1
我有一個數據庫，我的數據看起來像這樣。Firebase Recycler Adapter不適用於兒童的回收站視圖
我已經使用火力地堡回收站適配器爲S1，S2等的信息，來表示在再循環器視圖的數據。但是，數據不會僅在我的應用程序中顯示。該應用程序供老師通過從Firebase檢索數據來查看學生是否在場。
AttendaceFrag.java
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.os.Bundle;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import android.widget.Toast;
import com.firebase.ui.database.FirebaseRecyclerAdapter;
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;
public class AttendanceFrag extends Fragment {
RecyclerView recyclerView;
DatabaseReference databaseReference;
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.activity_attendance_frag, container, false);
recyclerView = (RecyclerView) v.findViewById(R.id.recycler_view);
recyclerView.setHasFixedSize(true);
recyclerView.setLayoutManager(new LinearLayoutManager(getContext()));
databaseReference = FirebaseDatabase.getInstance().getReference().child("Student");
databaseReference.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
if (dataSnapshot != null) {
Toast.makeText(getContext(), "Data to show", Toast.LENGTH_LONG).show();
startShowing();
}
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
return v;
}
private void startShowing() {
FirebaseRecyclerAdapter<Student, AttendanceFrag.RequestViewHolder> firebaseRecyclerAdapter = new FirebaseRecyclerAdapter<Student, AttendanceFrag.RequestViewHolder>(
Student.class,
R.layout.custom_row,
AttendanceFrag.RequestViewHolder.class,
databaseReference
) {
@Override
protected void populateViewHolder(AttendanceFrag.RequestViewHolder viewHolder, Student model, int position) {
viewHolder.setName(model.getName());
viewHolder.setAp(model.getAp());
viewHolder.setRegno(model.getRegno());
}
};
recyclerView.setAdapter(firebaseRecyclerAdapter);
}
public static class RequestViewHolder extends RecyclerView.ViewHolder {
View mView;
public RequestViewHolder(View itemView) {
super(itemView);
mView = itemView;
}
public void setName(String name) {
TextView stname = (TextView) mView.findViewById(R.id.st_name);
stname.setText(name);
}
public void setRegno(String regno) {
TextView stregno = (TextView) mView.findViewById(R.id.st_regno);
stregno.setText(regno);
}
public void setAp(String ap) {
TextView stap = (TextView) mView.findViewById(R.id.st_ap);
stap.setText(ap);
}
}
}
Student.java
public class Student {
private String name, regno,ap;
public Student(String name, String regno, String ap) {
this.name = name;
this.regno = regno;
this.ap = ap;
}
public Student() {
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getRegno() {
return regno;
}
public void setRegno(String regno) {
this.regno = regno;
}
public String getAp() {
return ap;
}
public void setAp(String ap) {
this.ap = ap;
}
}
activity_attendance_frag.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:padding="3dp"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.xxx.AttendanceFrag">
<TableLayout
android:id="@+id/table_lay"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<TableRow
android:id="@+id/firstrow"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:background="@drawable/r1"
android:text="Sr. No."
android:id="@+id/srnohead"
android:textAlignment="center"
android:padding="5dp"
android:textColor="@color/colorPrimaryDark"
/>
<TextView
android:padding="5dp"
android:textAlignment="center"
android:background="@drawable/r1"
android:text="Reg. Number"
android:layout_width="135dp"
android:id="@+id/regNohead"
android:textColor="@color/colorPrimaryDark"/>
<TextView
android:padding="5dp"
android:background="@drawable/r1"
android:text="Name"
android:textAlignment="center"
android:layout_height="wrap_content"
android:layout_width="120dp"
android:id="@+id/namehead"
android:textColor="@color/colorPrimaryDark"/>
<TextView
android:padding="5dp"
android:background="@drawable/r1"
android:text="P/A"
android:layout_height="wrap_content"
android:id="@+id/attnhead"
android:textColor="@color/colorPrimaryDark"/>
</TableRow>
</TableLayout>
<android.support.v7.widget.RecyclerView
android:id="@+id/recycler_view"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/table_lay"
android:layout_alignParentStart="true"
android:layout_marginTop="33dp" />
</RelativeLayout>
custom_row.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal" android:layout_width="match_parent"
android:layout_height="match_parent"
android:weightSum="1"
android:padding="3dp">
<TextView
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:background="@drawable/r1"
android:text="Sr. No."
android:id="@+id/st_sr"
android:textAlignment="center"
android:padding="5dp"
android:textColor="@color/colorPrimaryDark"
/>
<TextView
android:layout_height="wrap_content"
android:layout_width="135dp"
android:padding="5dp"
android:textAlignment="center"
android:background="@drawable/r1"
android:text="Reg. Number"
android:id="@+id/st_regno"
android:textColor="@color/colorPrimaryDark"/>
<TextView
android:padding="5dp"
android:background="@drawable/r1"
android:text="Name"
android:textAlignment="center"
android:layout_height="wrap_content"
android:layout_width="120dp"
android:id="@+id/st_name"
android:textColor="@color/colorPrimaryDark"/>
<TextView
android:layout_width="wrap_content"
android:padding="5dp"
android:background="@drawable/r1"
android:text="P/A"
android:layout_height="wrap_content"
android:id="@+id/st_ap"
android:textColor="@color/colorPrimaryDark"/>
</LinearLayout>