1 本文的json資料格式：

{
  "hotcolumns":[
	{
	  "client": "mobile",
	  "cname": "看東西",
	  "ename": "ldax",
	  "hot": true,
	},
	{
	  "client": "mobile",
	  "cname": "仁說",
	  "ename": "sda,
	  "hot": true,
	}
  ]
}

2 生成的model（JavaBean）

import java.util.List;


public class JsonBean {

    public List<Hotcolumns> hotcolumns;

    public List<Hotcolumns> getHotcolumns() {
        return hotcolumns;
    }

    public void setHotcolumns(List<Hotcolumns> hotcolumns) {
        this.hotcolumns = hotcolumns;
    }

   
/*
   "client": "mobile",
		"cname": "看東西",
		"ename": "ldx",
		"hot": true,
		
    */

    public static class Hotcolumns {

        public String client;
        public String cname;
        public String ename;
        public String hot;
        

       
        public String getClient() {
            return client;
        }

        public void setClient(String client) {
            this.client = client;
        }

        public String getCname() {
            return cname;
        }

        public void setCname(String cname) {
            this.cname = cname;
        }

        public String getEname() {
            return ename;
        }

        public void setEname(String ename) {
            this.ename = ename;
        }

        public String getHot() {
            return hot;
        }

        public void setHot(String hot) {
            this.hot = hot;
        }

        
    }


}
 

3 呼叫

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        String json =readLocalJson(this);  //讀取資料 實際專案中一般載入網路資料：需非同步請求網路
        json=json.replace("\t","");
        Gson gson = new Gson();
        java.lang.reflect.Type type = new TypeToken<JsonBean>() {}.getType();
        JsonBean jsonBean = gson.fromJson(json, type); //JsonBean.class

    }
    public static String readLocalJson(Context context){//這裡測試程式 放在本地
        String jsonString="";
        String resultString="";

        try {
            InputStream inputStream = context.getResources().openRawResource(R.raw.test);
            BufferedReader bufferedReader=new BufferedReader(new InputStreamReader(inputStream));
            while ((jsonString=bufferedReader.readLine())!=null) {
                resultString+=jsonString;
            }
        } catch (Exception e) {
            // TODO: handle exception
        }
        return resultString;
    }


}
 

若為簡單的型別 可使用： gson.from(json JsonBean.class)

若為複雜的型別 ：  使用反射

本文兩者皆可。