        mHeaderCache.put(key, holder);
+
+        return holder;
+      }
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public void onDrawOver(Canvas c, RecyclerView parent, RecyclerView.State state) {
+      final int count = parent.getChildCount();
+
+      for (int layoutPos = 0; layoutPos < count; layoutPos++) {
+        final View child = parent.getChildAt(layoutPos);
+
+        final int adapterPos = parent.getChildAdapterPosition(child);
+
+        if (adapterPos != RecyclerView.NO_POSITION && (layoutPos == 0 || hasHeader(adapterPos))) {
+          View header = getHeader(parent, adapterPos).itemView;
+          c.save();
+          final int left = child.getLeft();
+          final int top = getHeaderTop(parent, child, header, adapterPos, layoutPos);
+          c.translate(left, top);
+          header.draw(c);
+          c.restore();
+        }
+      }
+    }
+
+    private int getHeaderTop(RecyclerView parent, View child, View header, int adapterPos,
+                             int layoutPos)
+    {
+      int headerHeight = getHeaderHeightForLayout(header);
+      int top = getChildY(parent, child) - headerHeight;
+      if (layoutPos == 0) {
+        final int count = parent.getChildCount();
+        final long currentId = mAdapter.getHeaderId(adapterPos);
+        // find next view with header and compute the offscreen push if needed
+        for (int i = 1; i < count; i++) {
+          int adapterPosHere = parent.getChildAdapterPosition(parent.getChildAt(i));
+          if (adapterPosHere != RecyclerView.NO_POSITION) {
+            long nextId = mAdapter.getHeaderId(adapterPosHere);
+            if (nextId != currentId) {
+              final View next = parent.getChildAt(i);
+              final int offset = getChildY(parent, next) - (headerHeight + getHeader(parent, adapterPosHere).itemView.getHeight());
+              if (offset < 0) {
+                return offset;
+              } else {
+                break;
+              }
+            }
+          }
+        }
+
+        top = Math.max(0, top);
+      }
+
+      return top;
+    }
+
+    private int getChildY(RecyclerView parent, View child) {
+      if (VERSION.SDK_INT < 11) {
+        Rect rect = new Rect();
+        parent.getChildVisibleRect(child, rect, null);
+        return rect.top;
+      } else {
+        return (int)ViewCompat.getY(child);
+      }
+    }
+
+    private int getHeaderHeightForLayout(View header) {
+      return mRenderInline ? 0 : header.getHeight();
+    }
+  }
+
+  /**
+   * The adapter to assist the {@link StickyHeaderDecoration} in creating and binding the header views.
+   *
+   * @param <T> the header view holder
+   */
+  public interface StickyHeaderAdapter<T extends RecyclerView.ViewHolder> {
+
+    /**
+     * Returns the header id for the item at the given position.
+     *
+     * @param position the item position
+     * @return the header id
+     */
+    long getHeaderId(int position);
+
+    /**
+     * Creates a new header ViewHolder.
+     *
+     * @param parent the header's view parent
+     * @return a view holder for the created view
+     */
+    T onCreateHeaderViewHolder(ViewGroup parent);
+
+    /**
+     * Updates the header view to reflect the header data for the given position
+     * @param viewHolder the header view holder
+     * @param position the header's item position
+     */
+    void onBindHeaderViewHolder(T viewHolder, int position);
+  }
 }

src/org/thoughtcrime/securesms/components/AvatarImageView.java

@@ -3,8 +3,13 @@ package org.thoughtcrime.securesms.components;
 import android.content.Context;
 import android.content.Intent;
 import android.content.res.TypedArray;
+import android.graphics.drawable.Drawable;
+import android.graphics.drawable.LayerDrawable;
+import android.os.AsyncTask;
 import android.provider.ContactsContract;
 import android.support.annotation.Nullable;
+import android.support.v4.content.ContextCompat;
+import android.support.v4.util.Pair;
 import android.util.AttributeSet;
 import android.view.View;
 import android.widget.ImageView;
@@ -16,10 +21,13 @@ import org.thoughtcrime.securesms.contacts.avatars.ContactPhotoFactory;
 import org.thoughtcrime.securesms.recipients.Recipient;
 import org.thoughtcrime.securesms.recipients.RecipientFactory;
 import org.thoughtcrime.securesms.recipients.Recipients;
+import org.thoughtcrime.securesms.util.DirectoryHelper;
+import org.thoughtcrime.securesms.util.DirectoryHelper.UserCapabilities.Capability;
 
 public class AvatarImageView extends ImageView {
 
   private boolean inverted;
+  private boolean showBadge;
 
   public AvatarImageView(Context context) {
     super(context);
@@ -33,18 +41,22 @@ public class AvatarImageView extends ImageView {
     if (attrs != null) {
       TypedArray typedArray = context.getTheme().obtainStyledAttributes(attrs, R.styleable.AvatarImageView, 0, 0);
       inverted = typedArray.getBoolean(0, false);
+      showBadge = typedArray.getBoolean(1, false);
       typedArray.recycle();
     }
   }
 
-  public void setAvatar(@Nullable Recipients recipients, boolean quickContactEnabled) {
+  public void setAvatar(final @Nullable Recipients recipients, boolean quickContactEnabled) {
     if (recipients != null) {
       MaterialColor backgroundColor = recipients.getColor();
       setImageDrawable(recipients.getContactPhoto().asDrawable(getContext(), backgroundColor.toConversationColor(getContext()), inverted));
       setAvatarClickHandler(recipients, quickContactEnabled);
+      setTag(recipients);
+      if (showBadge) new BadgeResolutionTask(getContext()).execute(recipients);
     } else {
       setImageDrawable(ContactPhotoFactory.getDefaultContactPhoto(null).asDrawable(getContext(), ContactColors.UNKNOWN_COLOR.toConversationColor(getContext()), inverted));
       setOnClickListener(null);
+      setTag(null);
     }
   }
 
@@ -74,4 +86,29 @@ public class AvatarImageView extends ImageView {
     }
   }
 
+  private class BadgeResolutionTask extends AsyncTask<Recipients,Void,Pair<Recipients, Boolean>> {
+    private final Context context;
+
+    public BadgeResolutionTask(Context context) {
+      this.context = context;
+    }
+
+    @Override
+    protected Pair<Recipients, Boolean> doInBackground(Recipients... recipients) {
+      Capability textCapability = DirectoryHelper.getUserCapabilities(context, recipients[0]).getTextCapability();
+      return new Pair<>(recipients[0], textCapability == Capability.SUPPORTED);
+    }
+
+    @Override
+    protected void onPostExecute(Pair<Recipients, Boolean> result) {
+      if (getTag() == result.first && result.second) {
+        final Drawable badged = new LayerDrawable(new Drawable[] {
+            getDrawable(),
+            ContextCompat.getDrawable(context, R.drawable.badge_drawable)
+        });
+
+        setImageDrawable(badged);
+      }
+    }
+  }
 }

src/org/thoughtcrime/securesms/components/RecyclerViewFastScroller.java

@@ -0,0 +1,206 @@
+/**
+ * Modified version of
+ * https://github.com/AndroidDeveloperLB/LollipopContactsRecyclerViewFastScroller
+ *
+ * Their license:
+ *
+ * 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.components;
+
+import android.animation.Animator;
+import android.animation.AnimatorListenerAdapter;
+import android.animation.ObjectAnimator;
+import android.annotation.TargetApi;
+import android.content.Context;
+import android.os.Build.VERSION;
+import android.support.annotation.NonNull;
+import android.support.v4.view.ViewCompat;
+import android.support.v7.widget.LinearLayoutManager;
+import android.support.v7.widget.RecyclerView;
+import android.util.AttributeSet;
+import android.util.Log;
+import android.view.MotionEvent;
+import android.view.View;
+import android.view.ViewTreeObserver;
+import android.widget.LinearLayout;
+import android.widget.TextView;
+
+import org.thoughtcrime.securesms.R;
+import org.thoughtcrime.securesms.util.Util;
+import org.thoughtcrime.securesms.util.ViewUtil;
+
+public class RecyclerViewFastScroller extends LinearLayout {
+  private static final int BUBBLE_ANIMATION_DURATION = 100;
+  private static final int TRACK_SNAP_RANGE          = 5;
+
+  private TextView       bubble;
+  private View           handle;
+  private RecyclerView   recyclerView;
+  private int            height;
+  private ObjectAnimator currentAnimator;
+
+  private final RecyclerView.OnScrollListener onScrollListener = new RecyclerView.OnScrollListener() {
+    @Override
+    public void onScrolled(final RecyclerView recyclerView, final int dx, final int dy) {
+      if (bubble == null || handle.isSelected())
+        return;
+      final int verticalScrollOffset = recyclerView.computeVerticalScrollOffset();
+      final int verticalScrollRange = recyclerView.computeVerticalScrollRange();
+      float proportion = (float)verticalScrollOffset / ((float)verticalScrollRange - height);
+      setBubbleAndHandlePosition(height * proportion);
+    }
+  };
+
+  public interface FastScrollAdapter {
+    CharSequence getBubbleText(int pos);
+  }
+
+  public RecyclerViewFastScroller(final Context context) {
+    this(context, null);
+  }
+
+  public RecyclerViewFastScroller(final Context context, final AttributeSet attrs) {
+    super(context, attrs);
+    setOrientation(HORIZONTAL);
+    setClipChildren(false);
+    inflate(context, R.layout.recycler_view_fast_scroller, this);
+    bubble = ViewUtil.findById(this, R.id.fastscroller_bubble);
+    handle = ViewUtil.findById(this, R.id.fastscroller_handle);
+  }
+
+  @Override
+  protected void onSizeChanged(int w, int h, int oldw, int oldh) {
+    super.onSizeChanged(w, h, oldw, oldh);
+    height = h;
+  }
+
+  @Override
+  @TargetApi(11)
+  public boolean onTouchEvent(@NonNull MotionEvent event) {
+    final int action = event.getAction();
+    switch (action) {
+    case MotionEvent.ACTION_DOWN:
+      if (event.getX() < ViewUtil.getX(handle) - handle.getPaddingLeft() ||
+          event.getY() < ViewUtil.getY(handle) - handle.getPaddingTop() ||
+          event.getY() > ViewUtil.getY(handle) + handle.getHeight() + handle.getPaddingBottom())
+      {
+        return false;
+      }
+      if (currentAnimator != null) {
+        currentAnimator.cancel();
+      }
+      if (bubble.getVisibility() != VISIBLE) {
+        showBubble();
+      }
+      handle.setSelected(true);
+    case MotionEvent.ACTION_MOVE:
+      final float y = event.getY();
+      setBubbleAndHandlePosition(y);
+      setRecyclerViewPosition(y);
+      return true;
+    case MotionEvent.ACTION_UP:
+    case MotionEvent.ACTION_CANCEL:
+      handle.setSelected(false);
+      hideBubble();
+      return true;
+    }
+    return super.onTouchEvent(event);
+  }
+
+  public void setRecyclerView(final RecyclerView recyclerView) {
+    this.recyclerView = recyclerView;
+    recyclerView.addOnScrollListener(onScrollListener);
+    recyclerView.getViewTreeObserver().addOnPreDrawListener(new ViewTreeObserver.OnPreDrawListener() {
+      @Override
+      public boolean onPreDraw() {
+        recyclerView.getViewTreeObserver().removeOnPreDrawListener(this);
+        if (bubble == null || handle.isSelected())
+          return true;
+        final int verticalScrollOffset = recyclerView.computeVerticalScrollOffset();
+        final int verticalScrollRange = recyclerView.computeVerticalScrollRange();
+        float proportion = (float)verticalScrollOffset / ((float)verticalScrollRange - height);
+        setBubbleAndHandlePosition(height * proportion);
+        return true;
+      }
+    });
+  }
+
+  @Override
+  protected void onDetachedFromWindow() {
+    super.onDetachedFromWindow();
+    if (recyclerView != null)
+      recyclerView.removeOnScrollListener(onScrollListener);
+  }
+
+  private void setRecyclerViewPosition(float y) {
+    if (recyclerView != null) {
+      final int itemCount = recyclerView.getAdapter().getItemCount();
+      float proportion;
+      if (ViewUtil.getY(handle) == 0)
+        proportion = 0f;
+      else if (ViewUtil.getY(handle) + handle.getHeight() >= height - TRACK_SNAP_RANGE)
+        proportion = 1f;
+      else
+        proportion = y / (float) height;
+      final int targetPos = Util.clamp((int)(proportion * (float)itemCount), 0, itemCount - 1);
+      ((LinearLayoutManager) recyclerView.getLayoutManager()).scrollToPositionWithOffset(targetPos, 0);
+      final CharSequence bubbleText = ((FastScrollAdapter) recyclerView.getAdapter()).getBubbleText(targetPos);
+      if (bubble != null)
+        bubble.setText(bubbleText);
+    }
+  }
+
+  private void setBubbleAndHandlePosition(float y) {
+    final int handleHeight = handle.getHeight();
+    final int bubbleHeight = bubble.getHeight();
+    ViewUtil.setY(handle, Util.clamp((int)(y - handleHeight / 2), 0, height - handleHeight));
+    ViewUtil.setY(bubble, Util.clamp((int)(y - bubbleHeight), 0, height - bubbleHeight - handleHeight / 2));
+  }
+
+  @TargetApi(11)
+  private void showBubble() {
+    bubble.setVisibility(VISIBLE);
+    if (VERSION.SDK_INT >= 11) {
+      if (currentAnimator != null) currentAnimator.cancel();
+      currentAnimator = ObjectAnimator.ofFloat(bubble, "alpha", 0f, 1f).setDuration(BUBBLE_ANIMATION_DURATION);
+      currentAnimator.start();
+    }
+  }
+
+  @TargetApi(11)
+  private void hideBubble() {
+    if (VERSION.SDK_INT >= 11) {
+      if (currentAnimator != null) currentAnimator.cancel();
+      currentAnimator = ObjectAnimator.ofFloat(bubble, "alpha", 1f, 0f).setDuration(BUBBLE_ANIMATION_DURATION);
+      currentAnimator.addListener(new AnimatorListenerAdapter() {
+        @Override
+        public void onAnimationEnd(Animator animation) {
+          super.onAnimationEnd(animation);
+          bubble.setVisibility(INVISIBLE);
+          currentAnimator = null;
+        }
+
+        @Override
+        public void onAnimationCancel(Animator animation) {
+          super.onAnimationCancel(animation);
+          bubble.setVisibility(INVISIBLE);
+          currentAnimator = null;
+        }
+      });
+      currentAnimator.start();
+    } else {
+      bubble.setVisibility(INVISIBLE);
+    }
+  }
+}

src/org/thoughtcrime/securesms/contacts/ContactSelectionListAdapter.java

@@ -20,101 +20,174 @@ import android.content.Context;
 import android.content.res.TypedArray;
 import android.database.Cursor;
 import android.provider.ContactsContract;
-import android.support.v4.widget.CursorAdapter;
-import android.util.Log;
+import android.support.annotation.DrawableRes;
+import android.support.annotation.NonNull;
+import android.support.annotation.Nullable;
+import android.support.v7.widget.RecyclerView;
+import android.text.SpannableString;
+import android.text.Spanned;
+import android.text.style.ImageSpan;
 import android.view.LayoutInflater;
 import android.view.View;
+import android.view.View.OnClickListener;
 import android.view.ViewGroup;
 import android.widget.TextView;
 
 import org.thoughtcrime.securesms.R;
+import org.thoughtcrime.securesms.components.RecyclerViewFastScroller.FastScrollAdapter;
+import org.thoughtcrime.securesms.ContactSelectionListFragment.StickyHeaderAdapter;
+import org.thoughtcrime.securesms.contacts.ContactSelectionListAdapter.HeaderViewHolder;
+import org.thoughtcrime.securesms.contacts.ContactSelectionListAdapter.ViewHolder;
+import org.thoughtcrime.securesms.database.CursorRecyclerViewAdapter;
 
 import java.util.HashMap;
 import java.util.Map;
 
-import se.emilsjolander.stickylistheaders.StickyListHeadersAdapter;
-
 /**
  * List adapter to display all contacts and their related information
  *
  * @author Jake McGinty
  */
-public class ContactSelectionListAdapter extends    CursorAdapter
-                                         implements StickyListHeadersAdapter
+public class ContactSelectionListAdapter extends CursorRecyclerViewAdapter<ViewHolder>
+                                         implements FastScrollAdapter,
+                                                    StickyHeaderAdapter<HeaderViewHolder>
 {
   private final static String TAG = ContactSelectionListAdapter.class.getSimpleName();
 
   private final static int STYLE_ATTRIBUTES[] = new int[]{R.attr.contact_selection_push_user,
                                                           R.attr.contact_selection_lay_user};
 
-  private final boolean        multiSelect;
-  private final LayoutInflater li;
-  private final TypedArray     drawables;
+  private final boolean           multiSelect;
+  private final LayoutInflater    li;
+  private final TypedArray        drawables;
+  private final ItemClickListener clickListener;
 
   private final HashMap<Long, String> selectedContacts = new HashMap<>();
 
-  public ContactSelectionListAdapter(Context context, Cursor cursor, boolean multiSelect) {
-    super(context, cursor, 0);
-    this.li          = LayoutInflater.from(context);
-    this.drawables   = context.obtainStyledAttributes(STYLE_ATTRIBUTES);
-    this.multiSelect = multiSelect;
+  public static class ViewHolder extends RecyclerView.ViewHolder {
+    public ViewHolder(@NonNull  final View              itemView,
+                      @Nullable final ItemClickListener clickListener)
+    {
+      super(itemView);
+      itemView.setOnClickListener(new OnClickListener() {
+        @Override
+        public void onClick(View v) {
+          if (clickListener != null) clickListener.onItemClick(getView());
+        }
+      });
+    }
+
+    public ContactSelectionListItem getView() {
+      return (ContactSelectionListItem) itemView;
+    }
+  }
+
+  public static class HeaderViewHolder extends RecyclerView.ViewHolder {
+    public HeaderViewHolder(View itemView) {
+      super(itemView);
+    }
+  }
+
+  public ContactSelectionListAdapter(@NonNull  Context context,
+                                     @Nullable Cursor cursor,
+                                     @Nullable ItemClickListener clickListener,
+                                     boolean multiSelect)
+  {
+    super(context, cursor);
+    this.li           = LayoutInflater.from(context);
+    this.drawables    = context.obtainStyledAttributes(STYLE_ATTRIBUTES);
+    this.multiSelect  = multiSelect;
+    this.clickListener = clickListener;
   }
 
   @Override
-  public View newView(Context context, Cursor cursor, ViewGroup parent) {
-    return li.inflate(R.layout.contact_selection_list_item, parent, false);
+  public long getHeaderId(int i) {
+    return getHeaderString(i).hashCode();
   }
 
   @Override
-  public void bindView(View view, Context context, Cursor cursor) {
+  public ViewHolder onCreateItemViewHolder(ViewGroup parent, int viewType) {
+    return new ViewHolder(li.inflate(R.layout.contact_selection_list_item, parent, false), clickListener);
+  }
+
+  @Override
+  public void onBindItemViewHolder(ViewHolder viewHolder, @NonNull Cursor cursor) {
     long   id          = cursor.getLong(cursor.getColumnIndexOrThrow(ContactsDatabase.ID_COLUMN));
     int    contactType = cursor.getInt(cursor.getColumnIndexOrThrow(ContactsDatabase.CONTACT_TYPE_COLUMN));
     String name        = cursor.getString(cursor.getColumnIndexOrThrow(ContactsDatabase.NAME_COLUMN));
     String number      = cursor.getString(cursor.getColumnIndexOrThrow(ContactsDatabase.NUMBER_COLUMN));
     int    numberType  = cursor.getInt(cursor.getColumnIndexOrThrow(ContactsDatabase.NUMBER_TYPE_COLUMN));
     String label       = cursor.getString(cursor.getColumnIndexOrThrow(ContactsDatabase.LABEL_COLUMN));
-    String labelText   = ContactsContract.CommonDataKinds.Phone.getTypeLabel(context.getResources(),
+    String labelText   = ContactsContract.CommonDataKinds.Phone.getTypeLabel(getContext().getResources(),
                                                                              numberType, label).toString();
 
     int color = (contactType == ContactsDatabase.PUSH_TYPE) ? drawables.getColor(0, 0xa0000000) :
-                                                              drawables.getColor(1, 0xff000000);
+                drawables.getColor(1, 0xff000000);
 
-
-    ((ContactSelectionListItem)view).unbind();
-    ((ContactSelectionListItem)view).set(id, contactType, name, number, labelText, color, multiSelect);
-    ((ContactSelectionListItem)view).setChecked(selectedContacts.containsKey(id));
+    viewHolder.getView().unbind();
+    viewHolder.getView().set(id, contactType, name, number, labelText, color, multiSelect);
+    viewHolder.getView().setChecked(selectedContacts.containsKey(id));
   }
 
   @Override
-  public View getHeaderView(int i, View convertView, ViewGroup viewGroup) {
-    Cursor cursor = getCursor();
-
-    final TextView text;
-    if (convertView == null) {
-      text = (TextView)li.inflate(R.layout.contact_selection_list_header, viewGroup, false);
-    } else {
-      text = (TextView)convertView;
-    }
-
-    cursor.moveToPosition(i);
-
-    int contactType = cursor.getInt(cursor.getColumnIndexOrThrow(ContactsDatabase.CONTACT_TYPE_COLUMN));
-
-    if (contactType == ContactsDatabase.PUSH_TYPE) text.setText(R.string.contact_selection_list__header_signal_users);
-    else                                           text.setText(R.string.contact_selection_list__header_other);
-
-    return text;
+  public HeaderViewHolder onCreateHeaderViewHolder(ViewGroup parent) {
+    return new HeaderViewHolder(LayoutInflater.from(getContext()).inflate(R.layout.contact_selection_recyclerview_header, parent, false));
   }
 
   @Override
-  public long getHeaderId(int i) {
-    Cursor cursor = getCursor();
-    cursor.moveToPosition(i);
+  public void onBindHeaderViewHolder(HeaderViewHolder viewHolder, int position) {
+    ((TextView)viewHolder.itemView).setText(getSpannedHeaderString(position, R.drawable.ic_signal_grey_24dp));
+  }
 
-    return cursor.getInt(cursor.getColumnIndexOrThrow(ContactsDatabase.CONTACT_TYPE_COLUMN));
+  @Override
+  public CharSequence getBubbleText(int position) {
+    return getSpannedHeaderString(position, R.drawable.ic_signal_white_48dp);
   }
 
   public Map<Long, String> getSelectedContacts() {
     return selectedContacts;
   }
+
+  private CharSequence getSpannedHeaderString(int position, @DrawableRes int drawable) {
+    Cursor cursor = getCursorAtPositionOrThrow(position);
+
+    if (cursor.getInt(cursor.getColumnIndexOrThrow(ContactsDatabase.CONTACT_TYPE_COLUMN)) == ContactsDatabase.PUSH_TYPE) {
+      SpannableString spannable = new SpannableString(" ");
+      spannable.setSpan(new ImageSpan(getContext(), drawable, ImageSpan.ALIGN_BOTTOM), 0, spannable.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
+      return spannable;
+    } else {
+      return getHeaderString(position);
+    }
+  }
+
+  private String getHeaderString(int position) {
+    Cursor cursor = getCursorAtPositionOrThrow(position);
+
+    if (cursor.getInt(cursor.getColumnIndexOrThrow(ContactsDatabase.CONTACT_TYPE_COLUMN)) == ContactsDatabase.PUSH_TYPE) {
+      return getContext().getString(R.string.app_name);
+    } else {
+      String letter = cursor.getString(cursor.getColumnIndexOrThrow(ContactsDatabase.NAME_COLUMN))
+                            .trim()
+                            .substring(0,1)
+                            .toUpperCase();
+      if (Character.isLetterOrDigit(letter.codePointAt(0))) {
+        return letter;
+      } else {
+        return "#";
+      }
+    }
+  }
+
+  private Cursor getCursorAtPositionOrThrow(int position) {
+    Cursor cursor = getCursor();
+    if (cursor == null) {
+      throw new IllegalStateException("Cursor should not be null here.");
+    }
+    if (!cursor.moveToPosition(position));
+    return cursor;
+  }
+
+  public interface ItemClickListener {
+    void onItemClick(ContactSelectionListItem item);
+  }
 }

src/org/thoughtcrime/securesms/contacts/ContactSelectionListItem.java

@@ -5,7 +5,7 @@ import android.text.TextUtils;
 import android.util.AttributeSet;
 import android.view.View;
 import android.widget.CheckBox;
-import android.widget.RelativeLayout;
+import android.widget.LinearLayout;
 import android.widget.TextView;
 
 import org.thoughtcrime.securesms.R;
@@ -14,7 +14,7 @@ import org.thoughtcrime.securesms.recipients.Recipient;
 import org.thoughtcrime.securesms.recipients.RecipientFactory;
 import org.thoughtcrime.securesms.recipients.Recipients;
 
-public class ContactSelectionListItem extends RelativeLayout implements Recipients.RecipientsModifiedListener {
+public class ContactSelectionListItem extends LinearLayout implements Recipients.RecipientsModifiedListener {
 
   private AvatarImageView contactPhotoImage;
   private TextView        numberView;
@@ -34,10 +34,6 @@ public class ContactSelectionListItem extends RelativeLayout implements Recipien
     super(context, attrs);
   }
 
-  public ContactSelectionListItem(Context context, AttributeSet attrs, int defStyleAttr) {
-    super(context, attrs, defStyleAttr);
-  }
-
   @Override
   protected void onFinishInflate() {
     super.onFinishInflate();

src/org/thoughtcrime/securesms/util/ViewUtil.java

@@ -24,6 +24,7 @@ import android.support.annotation.IdRes;
 import android.support.annotation.LayoutRes;
 import android.support.annotation.NonNull;
 import android.support.annotation.Nullable;
+import android.support.v4.view.ViewCompat;
 import android.support.v4.view.animation.FastOutSlowInInterpolator;
 import android.text.TextUtils;
 import android.text.TextUtils.TruncateAt;
@@ -33,6 +34,7 @@ import android.view.ViewGroup;
 import android.view.ViewStub;
 import android.view.animation.AlphaAnimation;
 import android.view.animation.Animation;
+import android.widget.LinearLayout.LayoutParams;
 import android.widget.TextView;
 
 public class ViewUtil {
@@ -45,6 +47,42 @@ public class ViewUtil {
     }
   }
 
+  public static void setY(final @NonNull View v, final int y) {
+    if (VERSION.SDK_INT >= 11) {
+      ViewCompat.setY(v, y);
+    } else {
+      ViewGroup.MarginLayoutParams params = (ViewGroup.MarginLayoutParams)v.getLayoutParams();
+      params.topMargin = y;
+      v.setLayoutParams(params);
+    }
+  }
+
+  public static float getY(final @NonNull View v) {
+    if (VERSION.SDK_INT >= 11) {
+      return ViewCompat.getY(v);
+    } else {
+      return ((ViewGroup.MarginLayoutParams)v.getLayoutParams()).topMargin;
+    }
+  }
+
+  public static void setX(final @NonNull View v, final int x) {
+    if (VERSION.SDK_INT >= 11) {
+      ViewCompat.setX(v, x);
+    } else {
+      ViewGroup.MarginLayoutParams params = (ViewGroup.MarginLayoutParams)v.getLayoutParams();
+      params.leftMargin = x;
+      v.setLayoutParams(params);
+    }
+  }
+
+  public static float getX(final @NonNull View v) {
+    if (VERSION.SDK_INT >= 11) {
+      return ViewCompat.getX(v);
+    } else {
+      return ((LayoutParams)v.getLayoutParams()).leftMargin;
+    }
+  }
+
   public static void swapChildInPlace(ViewGroup parent, View toRemove, View toAdd, int defaultIndex) {
     int childIndex = parent.indexOfChild(toRemove);
     if (childIndex > -1) parent.removeView(toRemove);