无法使用FirebaseRecyclerAdapter加载多个行 [英] Unable to load more than one row using FirebaseRecyclerAdapter

问题描述

我试图从firebase中获取数据，使用firebaseRecyclerAdapter。但我无法将Firebase数据库中的所有数据填充到RecyclerView中。
数据库如下：

我得到的输出只是从qqq行

rvlist Class：

  public class rvlist {
 String name，propellant; 
 $ b public rvlist（）{
} 
 
 public rvlist（String name，String propellant）{
 this.name = name; 
 this.propellant =推进剂; 
} 
 
 public String getName（）{
 return name; 
} 
 
 public String getPropellant（）{
 return propellant; 
 
 
 
 
 $ MyViewHolder 
 
 
  public class MyViewHolder extends RecyclerView.ViewHolder {
 View mView; 
 
 public MyViewHolder（View itemView）{
 super（itemView）; 
 mView = itemView; 
 
 
 public void setName（String name）{
 TextView field =（TextView）mView.findViewById（R.id.a）; 
 field.setText（name）; 
 
 
 public void setPropellant（String text）{
 TextView field =（TextView）mView.findViewById（R.id.b）; 
 field.setText（text）; 
 
 
 
 
 $ MainActivity：
 
 
  public class MainActivity extends AppCompatActivity {
 
 DatabaseReference mRef; 
 RecyclerView rv; 
 ProgressBar pb; 
 @Override 
 protected void onCreate（Bundled savedInstanceState）{
 super.onCreate（savedInstanceState）; 
 
 setContentView（R.layout.activity_main）; 
工具栏工具栏=（工具栏）findViewById（R.id.toolbar）; 
 setSupportActionBar（toolbar）; 
 
 pb =（ProgressBar）findViewById（R.id.pb）; 
 pb.setVisibility（View.VISIBLE）; 
 rv =（RecyclerView）findViewById（R.id.rvv）; 
 rv.setLayoutManager（新的LinearLayoutManager（this））; 
 
 mRef = FirebaseDatabase.getInstance（）。getReference（）。child（table）; 
 
 
 @Override 
 protected void onStart（）{
 super.onStart（）; 
 
 FirebaseRecyclerAdapter< rvlist，MyViewHolder> recyclerAdapter =新的FirebaseRecyclerAdapter< rvlist，MyViewHolder> 
（rvlist.class，R.layout.model，MyViewHolder.class，mRef）{
 @Override 
 public void populateViewHolder（MyViewHolder itemsViewHolder，rvlist items，int position）{
 pb.setVisibility（View.GONE）; 
 itemsViewHolder.setName（items.getName（））; 
 itemsViewHolder.setPropellant（items.getPropellant（））; 
} 
}; 
 rv.setAdapter（recyclerAdapter）; 
 
 
 $ / code $ / pre 
 
解决方案
 Make确定您的RecyclerView和适配器layout_height设置为  wrap_content  不匹配
 < android.support.v7.widget.RecyclerView 
 android：id =@ + id / recv_location
 android：layout_width =match_parent
 android：layout_height =wrap_content
 app：layoutManager =LinearLayoutManager
 ...> 
< /android.support.v7.widget.RecyclerView> 
  
 
I am trying to fetch the data from firebase, using firebaseRecyclerAdapter. But I am unable to populate all the data from the firebase database to the RecyclerView.
Database is as follows:



The output I am getting is only from the "qqq" row

rvlist Class:
public class rvlist {
String name, propellant;

public rvlist() {
}

public rvlist(String name, String propellant) {
    this.name = name;
    this.propellant = propellant;
}

public String getName() {
    return name;
}

public String getPropellant() {
    return propellant;
    }
} 
MyViewHolder:
public class MyViewHolder extends RecyclerView.ViewHolder {
View mView;

public MyViewHolder(View itemView) {
    super(itemView);
    mView = itemView;
}

public void setName(String name) {
    TextView field = (TextView) mView.findViewById(R.id.a);
    field.setText(name);
}

public void setPropellant(String text) {
    TextView field = (TextView) mView.findViewById(R.id.b);
    field.setText(text);
    }
}
MainActivity:
public class MainActivity extends AppCompatActivity {

DatabaseReference mRef;
RecyclerView rv;
ProgressBar pb;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_main);
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);

    pb = (ProgressBar)findViewById(R.id.pb);
    pb.setVisibility(View.VISIBLE);
    rv = (RecyclerView) findViewById(R.id.rvv);
    rv.setLayoutManager(new LinearLayoutManager(this));

    mRef = FirebaseDatabase.getInstance().getReference().child("table");
}

@Override
protected void onStart() {
    super.onStart();

    FirebaseRecyclerAdapter<rvlist, MyViewHolder> recyclerAdapter = new FirebaseRecyclerAdapter<rvlist, MyViewHolder>
            (rvlist.class, R.layout.model, MyViewHolder.class, mRef) {
        @Override
        public void populateViewHolder(MyViewHolder itemsViewHolder, rvlist items, int position) {
            pb.setVisibility(View.GONE);
            itemsViewHolder.setName(items.getName());
            itemsViewHolder.setPropellant(items.getPropellant());
        }
    };
    rv.setAdapter(recyclerAdapter);
    }
}

解决方案
Make sure your RecyclerView and adapter layout_height is set to wrap_content not to match_parent 
<android.support.v7.widget.RecyclerView
        android:id="@+id/recv_location"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:layoutManager="LinearLayoutManager"
        ...>
</android.support.v7.widget.RecyclerView>


                        
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