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私はチャットルームにメッセージのリストを表示していますが、RecycleViewを表示しています。 ビューは、最初の項目の代わりに最近のメッセージ（最後のメッセージ、リストの最後の項目）に設定します。私はsmoothScrollToPositionを使用しましたが、最近のメッセージを見るために最初から最後までスクロールさせたくありません。 whatsappのようになりたいのですが、チャットをクリックすると最後のメッセージが表示されます。どうすればこれを達成できますか？recyclerviewの最後のアイテムにビューを設定する方法
package com.wipro.chat.activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.support.v4.content.LocalBroadcastManager;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.DefaultItemAnimator;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.Toolbar;
import android.text.TextUtils;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
import com.android.volley.DefaultRetryPolicy;
import com.android.volley.NetworkResponse;
import com.android.volley.Request;
import com.android.volley.Response;
import com.android.volley.RetryPolicy;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.StringRequest;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.sql.Timestamp;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
import com.wipro.chat.R;
import com.wipro.chat.adapter.ChatRoomThreadAdapter;
import com.wipro.chat.app.Config;
import com.wipro.chat.app.EndPoints;
import com.wipro.chat.app.MyApplication;
import com.wipro.chat.gcm.NotificationUtils;
import com.wipro.chat.model.Message;
import com.wipro.chat.model.User;
public class ChatRoomActivity extends AppCompatActivity {
private String TAG = ChatRoomActivity.class.getSimpleName();
private String userChatRoomId;
private RecyclerView recyclerView;
private ChatRoomThreadAdapter mAdapter;
private ArrayList<Message> messageArrayList;
private BroadcastReceiver mRegistrationBroadcastReceiver;
private EditText inputMessage;
private Button btnSend;
private String selfUserId;
private String selfUserName;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_chat_room);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
inputMessage = (EditText) findViewById(R.id.message);
btnSend = (Button) findViewById(R.id.btn_send);
Intent intent = getIntent();
userChatRoomId = intent.getStringExtra("user_id");
String title = intent.getStringExtra("name");
getSupportActionBar().setTitle(title);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
if (userChatRoomId == null) {
Toast.makeText(getApplicationContext(), "User Chat room not found!", Toast.LENGTH_SHORT).show();
finish();
}
recyclerView = (RecyclerView) findViewById(R.id.recycler_view);
messageArrayList = new ArrayList<>();
// self user id is to identify the message owner
selfUserId = MyApplication.getInstance().getPrefManager().getUser().getId();
selfUserName = MyApplication.getInstance().getPrefManager().getUser().getName();
mAdapter = new ChatRoomThreadAdapter(this, messageArrayList, selfUserId);
LinearLayoutManager layoutManager = new LinearLayoutManager(this);
recyclerView.setLayoutManager(layoutManager);
recyclerView.setItemAnimator(new DefaultItemAnimator());
recyclerView.setAdapter(mAdapter);
mRegistrationBroadcastReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
if (intent.getAction().equals(Config.PUSH_NOTIFICATION)) {
// new push message is received
handlePushNotification(intent);
}
}
};
btnSend.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
sendMessage();
}
});
fetchChatThread();
}
@Override
protected void onResume() {
super.onResume();
// registering the receiver for new notification
LocalBroadcastManager.getInstance(this).registerReceiver(mRegistrationBroadcastReceiver,
new IntentFilter(Config.PUSH_NOTIFICATION));
NotificationUtils.clearNotifications();
}
@Override
protected void onPause() {
LocalBroadcastManager.getInstance(this).unregisterReceiver(mRegistrationBroadcastReceiver);
super.onPause();
}
/**
* Handling new push message, will add the message to
* recycler view and scroll it to bottom
* */
private void handlePushNotification(Intent intent) {
Message message = (Message) intent.getSerializableExtra("message");
String userChatRoomId = intent.getStringExtra("user_id");
if (message != null && userChatRoomId != null) {
messageArrayList.add(message);
mAdapter.notifyDataSetChanged();
if (mAdapter.getItemCount() > 1) {
recyclerView.getLayoutManager().smoothScrollToPosition(recyclerView, null, mAdapter.getItemCount() - 1);
}
}
}
/**
* Posting a new message in chat room
* will make an http call to our server. Our server again sends the message
* to all the devices as push notification
* */
private void sendMessage() {
final String message = this.inputMessage.getText().toString().trim();
if (TextUtils.isEmpty(message)) {
Toast.makeText(getApplicationContext(), "Enter a message", Toast.LENGTH_SHORT).show();
return;
}
/** Create chatroom with the other user after sending the message**/
String endPointInsert = EndPoints.CHAT_ROOM.replace("_ID_", selfUserId) + "/" + userChatRoomId;
Log.e(TAG, "endpointInsert: " + endPointInsert);
StringRequest strReque = new StringRequest(Request.Method.GET,
endPointInsert, new Response.Listener<String>() {
@Override
public void onResponse(String response) {
Log.e(TAG, "response: " + response);
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
NetworkResponse networkResponse = error.networkResponse;
Log.e(TAG, "Volley error: " + error.getMessage() + ", code: " + networkResponse);
Toast.makeText(getApplicationContext(), "Volley error: " + error.getMessage(), Toast.LENGTH_SHORT).show();
}
});
Date date = new Date();
String createdAt = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(date);
Log.e(TAG, "TIMESTAMP:" + createdAt);
User user = new User(selfUserId, selfUserName);
final Message msg = new Message();
msg.setId("");
msg.setMessage(message);
msg.setCreatedAt(createdAt);
msg.setUser(user);
messageArrayList.add(msg);
mAdapter.notifyDataSetChanged();
if (mAdapter.getItemCount() > 1) {
// scrolling to bottom of the recycler view
recyclerView.getLayoutManager().smoothScrollToPosition(recyclerView, null, mAdapter.getItemCount() - 1);
}
//Log.e(TAG,msg.getId());
String endPoint = EndPoints.USER_MESSAGE.replace("_ID_", userChatRoomId);
Log.e(TAG, "endpoint: " + endPoint);
this.inputMessage.setText("");
StringRequest strReq = new StringRequest(Request.Method.POST,
endPoint, new Response.Listener<String>() {
@Override
public void onResponse(String response) {
Log.e(TAG, "response: " + response);
try {
JSONObject obj = new JSONObject(response);
// check for error
if (obj.getBoolean("error") == false) {
JSONObject commentObj = obj.getJSONObject("message");
String commentId = commentObj.getString("message_id");
String commentText = commentObj.getString("message");
String createdAt = commentObj.getString("created_at");
JSONObject userObj = obj.getJSONObject("user");
String userId = commentObj.getString("from_user_id");
String userName = userObj.getString("name");
User user = new User(userId, userName);
Log.e(TAG, commentId);
msg.setId(commentId);
/*Message message = new Message();
message.setId(commentId);
message.setMessage(commentText);
message.setCreatedAt(createdAt);
message.setUser(user);*/
/*messageArrayList.add(msg);
mAdapter.notifyDataSetChanged();
if (mAdapter.getItemCount() > 1) {
// scrolling to bottom of the recycler view
recyclerView.getLayoutManager().smoothScrollToPosition(recyclerView, null, mAdapter.getItemCount() - 1);
}*/
} else {
Toast.makeText(getApplicationContext(), "" + obj.getString("message"), Toast.LENGTH_LONG).show();
}
} catch (JSONException e) {
Log.e(TAG, "json parsing error: " + e.getMessage());
Toast.makeText(getApplicationContext(), "json parse error: " + e.getMessage(), Toast.LENGTH_SHORT).show();
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
NetworkResponse networkResponse = error.networkResponse;
Log.e(TAG, "Volley error: " + error.getMessage() + ", code: " + networkResponse);
Toast.makeText(getApplicationContext(), "Volley error: " + error.getMessage(), Toast.LENGTH_SHORT).show();
inputMessage.setText(message);
}
}) {
@Override
protected Map<String, String> getParams() {
Map<String, String> params = new HashMap<String, String>();
params.put("user_id", MyApplication.getInstance().getPrefManager().getUser().getId());
params.put("message", message);
Log.e(TAG, "Params: " + params.toString());
return params;
};
};
// disabling retry policy so that it won't make
// multiple http calls
int socketTimeout = 0;
RetryPolicy policy = new DefaultRetryPolicy(socketTimeout,
DefaultRetryPolicy.DEFAULT_MAX_RETRIES,
DefaultRetryPolicy.DEFAULT_BACKOFF_MULT);
strReq.setRetryPolicy(policy);
//Adding request to request queue
MyApplication.getInstance().addToRequestQueue(strReque);
MyApplication.getInstance().addToRequestQueue(strReq);
Log.i(TAG,msg.getId());
}
/**
* Fetching all the messages of a single chat room
* */
private void fetchChatThread() {
String endPointi = EndPoints.CHAT_USER_THREAD.replace("_ID_", userChatRoomId);
String endPoint = endPointi + "/" + selfUserId;
Log.e(TAG, "endPoint: " + endPoint);
StringRequest strReq = new StringRequest(Request.Method.GET,
endPoint, new Response.Listener<String>() {
@Override
public void onResponse(String response) {
Log.e(TAG, "response: " + response);
try {
JSONObject obj = new JSONObject(response);
// check for error
if (obj.getBoolean("error") == false) {
JSONArray commentsObj = obj.getJSONArray("messages");
for (int i = 0; i < commentsObj.length(); i++) {
JSONObject commentObj = (JSONObject) commentsObj.get(i);
String commentId = commentObj.getString("message_id");
String commentText = commentObj.getString("message");
String createdAt = commentObj.getString("created_at");
JSONObject userObj = commentObj.getJSONObject("user");
String userId = userObj.getString("user_id");
String userName = userObj.getString("username");
User user = new User(userId, userName);
Message message = new Message();
message.setId(commentId);
message.setMessage(commentText);
message.setCreatedAt(createdAt);
message.setUser(user);
messageArrayList.add(message);
}
mAdapter.notifyDataSetChanged();
if (mAdapter.getItemCount() > 1) {
recyclerView.getLayoutManager().smoothScrollToPosition(recyclerView, null, 1);
}
} else {
Toast.makeText(getApplicationContext(), "" + obj.getJSONObject("error").getString("message"), Toast.LENGTH_LONG).show();
}
} catch (JSONException e) {
Log.e(TAG, "json parsing error: " + e.getMessage());
Toast.makeText(getApplicationContext(), "json parse error: " + e.getMessage(), Toast.LENGTH_SHORT).show();
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
NetworkResponse networkResponse = error.networkResponse;
Log.e(TAG, "Volley error: " + error.getMessage() + ", code: " + networkResponse);
Toast.makeText(getApplicationContext(), "Volley error: " + error.getMessage(), Toast.LENGTH_SHORT).show();
}
});
//Adding request to request queue
MyApplication.getInstance().addToRequestQueue(strReq);
}
}
package com.wipro.chat.adapter;
/**
* Created by COMP on 17-06-2016.
*/
import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Date;
import com.wipro.chat.R;
import com.wipro.chat.model.Message;
public class ChatRoomThreadAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
private static String TAG = ChatRoomThreadAdapter.class.getSimpleName();
private String userId;
private int SELF = 100;
private static String today;
private Context mContext;
private ArrayList<Message> messageArrayList;
public class ViewHolder extends RecyclerView.ViewHolder {
TextView message, timestamp;
public ViewHolder(View view) {
super(view);
message = (TextView) itemView.findViewById(R.id.message);
timestamp = (TextView) itemView.findViewById(R.id.timestamp);
}
}
public ChatRoomThreadAdapter(Context mContext, ArrayList<Message> messageArrayList, String userId) {
this.mContext = mContext;
this.messageArrayList = messageArrayList;
this.userId = userId;
Calendar calendar = Calendar.getInstance();
today = String.valueOf(calendar.get(Calendar.DAY_OF_MONTH));
}
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View itemView;
// view type is to identify where to render the chat message
// left or right
if (viewType == SELF) {
// self message
itemView = LayoutInflater.from(parent.getContext())
.inflate(R.layout.chat_item_self, parent, false);
} else {
// others message
itemView = LayoutInflater.from(parent.getContext())
.inflate(R.layout.chat_item_other, parent, false);
}
return new ViewHolder(itemView);
}
@Override
public int getItemViewType(int position) {
Message message = messageArrayList.get(position);
if (message.getUser().getId().equals(userId)) {
return SELF;
}
return position;
}
@Override
public void onBindViewHolder(final RecyclerView.ViewHolder holder, int position) {
Message message = messageArrayList.get(position);
((ViewHolder) holder).message.setText(message.getMessage());
String timestamp = getTimeStamp(message.getCreatedAt());
if (message.getUser().getName() != null)
timestamp = message.getUser().getName() + ", " + timestamp;
((ViewHolder) holder).timestamp.setText(timestamp);
}
@Override
public int getItemCount() {
return messageArrayList.size();
}
public static String getTimeStamp(String dateStr) {
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String timestamp = "";
today = today.length() < 2 ? "0" + today : today;
try {
Date date = format.parse(dateStr);
SimpleDateFormat todayFormat = new SimpleDateFormat("dd");
String dateToday = todayFormat.format(date);
format = dateToday.equals(today) ? new SimpleDateFormat("hh:mm a") : new SimpleDateFormat("dd LLL, hh:mm a");
String date1 = format.format(date);
timestamp = date1.toString();
} catch (ParseException e) {
e.printStackTrace();
}
return timestamp;
}
}
また、 'setStackFromEnd'を使用することもできます。https://developer.android.com/reference/android/widget/AbsList View.html＃setStackFromBottom（boolean） –
はい、メッセージを反転しています。しかし、私はそれを望んでいません。リストに最初から最後までのメッセージを表示するが、チャットを開いたときに最後のメッセージが表示されている必要があります。 –
ありがとう!! "setSatckFromEnd"は働いています。 –