android 讀取JSON格式文件

1.準備工作
把test.json放入assets文件夾

{
    "language":[
        {"id":1, "tools":"XCode", "name":"Swift"},
        {"id":2, "tools":"Eclipse", "name":"Java"},
        {"id":3, "tools":"Visual Studio", "name":"C#"}
    ],
    "cat":"it"
}

2.在mainactivity.java裏面進行操作

  try {
            //打開存放在assets文件夾下面的json格式的文件並且放在文件輸入流裏面
            InputStreamReader inputStreamReader = new InputStreamReader(getAssets().open("test.json"), "UTF-8");
            BufferedReader bufferedReader = new BufferedReader(inputStreamReader);

            String line;
            StringBuilder stringBuilder = new StringBuilder();
            while((line = bufferedReader.readLine()) != null) {
                stringBuilder.append(line);
            }
            bufferedReader.close();
            inputStreamReader.close();


            //新建一個json對象，用它對數據進行操作
            JSONObject jsonObject = new JSONObject(stringBuilder.toString());
            //單獨去一個值
            Log.i("TESTJSON", "cat=" + jsonObject.getString("cat"));
            JSONArray jsonArray = jsonObject.getJSONArray("language");
            //取一個數組值
            for (int i = 0; i < jsonArray.length(); i++) {
                JSONObject object = jsonArray.getJSONObject(i);
                Log.i("TESTJSON", "----------------");
                Log.i("TESTJSON", "id=" + object.getInt("id"));
                Log.i("TESTJSON", "name=" + object.getString("name"));
                Log.i("TESTJSON", "tools=" + object.getString("tools"));
            }
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (JSONException e) {
            e.printStackTrace();
        }