Android Open Source - MentorMe Chat Adapter

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License

The source code is released under:

MIT License

Java Source Code

package com.codepath.wwcmentorme.adapters;
/*w w w . jav  a 2 s.  c o m*/
import java.util.ArrayList;
import java.util.HashSet;
import java.util.LinkedHashMap;
import java.util.List;

import android.animation.Animator;
import android.animation.Animator.AnimatorListener;
import android.animation.AnimatorSet;
import android.animation.ObjectAnimator;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.animation.AnimationSet;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.TextView;

import com.codepath.wwcmentorme.R;
import com.codepath.wwcmentorme.helpers.Utils;
import com.codepath.wwcmentorme.helpers.ViewHolder;
import com.codepath.wwcmentorme.models.Message;
import com.codepath.wwcmentorme.models.User;
import com.nostra13.universalimageloader.core.ImageLoader;

public class ChatAdapter extends ArrayAdapter<ChatAdapter.MessageGroup> {
  public static class MessageGroup {
    private final LinkedHashMap<String, Message> messages = new LinkedHashMap<String, Message>();
    private final Message head;
    private Message tail;
    private StringBuilder text = new StringBuilder();
    
    public static List<MessageGroup> processMessages(final List<Message> messages, final MessageGroup lastGroup) {
      final ArrayList<MessageGroup> newMessageGroups = new ArrayList<MessageGroup>();
      MessageGroup messageGroup = lastGroup;
      Message lastMessage = messageGroup != null ? messageGroup.last() : null;
      for (final Message message : messages) {
        if (shouldGroup(messageGroup, lastMessage, message)) {
          messageGroup.addMessage(message);
        } else {
          messageGroup = new MessageGroup(message);
          newMessageGroups.add(messageGroup);
        }
        lastMessage = message;
      }
      return newMessageGroups;
    }
    
    private static boolean shouldGroup(final MessageGroup group, final Message tail, final Message newMessage) {
      if (group == null || tail == null || newMessage == null) return false;
      if (group.contains(newMessage)) return false;
      if (group.size() > 10) return false;
      long diff = (long)Math.abs(tail.getCreatedAt().getTime() - newMessage.getCreatedAt().getTime()); 
      if (diff > 1L * 60L * 1000L) return false;
      return tail.getUserId() == newMessage.getUserId();
    }
    
    private MessageGroup(final Message head) {
      this.head = head;
      addMessage(head);
    }
    
    private boolean contains(final Message message) {
      return messages.containsKey(message.getObjectId());
    }
    
    private void addMessage(final Message message) {
      if (messages.containsKey(message.getObjectId())) return;
      tail = message;
      messages.put(message.getObjectId(), message);
      if (head != tail) {
        text.append("\n");
      }
      text.append(message.getText());
    }
    
    public Message first() {
      return head;
    }
    
    public Message last() {
      return tail;
    }
    
    public String getText() {
      return text.toString();
    }
    
    public int size() {
      return messages.size();
    }
  }
  
  private HashSet<MessageGroup> mProcessedMessageGroups = new HashSet<MessageGroup>();
  
  public ChatAdapter(Context context) {
    super(context, 0);
  }
  
  @Override
  public View getView(final int position, final View convertView, final ViewGroup parent) {
    return getView(getItem(position), convertView, parent);
  }
  
  @Override
  public int getViewTypeCount() {
    return 2;
  }
  
  @Override
  public int getItemViewType(int position) {
    return getItem(position).last().getUserId() == User.meId() ? 0 : 1;
  }
  
  private View getView(final MessageGroup message, final View convertView, final ViewGroup parent) {
    View view = convertView;
    if (view == null) {
      LayoutInflater inflator = (LayoutInflater) getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
      view = inflator.inflate(message.last().getUserId() == User.meId() ? R.layout.chat_list_item_self : R.layout.chat_list_item, null);
      final ViewHolder.ChatItem holder = new ViewHolder.ChatItem();
      holder.ivUserProfile = (ImageView)view.findViewById(R.id.ivUserProfile);
      holder.tvMessage = (TextView)view.findViewById(R.id.tvMessage);
      holder.tvTime = (TextView)view.findViewById(R.id.tvTime);
      view.setTag(holder);
    }
    populateView(parent, view, message);
    return view;
  }
  
  private void populateView(final ViewGroup parent, final View view, final MessageGroup message) {
    final ViewHolder.ChatItem holder = (ViewHolder.ChatItem) view.getTag();
    final ImageLoader imageLoader = ImageLoader.getInstance();
    final Message last = message.last();
    final User user = User.getUser(last.getUserId());
    imageLoader.cancelDisplayTask(holder.ivUserProfile);
    imageLoader.displayImage(user.getProfileImageUrl(200), holder.ivUserProfile);
    holder.tvMessage.setText(message.getText());
    holder.tvTime.setText(Utils.getShortRelativeTime(last.getCreatedAt()));
    if (!mProcessedMessageGroups.contains(message) && parent.getHeight() != 0) {
      
      final ObjectAnimator animator = ObjectAnimator.ofFloat(view, "alpha", 0, 1);
      animator.addListener(new AnimatorListener() {
        @Override
        public void onAnimationStart(Animator animation) {}
        @Override
        public void onAnimationCancel(Animator animation) {}
        @Override
        public void onAnimationRepeat(Animator animation) {}
        
        @Override
        public void onAnimationEnd(Animator animation) {
          mProcessedMessageGroups.add(message);
        }
      });
      float amountX = parent.getWidth() * 0.2f;
      final ObjectAnimator animatorMessage = ObjectAnimator.ofFloat(holder.tvMessage, "translationX", last.getUserId() == User.meId() ? amountX : -amountX, 0);
      final ObjectAnimator animatorProfile = ObjectAnimator.ofFloat(holder.ivUserProfile, "translationX", last.getUserId() == User.meId() ? amountX : -amountX, 0);
      final ObjectAnimator animatorTime = ObjectAnimator.ofFloat(holder.tvTime, "alpha", 0, 1);
      final AnimatorSet set = new AnimatorSet();
      set.playTogether(animator, animatorMessage, animatorProfile, animatorTime);
      set.setDuration(500);
      set.start();
    }
  }
  
  public List<MessageGroup> processMessages(final List<Message> messages) {
    final int count = getCount();
    final ArrayList<Message> dedupedMessages = new ArrayList<Message>();
    for (final Message message : messages) {
      boolean found = false;
      for (int i = 0; i < count; ++i) {
        final MessageGroup group = getItem(i);
        if (group.contains(message)) {
          found = true;
          break;
        }
      }
      if (!found) {
        dedupedMessages.add(message);
      }
    }
    ChatAdapter.MessageGroup lastMessageGroup = count > 0 ? getItem(count - 1) : null;
    return MessageGroup.processMessages(dedupedMessages, lastMessageGroup);
  }
}

Java Source Code List

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