I am New to the android studio and want to something more. Actually, I am trying to pass the string that I got from the spinner in onCreateMethod and pass to the onPostExecute function. I will be grateful for the help. Bellow is my code.
I tried making a global variable called First and store the string from spinner and pass it on the onPostExecute function.
public class Convert extends AppCompatActivity implements LocationListener
{
Spinner dropdown;
Button btn;
String text;
String first;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_convert);
dropdown = (Spinner) findViewById(R.id.spinner1);
btn = (Button)findViewById(R.id.btn);
String[] items = new String[]{"United States,USD", "Nepal,NPR", "Bangladesh,BDT","Brazil,BRL"};
ArrayAdapter<String> adapter = new ArrayAdapter<>(this, android.R.layout.simple_spinner_dropdown_item, items);
dropdown.setAdapter(adapter);
btn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
text = dropdown.getSelectedItem().toString();
first = text.substring(text.length()-3);
Log.i("her", first);
}
});
new DownloadTask().execute("http://openexchangerates.org/api/latest.json?
app_id=XXXXXXXXXX");
}
public class DownloadTask extends AsyncTask<String, Void, String> {
#Override
protected String doInBackground(String... urls) {
String result = "";
URL url;
HttpURLConnection httpURLConnection = null;
try {
url = new URL(urls[0]);
httpURLConnection = (HttpURLConnection) url.openConnection();
InputStream in = httpURLConnection.getInputStream();
InputStreamReader reader = new InputStreamReader(in);
int data = reader.read();
while (data != -1) {
char counter = (char) data;
result += counter;
data = reader.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{
JSONObject jsonObject = new JSONObject(result);
JSONObject curr = jsonObject.getJSONObject("rates");
String npr = curr.getString(first);
Log.i("money", npr );
} catch (JSONException e) {
e.printStackTrace();
}
}
}
What I want is to pass the string first on the onPostExecute function.
When you will call your DownloadTask, asyncTask fires with method execute, just pass param though him. Example:
How to pass url
new DownloadTask().execute("url for download");
How to receive url
protected String doInBackground(String... urls) {
String url = urls[0]; // url for download
}
Also you could send and array of params. Also be careful with AsyncTask, do not pass your context/view variable, it could arise memory leaks, read docs.
So I have been trying to make a feature in my app where I can login and then fetch data from my database through the Django REST Framework. My logging in works as it only uses POST, but retrieving items does not work.
For some reason my AsyncTask does not get called for retrieving posts.
I have placed my AsyncTask for both activities, which are login and posts, on a separate java file only for handling Web Server stuff.
I am wondering if this is because I should put AsyncTask on each activities.
login.java
public class Login extends AppCompatActivity {
Button LoginButton;
EditText uUserName, uPassWord;
WSAdapter.SendAPIRequests AuthHelper;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
//SetupHomeBtn = (ImageButton) findViewById(R.id.SetupHomeBtn);
LoginButton = (Button) findViewById(R.id.LoginButton);
uUserName = (EditText) findViewById(R.id.LoginUserBox);
uPassWord = (EditText) findViewById(R.id.LoginPassBox);
//AuthHelper = new WSAdapter().new SendDeviceDetails();
// Moves user to the main page after validation
LoginButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// gets the username and password from the EditText
String strUserName = uUserName.getText().toString();
String strPassWord = uPassWord.getText().toString();
// API url duh
String APIUrl = "http://192.168.0.18:8000/token-auth/";
// If the user is authenticated, then transfer to the MainActivity page
if (APIAuthentication(strUserName, strPassWord, APIUrl)){
startActivity(new Intent(Login.this, Posts.class));
}
}
});
}
private boolean APIAuthentication(String un, String pw, String url){
// when it wasn't static -> AuthHelper = new WSAdapter().new SendAPIRequests();
AuthHelper = new WSAdapter.SendAPIRequests();
JSONObject postData = new JSONObject();
try {
// Attempt to input info to the Django API
postData.put("username", un);
postData.put("password", pw);
// Putting the data to be posted in the Django API
AuthHelper.execute(url, postData.toString());
return true;
} catch (JSONException e) {
e.printStackTrace();
}
return false;
}
}
posts.java
public class Posts extends AppCompatActivity {
TextView postsSect;
Button postsDoneBtn;
WSAdapter.SendAPIRequests PostsHelper;
StringBuilder postsBuffer = new StringBuilder();
#Override
protected void onResume(){
super.onResume();
PostsDetails postDetailsHelper = new PostsDetails();
postDetailsHelper.ListPosts();
}
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_posts);
PostsDetails postDetailsHelper = new PostsDetails();
postsDoneBtn = (Button) findViewById(R.id.PostsDoneButton);
postDetailsHelper.callPostDetails("192.168.0.18:8000/api");
postDetailsHelper.ListPosts();
postDetailsHelper.postDetailsCalled('n');
postsDoneBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
startActivity(new Intent(Posts.this, MainActivity.class));
}
});
}
public class PostsDetails {
//String post_title, post_content;
ArrayList<Integer> post_id = new ArrayList<Integer>();
ArrayList<String> post_title = new ArrayList<String>();
ArrayList<String> post_content = new ArrayList<String>();
boolean isPDCalled;
// sets if Post details are called
boolean postDetailsCalled(char called) {
if (called == 'y'){
return true;
}
return false;
}
// checks if postsDetails functions are called for AsyncTask
boolean getIsPDCalled(){
return isPDCalled;
}
// calls the execute for AsyncTask
private void callPostDetails(String theurl){
PostsHelper = new WSAdapter.SendAPIRequests();
// sets if post details are called
postDetailsCalled('y');
// executes AsyncTask
PostsHelper.execute(theurl);
}
// sets values for the posts arrays
public void setPost(int p_id, String p_title, String p_content) {
post_id.add(p_id);
post_title.add(p_title);
post_content.add(p_content);
}
// Lists the posts from the database
public void ListPosts() {
/////////// add functionality if a post was deleted and was clicked
postsSect = (TextView) findViewById(R.id.PostsSection);
postsSect.setText(post_title.get(post_title.size()) + "\n");
for (int i = post_id.size() - 1; i > 0; i--)
{
postsSect.append(post_title.get(i));
}
}
}
}
WSAdapter.java
// I forgot what WS stands for, but this class serves as an adapter for JSON and Online stuff
// I think it stands for With-Server Adapter
public class WSAdapter extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
static public class SendAPIRequests extends AsyncTask<String, String, String> {
// Add a pre-execute thing
#Override
protected String doInBackground(String... params) {
Log.e("TAG", params[0]);
Log.e("TAG", params[1]);
String data = "";
HttpURLConnection httpURLConnection = null;
try {
// Sets up connection to the URL (params[0] from .execute in "login")
httpURLConnection = (HttpURLConnection) new URL(params[0]).openConnection();
// Sets the request method for the URL
httpURLConnection.setRequestMethod("POST");
// Tells the URL that I am sending a POST request body
httpURLConnection.setDoOutput(true);
// To write primitive Java data types to an output stream in a portable way
DataOutputStream wr = new DataOutputStream(httpURLConnection.getOutputStream());
// Writes out a byte to the underlying output stream of the data posted from .execute function
wr.writeBytes("postData=" + params[1]);
// Flushes the postData to the output stream
wr.flush();
wr.close();
// Representing the input stream
InputStream in = httpURLConnection.getInputStream();
// Preparing input stream bytes to be decoded to charset
InputStreamReader inputStreamReader = new InputStreamReader(in);
StringBuilder dataBuffer = new StringBuilder();
// Translates input stream bytes to charset
int inputStreamData = inputStreamReader.read();
while (inputStreamData != -1) {
char current = (char) inputStreamData;
inputStreamData = inputStreamReader.read();
// concatenates data characters from input stream
dataBuffer.append(current);
}
data = dataBuffer.toString();
} catch (Exception e) {
e.printStackTrace();
} finally {
// Disconnects socket after using
if (httpURLConnection != null) {
httpURLConnection.disconnect();
}
}
Log.e("TAG", data);
return data;
}
#Override
protected void onPostExecute(String result) {
super.onPostExecute(result);
// expecting a response code fro my server upon receiving the POST data
Log.e("TAG", result);
Posts.PostsDetails postsHelper = new Posts().new PostsDetails();
// For posts
try {
if (postsHelper.getIsPDCalled()){
JSONObject pJObj = new JSONObject(result);
JSONArray pJObjArray = pJObj.getJSONArray("posts");
for (int i = 0; i < pJObjArray.length(); i++) {
JSONObject pJObj_data = pJObjArray.getJSONObject(i);
postsHelper.setPost(pJObj_data.getInt("id"), "post_title", "post_content");
}
}
} catch (JSONException e) {
//Toast.makeText(JSonActivity.this, e.toString(), Toast.LENGTH_LONG).show();
Log.d("Json","Exception = "+e.toString());
}
}
}
}
Yes, you can and should put the network calls functions in a separate java file for better readability and test-coverage.
Apart from that, i would suggest to use Retrofit as your HTTP client. It helps you to manage all the dirty things like headers and converters etc, so you can put all your effort on your logic and implementing your callback actions.
I have an Activity that uses a ListView to display an array of data fetched from a JSON response. Clicking on one of the items will present the user with a business card activity, displaying the data associated with the item clicked. When the application first loads, it works fine. I can close the business card and reopen it multiple times. However, if i pause on the ListView activity, the page will no longer load the data. I have placed Log.d commands before and after the connection to try debugging the issue. The activity is receiving the information necessary to perform the connection. However, the closest I have gotten to a solution is knowing that when it doesn't work, I cannot Log.d the response code immediately after opening the connection.
To be clear, I am including the entirety of the code I am using, just in case the issue lies somewhere else. First is the code for the ListView Activity, then is the Business Card Activity code.
This is the Directory Activity.
public class DirectoryActivity extends AppCompatActivity {
ListView lvContacts;
Button goMenu;
Button goFilter;
TextView tempText;
static ArrayList<String> arrlst = new ArrayList<>();
static ArrayAdapter<String> adapter;
private FetchList process;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_directory);
lvContacts = findViewById(R.id.lvContacts);
goMenu = findViewById(R.id.btn_goMenu);
goFilter = findViewById(R.id.btn_goSearch);
tempText = findViewById(R.id.temptext);
// Set adapter for listview: used in FetchList
adapter = new ArrayAdapter<>(this, R.layout.layout_org_list, R.id.listViewItem, arrlst );
lvContacts.setAdapter(adapter);
// Get list from DB
process = new FetchList();
process.setListener(new FetchList.FetchListTaskListener() {
#Override
public void onFetchListTaskFinished(String[] result) {
// update UI in Activity here
arrlst.clear();
for (String OrgName:result) {
addItemsToList(OrgName);
}
adapter.notifyDataSetChanged();
}
});
process.execute();
// Set onclick listener for listview
lvContacts.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> adapterView, View view, int position, long l) {
String selectedOrg = lvContacts.getItemAtPosition(position).toString(); // Get org name from list view
goBusinessCard(selectedOrg); // Go to business card
}
});
}
#Override
protected void onDestroy() {
process.setListener(null); // PREVENT LEAK AFTER ACTIVITY DESTROYED
super.onDestroy();
}
public static void addItemsToList(String item) {
arrlst.add(item);
}
// Set Methods for Buttons
public void goMenu(View v) {
startActivity(new Intent(this, HomeActivity.class));
}
public void goFilter(View v) {
startActivity(new Intent(this, FilterActivity.class));
Log.d("FILTER DEBUG", "checking if extras are filled " + this.getIntent().getExtras());
}
// Method for opening BusinessCardActivity and passes orgID
public void goBusinessCard(String selectedOrg) {
Bundle extras = new Bundle();
extras.clear();
extras.putString("selectedOrg", selectedOrg);
Intent BusinessCard = new Intent(this, BusinessCardActivity.class);
BusinessCard.putExtras(extras);
startActivity(BusinessCard);
}
// ASYNC TASK
static class FetchList extends AsyncTask<Void, Void, String[]> {
private FetchListTaskListener listener;
#Override
protected String[] doInBackground(Void... voids) {
try {
URL url = new URL(URL_READ_ORG ); // Set url to API Call location
HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection(); // Open connection to html
InputStream inputStream = httpURLConnection.getInputStream(); // create input stream from html location
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream, "utf-8")); // create reader for inputStream
StringBuilder data = new StringBuilder();
String line;
while ((line = bufferedReader.readLine()) != null ) {
data.append(line); // creates string from all lines in response
}
bufferedReader.close();
inputStream.close();
httpURLConnection.disconnect();
JSONObject JO = new JSONObject(data.toString()); // creates object from json response in data string
JSONArray JA = JO.getJSONArray("orgs");
// Create array list to store items from json response
List<String> al_orgList = new ArrayList<>();
// Iterate through JSON array to get json object org_name
for (int i = 0; i < JA.length(); i++) {
JSONObject Orgs = JA.getJSONObject(i);
String org_name = Orgs.getString("org_name");
al_orgList.add(org_name);
}
// convert array list to array
return al_orgList.toArray(new String[al_orgList.size()]);
} catch (JSONException | IOException e) {
e.printStackTrace();
}
return null;
}
// UI Process - allows manipulation of UI
#Override
protected void onPostExecute(String[] result) {
super.onPostExecute(result);
if (listener != null) {
listener.onFetchListTaskFinished(result);
}
}
private void setListener(FetchListTaskListener listener) {
this.listener = listener;
}
public interface FetchListTaskListener {
void onFetchListTaskFinished(String[] result);
}
}
This is the Business Card Activity that runs the data fetch for individual items
public class BusinessCardActivity extends AppCompatActivity {
TextView tv_org, tv_name, tv_email, tv_phone, tv_website, tv_servicetype,
tv_servicesprovided, tv_address;
String Favorite, Latitude, Longitude, selectedOrg, FavoriteChanged, dbPhone, phoneNum, dbWeb, orgWeb;
CheckBox cbFavorite;
List<String> arrlstID = new ArrayList<>();
String[] arrID;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_business_card);
// Assign fields to variables
tv_org = findViewById(R.id.tv_org);
tv_name = findViewById(R.id.tv_name);
tv_email = findViewById(R.id.tv_email);
tv_phone = findViewById(R.id.tv_phone);
tv_website = findViewById(R.id.tv_website);
tv_servicetype = findViewById(R.id.tv_servicetype);
tv_servicesprovided = findViewById(R.id.tv_servicesprovided);
tv_address = findViewById(R.id.tv_address);
cbFavorite = findViewById(R.id.cbFavorite);
// Set variable for selectedOrg from DirectoryActivity
selectedOrg = Objects.requireNonNull(this.getIntent().getExtras()).getString("selectedOrg");
// Get Org data from DB using async
process = new FetchOrg();
process.setListener(new FetchOrg.FetchOrgTaskListener() {
#Override
public void onFetchOrgTaskFinished(String[] result) {
setTextView(result);
// onClick for Email
tv_email.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v)
{
showEmailDialog();
}
});
// onClick for Call
tv_phone.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// TODO Get phone number from DB
// Replace any non-digit in phone number to make call
phoneNum = dbPhone.replaceAll("\\D", "");
// make call
goCall(phoneNum);
}
});
// onClick for Web
tv_website.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// TODO Fix URL logic
orgWeb = "http://" + dbWeb;
goWeb(orgWeb);
}
});
// onClick for Address
tv_address.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
goMap();
}
});
// TODO add favorite functionality
// When checkbox status changes, change value of Favorite
cbFavorite.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
}
});
}
});
process.execute(selectedOrg);
/*
// if favorite = 1 then check box
if (Favorite.equals("1")) {
cbFavorite.setChecked(true);
} else {
cbFavorite.setChecked(false);
}
*/
}
#Override
protected void onDestroy() {
process.setListener(null); // PREVENT LEAK AFTER ACTIVITY DESTROYED
super.onDestroy();
}
// Method to assign text view items from async task
public void setTextView(String[] org_data) {
String name = org_data[1] + " " + org_data[2];
String address = org_data[8] + " " + org_data[9] + " " + org_data[10] + " " + org_data[11];
tv_org.setText(org_data[0]);
tv_name.setText(name);
tv_email.setText(org_data[3]);
tv_phone.setText(org_data[4]);
tv_website.setText(org_data[5]);
tv_servicetype.setText(org_data[6]);
tv_servicesprovided.setText(org_data[7]);
tv_address.setText(address);
}
public void showEmailDialog() {
// Get dialog_box_goals.xml view
LayoutInflater layoutInflater = LayoutInflater.from(BusinessCardActivity.this);
View promptView = layoutInflater.inflate(R.layout.dialog_box_send_email, null);
AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(BusinessCardActivity.this);
alertDialogBuilder.setView(promptView);
final EditText etEmailMessage = (EditText) promptView.findViewById(R.id.etMailMessage);
// setup a dialog window
alertDialogBuilder.setCancelable(false)
.setPositiveButton("Submit", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
// my code
/* WONT USE THIS UNTIL EMAILS ARE FINAL
USING MY EMAIL FOR TESTING PURPOSES
// Get email
niagaraDB.open();
c2 = niagaraDB.getEmailByID(passedID);
if (c2.moveToFirst())
{
public String emailTo = c2.getString(0);
}
niagaraDB.close();
*/
// This is for final code
// String to = "mailto:" + emailTo;
String to = "snownwakendirt#yahoo.com";
String subject = "Mail From Connect & Protect Niagara App";
String message = etEmailMessage.getText().toString();
if (message.isEmpty()) {
Toast.makeText(BusinessCardActivity.this,
"Message must contain something",
Toast.LENGTH_LONG).show();
} else {
Intent email = new Intent(Intent.ACTION_SEND);
email.putExtra(Intent.EXTRA_EMAIL, new String[] { to });
// email.putExtra(Intent.EXTRA_CC, new String[]{ to});
// email.putExtra(Intent.EXTRA_BCC, new String[]{to});
email.putExtra(Intent.EXTRA_SUBJECT, subject);
email.putExtra(Intent.EXTRA_TEXT, message);
// need this to prompt email client only
email.setType("message/rfc822");
try {
startActivity(Intent.createChooser(email, "Choose an Email client :"));
finish();
Log.i("Email Sent...", "");
} catch (android.content.ActivityNotFoundException ex) {
Toast.makeText(BusinessCardActivity.this,
"There is no email client installed.",
Toast.LENGTH_SHORT).show();
}
}
}
})
.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
dialog.cancel();
}
});
// create an alert dialog
AlertDialog alert = alertDialogBuilder.create();
alert.show();
}
public void goCall(final String phoneNum) {
startActivity(new Intent(Intent.ACTION_DIAL, Uri.fromParts("tel", phoneNum, null)));
}
public void goWeb(String orgWeb) {
startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse(orgWeb)));
}
public void goCloseBusinessCard(View v) {
finish();
startActivity(new Intent(this, DirectoryActivity.class));
}
public void goMap() {
/*
int locationAddressLatInt = Integer.parseInt(locationAddressLat);
int locationAddressLongInt = Integer.parseInt(locationAddressLong);
*/
// pass id to map view. only one item in array for ease of use in MapActivity
arrlstID.add(selectedOrg);
arrID = new String[arrlstID.size()];
arrlstID.toArray(arrID);
Bundle extras = new Bundle();
extras.putStringArray("arrID", arrID);
Intent Map = new Intent(BusinessCardActivity.this, MapActivity.class);
Map.putExtras(extras);
startActivity(Map);
}
// ASYNC TASK
static class FetchOrg extends AsyncTask<String, Void, String[]> {
private FetchOrgTaskListener listener;
#Override
protected String[] doInBackground(String... params) {
try {
// assign passed string from main thread
String org_name = params[0];
String orgbyname = URL_GET_ORG_BY_NAME + "?org_name=" + org_name;
String line = "";
URL url = new URL(orgbyname);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
InputStream is = conn.getInputStream();
BufferedReader br = new BufferedReader(new InputStreamReader(is, "utf-8"));
line = br.readLine();
br.close();
is.close();
conn.disconnect();
/*
This JSON section contains a JSON Object that holds a JSON Array. The Array is created to
individualize each object within the JSON Array. Then, each JSON object is fetched and
assigned to a string variable.
*/
JSONObject JO = new JSONObject(line); // creates object from json response in data string
JSONObject Orgs = JO.getJSONObject("orgs"); // creates array for parsing of json data
// get items from JSONArray and assign for passing to onProgressUpdate
String Org = Orgs.getString("org_name");
String FirstName = Orgs.getString("contact_first_name");
String LastName = Orgs.getString("contact_last_name");
String Email = Orgs.getString("contact_email");
String Phone = Orgs.getString("contact_phone");
String Website = Orgs.getString("org_website");
String ServiceType = Orgs.getString("org_type");
String ServicesProvided = Orgs.getString("org_services");
String Address = Orgs.getString("org_street_address");
String City = Orgs.getString("org_city");
String State = Orgs.getString("org_state");
String Zip = Orgs.getString("org_zip");
String Lat = Orgs.getString("latitude");
String Long = Orgs.getString("longitude");
// Add items to string array
String[] org_data = new String[14]; // 14 is length of array, not the count
org_data[0] = Org;
org_data[1] = FirstName;
org_data[2] = LastName;
org_data[3] = Email;
org_data[4] = Phone;
org_data[5] = Website;
org_data[6] = ServiceType;
org_data[7] = ServicesProvided;
org_data[8] = Address;
org_data[9] = City;
org_data[10] = State;
org_data[11] = Zip;
org_data[12] = Lat;
org_data[13] = Long;
return org_data;
} catch (IOException | JSONException e) {
e.printStackTrace();
}
return null;
}
#Override
protected void onPostExecute(String[] result) {
super.onPostExecute(result);
if (listener != null) {
listener.onFetchOrgTaskFinished(result);
}
}
private void setListener(FetchOrgTaskListener listener) {
this.listener = listener;
}
public interface FetchOrgTaskListener {
void onFetchOrgTaskFinished(String[] result);
}
}
Activity lifecycle would go back from paused to resume state.
You need to provide the expected behaviour inside onResume something like below
public void onResume(){
super.onResume();
new XXXAsyncTask( new XXXAsyncListener(){
public void postTaskMethod(){
//do stuff here
}
}).execute();
}
I made a few changes in your onCreate()method of your BusinessCardActivity. I check for hasExtra instead--a little more flexibility. I got rid of the Listener and packed all onClick listener below. I felt it was a bit too complicated using the Listener approach (So you can remove this process.setListener(null); from the onDestroy()method). I also added a few Log.e(); so you can see what is going on in the logcat.
(BTW "TAG" would be:
private static final Strting TAG = BusinessCardActivity.class.getSimpleName();)
With "BusinessCardActivity.class.getSimpleName();" written out just in case you refactor sometime.
This is part of your BusinessCardActivity onCreate() method:
// Set variable for selectedOrg from DirectoryActivity
Intent intent = this.getIntent();
if(intent.hasExtra(selectedOrg)){
String selectedOrg = intent.getStringExtra("selectedOrg")
Log.e(TAG, "selectedOrg : " + selectedOrg);
FetchOrg process = new FetchOrg();
process.execute(selectedOrg);
}
else{
Log.e(TAG, "No Extras!")
//You might what to call finish() here
return;
}
//Move all your onClick Listeners below...
I don't think this is the best case to use a Listener so lets use the AsyncTask like this (I also removed the static):
class FetchOrg extends AsyncTask<String, Void, String[]> {
#Override
protected String[] doInBackground(String... params) {
try {
Log.e(TAG, "doInBackground ... Started");
// assign passed string from main thread
String org_name = params[0];
String orgbyname = URL_GET_ORG_BY_NAME + "?org_name=" + org_name;
String line = "";
URL url = new URL(orgbyname);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
InputStream is = conn.getInputStream();
BufferedReader br = new BufferedReader(new InputStreamReader(is, "utf-8"));
line = br.readLine();
br.close();
is.close();
conn.disconnect();
Log.e(TAG, "Data Returned : " + line);
/*
This JSON section contains a JSON Object that holds a JSON Array. The Array is created to
individualize each object within the JSON Array. Then, each JSON object is fetched and
assigned to a string variable.
*/
JSONObject JO = new JSONObject(line); // creates object from json response in data string
JSONObject Orgs = JO.getJSONObject("orgs"); // creates array for parsing of json data
// get items from JSONArray and assign for passing to onProgressUpdate
String Org = Orgs.getString("org_name");
String FirstName = Orgs.getString("contact_first_name");
String LastName = Orgs.getString("contact_last_name");
String Email = Orgs.getString("contact_email");
String Phone = Orgs.getString("contact_phone");
String Website = Orgs.getString("org_website");
String ServiceType = Orgs.getString("org_type");
String ServicesProvided = Orgs.getString("org_services");
String Address = Orgs.getString("org_street_address");
String City = Orgs.getString("org_city");
String State = Orgs.getString("org_state");
String Zip = Orgs.getString("org_zip");
String Lat = Orgs.getString("latitude");
String Long = Orgs.getString("longitude");
// Add items to string array
String[] org_data = new String[14]; // 14 is length of array, not the count
org_data[0] = Org;
org_data[1] = FirstName;
org_data[2] = LastName;
org_data[3] = Email;
org_data[4] = Phone;
org_data[5] = Website;
org_data[6] = ServiceType;
org_data[7] = ServicesProvided;
org_data[8] = Address;
org_data[9] = City;
org_data[10] = State;
org_data[11] = Zip;
org_data[12] = Lat;
org_data[13] = Long;
return org_data;
} catch (IOException | JSONException e) {
e.printStackTrace();
}
return null;
}
#Override
protected void onPostExecute(String[] result) {
setTextView(result);
}
}
Also I would change your method goBusinessCard() a bit (and no need to be public):
private void goBusinessCard(String selectedOrg) {
//Java variables should written in lower case and Classes Capitalized
Intent businessCard = new Intent(this, BusinessCardActivity.class);
businessCard.putExtra("selectedOrg", selectedOrg);
startActivity(businessCard);
}
Please let me know if you have any issues! I typed this out in a standard Text Editor..so there might be a few typos.
Posting a new answer so I can add all the code for the BusinessCardActivity class.
I added some additional logging and changed getString() to optString() in order to be able to offer an alternative value. For example if the value or "key" is invalid or missing you would get an error.
public class BusinessCardActivity extends AppCompatActivity {
TextView tv_org, tv_name, tv_email, tv_phone, tv_website, tv_servicetype,
tv_servicesprovided, tv_address;
String Favorite, Latitude, Longitude, FavoriteChanged, dbPhone, phoneNum, dbWeb, orgWeb;
CheckBox cbFavorite;
List<String> arrlstID = new ArrayList<>();
String[] arrID;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_business_card);
// Assign fields to variables
tv_org = findViewById(R.id.tv_org);
tv_name = findViewById(R.id.tv_name);
tv_email = findViewById(R.id.tv_email);
tv_phone = findViewById(R.id.tv_phone);
tv_website = findViewById(R.id.tv_website);
tv_servicetype = findViewById(R.id.tv_servicetype);
tv_servicesprovided = findViewById(R.id.tv_servicesprovided);
tv_address = findViewById(R.id.tv_address);
cbFavorite = findViewById(R.id.cbFavorite);
Intent intent = this.getIntent();
if(!intent.hasExtra("selectedOrg")){
Log.e(TAG, "No Extras!")
//You might what to call finish() here
return;
}
String selectedOrg = intent.getStringExtra("selectedOrg")
Log.e(TAG, "selectedOrg : " + selectedOrg);
FetchOrg process = new FetchOrg();
process.execute(selectedOrg);
// onClick for Email
tv_email.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v)
{
showEmailDialog();
}
});
// onClick for Call
tv_phone.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// TODO Get phone number from DB
// Replace any non-digit in phone number to make call
phoneNum = dbPhone.replaceAll("\\D", "");
// make call
goCall(phoneNum);
}
});
// onClick for Web
tv_website.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// TODO Fix URL logic
orgWeb = "http://" + dbWeb;
goWeb(orgWeb);
}
});
// onClick for Address
tv_address.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
goMap();
}
});
// TODO add favorite functionality
// When checkbox status changes, change value of Favorite
cbFavorite.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
}
});
/*
// if favorite = 1 then check box
if (Favorite.equals("1")) {
cbFavorite.setChecked(true);
} else {
cbFavorite.setChecked(false);
}
*/
}
#Override
protected void onDestroy() {
process.setListener(null); // PREVENT LEAK AFTER ACTIVITY DESTROYED
super.onDestroy();
}
// Method to assign text view items from async task
public void setTextView(String[] org_data) {
String name = org_data[1] + " " + org_data[2];
String address = org_data[8] + " " + org_data[9] + " " + org_data[10] + " " + org_data[11];
tv_org.setText(org_data[0]);
tv_name.setText(name);
tv_email.setText(org_data[3]);
tv_phone.setText(org_data[4]);
tv_website.setText(org_data[5]);
tv_servicetype.setText(org_data[6]);
tv_servicesprovided.setText(org_data[7]);
tv_address.setText(address);
}
public void showEmailDialog() {
// Get dialog_box_goals.xml view
LayoutInflater layoutInflater = LayoutInflater.from(BusinessCardActivity.this);
View promptView = layoutInflater.inflate(R.layout.dialog_box_send_email, null);
AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(BusinessCardActivity.this);
alertDialogBuilder.setView(promptView);
final EditText etEmailMessage = (EditText) promptView.findViewById(R.id.etMailMessage);
// setup a dialog window
alertDialogBuilder.setCancelable(false)
.setPositiveButton("Submit", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
// my code
/* WONT USE THIS UNTIL EMAILS ARE FINAL
USING MY EMAIL FOR TESTING PURPOSES
// Get email
niagaraDB.open();
c2 = niagaraDB.getEmailByID(passedID);
if (c2.moveToFirst())
{
public String emailTo = c2.getString(0);
}
niagaraDB.close();
*/
// This is for final code
// String to = "mailto:" + emailTo;
String to = "snownwakendirt#yahoo.com";
String subject = "Mail From Connect & Protect Niagara App";
String message = etEmailMessage.getText().toString();
if (message.isEmpty()) {
Toast.makeText(BusinessCardActivity.this,
"Message must contain something",
Toast.LENGTH_LONG).show();
} else {
Intent email = new Intent(Intent.ACTION_SEND);
email.putExtra(Intent.EXTRA_EMAIL, new String[] { to });
// email.putExtra(Intent.EXTRA_CC, new String[]{ to});
// email.putExtra(Intent.EXTRA_BCC, new String[]{to});
email.putExtra(Intent.EXTRA_SUBJECT, subject);
email.putExtra(Intent.EXTRA_TEXT, message);
// need this to prompt email client only
email.setType("message/rfc822");
try {
startActivity(Intent.createChooser(email, "Choose an Email client :"));
finish();
Log.i("Email Sent...", "");
} catch (android.content.ActivityNotFoundException ex) {
Toast.makeText(BusinessCardActivity.this,
"There is no email client installed.",
Toast.LENGTH_SHORT).show();
}
}
}
})
.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
dialog.cancel();
}
});
// create an alert dialog
AlertDialog alert = alertDialogBuilder.create();
alert.show();
}
public void goCall(final String phoneNum) {
startActivity(new Intent(Intent.ACTION_DIAL, Uri.fromParts("tel", phoneNum, null)));
}
public void goWeb(String orgWeb) {
startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse(orgWeb)));
}
public void goCloseBusinessCard(View v) {
finish();
startActivity(new Intent(this, DirectoryActivity.class));
}
public void goMap() {
/*
int locationAddressLatInt = Integer.parseInt(locationAddressLat);
int locationAddressLongInt = Integer.parseInt(locationAddressLong);
*/
// pass id to map view. only one item in array for ease of use in MapActivity
arrlstID.add(selectedOrg);
arrID = new String[arrlstID.size()];
arrlstID.toArray(arrID);
Bundle extras = new Bundle();
extras.putStringArray("arrID", arrID);
Intent Map = new Intent(BusinessCardActivity.this, MapActivity.class);
Map.putExtras(extras);
startActivity(Map);
}
// ASYNC TASK
class FetchOrg extends AsyncTask<String, Void, String[]> {
#Override
protected String[] doInBackground(String... params) {
HttpURLConnection con = null;
String[] org_data = null;
try {
Log.e(TAG, "FetchOrg doInBackground started");
// assign passed string from main thread
String org_name = params[0];
String orgbyname = URL_GET_ORG_BY_NAME + "?org_name=" + org_name;
URL url = new URL(orgbyname);
con = (HttpURLConnection) url.openConnection();
Log.e(TAG, "FetchOrg doInBackground Connected!");
//Check the response code of the server -
Integer replyCode = con.getResponseCode();
logMess += " Reply Code: " + replyCode.toString();
responseStream = new BufferedInputStream(con.getInputStream());
BufferedReader responseStreamReader = new BufferedReader(new InputStreamReader(responseStream));
stopTime = System.currentTimeMillis();
elapsedTime = stopTime - startTime;
logMess += " elapsed Time : " + elapsedTime + " ms";
Log.e(TAG, "FetchOrg logMess: --- " + logMess);
String line = "";
StringBuilder stringBuilder = new StringBuilder();
//Make sure you get everything!
while ((line = responseStreamReader.readLine()) != null) {
stringBuilder.append(line).append("\n");
}
//this will close underlying streams
responseStreamReader.close();
String data = stringBuilder.toString();
Log.e(TAG, "FetchOrg Data: --- " + data);
/*
This JSON section contains a JSON Object that holds a JSON Array. The Array is created to
individualize each object within the JSON Array. Then, each JSON object is fetched and
assigned to a string variable.
*/
JSONObject obj = new JSONObject(data); // creates object from json response in data string
JSONObject orgs = obj.getJSONObject("orgs"); // creates array for parsing of json data
String nA = "not available";
// get items from JSONArray and assign for passing to onProgressUpdate
String Org = orgs.optString("org_name", nA);
String FirstName = orgs.optString("contact_first_name", nA);
String LastName = orgs.optString("contact_last_name", nA);
String Email = orgs.optString("contact_email", nA);
String Phone = orgs.optString("contact_phone", nA);
String Website = orgs.optString("org_website", nA);
String ServiceType = orgs.optString("org_type", nA);
String ServicesProvided = orgs.optString("org_services", nA);
String Address = orgs.optString("org_street_address", nA);
String City = orgs.optString("org_city", nA);
String State = orgs.optString("org_state", nA);
String Zip = orgs.optString("org_zip", nA);
String Lat = orgs.optString("latitude", nA);
String Long = orgs.optString("longitude", nA);
// Add items to string array
org_data = new String[14]; // 14 is length of array, not the count
org_data[0] = Org;
org_data[1] = FirstName;
org_data[2] = LastName;
org_data[3] = Email;
org_data[4] = Phone;
org_data[5] = Website;
org_data[6] = ServiceType;
org_data[7] = ServicesProvided;
org_data[8] = Address;
org_data[9] = City;
org_data[10] = State;
org_data[11] = Zip;
org_data[12] = Lat;
org_data[13] = Long;
} catch (Exception ex) {
Log.e(TAG, "FetchOrg doInBackground: " + ex.getMessage());
}
finally{
//just in case you get an error above
if(con != null){
con.disconnect();
}
}
return org_data;
}
#Override
protected void onPostExecute(String[] result) {
if(result != null){
setTextView(result);
}
else{
Log.e(TAG, "FetchOrg onPostExecute: result is null");
}
}
}
Be aware that I did not clean up things like maintaining minimal scope: For example :public void showEmailDialog() and public void goMap() which do not need to be public methods! Any method that does not need to be accessed outside the class (and that is rare!) should not be made public.
You have also defined many class variables at the beginning of the class like "Favorite, Latitude, Longitude, FavoriteChanged" do they need to have class wide scope?? And they are variables! So in java naming convention, variables and methods are written in lower case, while classes are capitalized--this helps reading code easier (for the SO community!)
When working with Indent extras often mistakes are made when entering the "key" like "selectedOrg". Therefore it is some times an advantage to create a global class to help keep things straight. Example public class GlobalExtras and just keep public static final String SELECTED_ORG = "selectedOrg"; Then just use intent.getString(SELECTED_ORG);
Another thing: I am not a big fan of String[] as you have used to store your "org" strings. They can be tricky with size and indexes. You might want to consider using another object.
I do not have access to your API and your data, so I was only able to make requests on my server trying to duplicate your user scenario, but I was unable to reproduce your issue. I hope this helps, let me know what the logcat spits out!
I've done a search on another stackoverflow post for 2 hours but still can not solve this problem. I have a variable called copyAudioListIqro with List String datatype in DetailMemilihIqro Activity class. When the variable called audioIqros in the AsyncTask class (precisely in the onPostExecute method) this list has a value from my json and I want to copy audioIqros variable to copyAudioListIqro via updateData method (outside the asynctask class). When I see the log monitor on updateData method I can see the value from copyAudioListIqro, but the problem is, when I access it via readDataAudioURL method(outside the asynctask class) copyAudioListIqro variable becomes null.
What is the solution for this problem?
Thank you
Here is the overall DetailMemilihIqro class
public class DetailMemilhIqro extends AppCompatActivity {
private ProgressDialog pDialog;
private List<ModelAudioIqro> audioIqros;
private List<String> copyAudioListIqro;
private AudioAdapter mAdapter;
private RecyclerView recyclerView;
private String TAG = DetailMemilihIqro.class.getSimpleName();
Context context;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_detail_memilih_iqro);
recyclerView = (RecyclerView) findViewById(R.id.rvCVAudioIqro);
pDialog = new ProgressDialog(this);
audioIqros = new ArrayList<>();
mAdapter = new AudioAdapter(getApplicationContext(), audioIqros);
context = getApplicationContext();
copyAudioListIqro = new ArrayList<>();
recyclerView.setLayoutManager(new LinearLayoutManager(context));
recyclerView.setItemAnimator(new DefaultItemAnimator());
recyclerView.setAdapter(mAdapter);
Bundle getPosition = getIntent().getExtras();
int position = getPosition.getInt("positionUserClicked");
Log.d(TAG, "Position User clicked " + position);
if (position == 0) {
String endpoint = "http://latihcoding.com/jsonfile/audioiqro1.json";
new DownloadTask().execute(endpoint);
} else if (position == 1) {
String endpoint = "http://latihcoding.com/jsonfile/audioiqro2.json";
new DownloadTask().execute(endpoint);
} else if (position == 2) {
String endpoint = "http://latihcoding.com/jsonfile/audioiqro3.json";
new DownloadTask().execute(endpoint);
}
readDataAudioURL();
}
public void updateData(List<String> pathUrl) {
for (int i = 0; i < pathUrl.size(); i++) copyAudioListIqro.add(pathUrl.get(i));
Log.d(TAG, "updateData Method " + copyAudioListIqro.toString());
}
public void readDataAudioURL() {
Log.d(TAG, "readDataAudioURL Method " + copyAudioListIqro.toString());
}
public class DownloadTask extends AsyncTask<String, Void, List<String>> {
List<String> modelAudioIqroList;
#Override
protected void onPreExecute() {
super.onPreExecute();
pDialog.setMessage("Downloading json...");
pDialog.show();
}
#Override
protected List<String> doInBackground(String... strings) {
modelAudioIqroList = new ArrayList<>();
int result;
HttpURLConnection urlConnection;
try {
URL url = new URL(strings[0]);
urlConnection = (HttpURLConnection) url.openConnection();
int statusCode = urlConnection.getResponseCode();
// 200 represents HTTP OK
if (statusCode == 200) {
BufferedReader r = new BufferedReader(new InputStreamReader(urlConnection.getInputStream()));
StringBuilder response = new StringBuilder();
String line;
while ((line = r.readLine()) != null) {
response.append(line);
}
parseResult(response.toString());
result = 1; // Successful
Log.d(TAG, "Result " + result);
} else {
//"Failed to fetch data!";
result = 0;
Log.d(TAG, "Result " + result);
}
} catch (Exception e) {
Log.d(TAG, e.getLocalizedMessage());
}
return modelAudioIqroList; //"Failed to fetch data!";
}
#Override
protected void onPostExecute(List<String> audioIqros) {
super.onPostExecute(audioIqros);
pDialog.hide();
if (!audioIqros.isEmpty()) {
updateData(modelAudioIqroList);
} else {
Toast.makeText(context, "Empty", Toast.LENGTH_SHORT).show();
}
}
private void parseResult(String result) {
try {
JSONArray response = new JSONArray(result);
for (int i = 0; i < response.length(); i++) {
JSONObject object = response.getJSONObject(i);
ModelAudioIqro modelAudioIqro = new ModelAudioIqro();
modelAudioIqro.setName(object.getString("name"));
modelAudioIqro.setUrl(object.getString("url"));
String path = modelAudioIqro.getUrl();
Log.d(TAG, "String path " + path);
modelAudioIqroList.add(path);
}
} catch (JSONException e) {
e.printStackTrace();
}
mAdapter.notifyDataSetChanged();
}
}
}
Log for the copyAudioListIqro in the updateDataMethod
Log for the copyAudioListIqro in the readDataAudioURL
readDataAudioURL() call, that is a plain Log call, should be moved. Infact the task is asynch by nature, so oblivously the variable copyAudioListIqro won't have been initialized right after the task's start (.execute() method).
You're doing right, anyway, in notyfiying dataset change to list...You should just move it to postExecute as well...
I suggest to move all "after network" code to that postExecute, so that UI can be updated asynchronously ONLY when data is available and without blocking main thread. You can 'read' variables in the inner class, so just declare them final:
#Override
protected void onPostExecute(List<String> audioIqros) {
super.onPostExecute(audioIqros);
pDialog.hide();
if (!audioIqros.isEmpty()) {
updateData(modelAudioIqroList);
//data is now updated, notify datasets and/or send broadcast
mAdapter.notifyDataSetChanged();
readDataAudioURL();
} else {
Toast.makeText(context, "Empty", Toast.LENGTH_SHORT).show();
}
}
A more elaborate pattern would include broadcast receiver and intents, but I guess this is out of this question's scope.
I'm trying to create a method for getting the altitude of a place from the website:
https://maps.googleapis.com/maps/api/elevation/json?locations=0,0 (where the 0,0 can be replaced with any coordinates).
However, I got a problem when getting the InputStream from the URL connection.
private double altitude(double lat, double longi) {
String elevation = "";
try {
URL alt = new URL("https://maps.googleapis.com/maps/api/elevation/json?locations="+lat+","+longi);
HttpURLConnection altFind = (HttpURLConnection) alt.openConnection();
altFind.setDoInput(true);
BufferedReader in = new BufferedReader(new InputStreamReader(altFind.getInputStream()));
String inputLine;
OUT:
while ((inputLine = in.readLine()) != null) {
if (inputLine.contains("elevation")) {
for (int i = 23; ; i++) {
if (inputLine.charAt(i) != ',') {
elevation = elevation + "" + inputLine.charAt(i);
} else {
break OUT;
}
}
}
}
return Double.parseDouble(elevation);
} catch (MalformedURLException e) {}
catch (IOException e) {}
return 0;
}
That is the method and I call it from here:
private TextView t;
private LocationManager locationManager;
private LocationListener listener;
double elev;
#Override
protected void onCreate(#Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_display);
Intent intent = getIntent();
String longlat = intent.getStringExtra(MainActivity.EXTRA_MESSAGE);
longlat = longlat.replaceAll(" ", "");
String [] longilati = longlat.split(",");
final double [] coord = new double[2];
coord[0] = Double.parseDouble(longilati[0]);
coord[1] = Double.parseDouble(longilati[1]);
t = (TextView) findViewById(R.id.textView);
ConnectivityManager connectivityManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();
if (networkInfo != null && networkInfo.isConnected()) {
elev = altitude(coord[0], coord[1]);
} else {
Toast.makeText(this, "No connection available", Toast.LENGTH_LONG).show();
}
I've tried following similar questions to no avail.
You should perform Network Connections on Background Thread.
You can use Asynctask class and move altitude method inside doInBackground().
You can read more here:
https://developer.android.com/reference/android/os/AsyncTask.html
EDITED:
I found this class called JSONParser which I think this is what you need, check this out:
https://gist.github.com/dmnugent80/b2e22e5546c4b1c391ee
Copy and paste it into your project.
You can modify your altitude method by calling makeHttpRequest method from JSONParser class and passing all the parameters needed. If you do it right, then the method will return JSON object from the URL. For example:
private static final String URL = "https://maps.googleapis.com/maps/api/elevation/json";
private static final String METHOD = "GET"; // You can use POST either
private double altitude(double lat, double lng) {
double elevation = 0.0;
HashMap<String, String> params = new HashMap<>();
params.put("locations", lat + "," + lng);
// Here you can put another params if needed
JSONParser jsonParser = new JSONParser();
JSONObject jsonObject = jsonParser.makeHttpRequest(URL, METHOD, params);
if(jsonObject != null) {
Log.d(TAG, jsonObject.toString()); // Check if data has arrived safely?
try {
JSONArray results = jsonObject.getJSONArray("results");
JSONObject result = results.getJSONObject(0);
elevation = result.getDouble("elevation");
} catch (JSONException e) {
e.printStackTrace();
}
return elevation;
} else {
return -1;
}
}
Call altitude inside doInBackground and see the result.