Java Recyclerview在更新时移动到底部
您好,我正在创建聊天应用程序。应用程序运行良好。但是,每当收到新消息时(通过后台服务),iam都会更新recylerview,然后用户必须向下滚动以查看新消息 我想做的是,当收到新消息时,我想更新recyclerview并滚动到底部。这样,用户无需滚动即可看到最后收到的消息 聊天活动Java Recyclerview在更新时移动到底部,java,android,xml,android-recyclerview,Java,Android,Xml,Android Recyclerview,您好,我正在创建聊天应用程序。应用程序运行良好。但是,每当收到新消息时(通过后台服务),iam都会更新recylerview,然后用户必须向下滚动以查看新消息 我想做的是,当收到新消息时,我想更新recyclerview并滚动到底部。这样,用户无需滚动即可看到最后收到的消息 聊天活动 public class Chatting extends AppCompatActivity { private DrawerLayout drawerLayout; private Appl
public class Chatting extends AppCompatActivity {
private DrawerLayout drawerLayout;
private ApplicationEnvironmentURL applicationEnvironment;
private Toolbar toolbar;
private SelectVisitorService mService = new SelectVisitorService();
private boolean mBound = false;
public static Context baseContext;
private static String uniqueID;
public static ChattingAdapter mAdapter ;
public static List<ChattingItomObject> messageItems = new ArrayList<ChattingItomObject>();
private RecyclerView recyclerView;
public String ProfileId;
public String profileToken;
public String CompanyID;
public String DisplayName;
public String visitor_id;
public String visitor_name;
private EditText chat_message;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_chatting);
SharedPreferences prefs = getSharedPreferences("zupportdesk", MODE_PRIVATE);
ProfileId = prefs.getString("ProfileId", "Not defined");
profileToken = prefs.getString("profileToken", "Not defined");
CompanyID = prefs.getString("companyId", "Not defined");
DisplayName = prefs.getString("DisplayName", "Not defined");
chat_message = (EditText) findViewById(R.id.ET_chating_message);
baseContext = getBaseContext();
Intent intent = getIntent();
visitor_id = intent.getStringExtra("visitor_id");
visitor_name = intent.getStringExtra("visitor_name");
toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
initNavigationDrawer();
ActionBar actionBar = getSupportActionBar();
actionBar.setTitle(visitor_name);
uniqueID = UUID.randomUUID().toString();
Log.d("GUIID", uniqueID);
// add some items to list to test
messageItems.add(new ChattingItomObject("VisitorID", visitor_name+" has joined the chat!", "", "Other", "UserName", "Other", uniqueID));
messageItems.add(new ChattingItomObject("VisitorID", "Hi, how can I help you today?", "", "Other", "UserName", "Other", uniqueID));
messageItems.add(new ChattingItomObject("VisitorID", DisplayName+" has joined the chat!", "", "Other", "UserName", "Other", uniqueID));
recyclerView = (RecyclerView) findViewById(R.id.recycler_chat);
mAdapter = new ChattingAdapter(this, messageItems);
LinearLayoutManager layoutManager = new LinearLayoutManager(this);
recyclerView.setLayoutManager(layoutManager);
recyclerView.setItemAnimator(new DefaultItemAnimator());
recyclerView.setAdapter(mAdapter);
}
public static void updateChatting(String visitor_id, String message, String date_time, String operator_type, String visitor_name){
Uri notification = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
Ringtone r = RingtoneManager.getRingtone(Chatting.baseContext, notification);
r.play();
uniqueID = UUID.randomUUID().toString();
Log.d("GUIID", uniqueID);
messageItems.add(new ChattingItomObject(visitor_id, message, date_time, operator_type, visitor_name, "Message_Type", uniqueID));
Handler refresh = new Handler(Looper.getMainLooper());
refresh.post(new Runnable() {
public void run(){mAdapter.notifyDataSetChanged();}
});
}
活动聊天XML
<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/drawer"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
tools:openDrawer="start"
tools:context="zupportdesk.desk.zupport.chatsystem.Chatting">
<android.support.design.widget.CoordinatorLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
tools:context="com.learn2crack.myapplication.MainActivity">
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:id="@+id/user_details_app_bar"
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>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v7.widget.RecyclerView
android:id="@+id/recycler_chat"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:scrollbars="none"
android:layout_marginTop="55dp"
android:layout_marginBottom="45dp" />
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="50dp"
android:background="@color/colorPrimaryDark"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true">
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:textColorHint="#CFD8DC"
android:textColor="#CFD8DC"
android:hint="Write a message"
android:id="@+id/ET_chating_message"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_toLeftOf="@+id/IV_Chatting_send"
android:layout_toStartOf="@+id/IV_Chatting_send"
android:layout_marginLeft="10dp" />
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="5"
android:padding="4dp"
android:onClick="send_chat_message"
android:src="@android:drawable/ic_menu_send"
android:id="@+id/IV_Chatting_send"
android:layout_alignBottom="@+id/ET_chating_message"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true" />
</RelativeLayout>
</RelativeLayout>
</android.support.design.widget.CoordinatorLayout>
<android.support.design.widget.NavigationView
android:id="@+id/navigation_view"
android:layout_height="match_parent"
android:layout_width="wrap_content"
android:layout_gravity="start"
app:headerLayout="@layout/nav_header"
app:menu="@menu/menu_navigation"/>
</android.support.v4.widget.DrawerLayout>
当您向适配器添加新消息时,是否有人可以帮助我在更新时在
updateCatting
方法中将Recyclerview滚动到底。。那个时候调用这个方法
recyclerViewObject.scrollToPosition(chatArrayList.size() - 1);
将新消息添加到适配器时。那个时候调用这个方法
recyclerViewObject.scrollToPosition(chatArrayList.size() - 1);
在notifyDataSetChanged()之后调用此函数。: 另外,当您仅向recyclerView添加新项目时,而不是调用
notifyDataSetChanged()
时,您可以调用:
mAdapter.notifyItemInserted(mAdapter.getItemCount()-1);
在notifyDataSetChanged()之后调用此函数。: 另外,当您仅向recyclerView添加新项目时,而不是调用
notifyDataSetChanged()
时,您可以调用:
mAdapter.notifyItemInserted(mAdapter.getItemCount()-1);
在更新回收视图时调用此函数
recyclerView.post(new Runnable() {
@Override
public void run() {
recyclerView.smoothScrollToPosition(adapter.getItemCount());
}
});
在更新回收视图时调用此函数
recyclerView.post(new Runnable() {
@Override
public void run() {
recyclerView.smoothScrollToPosition(adapter.getItemCount());
}
});
这是聊天应用程序的最佳选择
这是聊天应用程序的最佳选择
Tnx兄弟。你节省了我的时间。你节省了我的时间。
recyclerView.setAdapter(adapter);
recyclerView.getAdapter().getItemCount();
adapter.notifyDataSetChanged();
recyclerView.getLayoutManager().scrollToPosition(user_arr.size() - 1);