我正在使用Firebase数据和RecyclerView Adapter。
该方案是当用户点击列表时，初始状态UNREAD将更改为READ，因此TypeFace应从BOLD更改为{{1} }}。
我目前将状态从NORMAL更改为UNREAD的后端流程正在运行并更新到Firebase，但我的特定READ项的界面不会更改{{ 1}}到RecyclerView。
我认为无需回忆 Firebase数据 以便读取状态，但界面应根据用户点击进行更改。
任何人都可以帮助我吗？
BOLD ：
NORMAL NotificationActivity.java ：
package com.myapp.activity.notification;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.view.ActionMode;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.LinearLayout;
import android.widget.Toast;
import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.Task;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.database.DataSnapshot;
import com.google.firebase.database.DatabaseError;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import com.google.firebase.database.ValueEventListener;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.material.nereeducation.R;
import com.material.nereeducation.adapter.AdapterNotification;
import com.material.nereeducation.model.Notification;
import com.material.nereeducation.utils.Tools;
import com.material.nereeducation.widget.LineItemDecoration;
import java.util.ArrayList;
import java.util.List;
public class NotificationActivity extends AppCompatActivity {
private RecyclerView recyclerView;
private AdapterNotification mAdapter;
private ActionModeCallback actionModeCallback;
private ActionMode actionMode;
private Toolbar toolbar;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_notification);
initToolbar();
initComponent();
Tools.setSystemBarColor(this, R.color.black);
}
private void initToolbar() {
toolbar = findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
getSupportActionBar().setTitle("Notifications");
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
}
private List<Notification> items = new ArrayList<>();
private LinearLayout messageEmptyList;
private void initComponent() {
messageEmptyList = findViewById(R.id.messageEmptyList);
recyclerView = findViewById(R.id.recyclerView);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
recyclerView.addItemDecoration(new LineItemDecoration(this, LinearLayout.VERTICAL));
recyclerView.setHasFixedSize(true);
//set data and list adapter
mAdapter = new AdapterNotification(this, items);
recyclerView.setAdapter(mAdapter);
mAdapter.setOnClickListener(new AdapterNotification.OnClickListener() {
@Override
public void onItemClick(View view, Notification obj, int pos) {
if (mAdapter.getSelectedItemCount() > 0) {
enableActionMode(pos);
} else {
// read the inbox which removes bold from the row
Notification notification = mAdapter.getItem(pos);
Toast.makeText(getApplicationContext(), "Read: " + notification.sender_id, Toast.LENGTH_SHORT).show();
updateStatus(notification.notificationId,"read",pos);
}
}
@Override
public void onItemLongClick(View view, Notification obj, int pos) {
enableActionMode(pos);
}
});
actionModeCallback = new ActionModeCallback();
getNotificationData();
}
private void getNotificationData()
{
items.clear();
GsonBuilder builder = new GsonBuilder();
final Gson gson = builder.create();
FirebaseAuth firebaseAuth = FirebaseAuth.getInstance();
String uuid = firebaseAuth.getUid();
FirebaseDatabase firebaseDatabase = FirebaseDatabase.getInstance();
DatabaseReference databaseReference = firebaseDatabase.getReference();
databaseReference.child("notifications/"+uuid+"/data_notification").orderByChild("status").startAt("read").endAt("unread").addListenerForSingleValueEvent(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
if(dataSnapshot.getValue() != null)
{
for(DataSnapshot snapshot: dataSnapshot.getChildren())
{
String dataReceived = gson.toJson(snapshot.getValue());
Notification notificationItems = gson.fromJson(dataReceived, Notification.class);
items.add(notificationItems);
}
mAdapter.notifyDataSetChanged();
}else
{
messageEmptyList.setVisibility(View.VISIBLE);
}
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
private void updateStatus(final String notificationId, String status, final int position) {
FirebaseAuth firebaseAuth = FirebaseAuth.getInstance();
String uuid = firebaseAuth.getUid();
FirebaseDatabase firebaseDatabase = FirebaseDatabase.getInstance();
DatabaseReference databaseReference = firebaseDatabase.getReference();
databaseReference.child("notifications/"+uuid+"/data_notification").child(notificationId).child("status").setValue(status
).addOnCompleteListener(new OnCompleteListener<Void>() {
@Override
public void onComplete(@NonNull Task<Void> task) {
mAdapter.notifyItemChanged(position); //Problem here - how to update text from BOLD to NORMAL for this item?
}
});
}
private void enableActionMode(int position) {
if (actionMode == null) {
actionMode = startSupportActionMode(actionModeCallback);
}
toggleSelection(position);
}
private void toggleSelection(int position) {
mAdapter.toggleSelection(position);
int count = mAdapter.getSelectedItemCount();
if (count == 0) {
actionMode.finish();
} else {
actionMode.setTitle(String.valueOf(count));
actionMode.invalidate();
}
}
private class ActionModeCallback implements ActionMode.Callback {
@Override
public boolean onCreateActionMode(ActionMode mode, Menu menu) {
mode.getMenuInflater().inflate(R.menu.menu_delete, menu);
return true;
}
@Override
public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
return false;
}
@Override
public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
int id = item.getItemId();
if (id == R.id.action_delete) {
deleteInboxes();
mode.finish();
return true;
}
return false;
}
@Override
public void onDestroyActionMode(ActionMode mode) {
mAdapter.clearSelections();
actionMode = null;
}
}
private void deleteInboxes() {
List<Integer> selectedItemPositions = mAdapter.getSelectedItems();
for (int i = selectedItemPositions.size() - 1; i >= 0; i--) {
mAdapter.removeData(selectedItemPositions.get(i));
}
mAdapter.notifyDataSetChanged();
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
if (item.getItemId() == android.R.id.home) {
finish();
} else {
Toast.makeText(getApplicationContext(), item.getTitle(), Toast.LENGTH_SHORT).show();
}
return super.onOptionsItemSelected(item);
}
}
答案 0 :(得分：0)
你也需要为这种情况处理ELSE
if(notification.status.equals("unread")){
holder.from.setTypeface(Typeface.defaultFromStyle(Typeface.BOLD));
holder.title.setTypeface(Typeface.defaultFromStyle(Typeface.BOLD));
}else{
holder.from.setTypeface(Typeface.defaultFromStyle(Typeface.NORMAL));
holder.title.setTypeface(Typeface.defaultFromStyle(Typeface.NORMAL));
}
答案 1 :(得分：0)
如果你想在适配器中设置textview不同的字体或颜色，你需要检查每个位置，所以在你的情况下，你只需要为textview设置字体粗体，你必须为默认的textview字体再次设置字体。
在适配器中设置字体Normal。
为textview设置文本默认字体Normal，如下所示。
holder.from.setTypeface(Typeface.defaultFromStyle(Typeface.NORMAL));
holder.title.setTypeface(Typeface.defaultFromStyle(Typeface.NORMAL));
然后检查未读的项目状态
if(notification.status.equals("unread")){
holder.from.setTypeface(Typeface.defaultFromStyle(Typeface.BOLD));
holder.title.setTypeface(Typeface.defaultFromStyle(Typeface.BOLD));
}
答案 2 :(得分：0)
所以我猜你的问题是状态（读/未读）应用于数据库，但没有反映在回收站视图上。
如果这是问题，主要是因为你没有处理列表的数据更改方法（并使用新值更新它）。
您目前正在使用它来获取数据：
back.setOnClickListener(new View.OnClickListener() {
if(TextUtils.isEmpty(et1.getText().toString()) {
//your first edit text is empty
}
});
这也无法帮助您控制更改的项目。
可能的解决方案
解决问题的方法是使用（FirebaseUI）数据库而不是自定义适配器。
FirebaseUI将侦听更改并更新列表。
编辑2
使用ChildEventListener而不是Listener For Single Value事件
而不是：
databaseReference.child("notifications/"+uuid+"/data_notification").orderByChild("status").startAt("read").endAt("unread").addListenerForSingleValueEvent(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {.....
使用它：
databaseReference.child("notifications/"+uuid+"/data_notification").orderByChild("status").startAt("read").endAt("unread").addListenerForSingleValueEvent(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {.....
答案 3 :(得分：0)
我相信您应该这样设置字体：
if ("unread".equals(notification.status)) {
holder.from.setTypeface(null, Typeface.BOLD);
holder.title.setTypeface(null, Typeface.BOLD);
} else {
holder.from.setTypeface(null, Typeface.NORMAL);
holder.title.setTypeface(null, Typeface.NORMAL);
}
RecyclerView正在重用该视图，因此一旦将字体设置为粗体，则需要在下次使用它时将其设置为正常。