Geek Answers Handbook

Android internal storage, how to parse a JSON text file correctly

I am creating an Android application that creates a text file with JSON objects and writes it to internal storage. For this, I have the following code:

JSONObject myJSON = new JSONObject();
//Set the JSON object with website, length and Id (time-stamp)
try {
    myJSON.put("Length", trim)
    .put("Website", data)
    .put("Id", tx);
} catch (JSONException e1) {
    e1.printStackTrace();
}

//Convert JSON object to a string and add a comma
String myJSONString = myJSON.toString();
myJSONString += ", ";

try {
     FileOutputStream fos = openFileOutput(FILENAME, Context.MODE_APPEND);
     fos.write(myJSONString.getBytes());
     fos.close();
     //Log.d(TAG, "Written to file");

} catch (Exception e) {
    Log.d(TAG, "cought");
    e.printStackTrace();
}

Now I get a text file that looks like this:

{"Id":"20101211T155146","Length":10}, {"Id":"20101211T155155","Length":10},
{"Id":"20101211T155203","Length":10}, {"Id":"20101211T155252","Length":10},

I would like to collect this data in a JSON file. An application should write, store and retrieve JSON. The problem is that when I iterate over JSON objects from a file using:

String x = "";
InputStream is = this.getResources().openRawResource(R.raw.pwh);
byte [] buffer = new byte[is.available()];
while (is.read(buffer) != -1);
String jsontext = new String(buffer);
JSONArray entries = new JSONArray(jsontext);

x = "JSON parsed.\nThere are [" + entries.length() + "]\n\n";

int i;
for (i=0;i<entries.length();i++)
{
    JSONObject post = entries.getJSONObject(i);
    x += "------------\n";
    x += "Id:" + post.getString("Id") + "\n";
    x += "Length:" + post.getString("Length") + "\n\n";
}

He gives an error. I got the parsing code from a large tutorial at: http://www.ibm.com/developerworks/web/library/x-andbene1/?ca=drs-#author1 In this example, the code expects brackets around the entire file and without a comma after the last object. Therefore, I will need:

[{"Id":"20101211T155146","Length":10}, {"Id":"20101211T155155","Length":10},
{"Id":"20101211T155203","Length":10}, {"Id":"20101211T155252","Length":10}]

JSON ; JSON, ?

UPDATE:

, JSON , , JSON . :

[
     {
          "phonenumber": "15555215554",
          "time": "20110113T173835",
          "username": "edit username",
          "email": " edit email",
          "password": "edit password"
     }
][
     {
          "phonenumber": "15555215554",
          "time": "20110113T173900",
          "username": "edit username",
          "email": " edit email",
          "password": "edit password"
     },
     {
          "phonenumber": "15555215554",
          "time": "20110113T173900",
          "username": "edit username",
          "email": " edit email",
          "password": "edit password"
     }
]

, , , ?

+5
2

JSONArray JSON objects. toString(), . .

http://developer.android.com/reference/org/json/JSONArray.html

+3

  • JSON, JSON-Objects ({...}) ([]). , [

    • , , ] (,)

    • . , , f.ex.

      try {
    FileChannel ch = fos.getChannel();
    ch.position(ch.position -1);
    ch.write(", ".getBytes());
    ch.write(ByteBuffer.wrap(myJSONString.getBytes()));
    ch.write("]".getBytes());
} finally {
    out.close();
}

  • ( "" ): , ( JSONArray.put()) .

    , Context.MODE_APPEND 0, API.

    , . , , ][, , JSON ( , JSONArray.put()).

0

More articles:


All Articles