问如何在android View上循环以添加数据库中的文本？

EN

// Instantiate Views for Rolls:
mRoll1 = findViewById(R.id.rollno1);
mRoll2 = findViewById(R.id.rollno2);
mRoll3 = findViewById(R.id.rollno3);
mRoll4 = findViewById(R.id.rollno4);
mRoll5 = findViewById(R.id.rollno5);
mRoll6 = findViewById(R.id.rollno6);
mRoll7 = findViewById(R.id.rollno7);
mRoll8 = findViewById(R.id.rollno8);

// Read from the database
mRootReference.addListenerForSingleValueEvent (new ValueEventListener() { 
    @Override
    public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
        // This method is called once with the initial value and again
        // whenever data at this location is updated.
        for (DataSnapshot snapshot : dataSnapshot.getChildren()) { 
            mRolll.setText(snapshot.getKey());
        }
    }
    @Override
    public void onCancelled(@NonNull DatabaseError error) { 
        //Failed to read value
    }
});