月笔记(2018-3)

解决android.view.View android.view.ViewStub.inflate()' on a null object reference异常

解决:就是ViewStub只能调用inflate一次,代码如下:

 View viewStub = findViewById(R.id.grey_mask_container);
 viewStub.inflate();

修改为

 View viewStub = findViewById(R.id.grey_mask_container);
 if(viewStub != null){
      viewStub.inflate();
 }

服务器接收的Json数据有问题

错误写法

 try{

            JSONArray jsonArray = new JSONArray();

            JSONObject jsonObject = new JSONObject();
            jsonObject.put("goodsId", "123456");

            jsonArray.put(jsonObject);

            JSONObject paramsObj = new JSONObject();
            paramsObj.put("goods", jsonArray.toString());

            Log.d(TAG, "result: "+paramsObj);
        }catch (Exception e){
            e.printStackTrace();
        }

输出:

result:{"goods":"[{\"goodsId\":\"123456\"}]"}

正确写法

try{

            JSONArray jsonArray = new JSONArray();

            JSONObject jsonObject = new JSONObject();
            jsonObject.put("goodsId", "123456");

            jsonArray.put(jsonObject);

            JSONObject paramsObj = new JSONObject();
            paramsObj.put("goods", jsonArray);

            Log.d(TAG, "setupView: "+paramsObj);
        }catch (Exception e){
            e.printStackTrace();
        }

输出:

result:{"goods":[{"goodsId":"123456"}]}

结论:JSONArray调用了toString会导致服务器接收的数据有""