I am trying to download content of some random web content to my Logcat. I already did this many time but now I am getting only 2020-05-17 13:24:20.850 24632-24632/com.example.jsondownload I/Rezultat URLa:: { and nothing else.Content is some random JSON small sample and I want to show it in my logcat, and nothing else.
I added internet permission.
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
String string = "https://api.openweathermap.org/data/2.5/weather?q=London,uk&appid=6...3";
DownloadAsync downloadAsync = new DownloadAsync();
downloadAsync.execute(string);
}
public static class DownloadAsync extends AsyncTask<String,Void,String> {
#Override
protected String doInBackground(String... strings) {
StringBuilder rezultat = new StringBuilder();
URL url;
HttpURLConnection httpURLConnection;
try {
url = new URL(strings[0]);
httpURLConnection = (HttpURLConnection) url.openConnection();
InputStream inputStream = httpURLConnection.getInputStream();
InputStreamReader inputStreamReader = new InputStreamReader(inputStream);
int podaci = inputStreamReader.read();
while (podaci!=-1){
char trenutnoSlovoKojeSeCita = (char) podaci;
rezultat.append(trenutnoSlovoKojeSeCita);
podaci = inputStream.read();
}
return rezultat.toString();
}
catch (Exception e){
e.printStackTrace();
return "Neuspesno";
}
}
#Override
protected void onPostExecute(String s) {
super.onPostExecute(s);
Log.i("Rezultat URLa: ",s);
}
}
}
I find a solution: I added BufferReader:
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
String string = "https://api.openweathermap.org/data/2.5/weather?q=Belgrade&appid=6c5022949de1b8e8448bc7232238dcf3";
DownloadAsync downloadAsync = new DownloadAsync();
downloadAsync.execute(string);
}
public static class DownloadAsync extends AsyncTask<String,Void,String> {
#Override
protected String doInBackground(String... strings) {
StringBuilder rezultat = new StringBuilder();
URL url;
HttpURLConnection httpURLConnection;
try {
url = new URL(strings[0]);
httpURLConnection = (HttpURLConnection) url.openConnection();
InputStream inputStream = httpURLConnection.getInputStream();
InputStreamReader inputStreamReader = new InputStreamReader(inputStream, Charset.forName("UTF-8"));
BufferedReader reader = new BufferedReader(inputStreamReader);
String line = reader.readLine();
while (line!=null){
rezultat.append(line);
line = reader.readLine();
}
return rezultat.toString();
}
catch (Exception e){
e.printStackTrace();
return "Neuspesno " ;
}
}
#Override
protected void onPostExecute(String rezultat) {
super.onPostExecute(rezultat);
try {
JSONObject jsonObject = new JSONObject(rezultat);
String weatherInfo = jsonObject.getString("weather");
JSONArray arr = new JSONArray(weatherInfo);
for (int i = 0; i < arr.length();i++){
JSONObject jsonObject1 = arr.getJSONObject(i);
String main = jsonObject1.getString("main");
String desc = jsonObject1.getString("description");
Log.i("main: ",main);
Log.i("description: ",desc);
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}
}
Related
In my code i had caught data from a JSON file,
I executed the program, it stopped but didn't crash.
i've tried to change json file. I found one that is Smaller than the first one and so the program works.
this JSON file is made of data o premier legue(England) and contain 3 mainly data, the name, a key and a code of the squads.
public class MainActivity extends AppCompatActivity {
private ProgressDialog caric;
private String TAG = MainActivity.class.getSimpleName();
public ArrayMap<Integer, Valori> ArrayDati = new ArrayMap<>();
Button buttonProg;
TextView textViewProg;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
buttonProg = (Button) findViewById(R.id.button);
textViewProg = (TextView) findViewById(R.id.textView);
buttonProg.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
new JsonCLASS().execute("https://raw.githubusercontent.com/openfootball/football.json/master/2015-16/en.1.clubs.json");
}
});
}
private class JsonCLASS extends AsyncTask<String, String, String> {
#Override
protected void onPreExecute() {
super.onPreExecute();
caric = new ProgressDialog(MainActivity.this);
caric.setMessage("Please wait");
caric.setCancelable(false);
caric.show();
}
#Override
protected String doInBackground(String... params) {
HttpURLConnection connection = null;
BufferedReader reader = null;
try {
URL url = new URL(params[0]);
connection = (HttpURLConnection) url.openConnection();
connection.connect();
InputStream stream = connection.getInputStream();
reader = new BufferedReader(new InputStreamReader(stream));
StringBuffer buffer = new StringBuffer();
String line = "";
while ((line = reader.readLine()) != null) {
buffer.append(line + "\n");
Log.d("Response: ", "> " + line);
}
return buffer.toString();
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
if (connection != null) {
connection.disconnect();
}
try {
if (reader != null) {
reader.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
return null;
}
#Override
protected void onPostExecute(String result) {
super.onPostExecute(result);
try {
JSONObject jsonObject = new JSONObject(result);
JSONArray Arr = new JSONArray(jsonObject.getString("clubs"));
for (int i = 0; i < Arr.length(); i++){
JSONObject jsonPart = Arr.getJSONObject(i);
ArrayDati.put(i,new Valori( jsonPart.getString("key"), jsonPart.getString("name"), jsonPart.getString("code")));
textViewProg.setText(textViewProg.getText()+"key : "+ ArrayDati.get(i).Key
+"\n"+textViewProg.getText()+"name : "+ ArrayDati.get(i).Name
+"\n"+textViewProg.getText()+"code : "+ ArrayDati.get(i).Code );
}
} catch (Exception e ){
e.printStackTrace();
}
if (caric.isShowing()) {
caric.dismiss();
}
}
}
}
And a class to pass the data
public class Valori {
String Key;
String Name;
String Code;
public Valori(String key, String name, String code) {
this.Key = key;
this.Name = name;
this.Code = code;
}
}
With this code the application stops but it doesn't close.
I did the code in android to retrieve records from website url. But I am stuck in receiving the result in string variable.
I want to display received values in receiveddata variable. Please help me on this..
I did this code:
Main2Activity.java
btnsync.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
String receiveddata="";
Toast.makeText(getApplicationContext(), "Syncing data...",Toast.LENGTH_SHORT).show();
SyncLoginData process = new SyncLoginData();
process.execute();
Toast.makeText(getApplicationContext(), "Data synced successfully....",Toast.LENGTH_SHORT).show();
}
});
SyncLoginData.java
public class SyncLoginData extends AsyncTask<Void, Void, Void> {
String data="";
String dataParsed = "";
DatabaseHelper mydb;
String singleParsed ="";
#Override
protected Void doInBackground(Void... voids) {
try
{
URL url = new URL("https://api.myjson.com/bins/1034t9");
HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
InputStream inputStream = httpURLConnection.getInputStream();
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
String line = "";
while(line != null){
line = bufferedReader.readLine();
data = data + line;
}
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
#Override
protected void onPostExecute(Void aVoid) {
super.onPostExecute(aVoid);
Main2Activity.data.setText(this.data);
}
}
Try this instead.
public class SyncLoginData extends AsyncTask<Void, Void, String> {
#Override
protected Void doInBackground(Void... voids) {
String data;
try {
URL url = new URL("https://api.myjson.com/bins/1034t9");
HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
InputStream inputStream = httpURLConnection.getInputStream();
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
String line = "";
while (line != null) {
line = bufferedReader.readLine();
data = data + line;
}
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return data;
}
#Override
protected void onPostExecute(String data) {
Main2Activity.data.setText(data);
}
}
AsyncResponse.java:
public interface AsyncResponse {
void ProcessFinish(String Output);
}
AsyncResponseSecond.java:
public interface AsyncResponseSecond {
void ProcessFinishSecond(String Output);
}
This is for Asynctask OnPostExecute to get the result and save it in TextView.
I want to Know if the method which I am Using is correct or not . I am not getting the response
Asyncresponse is for one button and AsyncresponseSecond is for other Button
IntimeWorker.java:
public class InTImeWorker extends AsyncTask<String, Void, String> {
Context context;
AlertDialog alertDialog;
public AsyncResponse delegate = null;
InTImeWorker(Context ctx) {
context = ctx;
}
#Override
protected void onPreExecute() {
alertDialog = new AlertDialog.Builder(context).create();
alertDialog.setTitle("In Time Status !");
}
#Override
protected void onPostExecute(String result) {
delegate.ProcessFinish(result);
}
#Override
protected String doInBackground(String... params) {
String Emp_id = params[0];
String in_time_url = "http://192.168.0.107/RTOS/intime.php";
try {
URL url = new URL(in_time_url);
HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
httpURLConnection.setRequestMethod("POST");
httpURLConnection.setDoOutput(true);
httpURLConnection.setDoInput(true);
OutputStream outputStream = httpURLConnection.getOutputStream();
BufferedWriter bufferedWriter = new BufferedWriter(new OutputStreamWriter(outputStream, "UTF-8"));
String post_data = URLEncoder.encode("emp_id", "UTF-8") + "=" + URLEncoder.encode(Emp_id, "UTF-8");
bufferedWriter.write(post_data);
bufferedWriter.flush();
bufferedWriter.close();
outputStream.close();
InputStream inputStream = httpURLConnection.getInputStream();
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream, "iso-8859-1"));
String result = "";
String line = "";
while ((line = bufferedReader.readLine()) != null) {
result += line;
}
bufferedReader.close();
inputStream.close();
httpURLConnection.disconnect();
return result;
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
}
OuttimeWorker.java:
public class OutTimeWorker extends AsyncTask<String,Void,String> {
Context context;
AlertDialog alertDialog;
public AsyncResponseSecond delegate = null;
OutTimeWorker(Context ctx){
context = ctx;
}
#Override
protected void onPreExecute() {
alertDialog = new AlertDialog.Builder(context).create();
alertDialog.setTitle("Out Time Status !");
}
#Override
protected void onPostExecute(String result) {
delegate.ProcessFinishSecond(result);
}
#Override
protected String doInBackground(String... params) {
String Emp_id = params[0];
String out_time_url = "http://192.168.0.107/RTOS/outtime.php";
try {
URL url = new URL(out_time_url);
HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
httpURLConnection.setRequestMethod("POST");
httpURLConnection.setDoOutput(true);
httpURLConnection.setDoInput(true);
OutputStream outputStream = httpURLConnection.getOutputStream();
BufferedWriter bufferedWriter = new BufferedWriter(new OutputStreamWriter(outputStream, "UTF-8"));
String post_data = URLEncoder.encode("emp_id","UTF-8")+"="+URLEncoder.encode(Emp_id,"UTF-8");
bufferedWriter.write(post_data);
bufferedWriter.flush();
bufferedWriter.close();
outputStream.close();
InputStream inputStream = httpURLConnection.getInputStream();
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream,"iso-8859-1"));
String result = "";
String line = "";
while ((line = bufferedReader.readLine())!= null){
result += line;
}
bufferedReader.close();
inputStream.close();
httpURLConnection.disconnect();
return result;
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
}
EmployeeActivity.java:
public class EmployeeActivity extends AppCompatActivity implements AsyncResponse , AsyncResponseSecond {
TextView name, In_time, Out_time;
SharedPreferences sp,sp1;
Button in_time_button, out_time_button;
private static final String KEY_IN_TIME_TEXTVIEW = "intimetextview_key";
private static final String KEY_OUT_TIME_TEXTVIEW = "outtimetextview_key";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_employee);
name = findViewById(R.id.text_name);
sp = getSharedPreferences("attendlogin", MODE_PRIVATE);
String emp_name = sp.getString("name", null);
name.setText(emp_name);
in_time_button = findViewById(R.id.buttonlogin);
out_time_button = findViewById(R.id.buttonlogout);
out_time_button.setEnabled(false);
In_time = findViewById(R.id.text_in_time);
Out_time = findViewById(R.id.text_out_time);
public void OnAttendLogin(View view) {
sp = getSharedPreferences("attendlogin", MODE_PRIVATE);
String emp_id = sp.getString("emp_id", null);
InTImeWorker inTImeWorker = new InTImeWorker(this);
inTImeWorker.delegate = (AsyncResponse) this;
inTImeWorker.execute(emp_id);
//shared pref for saving In_time in textview
sp1 = getSharedPreferences("InTime", MODE_PRIVATE);
SharedPreferences.Editor editor1 = sp1.edit();
String in_time_sharedpref = In_time.getText().toString();
editor1.putString("in_time_sp", in_time_sharedpref);
editor1.apply();
editor1.commit();
out_time_button.setEnabled(true);
in_time_button.setEnabled(false);
}
public void OnLogout(View view) {
sp = getSharedPreferences("attendlogin", MODE_PRIVATE);
String emp_id = sp.getString("emp_id", null);
OutTimeWorker outTimeWorker = new OutTimeWorker(this);
outTimeWorker.delegate = (AsyncResponseSecond) this;
outTimeWorker.execute(emp_id);
out_time_button.setEnabled(false);
in_time_button.setEnabled(false);
}
#Override
public void ProcessFinish(String Output) {
In_time.setText(Output);
}
#Override
public void ProcessFinishSecond(String Output) {
Out_time.setText(Output);
}}
Do it like this
CallAPI asyncTask = new CallAPI(getContext());
CallAPI asyncTask2 = new CallAPI(getContext());
final chat text = this;
sendb.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
try {
String data = null;
//data to send
CallAPI asyncTask = new CallAPI(getContext());
asyncTask.delegate = text;
asyncTask.execute("", data, "sendMsg");
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
}
sendb2.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
try {
String data = null;
//data to send
CallAPI asyncTask2 = new CallAPI(getContext());
asyncTask2.delegate = text;
asyncTask2.execute("", data, "sendMsg");
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
}
});
#Override
public void onTaskCompleted(String output, String output2) {
}
This question already has answers here:
FileNotFoundException while getting the InputStream object from HttpURLConnection
(8 answers)
Closed 6 years ago.
My code to that sends JSON over the network works until OutputStream is invoked, but when I try actually sending the data, I get the following exception. Can anyone help me figure it out?
java.io.FileNotFoundException: http://hmkcode.appspot.com/jsonservlet
at
com.android.okhttp.internal.huc.HttpURLConnectionImpl.getInputStream(HttpURLConnectionImpl.java:238)
at app.test.testapp2.MainActivity$HttpAsyncTask.doInBackground(MainActivity.java:84)
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
button = (Button) findViewById(R.id.accept);
textView = (TextView) findViewById(R.id.textView);
editName = (EditText) findViewById(R.id.editName);
editCountry = (EditText) findViewById(R.id.editCountry);
editTwitter = (EditText) findViewById(R.id.editTwitter);
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
HttpAsyncTask httpAsyncTask = new HttpAsyncTask(MainActivity.this);
httpAsyncTask.execute("http://hmkcode.appspot.com/jsonservlet", editName.getText().toString(), editCountry.getText().toString(), editTwitter.getText().toString());
}
});
}
private class HttpAsyncTask extends AsyncTask<String, Void, String> {
private MainActivity mainActivity;
String result = "";
HttpAsyncTask(MainActivity mainActivity) {
this.mainActivity = mainActivity;
}
#Override
protected String doInBackground(String... strings) {
Person person = new Person();
person.setName(strings[1]);
person.setCountry(strings[2]);
person.setTwitter(strings[3]);
try {
URL url = new URL(strings[0]);
HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
String json = "";
JSONObject jsonObject = new JSONObject();
jsonObject.accumulate("name", "!!!");
jsonObject.accumulate("country", "###");
jsonObject.accumulate("twitter", "####");
json = jsonObject.toString();
httpURLConnection.setRequestMethod("POST");
httpURLConnection.setDoOutput(true);
httpURLConnection.setDoInput(true);
httpURLConnection.setRequestProperty("Accept", "application/json");
httpURLConnection.setRequestProperty("content-type", "application/json");
InputStream is = httpURLConnection.getInputStream();
OutputStream os = httpURLConnection.getOutputStream();
os.write(json.getBytes("utf-8"));
os.flush();
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(is));
String line = "";
while ((line = bufferedReader.readLine()) != null) {
result += line;
}
is.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
return result;
}
#Override
protected void onPostExecute(String result) {
str = result;
mainActivity.runOnUiThread(new Runnable() {
#Override
public void run() {
try {
JSONArray jsonArray = new JSONArray(str);
mainActivity.textView.setText(jsonArray.toString());
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
}
}
W/System.err: java.io.FileNotFoundException: http://hmkcode.appspot.com/jsonservlet
W/System.err: at com.android.okhttp.internal.huc.HttpURLConnectionImpl.getInputStream(HttpURLConnectionImpl.java:238)
W/System.err: at app.test.testapp2.MainActivity$HttpAsyncTask.doInBackground(MainActivity.java:84)
.....
This is equivalent to HTTP status 404 - Not Found.
I am trying to display main and description from json data i take from opneweathermap. And nothing happen, but I don't have errors.
I will not include the link.
Here is my MainActivity class
public class MainActivity extends AppCompatActivity {
private Button mButton;
private TextView mTextView;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mButton = (Button) findViewById(R.id.button);
mTextView = (TextView) findViewById(R.id.textView2);
mButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
DownloadTask task = new DownloadTask();
task.execute("Link");
}
});
}
public class DownloadTask extends AsyncTask<String, Void, String> {
#Override
protected String doInBackground(String... urls) {
String result = "";
URL url;
HttpURLConnection urlConnection = null;
try {
url = new URL(urls[0]);
urlConnection = (HttpURLConnection) url.openConnection();
InputStream inputStream = urlConnection.getInputStream();
InputStreamReader inputStreamReader = new InputStreamReader(inputStream);
int data = inputStreamReader.read();
while(data != -1){
char current = (char) data;
result+=current;
data = inputStreamReader.read();
}
return result;
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
#Override
protected void onPostExecute(String result) {
super.onPostExecute(result);
try {
String message = "";
JSONObject jsonObject = new JSONObject(result);
String weatherInfo = jsonObject.getString("weather");
Toast.makeText(getApplicationContext(), "Soem"+message,Toast.LENGTH_LONG).show();
Log.i("Weather content", weatherInfo);
JSONArray array = new JSONArray(weatherInfo);
for(int i=0;i<array.length();i++){
JSONObject jsonPart = array.getJSONObject(i);
String main = "";
String description = "";
main = jsonPart.getString("main");
description = jsonPart.getString("description");
if(main != "" && description != ""){
message += main + ": " + description + "\r\n";
}
}
if(message != ""){
mTextView.setText(message);
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}
}
I have included uses-permissions and i have TextView and Button that will display the data from json in my layout file.