blocks|key|35405|text|使用@Expose注释标记所需的字段，例如：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|35406|@Expose+private+String+id;|code-block|syntax|javascript|35407|省略任何不想序列化的字段。然后用这种方式创建你的Gson对象：|35408|Gson+gson+=+new+GsonBuilder().excludeFieldsWithoutExposeAnnotation().create();|35409|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|$]]

Mark the desired fields with the 
@Expose annotation, such as:

<pre><code>@Expose private String id;
</code></pre>

Leave out any fields that you do not want to serialize. Then just create your Gson object this way:

<pre><code>Gson gson = new GsonBuilder().excludeFieldsWithoutExposeAnnotation().create();
</code></pre>

blocks|key|2502939|text|如果您不想使用new+GsonBuilder().excludeFieldsWithoutExposeAnnotation().create()，我找到了另一个解决方案。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2502940|只是将transient包含在我需要忽略的变量中。|2502941|所以，POJO类终于：|2502942|public+class+sendingPojo+{
++++long+id;
++++String+text1;
++++transient+String+text2;//-->+I+want+to+ignore+that+in+the+JSON

++++getId()+{
++++++++return+id;
++++}

++++setId(long+id)+{
++++++++this.id+=+id;
++++}

++++getText1()+{
++++++++return+text1;
++++}

++++setText1(String+text1)+{
++++++++this.text1+=+text1;
++++}

++++getText2()+{
++++++++return+text2;
++++}

++++setText2(String+text2)+{
++++++++this.text2+=+text2;
++++}
}|code-block|syntax|javascript|2502943|我希望它能帮上忙|2502944|entityMap^0|7|1T|0|3|9|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@$9|T|A|U|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|V|8|@$9|W|A|X|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|Y|8|@]|D|@]|E|$]]|$1|J|3|K|5|L|7|Z|8|@]|D|@]|E|$M|N]]|$1|O|3|P|5|6|7|10|8|@]|D|@]|E|$]]|$1|Q|3|-4|5|6|7|11|8|@]|D|@]|E|$]]]|R|$]]

I found an alternative solution if you don't want to use <code>new GsonBuilder().excludeFieldsWithoutExposeAnnotation().create()</code> . 

Just including <code>transient</code> in the variable I need to ignore.

So, the POJO class finally:

<pre><code>public class sendingPojo {
 long id;
 String text1;
 transient String text2;//--&gt; I want to ignore that in the JSON

 getId() {
 return id;
 }

 setId(long id) {
 this.id = id;
 }

 getText1() {
 return text1;
 }

 setText1(String text1) {
 this.text1 = text1;
 }

 getText2() {
 return text2;
 }

 setText2(String text2) {
 this.text2 = text2;
 }
}
</code></pre>

I hope it helps

blocks|key|2502955|text|您可以通过将GSONBuilder中的GSON对象添加到您的ConverterFactory中来配置Retrofit，请参见下面的示例：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2502956|private+static+UsuarioService+getUsuarioService(String+url)+{
++++return+new+Retrofit.Builder().client(getClient()).baseUrl(url)
++++++++++++.addConverterFactory(GsonConverterFactory.create(getGson())).build()
++++++++++++.create(UsuarioService.class);
}

private+static+OkHttpClient+getClient()+{
++++return+new+OkHttpClient.Builder().connectTimeout(5,+MINUTES).readTimeout(5,+MINUTES)
++++++++++++.build();
}

private+static+Gson+getGson()+{
++++return+new+GsonBuilder().excludeFieldsWithoutExposeAnnotation().create();
}|code-block|syntax|javascript|2502957|要忽略field元素，只需向您的属性添加@Expose(+serialize+=+false，serialize=+false)或none，对于(反)序列化field元素，您可以向属性添加带有空值的@Expose()注释。|2502958|@Entity(indexes+=+{
++++++++@Index(value+=+"id+DESC",+unique+=+true)
})
public+class+Usuario+{

++++@Id(autoincrement+=+true)
++++@Expose(deserialize+=+false,+serialize+=+false)+
++++private+Long+pkey;+//+<-+Ignored+in+JSON
++++private+Long+id;+//+<-+Ignored+in+JSON,+no+@Expose+annotation
++++@Index(unique+=+true)
++++@Expose
++++private+String+guid;+//+<-+Only+this+field+will+be+shown+in+JSON.|2502959|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 configure Retrofit by adding the GSON object from the GSONBuilder into your ConverterFactory, see my example below:

<pre><code>private static UsuarioService getUsuarioService(String url) {
 return new Retrofit.Builder().client(getClient()).baseUrl(url)
 .addConverterFactory(GsonConverterFactory.create(getGson())).build()
 .create(UsuarioService.class);
}

private static OkHttpClient getClient() {
 return new OkHttpClient.Builder().connectTimeout(5, MINUTES).readTimeout(5, MINUTES)
 .build();
}

private static Gson getGson() {
 return new GsonBuilder().excludeFieldsWithoutExposeAnnotation().create();
}
</code></pre>

To ignore the field elements simply add @Expose(deserialize = false, serialize = false) to your properties or none, and for (de)serialize your fields elements you can add the @Expose() annotations with empty values to your properties.

<pre><code>@Entity(indexes = {
 @Index(value = "id DESC", unique = true)
})
public class Usuario {

 @Id(autoincrement = true)
 @Expose(deserialize = false, serialize = false) 
 private Long pkey; // &lt;- Ignored in JSON
 private Long id; // &lt;- Ignored in JSON, no @Expose annotation
 @Index(unique = true)
 @Expose
 private String guid; // &lt;- Only this field will be shown in JSON.
</code></pre>

blocks|key|35742|text|如果你正在使用Kotlin+%2B+Retrofit+%2B+Moshi+(我测试过这个)，在你想有条件地忽略字段的情况下，你可以将它设置为null。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|35743|data+class++User(var+id:+String,++var+name:+string?)

val+user+=+User()
user.id+=+"some+id"
user.name+=+null|code-block|syntax|javascript|35744|生成的Json将是|35745|user{
"id":+"some+id"
}|35746|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|$]]

If you are using Kotlin + Retrofit + Moshi
(I tested this)
In case where you want to conditionally ignore fields, you can set it to null.

<pre><code>data class User(var id: String, var name: string?)

val user = User()
user.id = "some id"
user.name = null
</code></pre>

The Json generated would be 

<pre><code>user{
"id": "some id"
}
</code></pre>

I am developing an Android App which is sending a JSON using Android Retrofit (it converts a POJO class in a JSON). It is working fine, but I need to ignore in the sending of JSON one element from the POJO class. 

Does anyone know any Android Retrofit annotation?

Example

POJO Class:

<pre><code>public class sendingPojo
{
 long id;
 String text1;
 String text2;//--&gt; I want to ignore that in the JSON

 getId(){return id;}
 setId(long id){
 this.id = id;
 }

 getText1(){return text1;}
 setText1(String text1){
 this.text1 = text1;
 }

 getText2(){return text2;}
 setText2(String text2){
 this.text2 = text2;
 }


}
</code></pre>

Interface Sender ApiClass

<pre><code> public interface SvcApi {

 @POST(SENDINGPOJO_SVC_PATH)
 public sendingPojo addsendingPojo(@Body sendingPojo sp);

}
</code></pre>

Any idea how to ignore text2?

How to ignore a JSON element in Android Retrofit

Android

Kotlin

JSON

我正在开发一个Android应用程序，这是发送一个JSON使用Android Retrofit (它转换一个JSON中的POJO类)。它工作得很好，但在发送JSON时需要忽略POJO类中的一个元素。有人知道Android Retrofit注释吗？示例POJO类：public class sendingPojo{   l...

问如何在Android Retrofit中忽略JSON元素
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