改造2 @FormUrl使用空字段编码

Question

I'm sending this:

@FormUrlEncoded
@PUT("Devices/{id}")
Call<Device> updateDeviceSync(
        @Path("id") String id,
        @Field("fieldName1") Integer fieldName1,
        @Field("fieldName2") String fieldName2,
        @Field("fieldName3") String fieldName3);

I'm calling it with:

apiService.updateDeviceSync(deviceId, 0, null, timestamp)

But its only sending fieldName1 and fieldName3

I already have serializeNulls() on my gsonbuilder so it should include nulls in there but logcat shows that its not including fieldName2

I need to update fieldName2 to null in retrofit2

Answer 1

Generally you do not want to send nulls in your API requests. Your server will look for the field and see that it is not there. By not sending the nulls you save on bandwidth and in turn save on data/battery.

Answer 2

Finally made it work, Here are the changes I made:

Updated my api to:

@PUT("Devices/{id}")
Call<Device> updateDeviceCurfewSync(             
    @Path("id") String id,
    @Body HashMap<String, Object> data);

Then called:

HashMap<String, Object> deviceSyncMap = new HashMap<>();
deviceSyncMap.put("fieldName1", 0);
deviceSyncMap.put("fieldName2", null);
deviceSyncMap.put("fieldName3", timestamp);

apiService.updateDeviceCurfewSync(deviceId, deviceSyncMap)