I'm using volley to get a file from the internet, the file is an array. I'm saving the file in cache to do this I have to convert the file into a string. I have a function that reads the cache and pass the response to another file to display
the information, but when i'm trying to convert the resoionse back to an array i get an error
Value AuthStatus of type java.lang.String cannot be converted to JSONObject
I'm really new on android, hoping someone can point me on the right direction
private void cacheFile(JSONObject response) {
JSONObject res = response;
String filename = "jsonfile";
FileOutputStream outputStream;
try {
outputStream = openFileOutput(filename, Context.MODE_PRIVATE);
outputStream.write(res.toString().getBytes("utf-8"));
outputStream.close();
Log.e(TAG, "Bien");
} catch (Exception e) {
e.printStackTrace();
}
}
private void readCache(String filename) {
FileInputStream inputStream;
try {
inputStream = openFileInput(filename);
inputStream.read();
String body = IOUtils.toString(inputStream, StandardCharsets.UTF_8.name());
inputStream.close();
fromCache(body);
} catch (Exception e) {
e.printStackTrace();
}
}
public void fromCache(String json) {
JSONObject jsonObject = null;
try {
jsonObject = new JSONObject(json);
JSONArray jsonArray = jsonObject.getJSONArray("cars");
Log.e(TAG, "Array Size: " + jsonArray.length());
} catch (JSONException e) {
e.printStackTrace();
}
}
You have to use JSONValue.parse method as shown below:
public void fromCache(String json) {
JSONObject jsonObject = null;
try {
jsonObject = (JSONObject)JSONValue.parse(json);
JSONArray jsonArray = jsonObject.getJSONArray("cars");
Log.e(TAG, "Array Size: " + jsonArray.length());
} catch (JSONException e) {
e.printStackTrace();
}
}
Related
Currently i am fetching a package details(Onnet Minutes, Offnet Minutes, etc) from a Json file "Data.json" from assets but i know we cannot change values from assets. So my Question is how to copy Data.json to internal storage and then Load it for read/Write.
I am using this to load Data.Json from Assets
public String loadJSONFromAsset() {
String json = null;
try {
InputStream is = getAssets().open("Data.json");
int size = is.available();
byte[] buffer = new byte[size];
is.read(buffer);
is.close();
json = new String(buffer, "UTF-8");
Toast.makeText(jazz_sim_lagao_offer_details.this, "JSON Loaded", Toast.LENGTH_SHORT).show();
} catch (IOException ex) {
ex.printStackTrace();
return null;
}
return json;
}
and using this code to update data
private void UpdateData() {
JSONObject JSONobj = null;
try {
loadJSONFromAsset();
//get JSONObject from JSON file
JSONobj = new JSONObject(loadJSONFromAsset());
//fetch JSONObject named
JSONObject Jazz_SimLagaoOffer = JSONobj.getJSONObject("packages").getJSONObject("jazz_packages").getJSONObject("call_packages").getJSONObject("sim_lagao_offer");
String Jazz_SimLagaoOffer_ONNET = Jazz_SimLagaoOffer.getString("onnet");
Jazz_SimLagaoOffer_OnNet_TextView.setText(Jazz_SimLagaoOffer_ONNET);
String Jazz_SimLagaoOffer_OFFNET = Jazz_SimLagaoOffer.getString("offnet");
Jazz_SimLagaoOffer_OffNet_TextView.setText(Jazz_SimLagaoOffer_OFFNET);
String Jazz_SimLagaoOffer_MBs = Jazz_SimLagaoOffer.getString("mbs");
Jazz_SimLagaoOffer_Mb_TextView.setText(Jazz_SimLagaoOffer_MBs);
String Jazz_SimLagaoOffer_SMS = Jazz_SimLagaoOffer.getString("sms");
Jazz_SimLagaoOffer_Sms_TextView.setText(Jazz_SimLagaoOffer_SMS);
String Jazz_SimLagaoOffer_SUBCODE = Jazz_SimLagaoOffer.getString("sub_code");
Jazz_SimLagaoOffer_Sub_Code_TextView.setText(Jazz_SimLagaoOffer_SUBCODE);
String Jazz_SimLagaoOffer_CHECKCODE = Jazz_SimLagaoOffer.getString("check_code");
Jazz_SimLagaoOffer_Check_Code_TextView.setText(Jazz_SimLagaoOffer_CHECKCODE);
String Jazz_SimLagaoOffer_UNSUBCODE = Jazz_SimLagaoOffer.getString("unsub_code");
Jazz_SimLagaoOffer_Unsub_Code_TextView.setText(Jazz_SimLagaoOffer_UNSUBCODE);
Jazz_SimLagaoOffer_Charges = Jazz_SimLagaoOffer.getString("charges");
} catch (JSONException e) {
e.printStackTrace();
Toast.makeText(getBaseContext(), JSONobj + "", Toast.LENGTH_SHORT).show();
}
}
How to Get Json Object?
Here is My Data.Json
{
"packages" : {
"jazz_packages" : {
"call_packages" : {
"sim_lagao_offer" : {
"charges" : "0.01",
"check_code" : "*551*2#",
"mbs" : "1500",
"offnet" : "5000",
"onnet" : "3000",
"sms" : "3000",
"sub_code" : "*551#",
"unsub_code" : "*551*3#"
}
}
}
}
}
Try this
private void CopyAssets() {
AssetManager assetManager = getAssets();
String[] files = null;
System.out.println("File name => "+filename);
InputStream in = null;
OutputStream out = null;
try {
in = assetManager.open(YOUR_ASSETS_FILE); // if files resides inside the "Files" directory itself
out = new FileOutputStream(STORAGE_PATH).toString() +"/" + filename);
copyFile(in, out);
in.close();
in = null;
out.flush();
out.close();
out = null;
} catch(Exception e) {
e.printStackTrace();
}
}
private void copyFile(InputStream in, OutputStream out) throws IOException {
byte[] buffer = new byte[1024];
int read;
while((read = in.read(buffer)) != -1){
out.write(buffer, 0, read);
}
}
Use below code to read from storage
String jsongString = readFromFile();
JSONObject mainJsonObject = new JSONObject(jsongString);
JSONObject Jazz_SimLagaoOffer = mainJsonObject.getJSONObject("packages").getJSONObject("jazz_packages").getJSONObject("call_packages").getJSONObject("sim_lagao_offer");
Use below method to read data from internal storage file and return as String.
private String readFromFile() {
String ret = "";
InputStream inputStream = null;
try {
inputStream = openFileInput("names.json");
if ( inputStream != null ) {
InputStreamReader inputStreamReader = new InputStreamReader(inputStream);
BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
String receiveString = "";
StringBuilder stringBuilder = new StringBuilder();
while ( (receiveString = bufferedReader.readLine()) != null ) {
stringBuilder.append(receiveString);
}
ret = stringBuilder.toString();
}
}
catch (FileNotFoundException e) {
Log.e("login activity", "File not found: " + e.toString());
} catch (IOException e) {
Log.e("login activity", "Can not read file: " + e.toString());
}
finally {
try {
inputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
return ret;
}
Hope this work :)
I Got Answer my own Question after 1 Day Research and Thanks to #pratik vekariya
helped me a lot.
CopyAssets() works perfect as defined #pratik vekariya in his answer and to readfromfile see my Question loadJSONFromAssets()
and i Just replaced line
InputStream is = getAssets().open("Data.json");
with this
InputStream is = new FileInputStream(getFilesDir().toString() +"/" + "Data.json");
to to load .json file from files and get json object from inputStrem
I have the following object:
{
"some_prop": "sweetvalue",
"some_list": ["0f9f822cd7e64000ac056ebc17b82f1d", "0f9f82223094fj7b82f1d"]
}
And I'm trying to get some_list and write to some_list, afterwards saving to a file. using the following code:
public String getData(String key) { // this is confusion should be getConfigValue
String data = getConfig();
JSONObject jsonData;
Object content = null;
try {
jsonData = new JSONObject(data);
if (key != null) {
content = jsonData.getString(key);
} else {
content = jsonData.toString();
}
} catch (JSONException e) {
e.printStackTrace();
}
return content.toString();
}
private void saveFile(String data) {
File file = configFile;
try (FileOutputStream fop = new FileOutputStream(file)) {
if (!file.exists()) file.createNewFile();
byte[] contentInBytes = data.getBytes();
fop.write(contentInBytes);
fop.flush();
fop.close();
} catch (IOException e) {
e.printStackTrace();
}
}
public void appendToArrayValue(String uuid) {
JSONObject configData = new JSONObject(getConfig());
JSONArray mutedPlayers = configData.getJSONArray("some_list");
JSONArray uuidArray = new JSONArray(uuid);
JSONArray newArray = concatArray(mutedPlayers, uuidArray);
JSONObject newConfigData = configData.put("some_list", newArray);
saveFile(newConfigData.toString());
}
When trying to run this code, I get the following error:
org.json.JSONException: A JSONArray text must start with '[' at 1 [character 2 line 1]
I'm not sure what's really wrong, I know my code is terrible but that's it.
Looks like the error is at line JSONArray uuidArray = new JSONArray(uuid);?
Because prevoius line JSONArray mutedPlayers = configData.getJSONArray("some_list"); should work fine.
If so, you are passing not an array to new JSONArray(uuid) since uuid is your whole JSON object.
I am trying to extract values from JSON from the URL provided below using GSON java library:
http://api.wunderground.com/api/b28d047ca410515a/forecast/q/-33.912,151.013.json
I have successfully used the code provided below to extract data from URL below:
http://api.wunderground.com/api/b28d047ca410515a/conditions/q/-33.912,151.013.json
Code:
String url = "http://api.wunderground.com/api/b28d047ca410515a/conditions/q/-33.912,151.013.json";
String url2 = "http://api.wunderground.com/api/b28d047ca410515a/forecast/q/-33.912,151.013.json";
InputStream is = null;
try {
is = new URL(url).openStream();
BufferedReader rd = new BufferedReader(new InputStreamReader(is, Charset.forName("UTF-8")));
String jsonText = readAll(rd);
JsonElement je = new JsonParser().parse(jsonText);
System.out.println("Current Temperature:" + getAtPath(je, "current_observation/temp_c").getAsString() );
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
if (is != null)
is.close();
} catch (IOException e) {
e.printStackTrace();
}
}
However I am getting exception trying to extract from url2 as per code below , it seems to be a more complicated json to get values from, any help please?
// below code not working
weather_icon_url = getAtPath(je, "current_observation/icon_url").getAsString();
is = new URL(url2).openStream();
BufferedReader rd2 = new BufferedReader(new InputStreamReader(is, Charset.forName("UTF-8")));
String jsonText2 = readAll(rd2);
JsonElement je2 = new JsonParser().parse(jsonText2);
System.out.println("max Temperature:" + getAtPath(je2, "forecast/simpleforecast/forecastday/high/celsius").getAsString() );
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
if (is != null)
is.close();
} catch (IOException e) {
e.printStackTrace();
}
}
getAtPath code:
private static JsonElement getAtPath(JsonElement e, String path) {
JsonElement current = e;
String ss[] = path.split("/");
for (int i = 0; i < ss.length; i++) {
current = current.getAsJsonObject().get(ss[i]);
}
return current;
}
The problem you are facing is because there is an issue with the getAtPath implementation.
[{"date":{"epoch":"1459152000"... represents a JSONArray which the method is trying to access as JSONObject. Hence the IllegalStateException.
JsonObject com.google.gson.JsonElement.getAsJsonObject()
convenience method to get this element as a JsonObject. If the element
is of some other type, a IllegalStateException will result. Hence it
is best to use this method after ensuring that this element is of the
desired type by calling isJsonObject() first.
You can update and use something like below, as of now it returns only the first element.
private static JsonElement getAtPath(JsonElement e, String path) {
JsonElement current = e;
String ss[] = path.split("/");
for (int i = 0; i < ss.length; i++) {
if(current instanceof JsonObject){
current = current.getAsJsonObject().get(ss[i]);
} else if(current instanceof JsonArray){
JsonElement jsonElement = current.getAsJsonArray().get(0);
current = jsonElement.getAsJsonObject().get(ss[i]);
}
}
return current;
}
This should work:
System.out.println("max Temperature:" + getAtPath(je2, "forecast/simpleforecast/forecastday/high/celsius").getAsString() );
This question already has answers here:
Converting JSON data to Java object
(14 answers)
Closed 6 years ago.
Here is what I have so far:
public Bitmap getAlbumCover(Context context, String song, String artist) {
this.context = context;
song = song.replace(" ", "%20");
artist = artist.replace(" ", "%20");
try {
conn = new URL("https://api.spotify.com/v1/search?q=track" + song + ":%20artist:" + artist + "&type=track)").openConnection();
} catch (IOException e) {
e.printStackTrace();
}
if (conn != null)
conn.setDoOutput(true);
try {
reader = new BufferedReader(new InputStreamReader(conn.getInputStream()));
} catch (IOException e) {
e.printStackTrace();
}
if (reader != null) {
// Read Server Response
String line2 = null;
try {
while ((line2 = reader.readLine()) != null) {
sb.append(line2);
}
} catch (IOException e) {
e.printStackTrace();
}
try {
json = new JSONArray(sb.toString());
} catch (JSONException e) {
e.printStackTrace();
}
}
JSONParser parser= new JSONParser();
try {
JSONObject jsonObject = (JSONObject) parser.parse(reader);
try {
array = (JSONArray) jsonObject.get("items");
} catch (JSONException e) {
e.printStackTrace();
}
// take each value from the json array separately
} catch (IOException e) {
e.printStackTrace();
} catch (ParseException e) {
e.printStackTrace();
}
return null;
}
The JSON I am using is located here:
https://api.spotify.com/v1/search?q=track:Ready%20To%20Fall%20artist:rise%20against%20&type=track
I am trying to get the image url located in the images array and the preview_track url located in items.
I use Jackson library to parse JSON to java opbject.
if you create your java object with the same structure as JSON this can be done using this:
ObjectMapper mapper = new ObjectMapper();
mapper.readValue(jsonUrl, YourClass.class);
So your OBJECT will have tracks and then tracks will have object album and album will have object other details. Just structure it as the JSON is and you are there.
I need to update a value in my JSON file using java but somehow I am unable to.Following is my JSON format which I am trying to parse
{
"recentActivities":[
{
"displayValue":"POC | Augmented Reality",
"link":"poc.jsp?search=augmented%20reality",
"timestamp":"18/07/2013 17:33"
},
{
"displayValue":"POC | Image Editing in Hybrid Application",
"link":"poc.jsp?search=image%20editing",
"timestamp":"18/07/2013 01:00"
}
],
"lastEmailSent": "29/06/2013 00:00"
}
I need to update lastEmailSent to current date but somehow I am getting stuck. Below is my java code which i am using
private void updateLastEmailTimeStamp(String jsonFilePath) {
JSONParser parser = new JSONParser();
JSONObject jsonObject = new JSONObject();
JSONObject lastEmailTimeStamp = new JSONObject();
FileReader reader =null;
try {
File jsonFile = new File(jsonFilePath);
reader = new FileReader(jsonFile);
jsonObject = (JSONObject) parser.parse(reader);
lastEmailTimeStamp = (JSONObject) jsonObject.get("lastEmailSent");
//write current date as last mail sent time.
writeTimeStamp(lastEmailTimeStamp, jsonFile);
APP_LOGGER.info("last Email Sent timestamp updated");
} catch (IOException ex) {
APP_LOGGER.error(ex.getLocalizedMessage(), ex);
} catch (ParseException ex) {
APP_LOGGER.error(ex.getLocalizedMessage(), ex);
}
}
private void writeTimeStamp(JSONObject lastEmailTimeStamp, File jsonFile) {
FileWriter writer = null;
try{
writer = new FileWriter(jsonFile);
String currentDate = MyDateFormatterUtility.formatDate(new Date(),"dd/MM/yyyy HH:mm");
lastEmailTimeStamp.put(SubscriptionConstants.LAST_EMAIL_TIMESTAMP, currentDate);
writer.write(lastEmailTimeStamp.toJSONString());
}catch(IOException ex){
APP_LOGGER.error(ex.getLocalizedMessage(), ex);
}finally{
try {
writer.flush();
writer.close();
} catch (IOException ex) {
APP_LOGGER.error(ex.getLocalizedMessage(), ex);
}
}
}
I am getting error in the following line
lastEmailTimeStamp = (JSONObject) jsonObject.get("lastEmailSent");.
I guess I am not correctly parsing or accessing the object. Can somebody please make me correct?
Thank you!
I agree with #Hot Licks, but you can try fixing it by doing:
String lastEmailSent = jsonObject.getString("lastEmailSent");
Also, if that isn't the problem, it may be that the text coming from your file is not exactly the JSON text you posted here. In which case, you can read the file into a string, add a breakpoint and check the string to see if it has all the JSON elements you expect it to.
In Java 7 you can read the text in like:
String content = readFile(jsonFilePath, Charset.defaultCharset());
static String readFile(String path, Charset encoding)
throws IOException
{
byte[] encoded = Files.readAllBytes(Paths.get(path));
return encoding.decode(ByteBuffer.wrap(encoded)).toString();
}
Finally, i was able to figure out the solution. Following changes were needed in the code
private void updateLastEmailTimeStamp(String jsonFilePath) {
JSONParser parser = new JSONParser();
JSONObject jsonObject = new JSONObject();
FileReader reader =null;
try {
File jsonFile = new File(jsonFilePath);
reader = new FileReader(jsonFile);
jsonObject = (JSONObject) parser.parse(reader);
jsonObject.remove("lastEmailSent");
//write current date as last mail sent time.
writeTimeStamp(jsonObject, jsonFile);
APP_LOGGER.info("last Email Sent timestamp updated");
} catch (IOException ex) {
APP_LOGGER.error(ex.getLocalizedMessage(), ex);
} catch (ParseException ex) {
APP_LOGGER.error(ex.getLocalizedMessage(), ex);
} catch (RuntimeException e) {
e.printStackTrace();
}catch (Exception e) {
e.printStackTrace();
}
}
/**
* Method to write current date as last mail sent timestamp
* denoting when the newsletter was sent last.
*
* #param jsonObj- date for last email sent.
* #param jsonFile - recentactivities.json file
*/
#SuppressWarnings("unchecked")
private void writeTimeStamp(JSONObject jsonObj, File jsonFile) {
FileWriter writer = null;
try {
writer = new FileWriter(jsonFile);
String currentDate = MyDateFormatter.formatDate(new Date(),"dd/MM/yyyy HH:mm");
jsonObj.put("lastEmailSent", currentDate);
writer.write(jsonObj.toJSONString());
}catch(IOException ex){
APP_LOGGER.error(ex.getLocalizedMessage(), ex);
}finally{
try {
writer.flush();
writer.close();
} catch (IOException ex) {
APP_LOGGER.error(ex.getLocalizedMessage(), ex);
}
}
}