Firebase RecyclerView显示一项 [英] Firebase RecyclerView Displays One Item
本文介绍了Firebase RecyclerView显示一项的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
在我的数据库中，我的条目包含多首歌曲.这是数据库的外观，以及显示内容:
In my database, I have entries with multiple songs. This is what it the DB looks like, and what is showing in the display:
"DjSunGazer" : {
"song" : {
"-LmHrkYkU1qD2GND9wY2" : "Blaya - Cash",
"-LmHrlalIVUStU6nqBJI" : "Blaya - Cash",
"-LmHrmRRXy4UYoF7DNZz" : "Taylor Swift - You Need to Calm Down"
}
},
在我的应用程序中，我能够使用哈希图为每首独特的歌曲分配一个计数器.现在，在Firebase RecyclerView适配器中，它仅显示数据库中的最后一个条目.这是代码:
In my app, I was able to use a hashmap to assign each unique song with a counter. Now, in the Firebase RecyclerView Adapter it only shows the last entry in the database. Here is the code:
query = mProfileDatabase.child(djName);
FirebaseRecyclerOptions<DataSnapshot> firebaseRecyclerOptions =
new FirebaseRecyclerOptions.Builder<DataSnapshot>()
.setQuery(query, new SnapshotParser<DataSnapshot>(){
@NonNull
@Override
public DataSnapshot parseSnapshot(@NonNull DataSnapshot snapshot)
{
return snapshot;
}
}).build();
final HashMap<String, Integer> songCounts = new HashMap<String, Integer>();
firebaseRecyclerAdapter =
new FirebaseRecyclerAdapter<DataSnapshot, ResultsViewHolder>(firebaseRecyclerOptions)
{
@Override
protected void onBindViewHolder(@NonNull ResultsViewHolder holder, int position, @NonNull DataSnapshot model)
{
List<String> sArr = new ArrayList<String>();
for(DataSnapshot snapshot : model.getChildren())
{
sArr.add(snapshot.getValue(String.class));
}
for(int i = 0; i < sArr.size(); i++)
{
String eachSong = sArr.get(i);
if(songCounts.containsKey(eachSong))
{
int count = songCounts.get(eachSong);
songCounts.put(eachSong, count + 1);
}
else
{
songCounts.put(eachSong, 1);
}
}
Collection<String> name = songCounts.keySet();
Collection<Integer> ctn = songCounts.values();
for(String s2 : name)
{
Log.d("INFO", s2);
DisplaySong ds = new DisplaySong(s2);
ds.setSong(s2);
holder.setDJNameView(ds);
}
for(Integer i : ctn)
{
holder.setBadgeCount(i);
}
}
@NonNull
@Override
public ResultsViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i)
{
View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.djname_item, viewGroup, false);
return new ResultsViewHolder(view);
}
};
firebaseRecyclerAdapter.startListening();
recyclerView.setAdapter(firebaseRecyclerAdapter);
songCounts.clear();
我不仅希望它在recyclerview中显示为"Rick Ross-Gold Roses(feat.Drake)"(带有1个徽章，表示数据库中仅出现一个值)的值，我希望它显示"Ginuwine-So Anxious"(Ginuwine-So Anxious)( 3)以及该第一个条目以下.这已经在我的songCounts HashMap中进行了计算和处理.谢谢！
Instead of just the value showing in the recyclerview as "Rick Ross - Gold Roses (feat.Drake)" with a 1 badge saying theres only one occurrence in the DB, I want it to display "Ginuwine - So Anxious"(3) as well below that first entry. This has already been calculated and handled in my songCounts HashMap. Thanks!
编辑添加了dj_name_item.xml
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:padding="8dp">
<TextView
android:id="@+id/song_result_dj"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:layout_marginLeft="30dp"
android:layout_marginRight="30dp" />
<TextView
android:id="@+id/song_badge"
android:layout_width="20dp"
android:layout_height="20dp"
android:layout_gravity="right|end|top"
android:layout_marginTop="3dp"
android:layout_marginEnd="-5dp"
android:layout_marginRight="15dp"
android:background="@drawable/badge_background"
android:gravity="center"
android:padding="3dp"
android:paddingRight="15dp"
android:text="0"
android:textColor="@android:color/white"
android:textSize="10sp" />
</RelativeLayout>
添加了如何插入数据
FirebaseDatabase.getInstance().getReference().child(djName).child("song").push().setValue(songName);
推荐答案
修复了我的解决方案，以使用自定义Firebase适配器.这有助于解决我手动添加每个子视图的问题.
Fixed my solution to use a custom firebase adapter. This helped fix my issue of adding each child view manually.
songNames = new ArrayList<String>();
mProfileDatabase.addListenerForSingleValueEvent(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot)Aft
{
mProfileDatabase.child(djName).child("song")
.addListenerForSingleValueEvent(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
List<String> sArr = new ArrayList<String>();
for(DataSnapshot snapshot:dataSnapshot.getChildren()){
sArr.add(snapshot.getValue(String.class));
}
LinkedHashMap<String, Integer> songCounts = new LinkedHashMap<>();
for(int i = 0; i < sArr.size(); i++)
{
String eachSong = sArr.get(i);
if(songCounts.containsKey(eachSong))
{
int count = songCounts.get(eachSong);
songCounts.put(eachSong, count + 1);
}
else
{
songCounts.put(eachSong, 1);
}
}
ArrayList<POJO> arrayList = new ArrayList<>();
for(Map.Entry<String,Integer> s:songCounts.entrySet()){
POJO pojo = new POJO(s.getKey(),s.getValue());
arrayList.add(pojo);
}
CustomRecyclerAdapter adapter = new CustomRecyclerAdapter(DjLanding.this,arrayList);
recyclerView.setAdapter(adapter);
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError) {
}
});
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError) {
}
});
这是我的自定义适配器的定义:
Here is the definition of my Custom Adapter:
public class CustomRecyclerAdapter extends RecyclerView.Adapter<CustomRecyclerAdapter.ViewHolder>
{
private Context context;
private ArrayList<POJO> personUtils;
public CustomRecyclerAdapter(Context context, ArrayList<POJO> personUtils) {
this.context = context;
this.personUtils = personUtils;
}
@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.djname_item, parent, false);
ViewHolder viewHolder = new ViewHolder(v);
return viewHolder;
}
@Override
public void onBindViewHolder(ViewHolder holder, int position) {
holder.itemView.setTag(personUtils.get(position));
POJO pu = personUtils.get(position);
holder.djNameView.setText(pu.getName());
holder.badge.setText(pu.getCount()+"");
}
@Override
public int getItemCount() {
return personUtils.size();
}
public class ViewHolder extends RecyclerView.ViewHolder
{
public TextView djNameView;
public TextView badge;
public ViewHolder(View itemView) {
super(itemView);
djNameView = itemView.findViewById(R.id.song_result_dj);
badge = itemView.findViewById(R.id.song_badge);
}
}
}
这是我普通的旧Java类:
Here's my plain old java class:
public class POJO
{
String name;
Integer count;
public POJO(String name, Integer count) {
this.name = name;
this.count = count;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Integer getCount() {
return count;
}
public void setCount(Integer count) {
this.count = count;
}
}
感谢哈里奥姆！
这篇关于Firebase RecyclerView显示一项的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
查看全文
