Android Open Source - MentorMe Chat Activity

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License

The source code is released under:

MIT License

Java Source Code

package com.codepath.wwcmentorme.activities;
//w  ww.  j  a v  a 2s .  co m
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import android.os.Bundle;
import android.view.KeyEvent;
import android.view.View;
import android.view.inputmethod.EditorInfo;
import android.widget.AbsListView;
import android.widget.AbsListView.OnScrollListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.TextView.OnEditorActionListener;

import com.codepath.wwcmentorme.R;
import com.codepath.wwcmentorme.adapters.ChatAdapter;
import com.codepath.wwcmentorme.data.DataService;
import com.codepath.wwcmentorme.helpers.Async;
import com.codepath.wwcmentorme.helpers.NotificationCenter;
import com.codepath.wwcmentorme.helpers.UIUtils;
import com.codepath.wwcmentorme.models.Message;
import com.codepath.wwcmentorme.models.User;
import com.parse.ParseException;
import com.parse.SaveCallback;

public class ChatActivity extends AppActivity implements NotificationCenter.Listener<Object> {
  private long mUserId;
  private String mNotificationKey;
  private Runnable mPoll;
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setAutohideActionBar(false);
    setContentView(R.layout.activity_chat);
    final long userId = getIntent().getLongExtra("userId", 0);
    DataService.getOrFetchUser(userId, new Async.Block<User>() {
      @Override
      public void call(final User user) {
        setTitle(user.getDisplayName());
      }
    });
    populateListView(userId);
    final String chatKey = Message.getGroup(User.meId(), userId);
    mNotificationKey = NotificationCenter.keyForPubnubChannel(chatKey);
    NotificationCenter.registerListener(this, mNotificationKey);
  }
  
  private void getMessages(final long userId, int count, final ChatAdapter adapter, final ListView lv) {
    final boolean isInitial = adapter.getCount() == 0;
    if (isInitial) {
      getProgressBar().setVisibility(View.VISIBLE);
    }
    DataService.getMessages(User.meId(), userId, 100, null, null, new Async.Block<List<Message>>() {
      @Override
      public void call(final List<Message> result) {
        if (isInitial) {
          getProgressBar().setVisibility(View.INVISIBLE);
        }
        if (result != null) {
          addMessages(result, adapter);
          if (isInitial) {
            lv.setSelection(adapter.getCount() - 1);
          }
        }
      }
    });
  }
  
  private void populateListView(final long userId) {
    final ListView lv = (ListView) findViewById(R.id.lvChat);
    final ChatAdapter adapter = new ChatAdapter(getActivity());
    lv.setAdapter(adapter);
    getMessages(userId, 100, adapter, lv);
    final Runnable poll = new Runnable() {
      @Override
      public void run() {
        getMessages(userId, 10, adapter, lv);
      }
    };
    mPoll = poll;
    final Runnable pollTimer = new Runnable() {
      @Override
      public void run() {
        if (!getActivity().isFinishing() && !getActivity().destroyed()) {
          poll.run();
          Async.dispatchMain(this, 10000);
        }
      }
    };
    pollTimer.run();
    final EditText etMessage = (EditText)findViewById(R.id.etMessage);
    final Button btSend = (Button)findViewById(R.id.btSend);
    final Runnable sendMessage = new Runnable() {
      @Override
      public void run() {
        final String text = etMessage.getText().toString().trim();
        if (text.length() > 0) {
          etMessage.setText(null);
          final String groupId = Message.getGroup(userId, User.meId());
          final Message message = new Message();
          message.setGroupId(groupId);
          message.setText(text);
          message.setUserId(User.meId());
          UIUtils.sendMessagePushNotification(text, userId);
          NotificationCenter.broadcastChange(mNotificationKey, null, null);
          message.saveInBackground(new SaveCallback() {
            @Override
            public void done(ParseException e) {
              if (e == null) {
                // Success.
                addMessage(message, adapter);
              } else {
                e.printStackTrace();
              }
            }
          });
        }
      }
    };
    etMessage.setOnEditorActionListener(new OnEditorActionListener() {
      @Override
      public boolean onEditorAction(final TextView v, int actionId, KeyEvent event) {
        boolean handled = false;
        if (actionId == EditorInfo.IME_ACTION_SEND) {
          sendMessage.run();
          handled = true;
        }
        return handled;
      }
    });
    btSend.setOnClickListener(new View.OnClickListener() {
      @Override
      public void onClick(View v) {
        sendMessage.run();
      }
    });
  }
  
  private void addMessage(final Message message, final ChatAdapter adapter) {
    final ArrayList<Message> list = new ArrayList<Message>();
    list.add(message);
    addMessages(list, adapter);
  }
  
  private void addMessages(final List<Message> messages, final ChatAdapter adapter) {
    Collections.reverse(messages);
    final List<ChatAdapter.MessageGroup> messageGroups = adapter.processMessages(messages);
    if (messageGroups.size() > 0) {
      adapter.addAll(messageGroups);
    }
    adapter.notifyDataSetChanged();
  }

  @Override
  public void didChange(String key, Object oldValue, Object newValue) {
    if (mNotificationKey.equals(key)) {
      mPoll.run();
    }
  }
}

Java Source Code List

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