如何从SD卡读取json文件

Question

I need to read a json file from the SD card and display the data in the spinner. Is there any way to read the data from file in Android and display the contents of that file in spinner?

Answer 1

First read the file from SD card and then parse that file

Step-1 Retrieve the data from file from SD card. see tutorial

Step-2 Parse the data. See How to parse JSON String

Sample code

try {

            File dir = Environment.getExternalStorageDirectory();
            File yourFile = new File(dir, "path/to/the/file/inside/the/sdcard.ext");
            FileInputStream stream = new FileInputStream(yourFile);
            String jString = null;
            try {
                FileChannel fc = stream.getChannel();
                MappedByteBuffer bb = fc.map(FileChannel.MapMode.READ_ONLY, 0, fc.size());
                /* Instead of using default, pass in a decoder. */
                jString = Charset.defaultCharset().decode(bb).toString();
              }
              finally {
                stream.close();
              }


                    JSONObject jObject = new JSONObject(jString); 



        } catch (Exception e) {e.printStackTrace();}