gson java.lang.NumberFormatExcep

标题：

gson 序列化model 闪退

错误信息：

java.lang.NumberFormatException: empty String

错误原因：

类型不统一，gson 后台 string 转 int时，“” 导致崩溃
eg:

{
   "name" : "Test1",
   "business_type" : "90"
}
{
   "name" : "Test1",
   "business_type" : ""
}
    @SerializedName("business_type")
    int businessType;

解决方案：

Gson gson = new Gson();

替换为

private Gson gson = new GsonBuilder()
            .registerTypeAdapter(int.class, new IntTypeAdapter())
            .registerTypeAdapter(Integer.class, new IntTypeAdapter()).create();

工具类如下

class IntTypeAdapter extends TypeAdapter<Number> {

    @Override
    public void write(JsonWriter out, Number value)
            throws IOException {
        out.value(value);
    }

    @Override
    public Number read(JsonReader in) throws IOException {
        if (in.peek() == JsonToken.NULL) {
            in.nextNull();
            return null;
        }
        try {
            String result = in.nextString();
            if ("".equals(result)) {
                return null;
            }
            return Integer.parseInt(result);
        } catch (NumberFormatException e) {
            throw new JsonSyntaxException(e);
        }
    }
}