Develop Reference

How can I differentiate values in my JSON Array from other values in my ListView?

I have a JSON Array which consists of some contacts in my phonebook who are also users of my app. For example, the JSON Array might look like :
[{"contact_phonenumber":"11111"},{"contact_phonenumber":"22222"},{"contact_phonenumber":"33333"}]
phoneNumberofContact is a string which, in the do statement in my code below, returns every contact in my phone. How can I check which phoneNumberofContact numbers appear in my JSON Array and then, besides those contacts in the ListView put the words '- app user'. My ListView is working fine, I just want to add this feature in.
So, for example, for the number 11111 I would have in my ListView :
Joe Blogs - app user
11111
Here's my code:
JSONArray jsonArrayContacts = response;
//response is something like [{"contact_phonenumber":"11111"}, etc...]
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_new_contact);
//selectPhoneContacts is an empty array list that will hold our SelectPhoneContact info
selectPhoneContacts = new ArrayList<SelectPhoneContact>();
listView = (ListView) findViewById(R.id.listviewPhoneContacts);
}
//******for the phone contacts in the listview
// Load data in background
class LoadContact extends AsyncTask<Void, Void, Void> {
#Override
protected void onPreExecute() {
super.onPreExecute();
}
#Override
protected Void doInBackground(Void... voids) {
// we want to delete the old selectContacts from the listview when the Activity loads
// because it may need to be updated and we want the user to see the updated listview,
// like if the user adds new names and numbers to their phone contacts.
selectPhoneContacts.clear();
// we have this here to avoid cursor errors
if (cursor != null) {
cursor.moveToFirst();
}
try {
// get a handle on the Content Resolver, so we can query the provider,
cursor = getApplicationContext().getContentResolver()
// the table to query
.query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI,
null,
null,
null,
// display in ascending order
ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME + " COLLATE LOCALIZED ASC");
// get the column number of the Contact_ID column, make it an integer.
// I think having it stored as a number makes for faster operations later on.
// get the column number of the DISPLAY_NAME column
int nameIdx = cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME);
// get the column number of the NUMBER column
int phoneNumberofContactIdx = cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER);
cursor.moveToFirst();
// We make a new Hashset to hold all our contact_ids, including duplicates, if they come up
Set<String> ids = new HashSet<>();
do {
System.out.println("=====>in while");
// get a handle on the display name, which is a string
name = cursor.getString(nameIdx);
// get a handle on the phone number, which is a string
phoneNumberofContact = cursor.getString(phoneNumberofContactIdx);
//----------------------------------------------------------
// get a handle on the phone number of contact, which is a string. Loop through all the phone numbers
// if our Hashset doesn't already contain the phone number string,
// then add it to the hashset
if (!ids.contains(phoneNumberofContact)) {
ids.add(phoneNumberofContact);
SelectPhoneContact selectContact = new SelectPhoneContact();
selectContact.setName(name);
selectContact.setPhone(phoneNumberofContact);
selectPhoneContacts.add(selectContact);
}
} while (cursor.moveToNext());
} catch (Exception e) {
Toast.makeText(NewContact.this, "what the...", Toast.LENGTH_LONG).show();
e.printStackTrace();
// cursor.close();
} finally {
}
if (cursor != null) {
cursor.close();
}
return null;
}
#Override
protected void onPostExecute(Void aVoid) {
super.onPostExecute(aVoid);
adapter = new SelectPhoneContactAdapter(selectPhoneContacts, NewContact.this);
// we need to notify the listview that changes may have been made on
// the background thread, doInBackground, like adding or deleting contacts,
// and these changes need to be reflected visibly in the listview. It works
// in conjunction with selectContacts.clear()
adapter.notifyDataSetChanged();
listView.setAdapter(adapter);
}
}

In the first, you can parse the jsonArrayContacts to a List:
final List<String> responseContacts = new ArrayList<String>();
try {
JSONArray responseObject = new JSONArray(response);
for (int i = 0; i < responseObject.length(); i++) {
final JSONObject obj = responseObject.getJSONObject(i);
responseContacts.add(obj.getString("contact_phonenumber"));
}
// System.out.println("the matching contacts of this user are :" + responseContacts);
} catch(Exception e) {
e.printStackTrace();
}
after you get your local contacts, then you have two sets of contacts, so it's easy to check which number appears in your json array contacts.
And then you can pass the responseContacts into SelectPhoneContactAdapter during you initialize it, and in getView() method of the adapter, you can know whether you need to put the words '- app user' to your item view or not.

Showing an ArrayList content on a Toast

I have a listView and I want to print the arrrayList which contains the selected items.
I can show the choice that I choose every time. i.e. if I select a choice, I can print it in a toast (I mark it in my code as a comment), but I want to print the whole choices together.
Any help please?
Thanks..

If I understand correctly, you want to display the contents of your arrayList in a Toast.
Like donfuxx said, you need to create your arrayList outside of your onclicklistener.
As the user clicks an item, it will be added to your arrayList.
Then loop over the list to fill a string called allItems, then show allItems in a toast.
ArrayList<String> checked = new ArrayList<String>();
listView.setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
String listItem = (String) listView.getItemAtPosition(position);
if(!checked.contains(listItem)){ //optional: avoids duplicate Strings in your list
checked.add((position+1), listItem);
}
String allItems = ""; //used to display in the toast
for(String str : checked){
allItems = allItems + "\n" + str; //adds a new line between items
}
Toast.makeText(getApplicationContext(),allItems, Toast.LENGTH_LONG).show();
}
});

Well you have the right concept, jsut wrong execution here is the part you missed out on:`
ArrayList<String> checked = new ArrayList<String>();
checked.add((position+1), listItem);
Toast.makeText(getApplicationContext(),checked.get((position+1)), Toast.LENGTH_LONG).show();`
You have to get the position of the element in the ArrayList which you require to fetch, hence
checked.get(array position of element here)

If you want to show every item that is in the ArrayList you can use a simple loop and add them to a string like this:
...
checked.add((position+1), listItem);
String tempString = "";
for(int x = 0; x < checked.length(); x++) {
tempString = tempString + ", " + checked.get(x);
}
tempString = tempString.substring(2);
Toast.makeText(getApplicationContext(),tempString, Toast.LENGTH_LONG).show();
EDIT modified it a bit to only put commas between items

How to dynamically add suggestions to autocompletetextview with preserving character status

Problem Description:
I am facing some problem with AutoCompleteTextView where I have to show suggestions after each keypress.
Thing is that, list of suggestion is dynamic like google's suggestion feature.
It means the new suggestions should be added as user keeps typing in plus all matching old suggestions should be displayed.
For example
I write "te" and then it should display previous suggestions like "test1" & "test2" and the new suggestions that I will get from Web API. Suppose web api gives me word "tea"& "tension ".
Now the AutoCompleteTextView will have "te" as string with all four suggestions showing below it.
This is exactly what I am looking for.
looks simple but it is showing a strange behaviour.
I am using default ArrayAdapter class instance of which I am declaring globally.
arrayAdapter=new ArrayAdapter<String>(this, android.R.layout.simple_dropdown_item_1line,suggestions);
word.setAdapter(arrayAdapter);
suggestions is ArrayList.
Upon getting new result from WebApi I simply call
arrayAdapter.notifyDataSetChanged();
to refresh the data observer and views attached with this (in our case AutoCompleteListView).
But it closes suggestions.
When I don't use notifyDataSetChanged(); it is showing all suggestions regardless of characters I have typed.
I tried it with custom filter as many suggested but none of them is helpful as I couldn't use notifyDataSetChanged().
I am posting an image to avoid confusions.
I have a confusion that why notifyDataSetChanged(); its not working. I haven't use any other reference of list with same arrayAdapter instance. I really doubt if it's a reference problem.

one of the easiest way of doing that (put the code in onCreate):
EDIT: addied wikipedia free opensearch (if https://en.wikipedia.org doesn't work try http://en.wikipedia.org)
AutoCompleteTextView actv = new AutoCompleteTextView(this);
actv.setThreshold(1);
String[] from = { "name", "description" };
int[] to = { android.R.id.text1, android.R.id.text2 };
SimpleCursorAdapter a = new SimpleCursorAdapter(this, android.R.layout.simple_list_item_2, null, from, to, 0);
a.setStringConversionColumn(1);
FilterQueryProvider provider = new FilterQueryProvider() {
#Override
public Cursor runQuery(CharSequence constraint) {
// run in the background thread
Log.d(TAG, "runQuery constraint: " + constraint);
if (constraint == null) {
return null;
}
String[] columnNames = { BaseColumns._ID, "name", "description" };
MatrixCursor c = new MatrixCursor(columnNames);
try {
String urlString = "https://en.wikipedia.org/w/api.php?" +
"action=opensearch&search=" + constraint +
"&limit=8&namespace=0&format=json";
URL url = new URL(urlString);
InputStream stream = url.openStream();
BufferedReader reader = new BufferedReader(new InputStreamReader(stream));
String jsonStr = reader.readLine();
// output ["query", ["n0", "n1", ..], ["d0", "d1", ..]]
JSONArray json = new JSONArray(jsonStr);
JSONArray names = json.getJSONArray(1);
JSONArray descriptions = json.getJSONArray(2);
for (int i = 0; i < names.length(); i++) {
c.newRow().add(i).add(names.getString(i)).add(descriptions.getString(i));
}
} catch (Exception e) {
e.printStackTrace();
}
return c;
}
};
a.setFilterQueryProvider(provider);
actv.setAdapter(a);
setContentView(actv, new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT));

You have impletent the custome filter in the child class of ArrayAdapter, there in perform filter method you have to do network call and get data from server. You can set this data in your main arraylist.

Querying Parse.com and trying to display in Android ListView

Using Parse.com for the first time . Here's the problem,I am trying to query the Parse.com and then displaying it in android listview Log is getting printed properly but some issue in displaying it in listview
Here's the code
ArrayList<String> mFuncDate = new ArrayList<String>();
private ListView lv;
lv = (ListView) findViewById(R.id.myList);
ParseQuery<ParseObject> query = ParseQuery.getQuery("GameScore");
query.findInBackground(new FindCallback<ParseObject>() {
public void done(List<ParseObject> scoreList, ParseException e) {
if (e == null) {
//Log.d("score", "Retrieved " + scoreList.size() + " in list " + scoreList.get(0).getString("ClientName"));
for(int i=0;i<scoreList.size();i++) {
Log.d("data","Retrieved Object is " + scoreList.get(i).getString("Date"));
mFuncDate.add( scoreList.get(i).getString("Date"));
}
} else {
Log.d("score", "Error: " + e.getMessage());
}
}
});
//String arr[]=mFuncDate.toArray(new String[mFuncDate.size()]);
lv.setAdapter(new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1 ,android.R.id.text1 ,mFuncDate));
Where am I going wrong ?
Updated:
The problem is I can not see data getting updated in my listview, After trying so much time When I run this app when my screen is off I can see the listview getting updated but then normally I can not see anything in the listview ... I think it is something related to findInBackground so need help

I tried to update the listview by calling listAdapter.notifyDataSetChanged() after querying is done, in order for the list to repaint using the new data.

Sorting the contents of ArrayAdapter or ArrayList

I am working on android project and am making using of a ListView that retrieves data from the SQLite database.
I am making a dataset using an ArrayList and then adding this ArrayList into an ArrayAdapter.
When the data is being retrieved from the database, I am telling SQLite to do the sorting so everything is in alphabetical order when it is added into the ListView. At certain times, the information will be added dynamically to to the ListView without it requiring to re-fetch everythin from the database again. However, I want to keep everything in alphabetical order.
How would I do this, do I sort the DataSet and then call the notifyDataSet Changes or do I do the sort directly on the ArrayAdapter. I've looked into performing the sort on the ArrayAdapter but this wants an argument that uses a Comparator but not sure what this is and can't find any working examples that may be of any help for what I want to achieve.
Below is the code that populates the array and sets the list adapter
ArrayList<Spanned> passwords = managePasswordList.getPasswordList();
if (passwords != null && passwords.size() > 0)
{
passwordArrayAdapter = new ArrayAdapter<Spanned>(getActivity().getApplicationContext(),
android.R.layout.simple_list_item_activated_1, passwords);
setListAdapter(passwordArrayAdapter);
myListView.setTextFilterEnabled(true);
txtNoRecords.setVisibility(View.GONE);
}
else
{
txtNoRecords.setVisibility(View.VISIBLE);
}
I am then adding data to the dataset and refreshing the list view using the following
String company = Encryption.decrypt(passwords.get(i).company);
String username = Encryption.decrypt(passwords.get(i).username);
details = Html.fromHtml(company + "<br />" + "<small><font color=\"#767676\">" + username + "</b></small>");
passwords.add(details);
passwordArrayAdapter.notifyDataSetChanged();
Thanks for any help you can provide.
UPDATE 1
I've tried doing what Nick Bradbury suggested but I am having a problem with the comparator. I have the following code but I don't know where to go from here.
SQLiteDatabase myDb = null;
Cursor cursor = null;
ArrayList<Spanned> passwords = new ArrayList<Spanned>();
try
{
myDb = context.openOrCreateDatabase("PasswordManager", Context.MODE_PRIVATE, null);
cursor = myDb.rawQuery("SELECT * FROM password ASC", null);
while (cursor.moveToNext())
{
final String company = Encryption.decrypt(cursor.getString(2));
final String username = Encryption.decrypt(cursor.getString(4));
Spanned details = Html.fromHtml(company + "<br />" + "<small><font color=\"#767676\">" + username + "</b></small>");
passwords.add(details);
Collections.sort(passwords, new Comparator<Spanned>() {
public int compare(Spanned lhs, Spanned rhs) {
return 0;
}
});
}
}
catch (SQLiteException ex)
{
common.showBasicAlertDialog("Unfortunately something has gone wrong.\n\nWe will fix this as soon as we can", false);
Log.e("Database Error", ex.toString());
return null;
}
In the return statement I have no idea what to do, I've tried return lhs.compareTo but the lhs and rhs variables don't have the compareTo function so I have not got a clue what to do.

Here's a simple example of sorting an ArrayList using Comparator. In this example, the ArrayList is defined as:
public class StatusList extends ArrayList<Status>
A sort routine for this ArrayList could look like this:
public void sort() {
Collections.sort(this, new Comparator<Status>() {
#Override
public int compare(Status item1, Status item2) {
return item2.getDate().compareTo(item1.getDate());
}
});
}
Replace <Status> with whatever object your ArrayList contains, then change the comparison to compare the values of the object you wish to sort by.