清单无法套用至boolean android

Question

我想从数据库中提取布尔数据，但是我的代码是错误的。如何将布尔数据分配给getstate变量？我想将数据库中的数据分配给产品类中的getstate变量。我该怎么办？
我在行上收到此错误：

  

productList.add（p.getStates（））;

：我收到错误消息：

  

列表不能应用于布尔值

public class MainActivity extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener {
    DatabaseReference mDatabase = FirebaseDatabase.getInstance().getReference();
    final   DatabaseReference ref = mDatabase.child("0").child("states");
    List<Product> productList;

dbProducts.addListenerForSingleValueEvent(new ValueEventListener() {
            @Override
            public void onDataChange(DataSnapshot dataSnapshot) {
                productList = new ArrayList<>();

                if(dataSnapshot.exists()){

                    for(DataSnapshot productSnapshot : dataSnapshot.getChildren()){
                        Product p = productSnapshot.getValue(Product.class);
                        productList.add(p);
                    }
                    ref.addValueEventListener(new ValueEventListener() {
                        @Override
                        public void onDataChange(DataSnapshot snapshot) {
                            Product p = snapshot.getValue(Product.class);

                            productList.add(p.getStates());
                       }
                        @Override
                        public void onCancelled(DatabaseError databaseError) {
                        }
                    });

public class Product {

    private String places;
    private String time;
    private String title;
    private String id;
    private boolean States;

    public Product(){

    }

    public Product(String places, String time, String title, String id, boolean States) {
        this.places = places;
        this.time = time;
        this.title = title;
        this.id = id;
        this.States = States;

    }

    public String getplaces() {
        return places;
    }

    public String gettime() {
        return time;
    }

    public String gettitle() {
        return title;
    }

    public String getid() {
        return id;
    }

    public boolean getStates() {
        return States;
    }

}

Answer 1

您试图在包含产品的列表中添加布尔值。正确的方法是：

productList.add(p);