blocks|key|2490000|text|更好的方法是让Retrofit从json生成POJO+(使用gson)。第一件事是在创建Retrofit实例时添加.addConverterFactory(GsonConverterFactory.create())。例如，如果您有一个与您的json相对应的User+java类(如下所示)，那么您的改进api可能会返回Call<User>|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2490001|class+User+{
++++private+String+id;
++++private+String+Username;
++++private+String+Level;
++++...
}++++|code-block|syntax|javascript|2490002|entityMap^0|U|4|18|8|1L|1F|3L|4|4G|A|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]|$9|P|A|Q|B|C]|$9|R|A|S|B|C]|$9|T|A|U|B|C]|$9|V|A|W|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|X|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Y|8|@]|D|@]|E|$]]]|L|$]]

A better approach is to let Retrofit generate POJO for you from the json (using <code>gson</code>). First thing is to add <code>.addConverterFactory(GsonConverterFactory.create())</code> when creating your <code>Retrofit</code> instance. For example, if you had a <code>User</code> java class (such as shown below) that corresponded to your json, then your retrofit api could return <code>Call&lt;User&gt;</code>

<pre><code>class User {
 private String id;
 private String Username;
 private String Level;
 ...
} 
</code></pre>

blocks|key|29196|text|所以，事情是这样的：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|29197|在制作时|29198|Retrofit+retrofit+=+new+Retrofit.Builder()
++++++++++++++++.baseUrl(Config.BASE_URL)
++++++++++++++++.addConverterFactory(GsonConverterFactory.create())
++++++++++++++++.build();|code-block|syntax|javascript|29199|您将在此处传递GsonConverterFactory.create()。如果你这样做，Gson会自动转换你得到的json对象来响应你的对象<ResponseBody>。在这里你可以传递所有其他的转换器，比如Jackson，等等。|offset|length|style|CODE|29200|entityMap^0|0|0|0|1Y|E|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|R|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|T|8|@$K|U|L|V|M|N]]|9|@]|A|$]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

So, here is the deal:

When making 

<pre><code>Retrofit retrofit = new Retrofit.Builder()
 .baseUrl(Config.BASE_URL)
 .addConverterFactory(GsonConverterFactory.create())
 .build();
</code></pre>

You are passing GsonConverterFactory.create() here. If you do it like this, Gson will automatically convert the json object you get in response to your object <code>&lt;ResponseBody&gt;</code>. Here you can pass all other converters such as Jackson, etc...

blocks|key|30642|text|使用此++将JSON转换为POJO，选择选项如下图所示|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|30643|​|30644|📷|atomic|30645|30646|您将获得一个用于响应的POJO类，如下所示的|30647|public+class+Result+{

++++@SerializedName("id")
++++@Expose
++++private+Integer+id;
++++@SerializedName("Username")
++++@Expose
++++private+String+username;
++++@SerializedName("Level")
++++@Expose
++++private+String+level;

++++/**
++++*+
++++*+@return
++++*+The+id
++++*/
++++public+Integer+getId()+{
++++++++return+id;
++++}

++++/**
++++*+
++++*+@param+id
++++*+The+id
++++*/
++++public+void+setId(Integer+id)+{
++++++++this.id+=+id;
++++}

++++/**
++++*+
++++*+@return
++++*+The+username
++++*/
++++public+String+getUsername()+{
++++++++return+username;
++++}

++++/**
++++*+
++++*+@param+username
++++*+The+Username
++++*/
++++public+void+setUsername(String+username)+{
++++++++this.username+=+username;
++++}

++++/**
++++*+
++++*+@return
++++*+The+level
++++*/
++++public+String+getLevel()+{
++++++++return+level;
++++}

++++/**
++++*+
++++*+@param+level
++++*+The+Level
++++*/
++++public+void+setLevel(String+level)+{
++++++++this.level+=+level;
++++}

}|code-block|syntax|javascript|30648|并使用如下接口：|30649|@FormUrlEncoded
@POST("/api/level")
Call<Result>+checkLevel(@Field("id")+int+id);|30650|并像这样调用：|30651|Call<Result>+call+=+api.checkLevel(1);
call.enqueue(new+Callback<Result>()+{
++++@Override
++++public+void+onResponse(Call<Result>+call,+Response<Result>+response)+{+
+++++if(response.isSuccessful()){
++++++++response.body();+//+have+your+all+data
++++++++int+id+=response.body().getId();
++++++++String+userName+=+response.body().getUsername();
++++++++String+level+=+response.body().getLevel();
++++++++}else+++Toast.makeText(context,response.errorBody().string(),Toast.LENGTH_SHORT).show();+//+this+will+tell+you+why+your+api+doesnt+work+most+of+time

++++}

++++@Override
++++public+void+onFailure(Call<Result>+call,+Throwable+t)+{
+++++Toast.makeText(context,t.toString(),Toast.LENGTH_SHORT).show();+//+ALL+NETWORK+ERROR+HERE

++++}
});|30652|并在Gradle中使用依赖项|30653|compile+'com.squareup.retrofit2:retrofit:2.3.0'
compile+'com.squareup.retrofit2:converter-gson:2.%2B'|30654|注意：该错误是因为您将JSON更改为POJO+(通过在改进中使用addConverterFactory(GsonConverterFactory.create())+)。如果你想要JSON格式的响应，那么从Retrofit中删除addConverterFactory(GsonConverterFactory.create())。如果不是，则使用上面的解决方案|CODE|30655|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/8c595fc02923703899141ab7652b5629.png|imageAlt^0|0|3|5|K|0|0|0|1|0|0|0|0|0|0|8|0|0|0|7|0|0|0|0|0|3|W|1E|36|1E|0^^$0|@$1|2|3|4|5|6|7|1G|8|@$9|1H|A|1I|B|C]|$9|1J|A|1K|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|1L|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|1M|8|@]|D|@$9|1N|A|1O|1|1P]]|E|$]]|$1|K|3|G|5|6|7|1Q|8|@]|D|@]|E|$]]|$1|L|3|M|5|6|7|1R|8|@]|D|@]|E|$]]|$1|N|3|O|5|P|7|1S|8|@]|D|@]|E|$Q|R]]|$1|S|3|T|5|6|7|1T|8|@$9|1U|A|1V|B|C]]|D|@]|E|$]]|$1|U|3|V|5|P|7|1W|8|@]|D|@]|E|$Q|R]]|$1|W|3|X|5|6|7|1X|8|@$9|1Y|A|1Z|B|C]]|D|@]|E|$]]|$1|Y|3|Z|5|P|7|20|8|@]|D|@]|E|$Q|R]]|$1|10|3|11|5|6|7|21|8|@]|D|@]|E|$]]|$1|12|3|13|5|P|7|22|8|@]|D|@]|E|$Q|R]]|$1|14|3|15|5|6|7|23|8|@$9|24|A|25|B|C]|$9|26|A|27|B|16]|$9|28|A|29|B|16]]|D|@]|E|$]]|$1|17|3|-4|5|6|7|2A|8|@]|D|@]|E|$]]]|18|$19|$5|1A|1B|1C|E|$1D|1E|1F|-4]]]]

Use this <a href="http://www.jsonschema2pojo.org/" rel="noreferrer">link</a> to convert your JSON into POJO with select options as selected in image below

<a href="https://i.stack.imgur.com/gKf7x.png" rel="noreferrer"><img src="https://i.stack.imgur.com/gKf7x.png" alt="enter image description here"></a>

You will get a POJO class for your response like this

<pre><code>public class Result {

 @SerializedName("id")
 @Expose
 private Integer id;
 @SerializedName("Username")
 @Expose
 private String username;
 @SerializedName("Level")
 @Expose
 private String level;

 /**
 * 
 * @return
 * The id
 */
 public Integer getId() {
 return id;
 }

 /**
 * 
 * @param id
 * The id
 */
 public void setId(Integer id) {
 this.id = id;
 }

 /**
 * 
 * @return
 * The username
 */
 public String getUsername() {
 return username;
 }

 /**
 * 
 * @param username
 * The Username
 */
 public void setUsername(String username) {
 this.username = username;
 }

 /**
 * 
 * @return
 * The level
 */
 public String getLevel() {
 return level;
 }

 /**
 * 
 * @param level
 * The Level
 */
 public void setLevel(String level) {
 this.level = level;
 }

}
</code></pre>

and use interface like this:

<pre><code>@FormUrlEncoded
@POST("/api/level")
Call&lt;Result&gt; checkLevel(@Field("id") int id);
</code></pre>

and call like this:

<pre><code>Call&lt;Result&gt; call = api.checkLevel(1);
call.enqueue(new Callback&lt;Result&gt;() {
 @Override
 public void onResponse(Call&lt;Result&gt; call, Response&lt;Result&gt; response) { 
 if(response.isSuccessful()){
 response.body(); // have your all data
 int id =response.body().getId();
 String userName = response.body().getUsername();
 String level = response.body().getLevel();
 }else Toast.makeText(context,response.errorBody().string(),Toast.LENGTH_SHORT).show(); // this will tell you why your api doesnt work most of time

 }

 @Override
 public void onFailure(Call&lt;Result&gt; call, Throwable t) {
 Toast.makeText(context,t.toString(),Toast.LENGTH_SHORT).show(); // ALL NETWORK ERROR HERE

 }
});
</code></pre>

and use dependencies in Gradle 

<pre><code>compile 'com.squareup.retrofit2:retrofit:2.3.0'
compile 'com.squareup.retrofit2:converter-gson:2.+'
</code></pre>

NOTE: The error occurs because you changed your JSON into POJO (by use of <code>addConverterFactory(GsonConverterFactory.create())</code> in retrofit). If you want response in JSON then remove the <code>addConverterFactory(GsonConverterFactory.create())</code> from Retrofit. If not then use the above solution

blocks|key|29219|text|使用它来获取字符串|type|unstyled|depth|inlineStyleRanges|entityRanges|data|29220|String+res+=+response.body().string();|code-block|syntax|javascript|29221|而不是|29222|String+res+=+response.body().toString();|29223|并在将responsebody转换为字符串之前始终保持对null的检查|29224|if(response.body()+!=+null){
+++++//do+your+stuff+++
}|29225|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|U|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

use this to get String 

<pre><code>String res = response.body().string();
</code></pre>

instead of

<pre><code>String res = response.body().toString();
</code></pre>

and always keep a check for null before converting responsebody to string

<pre><code>if(response.body() != null){
 //do your stuff 
}
</code></pre>

blocks|key|2700460|text|使用这个|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2700461|response.body().get(0).getUsername().toString();|code-block|syntax|javascript|2700462|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

use this

<pre><code>response.body().get(0).getUsername().toString();
</code></pre>

blocks|key|29238|text|为retrofit2添加依赖项|type|unstyled|depth|inlineStyleRanges|entityRanges|data|29239|compile+'com.google.code.gson:gson:2.6.2'
compile+'com.squareup.retrofit2:retrofit:2.0.2'
compile+'com.squareup.retrofit2:converter-gson:2.0.2'|code-block|syntax|javascript|29240|为基本url创建类|29241|public+class+ApiClient+++++
{
public+static+final+String+BASE_URL+=+"base_url";

private+static+Retrofit+retrofit+=+null;

public+static+Retrofit+getClient()+{
++++if+(retrofit==null)+{
++++++++retrofit+=+new+Retrofit.Builder()
++++++++++++++++.baseUrl(BASE_URL)
++++++++++++++++.addConverterFactory(GsonConverterFactory.create())
++++++++++++++++.build();
++++}
++++return+retrofit;
}

}|29242|然后创建类模型以获取值|29243|public+class+ApprovalModel+{

@SerializedName("key_parameter")
private+String+approvalName;
public+String+getApprovalName()+{
++++return+approvalName;
}
}|29244|创建接口类|29245|public+interface+ApiInterface+{+
@GET("append_url")
Call<CompanyDetailsResponse>+getCompanyDetails();
}|29246|之后，在main类中|29247|+if(Connectivity.isConnected(mContext)){
++++++++++++final+ProgressDialog+mProgressDialog+=+new+ProgressDialog(mContext);
++++++++++++mProgressDialog.setIndeterminate(true);
++++++++++++mProgressDialog.setMessage("Loading...");
++++++++++++mProgressDialog.show();

++++++++++++ApiInterface+apiService+=
++++++++++++++++++++ApiClient.getClient().create(ApiInterface.class);

++++++++++++Call<CompanyDetailsResponse>+call+=+apiService.getCompanyDetails();
++++++++++++call.enqueue(new+Callback<CompanyDetailsResponse>()+{
++++++++++++++++@Override
++++++++++++++++public+void+onResponse(Call<CompanyDetailsResponse>call,+Response<CompanyDetailsResponse>+response)+{
++++++++++++++++++++mProgressDialog.dismiss();
++++++++++++++++++++if(response!=null+&&+response.isSuccessful())+{
++++++++++++++++++++++++List<CompanyDetails>+companyList+=+response.body().getCompanyDetailsList();

++++++++++++++++++++++++if+(companyList+!=+null&&companyList.size()>0)+{
++++++++++++++++++++++++++++for+(int+i+=+0;+i+<+companyList.size();+i%2B%2B)+{
++++++++++++++++++++++++++++++++Log.d(TAG,+""+%2B+companyList.get(i));
++++++++++++++++++++++++++++}
+++++++++++++++++++++++++//get+values
++++++++++++++++++++++++}else{
++++++++++++++++++++++++++++//show+alert+not+get+value
++++++++++++++++++++++++}
++++++++++++++++++++}else{
++++++++++++++++++++++++//show+error+message

++++++++++++++++++++}
++++++++++++++++}

++++++++++++++++@Override
++++++++++++++++public+void+onFailure(Call<CompanyDetailsResponse>call,+Throwable+t)+{
++++++++++++++++++++//+Log+error+here+since+request+failed
++++++++++++++++++++Log.e(TAG,+t.toString());
++++++++++++++++++++mProgressDialog.dismiss();
++++++++++++++++}
++++++++++++});
++++++++}else{
++++++++++++//network+error+alert+box

++++++++}|29248|entityMap^0|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|Z|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|10|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|11|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|12|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|13|8|@]|9|@]|A|$E|F]]|$1|O|3|P|5|6|7|14|8|@]|9|@]|A|$]]|$1|Q|3|R|5|D|7|15|8|@]|9|@]|A|$E|F]]|$1|S|3|T|5|6|7|16|8|@]|9|@]|A|$]]|$1|U|3|V|5|D|7|17|8|@]|9|@]|A|$E|F]]|$1|W|3|-4|5|6|7|18|8|@]|9|@]|A|$]]]|X|$]]

add dependency for retrofit2 

<pre><code>compile 'com.google.code.gson:gson:2.6.2'
compile 'com.squareup.retrofit2:retrofit:2.0.2'
compile 'com.squareup.retrofit2:converter-gson:2.0.2'
</code></pre>

create class for base url

<pre><code>public class ApiClient 
{
public static final String BASE_URL = "base_url";

private static Retrofit retrofit = null;

public static Retrofit getClient() {
 if (retrofit==null) {
 retrofit = new Retrofit.Builder()
 .baseUrl(BASE_URL)
 .addConverterFactory(GsonConverterFactory.create())
 .build();
 }
 return retrofit;
}

}
</code></pre>

after that create class model to get value

<pre><code>public class ApprovalModel {

@SerializedName("key_parameter")
private String approvalName;
public String getApprovalName() {
 return approvalName;
}
}
</code></pre>

create interface class

<pre><code>public interface ApiInterface { 
@GET("append_url")
Call&lt;CompanyDetailsResponse&gt; getCompanyDetails();
}
</code></pre>

after that in main class

<pre><code> if(Connectivity.isConnected(mContext)){
 final ProgressDialog mProgressDialog = new ProgressDialog(mContext);
 mProgressDialog.setIndeterminate(true);
 mProgressDialog.setMessage("Loading...");
 mProgressDialog.show();

 ApiInterface apiService =
 ApiClient.getClient().create(ApiInterface.class);

 Call&lt;CompanyDetailsResponse&gt; call = apiService.getCompanyDetails();
 call.enqueue(new Callback&lt;CompanyDetailsResponse&gt;() {
 @Override
 public void onResponse(Call&lt;CompanyDetailsResponse&gt;call, Response&lt;CompanyDetailsResponse&gt; response) {
 mProgressDialog.dismiss();
 if(response!=null &amp;&amp; response.isSuccessful()) {
 List&lt;CompanyDetails&gt; companyList = response.body().getCompanyDetailsList();

 if (companyList != null&amp;&amp;companyList.size()&gt;0) {
 for (int i = 0; i &lt; companyList.size(); i++) {
 Log.d(TAG, "" + companyList.get(i));
 }
 //get values
 }else{
 //show alert not get value
 }
 }else{
 //show error message

 }
 }

 @Override
 public void onFailure(Call&lt;CompanyDetailsResponse&gt;call, Throwable t) {
 // Log error here since request failed
 Log.e(TAG, t.toString());
 mProgressDialog.dismiss();
 }
 });
 }else{
 //network error alert box

 }
</code></pre>

blocks|key|29485|text|如果你想得到JSON格式的完整响应，试试这个：|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|29486|我尝试了一种新方法，可以在不创建任何模型类的情况下，以JSON格式从服务器获取整个响应。我没有使用任何模型类从服务器获取数据，因为我不知道我会得到什么响应，或者它可能会根据需求而变化。|29487|这是JSON响应：|29488|{"contacts":+[
++++{
++++++++"id":+"c200",
++++++++"name":+"sunil",
++++++++"email":+"email@gmail.com",
++++++++"address":+"xx-xx-xxxx,x+-+street,+x+-+country",
++++++++"gender"+:+"male",
++++++++"phone":+{
++++++++++++"mobile":+"%2B91+0000000000",
++++++++++++"home":+"00+000000",
++++++++++++"office":+"00+000000"
++++++++}
++++},
++++{
++++++++"id":+"c201",
++++++++"name":+"Johnny+Depp",
++++++++"email":+"johnny_depp@gmail.com",
++++++++"address":+"xx-xx-xxxx,x+-+street,+x+-+country",
++++++++"gender"+:+"male",
++++++++"phone":+{
++++++++++++"mobile":+"%2B91+0000000000",
++++++++++++"home":+"00+000000",
++++++++++++"office":+"00+000000"
++++++++}
++++},
++++.
++++.
++++.
]}|code-block|syntax|javascript|29489|API接口中的|29490|更改参数|ordered-list-item|29491|29492|公共接口登录{@POST(“/index.php/User/+ApiInterface”)//您的接口链接@FormUrlEncoded调用getmovies(@Field("user_email_address")+String+title，@Field("user_password")+String+body)；}在您的主活动中调用|29493|unordered-list-item|29494|29495|ApiInterface+call+apiService+=+ApiClient.getClient().create(ApiInterface.class)；Call+call=+apiService.getmovies("a@gmail.com"，"123456")；call.enqueue(call.enqueue(){+@Override+public+void+onResponse(Call+call，Response+response)+{+Log.e("TAG"，"response+33：“%2BApiInterface+Gson().toJson(response.body(+)；}+@Override+public+void+onFailure(Call+call，Throwable+t)+{+Log.e("TAG"，"onFailure："%2Bt.toString()+)；//请求失败导致此处记录错误}})；|29496|之后可以正常使用JSON对象和JSON数组|29497|
获取参数|29498|输出|29499|📷|atomic|29500|​|29501|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/2624f28a1c0b5662ecc9191fa7ee8338.png|imageAlt^0|0|N|0|18|E|0|0|9|0|0|0|0|0|0|0|0|0|0|0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|1L|8|@$9|1M|A|1N|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|1O|8|@$9|1P|A|1Q|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|1R|8|@$9|1S|A|1T|B|C]]|D|@]|E|$]]|$1|J|3|K|5|L|7|1U|8|@]|D|@]|E|$M|N]]|$1|O|3|P|5|6|7|1V|8|@]|D|@]|E|$]]|$1|Q|3|R|5|S|7|1W|8|@]|D|@]|E|$]]|$1|T|3|-4|5|6|7|1X|8|@]|D|@]|E|$]]|$1|U|3|V|5|6|7|1Y|8|@]|D|@]|E|$]]|$1|W|3|-4|5|X|7|1Z|8|@]|D|@]|E|$]]|$1|Y|3|-4|5|6|7|20|8|@]|D|@]|E|$]]|$1|Z|3|10|5|6|7|21|8|@]|D|@]|E|$]]|$1|11|3|12|5|X|7|22|8|@]|D|@]|E|$]]|$1|13|3|14|5|6|7|23|8|@]|D|@]|E|$]]|$1|15|3|16|5|6|7|24|8|@]|D|@]|E|$]]|$1|17|3|18|5|19|7|25|8|@]|D|@$9|26|A|27|1|28]]|E|$]]|$1|1A|3|1B|5|6|7|29|8|@]|D|@]|E|$]]|$1|1C|3|-4|5|6|7|2A|8|@]|D|@]|E|$]]]|1D|$1E|$5|1F|1G|1H|E|$1I|1J|1K|-4]]]]

If you want to get whole response in JSON format, try this:

I have tried a new way to get whole response from server in JSON format without creating any model class. I am not using any model class to get data from server because I don't know what response I will get or it may change according to requirements.

this is JSON response:

<pre><code>{"contacts": [
 {
 "id": "c200",
 "name": "sunil",
 "email": "email@gmail.com",
 "address": "xx-xx-xxxx,x - street, x - country",
 "gender" : "male",
 "phone": {
 "mobile": "+91 0000000000",
 "home": "00 000000",
 "office": "00 000000"
 }
 },
 {
 "id": "c201",
 "name": "Johnny Depp",
 "email": "johnny_depp@gmail.com",
 "address": "xx-xx-xxxx,x - street, x - country",
 "gender" : "male",
 "phone": {
 "mobile": "+91 0000000000",
 "home": "00 000000",
 "office": "00 000000"
 }
 },
 .
 .
 .
]}
</code></pre>

<ol>
<li>In your API interface change the parameter

<pre><code>public interface ApiInterface {
@POST("/index.php/User/login")//your api link 
@FormUrlEncoded
Call&lt;Object&gt; getmovies(@Field("user_email_address") String title,
 @Field("user_password") String body);
}
</code></pre></li>
<li>in your main activity where you are calling this

<pre><code>ApiInterface apiService =
 ApiClient.getClient().create(ApiInterface.class);

Call call = apiService.getmovies("a@gmail.com","123456");
call.enqueue(new Callback() {
 @Override
 public void onResponse(Call call, Response response) {
 Log.e("TAG", "response 33: "+new Gson().toJson(response.body()) );
 }

 @Override
 public void onFailure(Call call, Throwable t) {
 Log.e("TAG", "onFailure: "+t.toString() );
 // Log error here since request failed
 }
});
</code></pre></li>
<li>after that you can normally get parameter using JSON object and JSON array</li>
</ol>

Output
<a href="https://i.stack.imgur.com/Dd17S.png" rel="noreferrer"><img src="https://i.stack.imgur.com/Dd17S.png" alt="enter image description here"></a>

blocks|key|2490251|text|如果您不知道API的响应可能是什么。按照以下步骤将responsebody响应值转换为字节并以字符串格式打印，您可以在控制台中打印整个响应。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2490252|然后，您可以轻松地将字符串转换为JSONObject。|2490253|++++++apiService.getFeeds(headerMap,+map).enqueue(object+:+Callback,+retrofit2.Callback<ResponseBody>+{
++++++++++++override+fun+onFailure(call:+Call<ResponseBody>?,+t:+Throwable?)+{
++++++++++++}

++++++++++++override+fun+onResponse(call:+Call<ResponseBody>?,+response:+Response<ResponseBody>?)+{
++++++++++++++++val+bytes+=+(response!!.body()!!.bytes())
++++++++++++++++Log.d("Retrofit+Success+:+",+""%2B+String(bytes))
++++++++++++}
++++++++})|code-block|syntax|javascript|2490254|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

If you don't have idea about What could be the response from the API. Follow the steps to convert the responsebody response value into bytes and print in the String format You can get the entire response printed in the console. 

Then you can convert string to JSONObject easily.

<pre><code> apiService.getFeeds(headerMap, map).enqueue(object : Callback, retrofit2.Callback&lt;ResponseBody&gt; {
 override fun onFailure(call: Call&lt;ResponseBody&gt;?, t: Throwable?) {
 }

 override fun onResponse(call: Call&lt;ResponseBody&gt;?, response: Response&lt;ResponseBody&gt;?) {
 val bytes = (response!!.body()!!.bytes())
 Log.d("Retrofit Success : ", ""+ String(bytes))
 }
 })
</code></pre>

blocks|key|2700614|text|你可以这样使用它。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2700615|+public+void+onResponse(Call<JsonObject>+call,+Response<JsonObject>+response)+{
++++++++++++if+(response.isSuccessful())+{
++++++++++++++++try+{
++++++++++++++++++++JSONObject+jsonObject+=+new+JSONObject(new+Gson().toJson(response.body()));
++++++++++++++++++++msg+=+jsonObject.getString("msg");
++++++++++++++++++++status+=+jsonObject.getBoolean("status");

++++++++++++++++++++msg+=+jsonObject.getString("msg");
++++++++++++++++++++status+=+jsonObject.getBoolean("status");
++++++++++++++++}+catch+(JSONException+e)+{
++++++++++++++++++++e.printStackTrace();
++++++++++++++++}

++++++++++++++++Toast.makeText(MainActivity.this,+msg,+Toast.LENGTH_SHORT).show();
++++++++++++++++Log.e("cvbnop",response.body().toString());
++++++++++++}+else+{
++++++++++++++++Toast.makeText(MainActivity.this,+"Some+error+occurred...",+Toast.LENGTH_LONG).show();
++++++++++++}
++++++++}|code-block|syntax|javascript|2700616|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

You can use it like this.

<pre><code> public void onResponse(Call&lt;JsonObject&gt; call, Response&lt;JsonObject&gt; response) {
 if (response.isSuccessful()) {
 try {
 JSONObject jsonObject = new JSONObject(new Gson().toJson(response.body()));
 msg = jsonObject.getString("msg");
 status = jsonObject.getBoolean("status");

 msg = jsonObject.getString("msg");
 status = jsonObject.getBoolean("status");
 } catch (JSONException e) {
 e.printStackTrace();
 }

 Toast.makeText(MainActivity.this, msg, Toast.LENGTH_SHORT).show();
 Log.e("cvbnop",response.body().toString());
 } else {
 Toast.makeText(MainActivity.this, "Some error occurred...", Toast.LENGTH_LONG).show();
 }
 }
</code></pre>

blocks|key|2700631|text|我发现其他答案的组合是有效的：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2700632|interface+ApiInterface+{
++++@GET("/someurl")
++++Call<ResponseBody>+getdata()
}

apiService.getdata().enqueue(object+:+Callback+{
++++override+fun+onResponse(call:+Call,+response:+Response)+{
++++++++val+rawJsonString+=+response.body()?.string()
++++}
})|code-block|syntax|javascript|2700633|重要的部分是响应类型应该是ResponseBody，并使用response.body()?.string()来获取原始字符串。|offset|length|style|CODE|2700634|https://stackoverflow.com/a/33286112/860488|2700635|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|D|C|T|P|0|0|17|0|0^^$0|@$1|2|3|4|5|6|7|V|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|W|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|X|8|@$I|Y|J|Z|K|L]|$I|10|J|11|K|L]]|9|@]|A|$]]|$1|M|3|N|5|6|7|12|8|@]|9|@$I|13|J|14|1|15]]|A|$]]|$1|O|3|-4|5|6|7|16|8|@]|9|@]|A|$]]]|P|$Q|$5|R|S|T|A|$U|N]]]]

I found that a combination of the other answers works:

<pre><code>interface ApiInterface {
 @GET("/someurl")
 Call&lt;ResponseBody&gt; getdata()
}

apiService.getdata().enqueue(object : Callback {
 override fun onResponse(call: Call, response: Response) {
 val rawJsonString = response.body()?.string()
 }
})
</code></pre>

The important part are that the response type should be <code>ResponseBody</code> and use <code>response.body()?.string()</code> to get the raw string.

<a href="https://stackoverflow.com/a/33286112/860488">https://stackoverflow.com/a/33286112/860488</a>

blocks|key|2700714|text|如果您需要json字符串响应，您可以使用下面给出的代码更改您的接口。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2700715|@FormUrlEncoded
@POST("/api/level")
Call<JsonObject>+checkLevel(@Field("id")+int+id);++|code-block|syntax|javascript|2700716|此的和改装功能|offset|length|style|BOLD|2700717|Call<JsonObject>+call+=+api.checkLevel(1);
++++call.enqueue(new+Callback<JsonObject>()+{
++++++++@Override
++++++++public+void+onResponse(Call<JsonObject>+call,+Response<JsonObject>+response)+{
++++++++++++Log.d("res",+response.body().toString());
++++++++}

++++++++@Override
++++++++public+void+onFailure(Call<JsonObject>+call,+Throwable+t)+{
++++++++++++Log.d("error",t.getMessage());
++++++++}
++++});|2700718|entityMap^0|0|0|2|5|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@$I|T|J|U|K|L]]|9|@]|A|$]]|$1|M|3|N|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

you can change your interface with code given below, if you need json String response..

<pre><code>@FormUrlEncoded
@POST("/api/level")
Call&lt;JsonObject&gt; checkLevel(@Field("id") int id); 
</code></pre>

and retrofit function with this

<pre><code>Call&lt;JsonObject&gt; call = api.checkLevel(1);
 call.enqueue(new Callback&lt;JsonObject&gt;() {
 @Override
 public void onResponse(Call&lt;JsonObject&gt; call, Response&lt;JsonObject&gt; response) {
 Log.d("res", response.body().toString());
 }

 @Override
 public void onFailure(Call&lt;JsonObject&gt; call, Throwable t) {
 Log.d("error",t.getMessage());
 }
 });
</code></pre>

blocks|key|29588|text|try+{+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
++++JSONObject+jsonObject+=+new+JSONObject(response.body().string());+++++++++++
++++System.out.println(jsonObject);+++++++++++++++++++++++++++++++++++++++++++++
}+catch+(JSONException+%7C+IOException+e+)+{++++++++++++++++++++++++++++++++++++++
++++e.printStackTrace();++++++++++++++++++++++++++++++++++++++++++++++++++++++++
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|29589|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>try { 
 JSONObject jsonObject = new JSONObject(response.body().string()); 
 System.out.println(jsonObject); 
} catch (JSONException | IOException e ) { 
 e.printStackTrace(); 
}
</code></pre>

blocks|key|2700784|text|你可以像下面这样的用户……|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2700785|2700786|Api接口|ordered-list-item|2700787|2700788|公共接口Api+{+@POST("app-api/user-login")调用doLogin(+@Body+RegistrationModel+userModel)；}|2700789|2700790|ApiService|2700791|2700792|公共类ApiService+{+Gson+gson+=+.addConverterFactory(GsonConverterFactory.create(gson))+GsonBuilder()+.setLenient()+.create()；公共静态最终字符串BASE_URL+=“您的接口url"；api+Api+=新的Retrofit.Builder()+.baseUrl(BASE_URL)+api+.build().create()Api.class；公共调用模型(RegistrationModel+DoLogin){RegistrationModel+api.doLogin(模型)；}+}|2700793|2700794|请求模型|2700795|2700796|公共类RegistrationModel+{+String+fullName=""；String+eamil=""；String+phone=""；String+password=""；int+id+=+0；//getter+or+setter+}|2700797|2700798|响应模型|2700799|2700800|公有类RegistrationResponseModel+{私有字符串outMessage；私有字符串outCode；//getter+setter+}|2700801|2700802|呼叫活动|2700803|2700804|private+void+doLogin(){+ApiService+apiService+=新的ApiService()；RegistrationModel模型=新的RegistrationModel()；model.setPhone("0192144444")；model.setPassword("123")；model.setId(3)；Call+call+=apiService.doLogin(模型)；call.enqueue(new+Callback()+{+@Override+public+void+onResponse(Call+call，response)+{}+@Override+public+void+onFailure(Call+call，Throwable+t)+{}+})；}|2700805|2700806|别忘了添加下面的库|2700807|2700808|'com.squareup.retrofit2:converter-scalars:2.3.0'：2.5.0‘implementation’com.squareup.replit2:converter-gson:2.3.0‘implementation|2700809|2700810|添加工具:替换application.Manifest文件下的清单文件，如下所示..|2700811|2700812|尽情享受吧。|2700813|entityMap^0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|1K|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|1L|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|1M|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|1N|8|@]|9|@]|A|$]]|$1|G|3|H|5|6|7|1O|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|1P|8|@]|9|@]|A|$]]|$1|J|3|K|5|E|7|1Q|8|@]|9|@]|A|$]]|$1|L|3|-4|5|6|7|1R|8|@]|9|@]|A|$]]|$1|M|3|N|5|6|7|1S|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|1T|8|@]|9|@]|A|$]]|$1|P|3|Q|5|E|7|1U|8|@]|9|@]|A|$]]|$1|R|3|-4|5|6|7|1V|8|@]|9|@]|A|$]]|$1|S|3|T|5|6|7|1W|8|@]|9|@]|A|$]]|$1|U|3|-4|5|6|7|1X|8|@]|9|@]|A|$]]|$1|V|3|W|5|E|7|1Y|8|@]|9|@]|A|$]]|$1|X|3|-4|5|6|7|1Z|8|@]|9|@]|A|$]]|$1|Y|3|Z|5|6|7|20|8|@]|9|@]|A|$]]|$1|10|3|-4|5|6|7|21|8|@]|9|@]|A|$]]|$1|11|3|12|5|E|7|22|8|@]|9|@]|A|$]]|$1|13|3|-4|5|6|7|23|8|@]|9|@]|A|$]]|$1|14|3|15|5|6|7|24|8|@]|9|@]|A|$]]|$1|16|3|-4|5|6|7|25|8|@]|9|@]|A|$]]|$1|17|3|18|5|E|7|26|8|@]|9|@]|A|$]]|$1|19|3|-4|5|6|7|27|8|@]|9|@]|A|$]]|$1|1A|3|1B|5|6|7|28|8|@]|9|@]|A|$]]|$1|1C|3|-4|5|6|7|29|8|@]|9|@]|A|$]]|$1|1D|3|1E|5|E|7|2A|8|@]|9|@]|A|$]]|$1|1F|3|-4|5|6|7|2B|8|@]|9|@]|A|$]]|$1|1G|3|1H|5|6|7|2C|8|@]|9|@]|A|$]]|$1|1I|3|-4|5|6|7|2D|8|@]|9|@]|A|$]]]|1J|$]]

Yo can user like bellow...
<ol>
<li>Api Interface
<pre><code>public interface Api {

 @POST(&quot;app-api/user-login&quot;)
 Call&lt;RegistrationResponseModel&gt; doLogin( @Body RegistrationModel userModel);

}
</code></pre>
</li>
<li>ApiService
<pre><code>public class ApiService {

 Gson gson = new GsonBuilder()
 .setLenient()
 .create();

 public static final String BASE_URL = &quot;your api url&quot;;

 Api api = new Retrofit.Builder()
 .baseUrl(BASE_URL)
 .addConverterFactory(GsonConverterFactory.create(gson)) 
 .build().create(Api.class);



 public Call&lt;RegistrationResponseModel&gt; doLogin(RegistrationModel model) {
 return api.doLogin(model);
 }
}
</code></pre>
</li>
<li>Request Model
<pre><code>public class RegistrationModel {
 String fullName=&quot;&quot;;
 String eamil=&quot;&quot;;
 String phone=&quot;&quot;;
 String password=&quot;&quot;;
 int id = 0;
 //getter or setter
 }
</code></pre>
</li>
<li>Response model
<pre><code> public class RegistrationResponseModel {
 private String outMessage;
 private String outCode;
 //getter setter
 }
</code></pre>
</li>
<li>call activity
<pre><code> private void doLogin(){

 ApiService apiService = new ApiService();
 RegistrationModel model = new RegistrationModel();

 model.setPhone(&quot;0192144444&quot;);
 model.setPassword(&quot;123&quot;);
 model.setId(3);

 Call&lt;RegistrationResponseModel&gt; call = apiService.doLogin(model);
 call.enqueue(new Callback&lt;RegistrationResponseModel&gt;() {
 @Override
 public void onResponse(Call&lt;RegistrationResponseModel&gt; call, Response&lt;RegistrationResponseModel&gt; response) {

 }

 @Override
 public void onFailure(Call&lt;RegistrationResponseModel&gt; call, Throwable t) {

 }
 });
 }
</code></pre>
</li>
<li>Don't forget to add bellow library
<pre><code>implementation 'com.squareup.retrofit2:retrofit:2.5.0'
implementation 'com.squareup.retrofit2:converter-gson:2.3.0'
implementation 'com.squareup.retrofit2:converter-scalars:2.3.0'
</code></pre>
</li>
<li>Add tools:replace in manifest file under application.Manifest file look like..
<pre><code> &lt;?xml version=&quot;1.0&quot; encoding=&quot;utf-8&quot;?&gt;
&lt;manifest xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot;
 xmlns:tools=&quot;http://schemas.android.com/tools&quot;
 package=&quot;your package&quot;&gt;

 &lt;uses-permission android:name=&quot;android.permission.INTERNET&quot; /&gt;

 &lt;application
 ......
 tools:replace=&quot;android:icon&quot; &gt;

 &lt;/application&gt;

&lt;/manifest&gt;
</code></pre>
</li>
</ol>
Enjoy it...

blocks|key|29411|text|你可以从原始对象得到json响应，就像你从api得到ResponseBody一样。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|29412|Call<ResponseBody>|code-block|syntax|javascript|29413|和内部回调，你可以得到你的json响应|29414|json+=+response.raw().toString();|29415|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

you can get json response from raw object
as you do you get ResponseBody From api
<pre><code>Call&lt;ResponseBody&gt;
</code></pre>
and inside call back you can get your json response
<pre><code>json = response.raw().toString();
</code></pre>

I want to get string json from my api using retrofit 2, I have no problem when using retrofit 1 to get this json but using retrofit 2 returns null for me.

This is what my json looks like

<pre><code>{"id":1,"Username":"admin","Level":"Administrator"}
</code></pre>

This is my API

<pre><code>@FormUrlEncoded
@POST("/api/level")
Call&lt;ResponseBody&gt; checkLevel(@Field("id") int id);
</code></pre>

This is how my code looks like

<pre><code>Retrofit retrofit = new Retrofit.Builder()
 .baseUrl(Config.BASE_URL)
 .addConverterFactory(GsonConverterFactory.create())
 .build();
 Api api = retrofit.create(Api.class);
 Call&lt;ResponseBody&gt; call = api.checkLevel(1);
 call.enqueue(new Callback&lt;ResponseBody&gt;() {
 @Override
 public void onResponse(Call&lt;ResponseBody&gt; call, Response&lt;ResponseBody&gt; response) {
 JsonObject post = new JsonObject().get(response.body().toString()).getAsJsonObject();
 if (post.get("Level").getAsString().contains("Administrator")) {

 }
 }

 @Override
 public void onFailure(Call&lt;ResponseBody&gt; call, Throwable t) {
 }
 });
</code></pre>

I'm new to retrofit 2 and using above code, it always make my apps crash because <code>response.body().toString()</code> returns null.

Please guide me on how to get that json string so I can convert it into JsonObject.

Retrofit 2: Get JSON from Response body

服务器

JSON

我想使用retrofit 2从我的api中获得string json，当我使用retrofit 1获得这个json时没有问题，但是使用retrofit 2为我返回null。这是我的json的样子。{"id":1,"Username":"admin","Level":"Administrator"}这是我的API@For...

问改进2:从响应体获取JSON
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