[Android] Firebase에 등록된 data로 Spinner 생성

 

public class AddSchedule extends AppCompatActivity {
private Spinner spinner;

EditText et_ds; //상세일정 입력

// 파이어베이스 연동
final FirebaseDatabase mDatabase = FirebaseDatabase.getInstance();
// User_pet.java 를 통해 데이터베이스 접근
final DatabaseReference petDB = mDatabase.getReference("User_pet");
String getUserID = ((MainActivity)MainActivity.context_main).lg_ID.getText().toString();

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_add_schedule);

    spinner = findViewById(R.id.Spinner);
    et_ds = findViewById(R.id.et_ds);


    petDB.child(getUserID).child("Pet List").addValueEventListener(new ValueEventListener() {
        @Override
        public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
            final List<String> petName = new ArrayList<String>(); //이름 담을 array

            for (DataSnapshot nameSnapshot: dataSnapshot.getChildren()){ //강아지 담긴 수만큼 받아와서 array에 넣기
                String data = nameSnapshot.getValue().toString();
                petName.add(data);
            }
            //ArrayAdapter 객체 생성
            ArrayAdapter<String> nameAdapter = new ArrayAdapter<String>(AddSchedule.this, android.R.layout.simple_spinner_item, petName);

            nameAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
            spinner.setAdapter(nameAdapter); //어댑터에 연결
        }

        @Override
        public void onCancelled(@NonNull DatabaseError error) {

        }
    });

    //선택된 강아지
    spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
        @Override
        public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
            Toast.makeText(AddSchedule.this, "선택된 강아지 : "+spinner.getItemAtPosition(position),Toast.LENGTH_SHORT).show();

        }

        @Override
        public void onNothingSelected(AdapterView<?> parent) {

        }
    });


 }
}