Android 获取Assets中的Json文件转换为实体类

import android.content.Context;

import com.commerce.img.entity.DataUrl;
import com.google.gson.Gson;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class JsonUtil {
    public DataUrl JsonToList(Context context) {
        StringBuilder stringBuilder = new StringBuilder();
        try {
            BufferedReader bf = new BufferedReader(new InputStreamReader(
                    context.getAssets().open("img.json")));
            String line;
            while ((line = bf.readLine()) != null) {
                stringBuilder.append(line);
            }
            Gson gson = new Gson();
            DataUrl bean = gson.fromJson(stringBuilder.toString(), DataUrl.class);
            return bean;
        } catch (IOException e) {
            e.printStackTrace();
        }
        return null;
    }
}

DataUrl 为实体类 
实体类的命名要和josn串键名一样
在Gson依赖('com.google.code.gson:gson:2.9.0')支持下可以通过@SerializedName("xxx")重命名

import android.content.Context
import com.google.gson.Gson
import java.io.BufferedReader
import java.io.IOException
import java.io.InputStreamReader

class JsonUtil {

fun <T> JsonToList(context: Context, fileName:String, template:Class<T>): T? {
    val stringBuilder = StringBuilder()
    try {
        val bf = BufferedReader(
            InputStreamReader(
                context.assets.open("gif/$fileName.json")
            )
        )
        var line: String?
        while (bf.readLine().also { line = it } != null) {
            stringBuilder.append(line)
        }
        val gson = Gson()
        return gson.fromJson(stringBuilder.toString(),template)
    } catch (e: IOException) {
        e.printStackTrace()
    }
    return null

}

 }