ChatAdapter.java

package org.jorge.cmp.ui.adapter;

import android.content.Context;
import android.support.annotation.Nullable;
import android.support.v7.widget.DefaultItemAnimator;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.text.TextUtils;
import android.view.KeyEvent;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.inputmethod.EditorInfo;
import android.view.inputmethod.InputMethodManager;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.TextView;

import com.github.theholywaffle.lolchatapi.wrapper.Friend;

import org.jorge.cmp.R;
import org.jorge.cmp.anim.ExpandableViewHoldersUtil;
import org.jorge.cmp.chat.ChatHistoryManager;
import org.jorge.cmp.chat.ChatNotificationManager;
import org.jorge.cmp.chat.FriendManager;
import org.jorge.cmp.datamodel.ChatMessageWrapper;
import org.jorge.cmp.io.prefs.PreferenceAssistant;
import org.jorge.cmp.util.PicassoUtils;

import java.util.Iterator;
import java.util.LinkedHashSet;
import java.util.Locale;
import java.util.Set;

public class ChatAdapter extends RecyclerView.Adapter<ChatAdapter.ViewHolder> {

    private final View mEmptyView;
    private final Set<Friend> mData = new LinkedHashSet<>();
    private final Context mContext;
    private final String mTag;
    private final String BASE_PROFILE_ICON_URL;
    private final String DEFAULT_PROFILE_IMG_URL;
    private final ExpandableViewHoldersUtil.KeepOneH<ViewHolder> keepOne = new
            ExpandableViewHoldersUtil
                    .KeepOneH<>();

    public ChatAdapter(Context context, View emptyView, String tag) {
        mEmptyView = emptyView;
        mContext = context;
        mTag = tag;
        BASE_PROFILE_ICON_URL = mContext.getString(R.string
                .profile_icon_url_pattern);
        DEFAULT_PROFILE_IMG_URL =
                String.format(Locale.ENGLISH,
                        BASE_PROFILE_ICON_URL, PreferenceAssistant.readSharedString(mContext,
                                PreferenceAssistant.PREF_LAST_PROFILE_ICON_VERSION, "null"),
                        "0");
    }

    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        final View v = LayoutInflater.from(parent.getContext()).inflate(R.layout
                .list_item_chat_friend, parent, Boolean.FALSE);
        return new ViewHolder(mContext, v);
    }

    @Override
    public void onBindViewHolder(final ViewHolder viewHolder, final int i) {
        keepOne.bind(viewHolder, i);

        viewHolder.profileImageView.setImageDrawable(null);
        Friend item = getItem(i);
        if (item != null) {
            if (viewHolder.profileImageView.getDrawable() == null) {
                final String imgUrl = String.format(Locale.ENGLISH,
                        BASE_PROFILE_ICON_URL, PreferenceAssistant.readSharedString(mContext,
                                PreferenceAssistant.PREF_LAST_PROFILE_ICON_VERSION, "null"),
                        item.getStatus().getProfileIconId());
                PicassoUtils.loadInto(mContext, imgUrl, DEFAULT_PROFILE_IMG_URL,
                        viewHolder.profileImageView, mTag);
                viewHolder.profileImageView.setContentDescription(item.getName());
            }

            viewHolder.userNameView.setText(item.getName());

            viewHolder.statusView.setText(item.getStatus().getStatusMessage());
            viewHolder.setupChatRoomAdapter();
        }
    }

    @Nullable
    private synchronized Friend getItem(Integer i) {
        for (Iterator<Friend> it = mData.iterator(); it.hasNext(); ) {
            if (i == 0) {
                return it.next();
            }
            i--;
            it.next();
        }
        return null;
    }

    public void notifyFriendSetChanged() {
        //Workaround for RecyclerView bug (https://code.google.com/p/android/issues/detail?id=77232)
        mEmptyView.postDelayed(new Runnable() {
            @Override
            public void run() {
                mData.clear();
                mData.addAll(FriendManager.getInstance().getOnlineFriends());
                ChatAdapter.super.notifyDataSetChanged();
                updateEmptyViewVisibility();
            }
        }, 200);
    }

    private void updateEmptyViewVisibility() {
        if (mData.isEmpty()) {
            mEmptyView.setVisibility(View.VISIBLE);
        } else
            mEmptyView.setVisibility(View.GONE);
    }

    @Override
    public int getItemCount() {
        return mData.size();
    }


    public class ViewHolder extends RecyclerView.ViewHolder implements View
            .OnClickListener, ExpandableViewHoldersUtil.Expandable {

        private final TextView userNameView, statusView;
        private final ImageView profileImageView;
        private final ViewGroup mChatArea;
        private final EditText mInputArea;
        private final Context mContext;
        private final RecyclerView mMessageRecyclerView;
        private ChatRoomAdapter mChatRoomAdapter;

        public ViewHolder(Context context, View itemView) {
            super(itemView);
            itemView.setOnClickListener(this);
            userNameView = (TextView) itemView.findViewById(R.id.user_name);
            statusView = (TextView) itemView.findViewById(R.id.user_status);
            profileImageView = (ImageView) itemView.findViewById(R.id.user_image);
            mChatArea = (ViewGroup) itemView.findViewById(R.id.chat_expand_area);
            mInputArea = (EditText) itemView.findViewById(android.R.id.inputArea);
            mContext = context;
            mMessageRecyclerView = (RecyclerView) mChatArea.findViewById(R.id
                    .chat_room_message_recycler_view);
            mMessageRecyclerView.setOverScrollMode(View.OVER_SCROLL_NEVER);
            final LinearLayoutManager layoutManager = new LinearLayoutManager(mContext);
            layoutManager.setStackFromEnd(Boolean.TRUE);
            mMessageRecyclerView.setLayoutManager(layoutManager);
            mMessageRecyclerView.setHasFixedSize(Boolean.FALSE);
            mMessageRecyclerView.setItemAnimator(new DefaultItemAnimator());
            mInputArea.setOnEditorActionListener(new TextView.OnEditorActionListener() {
                @Override
                public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {
                    if (actionId == EditorInfo.IME_ACTION_SEND || (event != null && event
                            .isShiftPressed() && (event
                            .getAction() == KeyEvent
                            .ACTION_DOWN &&
                            event.getKeyCode() == KeyEvent.KEYCODE_ENTER))) {
                        final String messageText, friendName;
                        if (!TextUtils.isEmpty(messageText = mInputArea.getText().toString())) {
                            FriendManager.getInstance().requestSendMessage(messageText,
                                    friendName = userNameView.getText().toString());
                            ChatHistoryManager.addMessageToFriendChat(new ChatMessageWrapper
                                    (messageText,
                                            System.currentTimeMillis()), FriendManager.getInstance()
                                    .findFriendByName(friendName));
                            mInputArea.setText("");
                            return Boolean.TRUE;
                        }
                    }
                    return Boolean.FALSE;
                }
            });
        }

        private void setupChatRoomAdapter() { //Must be called here because before it is unknown
            // who the friend is
            final String friendName = userNameView.getText().toString();
            mChatRoomAdapter = ChatHistoryManager.getChatRoomByFriend(FriendManager.getInstance()
                    .findFriendByName(friendName), mMessageRecyclerView);
            ChatNotificationManager.dismissNotificationsForFriend(mContext, friendName);
            mMessageRecyclerView.setAdapter(mChatRoomAdapter);
        }

        @Override
        public void onClick(final View view) {
            final InputMethodManager imm = (InputMethodManager) mContext.getSystemService(
                    Context.INPUT_METHOD_SERVICE);
            imm.hideSoftInputFromWindow(mInputArea.getWindowToken(), 0);
            keepOne.toggle(this);
            notifyItemChanged(getPosition());
            mInputArea.clearFocus();
        }

        @Override
        public View getExpandView() {
            return mChatArea;
        }
    }
}