Develop Reference

EditText is not displaying translation while Logcat does

I am using Yandex.Translate API to translate a String. It does so successfully as seen in the logcat. But when I set the EditText value (eText) to the translation result, it doesn't parse the data correctly and it shows something like {"code":200,"lang":"en-ru","text":["Он не работает!"]}, the second result instead of the first required result which is "Он не работает!"
2019-06-11 02:36:57.917 14680-
14731/com.bahraindiction.goldeneagle.sightling D/Translation Result:: Он
не работает!
2019-06-11 02:36:57.918
1468014680/com.bahraindiction.goldeneagle.sightling D/Translation Result:
{"code":200,"lang":"en-ru","text":["Он не работает!"]}
TranslatorBackgroundTask translatorBackgroundTask= new TranslatorBackgroundTask(context);
String translationResult = null; // Returns the translated text as a String
try {
translationResult = translatorBackgroundTask.execute(textToBeTranslated,languagePair).get();
} catch (ExecutionException e) {
e.printStackTrace();
} catch (InterruptedException e) {
e.printStackTrace();
}
Log.d("Translation Result",translationResult); // Logs the result in Android Monitor
eText.setText(translationResult);
}
As seen above, Log.d displays the translated result correctly AND displays the "unparsed" translation, while eText only displays the unparsed result only.

translationResult is in JSON format, Please parse that JSON first and pick the text string and set to eText. You can use gson or similar library to parse JSON.

Can't get a string from nested downloaded JSON [duplicate]

This question already has answers here:
How do I parse JSON in Android? [duplicate]
(3 answers)
Closed 5 years ago.
I'm getting a JSON from the server:
JSONObject vkjson = response.json;
I have tried to make it a string and check via LogCat to make sure it works - and yeah, it 100% works.
But it is nested:
{"response":{"first_name":"...","last_name":"..."} }
I have tried to do this:
String result = vkjson.getJSONObject("response").getString("first_name");
But IDE doesn't like the getJSONObject part and underlines it. IDE says:
Unhandled exception in org.json.JSONException
What's wrong? Is it because the JSON is loading from the server or the code is incorrect?
Thank you in advance.

Unhandled exception in org.json.JSONException
Mean that the method can throw a JSONException and you have to handle it.
So you have to:
try {
String result = vkjson.getJSONObject("response").getString("first_name");
} catch (JSONException exception){
//Handle exception here
}

There's nothing wrong with your code other than not handling the JSONException which is potentially thrown (i.e. what would happen if there isn't an object called "response").
You need to look at exception handling and wrap this code in a try .. catch block or otherwise deal with the exception.
Java exception handling

Do this-:
try
{
JSONObject vkjson = response.json;
//More code related to json
}
catch(JsonException e)
{
e.printStackTrace();
}

JSONObject jsonObject = null;
try {
jsonObject = new JSONObject(responseString);
if(jsonObject != null)
{
if (jsonObject.has("response")) {
JSONObject responseObject = jsonObject.getJSONObject("response");
String firstName = responseObject.getString("first_name");
Log.d("Tag",firstName);
}
}
} catch (JSONException e) {
e.printStackTrace();
}

Weird JSON encoding issue on Android 4.1.2

I have an issue on Android 4.1.2 where a JSON object given to us by our REST API gets encoded weirdly when sending back.
This is the snippet of json I'm getting:
"cost":{
"amount": 0,
"currency": "GBP"
}
I'm wanting to pretty much just pass this particular snippet back the same way (modifying other parts of the json), but this is what I get on Android 4.1.2:
"cost":"{amount=0, currency=GBP}"
The function I believe is causing this weird encoding is here:
private StringEntity getEntityForRequest(final Payment payment, final PaymentDelegate delegate) {
JSONObject json = new JSONObject();
MyApplication.getContext().addApplicationInformationToJSONObject(json);
StringEntity entity = null;
try {
entity = new StringEntity(json.toString(), "UTF-8");
} catch (UnsupportedEncodingException e1) {
payment.markAsFailed("Reservation failed, data returned not expected.");
save(payment);
if (delegate != null) {
delegate.onFailure(new MyError(MyError.DEFAULT_STATUS, MyError.DEFAULT_TYPE, "Payment error", "Error during reservation"));
}
}
return entity;
}
This is the addApplicationIformationToJSONObject function:
/**
* Adds system information to a JSON object.
*/
public void addApplicationInformationToJSONObject(JSONObject json) {
try {
try {
json.put("app_version", getPackageManager().getPackageInfo(getPackageName(), 0).versionName);
} catch (NameNotFoundException e) {
json.put("app_version", "Unknown");
}
json.put("device", getDeviceName());
json.put("os_type", "android");
json.put("os_version", String.format("%d", Build.VERSION.SDK_INT));
json.put("device_id", Secure.getString(getContext().getContentResolver(), Secure.ANDROID_ID));
} catch (JSONException e) {
MyLog.e("MyApplication", "Error when adding system information to JSON");
}
}
What's causing this weird encoding?
How can I modify the code to avoid issues like this?

Found a solution. It seems older version interprets that cost snippet as a string rather than a JSONObject. Doing this seems to solve the issue:
ticketObject.remove("cost");
ticketObject.put("cost", new JSONObject(getCost()));

Type mismatch: cannot convert from Object to JSONObject

I'm relatively new to Android development and am writing my first REST-based app. I've opted to use the Android Asynchronous HTTP Client to make things a bit easier. I'm currently just running through the main "Recommended Usage" section on that link, essentially just creating a basic static HTTP client. I'm following the code given, but changing it around to refer to a different API. Here's the code in question:
public void getFactualResults() throws JSONException {
FactualRestClient.get("q=Coffee,Los Angeles", null, new JsonHttpResponseHandler() {
#Override
public void onSuccess(JSONArray venues) {
// Pull out the first restaurant from the returned search results
JSONObject firstVenue = venues.get(0);
String venueName = firstVenue.getString("name");
// Do something with the response
System.out.println(venueName);
}
});
}
The String venueName = firstVenue.getString("name"); line is currently throwing an error in Eclipse: "Type mismatch: cannot convert from Object to JSONObject". Why is this error occurring? I searched other threads which led me to try using getJSONObject(0) instead of get(0) but that led to further errors and Eclipse suggesting using try/catch. I haven't changed any of the code on the tutorial, save for the variable names and URL. Any thoughts/tips/advice?
Thanks so much.
EDIT:
Here is the onSuccess method, modified to include the try/catch blocks suggested. Eclipse now shows the "local variable may not have been initialized" for firstVenue here: venueName = firstVenue.getString("name"); and for venueName here: System.out.println(venueName); Even if I initialize String venueName; directly after JSONObject firstVenue; I still get the same error. Any help in resolving these would be greatly appreciated!
public void onSuccess(JSONArray venues) {
// Pull out the first restaurant from the returned search results
JSONObject firstVenue;
try {
firstVenue = venues.getJSONObject(0);
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
String venueName;
try {
venueName = firstVenue.getString("name");
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
// Do something with the response
System.out.println(venueName);
}

You can try to convert object you are getting from querying to String and then use
final JSONObject jsonObject = new JSONObject(stringresult);
I was getting same error earlier, it worked for me.

Yes, you should be using getJSONObject to ensure that the value you obtain is a JSON object. And yes, you should catch the possible JSONException which is thrown if that index in the array doesn't exist, or does not contain an object.
It'll look something like this:
JSONObject firstVenue;
try {
firstVenue = venues.get(0);
} catch (JSONException e) {
// error handling
}

convert obj to json Object:
Object obj = JSONValue.parse(inputParam);
JSONObject jsonObject = (JSONObject) obj;

The solution provided by Shail Adi only worked for me by setting the initial values of firstVenue and venueName to null. Here's my code:
JSONObject firstVenue = null;
try {
firstVenue = (JSONObject)venues.get(0);
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
String venueName = null;
try {
venueName = firstVenue.getString("name");
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
// Do something with the response
System.out.println(venueName);

Why am I getting warnings Serialize ArrayList

I'm getting odd warnings in my reading of a ArrayList of Serializable objects. Here is the code:
public void loadBoard() {
FileInputStream fis = null;
ObjectInputStream is;
try {
fis = this.openFileInput(saveFile);
is = new ObjectInputStream(fis);
// Build up sample vision board
if (mVisionBoard == null) {
mVisionBoard = new ArrayList<VisionObject>();
} else {
mVisionBoard.clear();
}
ArrayList<VisionObject> readObject = (ArrayList<VisionObject>) is.readObject();
mVisionBoard = readObject;
is.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
Log.e(TAG, "loadBoard failed: "+e);
} catch (StreamCorruptedException e) {
e.printStackTrace();
Log.e(TAG, "loadBoard failed: "+e);
} catch (IOException e) {
e.printStackTrace();
Log.e(TAG, "loadBoard failed: "+e);
} catch (ClassNotFoundException e) {
e.printStackTrace();
Log.e(TAG, "loadBoard failed: "+e);
}
}
and the warning I'm getting is (on readObject line):
"Type safety: unchecked cast from Object to ArrayList"
The few examples I've read indicate that this is the correct code for reading an ArrayList of serializable objects. The code I made to write the arraylist isn't giving me any warnings. Am I doing something wrong here?

kind of late but it will help someone...
the reason of the warning is because of the return of the method readObject...
see:
public final Object readObject()
it returns actually an object
and if you just by mistake read and deserialize a lets say String object ant try to cast that into an array list then you will get a runtime execption (the reason must be obvious)
in order to avoid that predictable failure you can check the type of the returned object before the cast...
that is why you get the warning:
"Type safety: unchecked cast from Object to ArrayList<VisionObject>"