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)
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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