Question

大家好我试图解析这个LINK的JSON文件。

返回的JSON如下 -

我需要首先遍历 journeys 的所有实例，然后我必须为每个 {循环 legs {1}} 获取 journeys 指令。正如您所看到的，每个 detailed 的 legs 部分返回 instruction ，最终目标是将这些 string 组合在一起，并将其显示为 string 。因此，对于上述JSON，最终目标是显示 -

Jubilee线向Stratford或North Greenwich

对Edgware的北线，或高Barnet

直到现在我一直在努力浏览 TextView 而没有任何运气。

以下是我一直在努力的代码 -

JSON

我相信我的做法是错误的，我没有把循环弄好。解析和导航的建议以及任何其他方法都将受到高度赞赏！

谢谢！

更新：

Answer 1

JSONArray journeys = new JSONObject("");
        for(int i = 0 ; i < journeys.length() ; i++) { // Traverse journeys
            JSONObject journey = journeys.getJSONObject(i); // get journeys(i) -> journey
            if(journey.has("legs")) { // if journey has "legs" key
                JSONArray legs = journey.getJSONArray("legs"); // get the legs array from journey object
                for(int j = 0 ; j < legs.length() ; j++) { // Traverse legs
                    JSONObject leg = legs.getJSONObject(j); // get legs(j) -> leg
                    if(leg.has("instruction")) { // if leg has "instruction" key in it 
                        JSONObject instruction = leg.getJSONObject("instruction"); // get instruction jsonObject
                        String detailed = instruction.optString("detailed", "Fallback detailed"); // get detailed string in instruction object
                    }
                }
            }
        }

更新

private static class Detail {
        String journeyType;
        String legType;
        String instructionType;
        String detail;

        public Detail(String journeyType, String legType, String instructionType, String detail) {
            this.journeyType = journeyType;
            this.legType = legType;
            this.instructionType = instructionType;
            this.detail = detail;
        }
    }

... ...

List<Detail> detailList = new ArrayList<>();
        JSONArray journeys = new JSONObject("");
        for(int i = 0 ; i < journeys.length() ; i++) { // Traverse journeys
            JSONObject journey = journeys.getJSONObject(i); // get journeys(i) -> journey
            if(journey.has("legs")) { // if journey has "legs" key
                JSONArray legs = journey.getJSONArray("legs"); // get the legs array from journey object
                for(int j = 0 ; j < legs.length() ; j++) { // Traverse legs
                    JSONObject leg = legs.getJSONObject(j); // get legs(j) -> leg
                    if(leg.has("instruction")) { // if leg has "instruction" key in it
                        JSONObject instruction = leg.getJSONObject("instruction"); // get instruction jsonObject
                        String journeyType = journey.getString("$type");
                        String legType = leg.getString("$type");
                        String instructionType = instruction.getString("$type");
                        String detailed = instruction.getString("detailed"); // get detailed string in instruction object
                        detailList.add(new Detail(journeyType, legType, instructionType, detailed));
                    }
                }
            }
        }
        for(Detail detail : detailList) {
            TextView textView = new TextView([yourContext]);
            textView.setText(detail.detail);
            yourContentViewGroup.addView(textView);
            // or you can use View.inflate(context, layoutRes, yourContentViewGroup) and design a layout to show other detail instance values
        }

TFL开放数据的JSON解析

1 个答案: