I am trying to build a simple chat application. With chat conversation screen I'm using ListView with ArrayAdapter to store and show the message but when I receive or send new message, all of recent message is change to.
This is my adapter code:
public class MessageAdapter extends ArrayAdapter<Message> {
private Context context;
private ArrayList<Message> messages;
private DatabaseHelper databaseHelper;
private Message message;
@Override
public void add(Message object) {
messages.add(object);
super.add(object);
}
public MessageAdapter(Context context, int textViewResouceId, ArrayList<Message> messages) {
super(context, textViewResouceId);
this.context = context;
this.messages = messages;
databaseHelper = DatabaseHelper.getInstance(context);
}
public int getCount() {
return messages.size();
}
public Message getItem(int index) {
return messages.get(index);
}
public long getItemId(int position) {
return position;
}
@Override
public int getPosition(Message item) {
return super.getPosition(item);
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
MessageViewHolder messageViewHolder;
if (convertView == null) {
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
convertView = inflater.inflate(R.layout.chat_item, parent, false);
messageViewHolder = new MessageViewHolder();
messageViewHolder.tv_userName = (TextView) convertView.findViewById(R.id.tv_chatName);
messageViewHolder.tv_message = (TextView) convertView.findViewById(R.id.tv_messageContent);
convertView.setTag(messageViewHolder);
} else {
messageViewHolder = (MessageViewHolder) convertView.getTag();
}
message = messages.get(position);
String username = databaseHelper.getUserByUserId(message.getUserId()).getUserName();
if (message.getUserId() == AppConfig.USER_ID) {
messageViewHolder.tv_message.setTextColor(Color.parseColor("#0066ff"));
messageViewHolder.tv_userName.setTextColor(Color.parseColor("#0066ff"));
} else {
messageViewHolder.tv_message.setTextColor(Color.parseColor("#000000"));
messageViewHolder.tv_userName.setTextColor(Color.parseColor("#000000"));
}
messageViewHolder.tv_userName.setText(username);
messageViewHolder.tv_message.setText(message.getMessage());
return convertView;
}
static class MessageViewHolder {
TextView tv_message;
TextView tv_userName;
}
}
This is my ListView Layout code:
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="@style/AppTheme.AppBarOverlay">
<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
app:popupTheme="@style/AppTheme.PopupOverlay" />
</android.support.design.widget.AppBarLayout>
<ScrollView
android:id="@+id/scroll_chat"
android:layout_width="match_parent"
android:layout_height="380dp">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<ListView
android:id="@+id/listMessage"
android:layout_width="match_parent"
android:layout_height="380dp"
android:background="@null"
android:divider="@null"
android:stackFromBottom="true"
android:drawSelectorOnTop="false"
android:transcriptMode="alwaysScroll" />
</LinearLayout>
</ScrollView>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal"
android:weightSum="1">
<EditText
android:id="@+id/txt_chat"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_weight="0.92" />
<Button
android:id="@+id/btn_send"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_marginLeft="30dp"
android:text="@string/btn_send" />
</LinearLayout>
</LinearLayout>
And this is error when I send two message (the same error happen when I receive a message)
I think the problem is the way set the data to View but I cannot solve it. Could anyone help me solve this issue.
This is chat screen when I close and open the activity again: It showed correct message.
This is Chatactivity code:
public class ChatActivity extends AppCompatActivity implements View.OnClickListener {
private Button btn_send;
private static EditText txt_chat;
private String registId;
private Bundle bundle;
private String chatTitle;
private MessageSender mgsSender;
private int userId;
private DatabaseHelper databaseHelper;
private TimeUtil timeUtil;
private MessageAdapter messageAdapter;
private ListView lv_message;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_chat);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
if (getSupportActionBar() != null) {
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
}
btn_send = (Button) findViewById(R.id.btn_send);
txt_chat = (EditText) findViewById(R.id.txt_chat);
lv_message = (ListView) findViewById(R.id.listMessage);
// lv_message.setTranscriptMode(ListView.TRANSCRIPT_MODE_ALWAYS_SCROLL);
timeUtil = new TimeUtil();
databaseHelper = DatabaseHelper.getInstance(getApplicationContext());
btn_send.setOnClickListener(this);
bundle = getIntent().getExtras();
chatTitle = bundle.getString("titleName");
if (getIntent().getBundleExtra("INFO") != null) {
chatTitle = getIntent().getBundleExtra("INFO").getString("name");
this.setTitle(chatTitle);
} else {
this.setTitle(chatTitle);
}
registId = bundle.getString("regId");
userId = databaseHelper.getUser(chatTitle).getUserId();
List<Message> messages = databaseHelper.getMessges(AppConfig.USER_ID, databaseHelper.getUser(chatTitle).getUserId());
messageAdapter = new MessageAdapter(getApplicationContext(), R.layout.chat_item, (ArrayList<Message>) messages);
LocalBroadcastManager.getInstance(this).registerReceiver(onNotice, new IntentFilter("Msg"));
if (messages.size() > 0) lv_message.setAdapter(messageAdapter);
}
private BroadcastReceiver onNotice = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
String message = intent.getStringExtra("message");
try {
Message messageObj = Message.getInstance();
messageObj.setMessage(message);
messageObj.setUserId(userId);
messageObj.setSender_id(AppConfig.USER_ID);
messageObj.setExpiresTime(timeUtil.formatDateTime(timeUtil.getCurrentTime()));
messageAdapter.add(messageObj);
} catch (ParseException e) {
e.printStackTrace();
}
messageAdapter.notifyDataSetChanged();
}
};
@Override
public void onBackPressed() {
super.onBackPressed();
finish();
}
@Override
protected void onDestroy() {
LocalBroadcastManager.getInstance(this).unregisterReceiver(onNotice);
super.onDestroy();
}
private static MessageSenderContent createMegContent(String regId, String title) {
String message = txt_chat.getText().toString();
MessageSenderContent mgsContent = new MessageSenderContent();
mgsContent.addRegId(regId);
mgsContent.createData(title, message);
return mgsContent;
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.btn_send:
String message = txt_chat.getText().toString();
databaseHelper = DatabaseHelper.getInstance(getApplicationContext());
mgsSender = new MessageSender();
new AsyncTask<Void, Void, Void>() {
@Override
protected Void doInBackground(Void... params) {
MessageSenderContent mgsContent = createMegContent(registId, AppConfig.USER_NAME);
mgsSender.sendPost(mgsContent);
return null;
}
}.execute();
databaseHelper.addMessage(message, timeUtil.getCurrentTime(), userId, AppConfig.USER_ID);
txt_chat.setText("");
try {
Message messageObj = Message.getInstance();
messageObj.setMessage(message);
messageObj.setUserId(AppConfig.USER_ID);
messageObj.setSender_id(userId);
messageObj.setExpiresTime(timeUtil.formatDateTime(timeUtil.getCurrentTime()));
messageAdapter.add(messageObj);
} catch (ParseException e) {
e.printStackTrace();
}
messageAdapter.notifyDataSetChanged();
break;
}
}
}
