处理 Empty Json Object to null，no Property Jsonobject to null

Readme.md

用法

new GsonBuilder()  
            .registerTypeAdapterFactory(
                new EmptyCheckTypeAdapterFactory())
            .create();

thinks: chrisjenx

EmptyCheckTypeAdapterFactory.java

package com.ibeilly.utils.gson;


import android.os.Parcelable;

import com.google.gson.Gson;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.TypeAdapter;
import com.google.gson.TypeAdapterFactory;
import com.google.gson.reflect.TypeToken;
import com.google.gson.stream.JsonReader;
import com.google.gson.stream.JsonWriter;

import java.io.IOException;

/**
 * @author shibl
 * @date 2018/5/4
 **/
public class EmptyCheckTypeAdapterFactory implements TypeAdapterFactory {

    @Override public <T> TypeAdapter<T> create(final Gson gson, final TypeToken<T> type) {
        // We filter out the EmptyCheckTypeAdapter as we need to check this for emptiness!
        if (Parcelable.class.isAssignableFrom(type.getRawType())) {
            final TypeAdapter<T> delegate = gson.getDelegateAdapter(this, type);
            final TypeAdapter<JsonElement> elementAdapter = gson.getAdapter(JsonElement.class);
            return new EmptyCheckTypeAdapter<>(delegate, elementAdapter).nullSafe();
        }
        return null;
    }

    public static class EmptyCheckTypeAdapter<T> extends TypeAdapter<T> {

        private final TypeAdapter<T> delegate;
        private final TypeAdapter<JsonElement> elementAdapter;

        public EmptyCheckTypeAdapter(final TypeAdapter<T> delegate,
                                     final TypeAdapter<JsonElement> elementAdapter) {
            this.delegate = delegate;
            this.elementAdapter = elementAdapter;
        }

        @Override public void write(final JsonWriter out, final T value) throws IOException {
            this.delegate.write(out, value);
        }

        @Override public T read(final JsonReader in) throws IOException {
            final JsonObject asJsonObject = elementAdapter.read(in).getAsJsonObject();
            if (asJsonObject.entrySet().isEmpty()) return null;
            return this.delegate.fromJsonTree(asJsonObject);
        }
    }

}

thinks http://chrisjenx.com/gson-empty-json-object-to-null/