原生json获取数据

  private int index = 0;

    //写一个集合记录所有的头条数据
    private List<String> list = new ArrayList<>();

    private Handler handler = new Handler(){
        @Override
        public void handleMessage(Message msg) {
            if (msg.what == 0){
                String json = (String) msg.obj;

                Log.i("json---",json);

                //解析...android中json格式的数据只有两种,,一种是{}对应的,解析出来是对象;;;一种是[]对应的,这种是数组或者集合
                //1.集合或者数据在json原生解析,使用的JSONArray这个类...{}对应的在原声解析里面是JSONObject

                //2.使用gson解析数组格式的json字符串
                Gson gson = new Gson();
                Type type = new TypeToken<List<String>>() {}.getType();

                List<String> jsonList = gson.fromJson(json,type);

                Log.i("----",jsonList.size()+"长度");

                try {
                    JSONArray jsonArray = new JSONArray(json);

                    //遍历这个json格式的数组
                    for (int i=0;i<jsonArray.length();i++){

                        String string = jsonArray.getString(i);
                        //添加到集合里面去
                        list.add(string);
                    }

                    //设置第一条数据的显示
                    text_toutiao.setText(list.get(index));
                    //发送一个延时的消息
                    handler.sendEmptyMessageDelayed(1,3000);

                } catch (Exception e) {
                    e.printStackTrace();
                }
            }else  if (msg.what == 1){
                //接收到延时消息
                index ++;

                //取余
                index = index%list.size();

                text_toutiao.setText(list.get(index));

                //发送一个延时的消息
                handler.sendEmptyMessageDelayed(1,3000);
            }
        }
    };