安卓Retrofit无响应

Question

你好，我刚接触Retrofit服务，并按照这篇教程https://www.simplifiedcoding.net/retrofit-android-tutorial-to-get-json-from-server/进行操作，效果不错。现在想创建自己的服务，于是使用了一个新的JSON Webhttp://api.androidhive.info/contacts/。

{
"contacts": [
    {
            "id": "c200",
            "name": "Ravi Tamada",
            "email": "[e-mail]",
            "address": "xx-xx-xxxx,x - street, x - country",
            "gender" : "male",
            "phone": {
                "mobile": "[phone]",
                "home": "00 000000",
                "office": "00 000000"
            }
    },
    {
            "id": "c201",
            "name": "Johnny Depp",
            "email": "[e-mail]",
            "address": "xx-xx-xxxx,x - street, x - country",
            "gender" : "male",
            "phone": {
                "mobile": "[phone]",
                "home": "00 000000",
                "office": "00 000000"
            }
    },
    {
            "id": "c202",
            "name": "Leonardo Dicaprio",
            "email": "[e-mail]",
            "address": "xx-xx-xxxx,x - street, x - country",
            "gender" : "male",
            "phone": {
                "mobile": "[phone]",
                "home": "00 000000",
                "office": "00 000000"
            }
    },
    {
            "id": "c203",
            "name": "John Wayne",
            "email": "[e-mail]",
            "address": "xx-xx-xxxx,x - street, x - country",
            "gender" : "male",
            "phone": {
                "mobile": "[phone]",
                "home": "00 000000",
                "office": "00 000000"
            }
    },
    {
            "id": "c204",
            "name": "Angelina Jolie",
            "email": "[e-mail]",
            "address": "xx-xx-xxxx,x - street, x - country",
            "gender" : "female",
            "phone": {
                "mobile": "[phone]",
                "home": "00 000000",
                "office": "00 000000"
            }
    },
    {
            "id": "c205",
            "name": "Dido",
            "email": "[e-mail]",
            "address": "xx-xx-xxxx,x - street, x - country",
            "gender" : "female",
            "phone": {
                "mobile": "[phone]",
                "home": "00 000000",
                "office": "00 000000"
            }
    },
    {
            "id": "c206",
            "name": "Adele",
            "email": "[e-mail]",
            "address": "xx-xx-xxxx,x - street, x - country",
            "gender" : "female",
            "phone": {
                "mobile": "[phone]",
                "home": "00 000000",
                "office": "00 000000"
            }
    },
    {
            "id": "c207",
            "name": "Hugh Jackman",
            "email": "[e-mail]",
            "address": "xx-xx-xxxx,x - street, x - country",
            "gender" : "male",
            "phone": {
                "mobile": "[phone]",
                "home": "00 000000",
                "office": "00 000000"
            }
    },
    {
            "id": "c208",
            "name": "Will Smith",
            "email": "[e-mail]",
            "address": "xx-xx-xxxx,x - street, x - country",
            "gender" : "male",
            "phone": {
                "mobile": "[phone]",
                "home": "00 000000",
                "office": "00 000000"
            }
    },
    {
            "id": "c209",
            "name": "Clint Eastwood",
            "email": "[e-mail]",
            "address": "xx-xx-xxxx,x - street, x - country",
            "gender" : "male",
            "phone": {
                "mobile": "[phone]",
                "home": "00 000000",
                "office": "00 000000"
            }
    },
    {
            "id": "c2010",
            "name": "Barack Obama",
            "email": "[e-mail]",
            "address": "xx-xx-xxxx,x - street, x - country",
            "gender" : "male",
            "phone": {
                "mobile": "[phone]",
                "home": "00 000000",
                "office": "00 000000"
            }
    },
    {
            "id": "c2011",
            "name": "Kate Winslet",
            "email": "[e-mail]",
            "address": "xx-xx-xxxx,x - street, x - country",
            "gender" : "female",
            "phone": {
                "mobile": "[phone]",
                "home": "00 000000",
                "office": "00 000000"
            }
    },
    {
            "id": "c2012",
            "name": "Eminem",
            "email": "[e-mail]",
            "address": "xx-xx-xxxx,x - street, x - country",
            "gender" : "male",
            "phone": {
                "mobile": "[phone]",
                "home": "00 000000",
                "office": "00 000000"
            }
    }
]

我实现了自己的接口 ContactAPI.java。

public interface ContactsAPI {
@GET("/contacts/")
public void getContacts(Callback<List<Contact>> response);}

我已经实现了这个模型类，叫做Contact.java。

public class Contact {

@SerializedName("id")
@Expose
private String id;
@SerializedName("name")
@Expose
private String name;
@SerializedName("email")
@Expose
private String email;
@SerializedName("address")
@Expose
private String address;
@SerializedName("gender")
@Expose
private String gender;
public String getId() {return id;}
public void setId(String id) {this.id = id;}
public String getName() {return name;}
public void setName(String name) {this.name = name;}
public String getEmail() {return email;}
public void setEmail(String email) {this.email = email;}
public String getAddress() {return address;}
public void setAddress(String address) {this.address = address;}
public String getGender() {return gender;}
public void setGender(String gender) {this.gender = gender;}}

然后，最终在MainActivity.class中实现了我的RestAdapter。

  public static final String ROOT_URL = "http://api.androidhive.info";
  private ListView listView;
  private List<Contact> contacts;
   RestAdapter adapter = new RestAdapter.Builder().setEndpoint(ROOT_URL).build();
    ContactsAPI api = adapter.create(ContactsAPI.class);

    api.getContacts(new Callback<List<Contact>>() {
        @Override
        public void success(List<Contact> list, Response response) {
            Toast.makeText(MainActivity.this,list.toString(),Toast.LENGTH_SHORT).show();
            showList();
        }

        @Override
        public void failure(RetrofitError error) {
            //you can handle the errors here
            Toast.makeText(MainActivity.this,"Error Occured:"+error.toString(),Toast.LENGTH_SHORT).show();
        }
    });

应用程序运行顺畅，但在4秒延迟后将提示错误，该错误为public void failure(RetrofitError error)，我不知道缺少什么，我检查了我的代码，但找不到任何错误，请帮助我，谢谢。

- user3262438

---

错误信息是什么？ - Juvi

知道错误肯定会有帮助。您在清单文件中是否具有互联网权限？ - Blackbelt

@Juvi - 这是出现在日志中的错误信息 E/Surface: getSlotFromBufferLocked: unknown buffer: 0xaa9ef1b0 - user3262438

@Blackbelt - 是的，我在清单文件中有互联网权限，并且我的错误日志显示 E/Surface: getSlotFromBufferLocked: unknown buffer: 0xaa9ef1b0。 - user3262438

这是一个与Android 6.0有关的已知问题，在6.0.1中已经修复。 - Juvi

Answer 1

如果 JSON 是这样的，你需要一个带有以下内容的类：

public class Contacts {
    @SerializedName("contacts")
    @Expose
    private List<Contact> contacts = new ArrayList<Contact>();

    /**
     *
     * @return
     * The contacts
     */
    public List<Contact> getContacts() {
        return contacts;
    }

    /**
     *
     * @param contacts
     * The contacts
     */
    public void setContacts(List<Contact> contacts) {
        this.contacts = contacts;
    }

}

还有在您的接口 ContactAPI.java 中

public interface ContactsAPI {
    @GET("/contacts/")
    public void getContacts(Callback<Contacts> response);
}

还要检查这个链接，因为“+”出现了问题，这里是error。

- Cabezas

---

谢谢您的回复，但是给我提供的代码yog只给出了一个结果："Contact@824ec91"。我有什么遗漏吗？ - user3262438

好的，现在我明白了，你提供Contacts类的原因是为了为对象提供一个列表，然后我需要使用我的Contact类来调用对象的参数。感谢我的朋友和你，我将开发时间缩短了一半，谢谢！干杯！ - user3262438