Retrofit简单的实例

来源：互联网发布：mac 流程图软件免费编辑：程序博客网时间：2024/05/17 10:54

这篇博客面向的对象是Retrofit新手，如果是老手麻烦帮忙看一下代码时候有可以修改得更好点，谢谢了！

对于新手来说，看一大篇文章之后，急需一个小小的项目来练手，然而网上的例子的代码有点复杂，所以将我自己弄的小例子供新手学习，大家一起互相学习！(直接复制粘贴可用)

0准备工作

Android Stuido中下载插件GsonFormat，因为后面需要生成实体类。

AndroidManifest.xml

 <uses-permission android:name="android.permission.INTERNET" />

app.gradle中加入

compile 'com.squareup.retrofit2:retrofit:2.1.0'compile 'com.squareup.retrofit2:converter-gson:2.1.0'

1项目的框架

2bean

bean里主要放的是接收来的JSON实体对象。使用GsonFormat自动生成的，具体方法度娘一下就出来了。

public class Bean {    /**     * count : 3282     * description : 尾鳍分叉颇深，下叶较长     * disease :     * fcount : 0     * food :     * id : 10     * img : /food/150804/285158e45d996bbd47046ee2af2c7370.jpg     * keywords : 青灰色 银白色 甲壳类 成鱼 菱形     * message : 鲳鱼属于鲈形目，鲳科。体短而高，极侧扁，略呈菱形。头较小，吻圆，口小，牙细。成鱼腹鳍消失。尾鳍分叉颇深，下叶较长。体银白色，上部微呈青灰色。以甲壳类等为食。     * name : 白鲳鱼     * rcount : 0     * status : true     * summary :     * symptom :     * url : http://www.tngou.net/food/show/10     */    private int count;    private String description;    private String disease;    private int fcount;    private String food;    private int id;    private String img;    private String keywords;    private String message;    private String name;    private int rcount;    private boolean status;    private String summary;    private String symptom;    private String url;    public int getCount() {        return count;    }    public void setCount(int count) {        this.count = count;    }    public String getDescription() {        return description;    }    public void setDescription(String description) {        this.description = description;    }    public String getDisease() {        return disease;    }    public void setDisease(String disease) {        this.disease = disease;    }    public int getFcount() {        return fcount;    }    public void setFcount(int fcount) {        this.fcount = fcount;    }    public String getFood() {        return food;    }    public void setFood(String food) {        this.food = food;    }    public int getId() {        return id;    }    public void setId(int id) {        this.id = id;    }    public String getImg() {        return img;    }    public void setImg(String img) {        this.img = img;    }    public String getKeywords() {        return keywords;    }    public void setKeywords(String keywords) {        this.keywords = keywords;    }    public String getMessage() {        return message;    }    public void setMessage(String message) {        this.message = message;    }    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    public int getRcount() {        return rcount;    }    public void setRcount(int rcount) {        this.rcount = rcount;    }    public boolean isStatus() {        return status;    }    public void setStatus(boolean status) {        this.status = status;    }    public String getSummary() {        return summary;    }    public void setSummary(String summary) {        this.summary = summary;    }    public String getSymptom() {        return symptom;    }    public void setSymptom(String symptom) {        this.symptom = symptom;    }    public String getUrl() {        return url;    }    public void setUrl(String url) {        this.url = url;    }}

3retrofit

IBeanService

public interface IBeanService {    @GET("show")    Call<Bean> getMenuById(@Query("id") String id);}

@GET内的参数，是跟在baseURL后面的，所以该URL的具体代码是：

http://www.tngou.net/api/food/ show?id=

Retrofit

public class Retrofit {    private IBeanService service;    /**     * 获取Retrofit实例     * @return     */    public static Retrofit getRetrofit(){        return new Retrofit();    }    private Retrofit() {        retrofit2.Retrofit retrofit = new retrofit2.Retrofit.Builder()                .baseUrl("http://www.tngou.net/api/food/")                .addConverterFactory(GsonConverterFactory.create())                .build();         service = retrofit.create(IBeanService.class);    }    /**     * 获取IBeanService实例     * @return     */    public IBeanService getService(){        return service;    }}

4MainActivity.java

public class MainActivity extends AppCompatActivity implements View.OnClickListener {    private EditText mEditText;    private TextView mTextView;    private Button mButton;    private IBeanService service;    private Retrofit retrofit;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        mEditText = (EditText) findViewById(R.id.et_input);        mTextView = (TextView) findViewById(R.id.tv_2);        mButton = (Button) findViewById(R.id.bt_query);        retrofit=Retrofit.getRetrofit();        service= retrofit.getService();        mButton.setOnClickListener(this);    }    public void onClick(View view) {        switch (view.getId()) {            case R.id.bt_query:                query();                break;        }    }    private void query(){        mTextView.setText("");        String num=mEditText.getText().toString();        if(num.isEmpty()){            Toast.makeText(MainActivity.this, "请输入ID", Toast.LENGTH_SHORT).show();            return;        }        Call<Bean> call = service.getMenuById(num);        call.enqueue(new Callback<Bean>() {            @Override            public void onResponse(Call<Bean> call, Response<Bean> response) {                if (response.isSuccessful()) {                    Bean result = response.body();//关键                    if (result != null) {                        String msg = result.getMessage();                        String name=result.getName();                        mTextView.setText("message="+msg+"name="+name);                    }                }            }            @Override            public void onFailure(Call<Bean> call, Throwable t) {            }        });    }}

5activity_main.xml

    <TextView        android:id="@+id/tv_1"        android:layout_width="wrap_content"        android:layout_height="40dp"        android:text="ID是:"        android:layout_alignParentLeft="true"        android:textColor="#000000"        android:textSize="20sp" />    <EditText        android:layout_width="180dp"        android:layout_height="40dp"        android:layout_toRightOf="@id/tv_1"        android:id="@+id/et_input"/>    <Button        android:layout_width="wrap_content"        android:layout_height="40dp"        android:layout_toRightOf="@id/et_input"        android:id="@+id/bt_query"        android:text="查询"        />    <TextView        android:id="@+id/tv_2"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_below="@id/tv_1"        android:layout_alignLeft="@id/tv_1"        android:layout_marginTop="20dp"        android:textColor="#000000"        android:textSize="15sp" />

大家相互学习，有问题或者建议的，请留言，谢谢了！

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