Develop Reference

Making multiple process at the same time with handler error

I am creating app that can run 2 process at the time (saving to database / sending to api) but , i was encountering issue from my treading.This is my code upon my threading:
this is my code:
public void timerToSaveSend() {
Thread t1 = new Thread() {
#Override
public void run() {
saving();
}
};
t1.start();
Thread t2 = new Thread(){
#Override
public void run() {
sending();
}
};
t2.start();
}
private void sending() {
//dataSendApi
handler10 = new Handler();
handler10.postDelayed(new Runnable() {
#Override
public void run() {
try {
Retrofit.Builder builder = new Retrofit.Builder()
.baseUrl("http://" + ADDRESS + ":" + PORT)
.addConverterFactory(GsonConverterFactory.create());
Retrofit retrofit = builder.build();
API locate = retrofit.create(API.class);
Call<MapDetails> call = locate.mapDetailLocation(data);
call.enqueue(new Callback<MapDetails>() {
#Override
public void onResponse(Call<MapDetails> call,
Response<MapDetails> response) {
String portString = String.valueOf(portss);
}
#Override
public void onFailure(Call call, Throwable t) {
Log.d("Message: ", "Data not sent, please check your
network connection.");
}
});
} catch (Exception e) {
Toast.makeText(NavDrawerFleet.this, "Disconnected from Internet, Please Configure Settings", Toast.LENGTH_SHORT).show();
restFailed();
}
}
}, 10000);
}
private void saving() {
//4SECOND
handler2 = new Handler();
handler2.postDelayed(new Runnable() {
#Override
public void run() {
DatabaseHelper databaseHelper = new DatabaseHelper(getApplicationContext());
SQLiteDatabase db = databaseHelper.getWritableDatabase();
well2 = String.valueOf(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss", java.util.Locale.getDefault()).format(new java.util.Date()));
boolean accepted = databaseHelper.saveLocationToLocalDatabase(gg, hidelat.getText().toString(), hidelon.getText().toString(), well2, "1", "9090", db);
failedCount.setText(String.valueOf(retryList.size()));
lat2 = hidelat.getText().toString();
lon2 = hidelon.getText().toString();
MapDetails mapDetails = new MapDetails(gg, hidelat.getText().toString(), hidelon.getText().toString(), well2, "1", 9090);
data.add(mapDetails);
retry2 = new NotSentModuleGetterSetter(hidelat.getText().toString(), hidelon.getText().toString(), well2);
retryList.add(retry2);
retrylist_adapter.notifyDataSetChanged();
if (accepted == true)
Log.w("Data Entered: ", "1st Copy");
}
}, 2000);
saving();
}
and this is my error encountered:
PS. I was wondering that my code is to totally not working though i want also other possible code implementation with this one, like asynctask to work with this multiple process + with threading in a single meathod.

For threading, please consider using RxJava. It would be as simple as this
Observable.fromCallable(new Callable<Object>() {
#Override public Object call() throws Exception {
saving();
return null;
}
})
.subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())
.subscribe(new Observer<Object>() {
#Override public void onSubscribe(Disposable d) {
}
#Override public void onNext(Object o) {
}
#Override public void onError(Throwable e) {
}
#Override public void onComplete() {
}
});
Check this link out on how to integrate RxJava into your project https://github.com/ReactiveX/RxAndroid

Unable to send post request with volley android like ajax

I have a problem with volley, I googled around for samples to upload the image
with volley, however, since I'm a beginner, I have a hard time trying to make my code that works in
ajax into android (Trying to do the eact same thing with volley). The following code is what I want to do with android
volley Multipart. Some tips or examples will be great. I would love to hear from you!
$.ajax({
type: 'post',
processData: false,
contentType: false,
data: "/imagepath/sample.PNG",
url: "https://linktotheimageuploader/upload",
async: true,
success: function (res) {
if (res.status == 0) {
console.log(res);
} else {
// NOP
}
}
, error: function () {
//failed to upload
}
});
I tried to convert it to Volley android like the following but I am unable to achieve what I want to do.
public void uploadImage(String url , final File fileName) {
final File encodedString = fileName;
RequestQueue rq = Volley.newRequestQueue(this);
Log.d("URL", url);
StringRequest stringRequest = new StringRequest(Request.Method.POST,
url, new Response.Listener<String>() {
#Override
public void onResponse(String response) {
try {
Log.e("RESPONSE", response);
JSONObject json = new JSONObject(response);
Toast.makeText(getBaseContext(),
"The image is upload" +response, Toast.LENGTH_SHORT)
.show();
} catch (JSONException e) {
Log.d("JSON Exception", e.toString());
Toast.makeText(getBaseContext(),
"Error while loadin data!",
Toast.LENGTH_LONG).show();
}
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
Log.d("ERROR", "Error [" + error + "]");
Toast.makeText(getBaseContext(),
"Cannot connect to server", Toast.LENGTH_LONG)
.show();
}
}) {
#Override
protected Map<String, String> getParams() {
Map<String, String> params = new HashMap<String, String>();
params.put(encodedString); // I want to set the file not a String,
return params;
}
};
rq.add(stringRequest);
}

First, To get callBack from the server in MultipartUploadRequest, create a class by extending the UploadServiceBroadcastReceiver
public class SingleUploadBroadcastReceiver extends UploadServiceBroadcastReceiver {
public interface Delegate {
void onProgress(int progress);
void onProgress(long uploadedBytes, long totalBytes);
void onError(Exception exception);
void onCompleted(int serverResponseCode, byte[] serverResponseBody);
void onCancelled();
}
private String mUploadID;
private Delegate mDelegate;
public void setUploadID(String uploadID) {
mUploadID = uploadID;
}
public void setDelegate(Delegate delegate) {
mDelegate = delegate;
}
#Override
public void onProgress(String uploadId, int progress) {
if (uploadId.equals(mUploadID) && mDelegate != null) {
mDelegate.onProgress(progress);
}
}
#Override
public void onProgress(String uploadId, long uploadedBytes, long totalBytes) {
if (uploadId.equals(mUploadID) && mDelegate != null) {
mDelegate.onProgress(uploadedBytes, totalBytes);
}
}
#Override
public void onError(String uploadId, Exception exception) {
if (uploadId.equals(mUploadID) && mDelegate != null) {
mDelegate.onError(exception);
}
}
#Override
public void onCompleted(String uploadId, int serverResponseCode, byte[] serverResponseBody) {
if (uploadId.equals(mUploadID) && mDelegate != null) {
mDelegate.onCompleted(serverResponseCode, serverResponseBody);
}
}
#Override
public void onCancelled(String uploadId) {
if (uploadId.equals(mUploadID) && mDelegate != null) {
mDelegate.onCancelled();
}
}
}
Then, in your activity:
public class YourActivity extends Activity implements SingleUploadBroadcastReceiver.Delegate {
private static final String TAG = "AndroidUploadService";
private final SingleUploadBroadcastReceiver uploadReceiver =
new SingleUploadBroadcastReceiver();
#Override
protected void onResume() {
super.onResume();
uploadReceiver.register(this);
}
#Override
protected void onPause() {
super.onPause();
uploadReceiver.unregister(this);
}
public void uploadMultipart(final Context context) {
try {
String uploadId = UUID.randomUUID().toString();
uploadReceiver.setDelegate(this);
uploadReceiver.setUploadID(uploadId);
new MultipartUploadRequest(context, uploadId, "http://upload.server.com/path")
.addFileToUpload("/absolute/path/to/your/file", "your-param-name")
.setNotificationConfig(new UploadNotificationConfig())
.setMaxRetries(2)
.startUpload();
} catch (Exception exc) {
Log.e(TAG, exc.getMessage(), exc);
}
}
#Override
public void onProgress(int progress) {
//your implementation
}
#Override
public void onProgress(long uploadedBytes, long totalBytes) {
//your implementation
}
#Override
public void onError(Exception exception) {
//your implementation
}
#Override
public void onCompleted(int serverResponseCode, byte[] serverResponseBody) {
//your implementation
}
#Override
public void onCancelled() {
//your implementation
}
}

I have done this with Volley in two different ways:
Sending the image as a Base64 encoded string
Sending the image as multipart
Sending it as encoded String
This method will encode a bitmap into a Base64 String which you can send as a parameter in your request. Then, the server can decode the String back to an image.
public String bitmapToString(Bitmap bmp){
ByteArrayOutputStream baos = new ByteArrayOutputStream();
bmp.compress(Bitmap.CompressFormat.JPEG, 100, baos);
byte[] imageBytes = baos.toByteArray();
String encodedImage = Base64.encodeToString(imageBytes, Base64.DEFAULT);
return encodedImage;
}
StringRequest stringRequest = new StringRequest(Request.Method.POST,
url, new Response.Listener<String>() {
#Override
public void onResponse(String response) {
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
}
}) {
#Override
protected Map<String, String> getParams() {
Map<String, String> params = new HashMap<String, String>();
params.put("image", bitmapToString(BitmapFactory.decodeFile(filePath)));
return params;
}
};
Sending it as Multipart
This is a little bit more tricky since you'll need to use custom classes made by some dude named anggadarkprince, but it's way faster than the first option
VolleyMultipartRequest multipartRequest = new VolleyMultipartRequest(Request.Method.POST, url, new Response.Listener<NetworkResponse>() {
#Override
public void onResponse(NetworkResponse response) {
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
}
}) {
#Override
protected Map<String, DataPart> getByteData() {
Map<String, DataPart> params = new HashMap<>();
RandomAccessFile f = null;
try {
f = new RandomAccessFile(filePath, "r");
} catch (FileNotFoundException e) {
e.printStackTrace();
return null;
}
byte[] b;
try {
b = new byte[(int)f.length()];
f.readFully(b);
} catch (IOException e) {
e.printStackTrace();
return null;
}
params.put("image", new DataPart("image.jpg", b, "image/jpeg"));
return params;
}
};
Here you'll find the class you need to do this.

Observable gives me size of a List null in onComplete()

I need to save in Realm a JSON that I've saved in Assets folder.
So I've decided to do it in this way:
private void putCountryIntoRealm()
{
Observable.create(new Observable.OnSubscribe<String>()
{
public void call(Subscriber<? super String> subscriber)
{
try
{
InputStream is = getActivity().getAssets().open("countries.json");
Reader inRead = new InputStreamReader(is);
Gson gson = new Gson();
JsonReader reader = new JsonReader(inRead);
reader.setLenient(true);
reader.beginArray();
while (reader.hasNext())
{
CountryObject ct = gson.fromJson(reader, CountryObject.class);
country.add(ct);
System.out.println("size ct: "+country.size());
subscriber.onNext(reader.toString());
}
reader.endArray();
reader.close();
subscriber.onCompleted();
}
catch (IOException e)
{
subscriber.onError(e);
}
}
}).subscribeOn(Schedulers.newThread())
.subscribe(new Subscriber<String>()
{
#Override
public void onCompleted()
{
getActivity().runOnUiThread(new Runnable()
{
#Override
public void run()
{
realm.executeTransactionAsync(new Realm.Transaction()
{
float total = 0;
float size = country.size();
String progressCount;
public void execute(Realm mRealm)
{
Countries countries = new Countries();
int i;
System.out.print("countries size: "+size);
for (i = 0; i < country.size(); i++)
{
total = (i/size * 100);
progressCount = String.format("%.0f",total);
countries.setId(country.get(i).getId());
countries.setCode(country.get(i).getCode());
countries.setName(country.get(i).getName());
countries.setContinent(country.get(i).getContinent());
countries.setKeywords(country.get(i).getKeywords());
countries.setWikipedia_link(country.get(i).getWikiLink());
mRealm.insertOrUpdate(countries);
getActivity().runOnUiThread(new Runnable()
{
#Override
public void run()
{
//Log.d("%",progressCount);
dialog = new ProgressDialog(getActivity());
dialog.setTitle("Salvataggio country in corso");
dialog.setMessage(progressCount+"%");
}
});
}
}
},new Realm.Transaction.OnSuccess() {
#Override
public void onSuccess()
{
Log.wtf("va","Ok");
if(dialog.isShowing())
dialog.dismiss();
}
}, new Realm.Transaction.OnError()
{
#Override
public void onError(Throwable error)
{
error.printStackTrace();
}
});
}
});
}
#Override
public void onError(Throwable e)
{
e.printStackTrace();
}
#Override
public void onNext(String s)
{
System.out.println(s);
}
});
}
but I have this error:
W/System.err: java.lang.NullPointerException: Attempt to invoke virtual method 'long com.plenitudesrls.aviocalc.helpful.CountryObject.getId()' on a null object reference
In fact, I print logs and the size in onNext() is 245, in onCompleted() is null.
Why I have this error? I have another case where this works good.
Thanks
EDIT: it works good, the problem was a MalformedJson that cause the crash

it's possible to add a percentage when I download with retrofit?

I've this code:
Retrofit retrofit = new Retrofit.Builder()
.addConverterFactory(GsonConverterFactory.create())
.addCallAdapterFactory(RxJavaCallAdapterFactory.create())
.baseUrl(GithubService.SERVICE_ENDPOINT).build();
GithubService service = retrofit.create(GithubService.class);
service.getAirport()
.subscribeOn(Schedulers.newThread())
.observeOn(AndroidSchedulers.mainThread())
.subscribe(new Subscriber<List<Airport>>() {
List<Airport> airps = new ArrayList<Airport>();
#Override
public void onCompleted() {
for(final Airport air : airps) {
realm.executeTransactionAsync(new Realm.Transaction() {
#Override
public void execute(Realm mRealm) {
AirportR airport = mRealm.createObject(AirportR.class);
airport.setId(air.getId());
}
}, new Realm.Transaction.OnSuccess() {
#Override
public void onSuccess() {
Log.wtf("ok", "ok");
}
}, new Realm.Transaction.OnError() {
#Override
public void onError(Throwable error) {
Log.e("ok", "non vaaa");
}
});
}
}
#Override
public void onError(Throwable e) {
e.printStackTrace();
}
#Override
public void onNext(List<Airport> airports) {
airps = airports;
}
});
}
});
and I need to put a download percentage because airports are so much..and so I want to put in a textview the percentage of the download (and I don't know how to do it in onNext() method) and the percentage of the realm adding in the airport...
It's possible to do?
Thanks

I used this function to show download progress, combine by rxjava and okhttp, hope it helps.
private void initOkHttpClient() {
mOkHttpClient = new OkHttpClient();
mRequest = new Request.Builder().url(URL_JSON).build();
}
private void rxPublishProgress() {
mProgressDialog = new ProgressDialog(this);
mProgressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
mProgressDialog.setMax(100);
mProgressDialog.setCancelable(true);
mProgressDialog.show();
mRequest = new Request.Builder().url(URL_IMAGE).build();
Observable.create(new Observable.OnSubscribe<String>() {
#Override
public void call(Subscriber<? super String> subscriber) {
try {
InputStream inputStream;
Response response = mOkHttpClient.newCall(mRequest).execute();
if (response.isSuccessful()) {
inputStream = response.body().byteStream();
long len = response.body().contentLength();
String progress = "0";
subscriber.onNext(progress);
byte[] data = new byte[1024];
long total = 0;
int count;
while ((count = inputStream.read(data)) != -1) {
total += count;
progress = String.valueOf(total * 100 / len);
subscriber.onNext(progress);
}
inputStream.close();
subscriber.onCompleted();
}
} catch (IOException e) {
e.printStackTrace();
}
}
}).subscribeOn(Schedulers.newThread()).subscribe(new Subscriber<String>() {
#Override
public void onCompleted() {
LogUtils.d("onCompleted");
mProgressDialog.dismiss();
}
#Override
public void onError(Throwable e) {
LogUtils.d(e.toString());
mProgressDialog.dismiss();
}
#Override
public void onNext(final String progress) {
runOnUiThread(new Runnable() {
#Override
public void run() {
mProgressDialog.setProgress(Integer.parseInt(progress));
}
});
}
});
}

SwipeToRefreshLayout Refreshing Function Won't Work Properly

To begin with, I checked literally every single SwipeToRefreshLayout question to solve this issue, but none worked for me. So I'm asking for your help to solve this issue.
I want the refresher to go away "once the refreshing is complete". What I tried so far either made it go away too early, or not go away at all. Here is the related code: (note that mSwipeRefreshLayout is already defined.)
private Handler handler = new Handler();
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ButterKnife.bind(this);
final double latitude = 39.9179;
final double longitude = 32.8627;
mSwipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
#Override
public void onRefresh() {
handler.post(refreshing);
getForecast(latitude, longitude);
}
});
getForecast(latitude, longitude);
}
private final Runnable refreshing = new Runnable(){
public void run(){
try {
if(mSwipeRefreshLayout.isRefreshing()){
handler.postDelayed(this, 500);
}else{
mSwipeRefreshLayout.setRefreshing(false);
}
}
catch (Exception e) {
e.printStackTrace();
}
}
};
and the data fetch function:
private void getForecast(double latitude, double longitude) {
String apiKey = "7d22cdb138cd70f2e9e8d2006cd0461c";
String forecastUrl = "https://api.forecast.io/forecast/" + apiKey
+ "/" + latitude + "," + longitude;
if (isNetworkAvailable()){
OkHttpClient client = new OkHttpClient();
Request request = new Request.Builder().url(forecastUrl).build();
Call call = client.newCall(request);
call.enqueue(new Callback() {
#Override
public void onFailure(Request request, IOException e) {
alertUserAboutError();
}
#Override
public void onResponse(Response response) throws IOException {
try {
String jsonData = response.body().string();
Log.v(TAG, jsonData);
if (response.isSuccessful()) {
mCurrentWeather = getCurrentDetails(jsonData);
runOnUiThread(new Runnable() {
#Override
public void run() {
updateDisplay();
}
});
} else {
alertUserAboutError();
}
} catch (IOException e) {
Log.e(TAG, "Exception caught: ", e);
} catch (JSONException e) {
Log.e(TAG, "Exception caught: ", e);
}
}
});
}
else {
Toast.makeText(this, "Network is unavailable!", Toast.LENGTH_LONG).show();
}
}

swipeContainer = (SwipeRefreshLayout) v.findViewById(R.id.swipeContainer);
swipeContainer.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
#Override
public void onRefresh() {
getForecast(latitude, longitude); //call ur function here
swipeContainer.setRefreshing(false);
}
});