Trouble displaying data on a list

Question

I am trying to display information on a list using an ArrayAdapter, and where the information are retrieved from Parse.com. To achieve this, I have created a listview in my layout, and have attempted to relate my listview in the code below. In doing so, I have encounter a few errors that I am having difficulty resolving.

In particular, I receive the following error for the below line "The method setAdapter(ArrayAdapter) is undefined for the type List"

 mUsers.setAdapter(arrayAdapter);

I have been able to retrieve the following information:

           mParseUser.getString("name");
           mParseUser.getNumber("age"); 
           mParseUser.getString("headline");

However, I want to display that in my the application, and was thinking initially of using a listview.

Below is my activity code public class MatchingActivity extends Activity {

    protected ParseRelation<ParseUser> mFriendsRelation;
    protected ParseUser mCurrentUser;   
    protected List<ParseUser> mUsers;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);
        setContentView(R.layout.matching);
        // Show the Up button in the action bar.
         //create list variable
        mUsers = (List<ParseUser>) findViewById(R.id.listView1);



    }
    @Override
    protected void onResume() {
        super.onResume();

        mCurrentUser = ParseUser.getCurrentUser();


        setProgressBarIndeterminateVisibility(true);

        ParseQuery<ParseUser> query = ParseUser.getQuery();
        query.findInBackground(new FindCallback<ParseUser>() {
            public void done(List<ParseUser> users, ParseException e) {
                if (e == null) {



                  //add all the users to your list variable 
                    mUsers.addAll(users); 



                } else {
                    // Something went wrong.
                }
            }
        });

        //check the size of your list to see how big it is before accessing it
        final int size = mUsers.size(); 

       //or use a loop to loop through each one
        for(ParseUser mParseUser : mUsers)
        {
              //skip over the current user
           if(mParseUser == ParseUser.getCurrentUser())
               continue; 

           mParseUser.getString("name");
           mParseUser.getNumber("age"); 
           mParseUser.getString("headline");

           ArrayAdapter<String> arrayAdapter = new ArrayAdapter<String>(
                   this, 
                   android.R.layout.simple_list_item_1, Unsure what to input here, 
                   as I want to return all three items (name, age, headline) from parse into the list);
           mUsers.setAdapter(arrayAdapter);
        }

    }
    }   

Below is my XML code

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <ListView
        android:id="@+id/listView1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >
    </ListView>

</LinearLayout>

Any help would be greatly appreciated, thanks in advance.

Update The code now uses ParseQueryAdapter, but I have encountered a few errors such has:

"The type new ParseQueryAdapter.OnQueryLoadListener(){} must implement the inherited abstract method ParseQueryAdapter.OnQueryLoadListener.onLoaded(List, Exception)"

In particular, the above error was found in the following section:

// Perhaps set a callback to be fired upon successful loading of a new set of ParseObjects.
         adapter.addOnQueryLoadListener(new OnQueryLoadListener<ParseObject>() {
           public void onLoading() {
             // Trigger any "loading" UI
           }

In the following lines

  public ParseQuery create() {
                 ParseQuery query = new ParseQuery("User");

                 query.orderByDescending("name");
                 return query;
               }
             };

I have set "User" has the class name, and "name" has string value of the class. How would I also include other items like "headline" string value and "age" number value into the query list as well.

The complete code is as follow:

// Instantiate a QueryFactory to define the ParseQuery to be used for fetching items in this
 // Adapter.
 ParseQueryAdapter.QueryFactory<ParseObject> factory =
     new ParseQueryAdapter.QueryFactory<ParseObject>() {
       public ParseQuery create() {
         ParseQuery query = new ParseQuery("Customer");
         query.whereEqualTo("activated", true);
         query.orderByDescending("moneySpent");
         return query;
       }
     };

 // Pass the factory into the ParseQueryAdapter's constructor.
 ParseQueryAdapter<ParseObject> adapter = new ParseQueryAdapter<ParseObject>(this, factory);
 adapter.setTextKey("name");

 // Perhaps set a callback to be fired upon successful loading of a new set of ParseObjects.
 adapter.addOnQueryLoadListener(new OnQueryLoadListener<ParseObject>() {
   public void onLoading() {
     // Trigger any "loading" UI
   }

   public void onLoaded(List<ParseObject> objects, ParseException e) {
     // Execute any post-loading logic, hide "loading" UI
   }
 });

 // Attach it to your ListView, as in the example above
 ListView listView = (ListView) findViewById(R.id.listview);
 listView.setAdapter(adapter);

Update 2 Below is the updated code I have made the following adjustments

1) added @Override on top of public void onloading 2) changed ParseQuery query = new ParseQuery("User"); to ParseQuery query = new ParseQuery("User");

due to the following message " ParseQuery is a raw type. References to generic type ParseQuery should be parameterized"

Below is the updated code

public class MatchingActivity extends Activity {


    protected ParseRelation<ParseUser> mFriendsRelation;
    protected ParseUser mCurrentUser;   
    protected List<ParseUser> mUsers;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);
        setContentView(R.layout.matching);
        // Instantiate a QueryFactory to define the ParseQuery to be used for fetching items in this
         // Adapter.
         ParseQueryAdapter.QueryFactory<ParseObject> factory =
             new ParseQueryAdapter.QueryFactory<ParseObject>() {
               public ParseQuery create() {
                 ParseQuery<ParseUser> query = new ParseQuery<ParseUser>("User");

                 query.orderByDescending("name");
                 return query;
               }
             };

         // Pass the factory into the ParseQueryAdapter's constructor.
         ParseQueryAdapter<ParseObject> adapter = new ParseQueryAdapter<ParseObject>(this, factory);
         adapter.setTextKey("name");

         // callback to be fired upon successful loading of a new set of ParseObjects.
         adapter.addOnQueryLoadListener(new OnQueryLoadListener<ParseObject>() {
             @Override 
             public void onLoading() {
             // Trigger any "loading" UI
           }

           public void onLoaded(List<ParseObject> objects, ParseException e) {
             // Execute any post-loading logic, hide "loading" UI
           }

        @Override
        public void onLoaded(List<ParseObject> objects, Exception e) {
            // TODO Auto-generated method stub

        }
         });

         // Attach it to your ListView, as in the example above
         ListView listView = (ListView) findViewById(R.id.listViewSingleClick);
         listView.setAdapter(adapter);


    }
        }   

Update 3

public class MatchingActivity extends Activity {


    protected ParseRelation<ParseUser> mFriendsRelation;
    protected ParseUser mCurrentUser;   
    protected List<ParseUser> mUsers;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);
        setContentView(R.layout.matching);
        // Instantiate a QueryFactory to define the ParseQuery to be used for fetching items in this
         // Adapter.
         ParseQueryAdapter.QueryFactory<ParseObject> factory =
             new ParseQueryAdapter.QueryFactory<ParseObject>() {
               public ParseQuery create() {
                 ParseQuery<ParseUser> query = new ParseQuery<ParseUser>("User");
                query.setLimit(5);
                 query.orderByDescending("name");
                 return query;
               }
             };

         // Pass the factory into the ParseQueryAdapter's constructor.
         ParseQueryAdapter<ParseObject> adapter = new ParseQueryAdapter<ParseObject>(this, factory);
         adapter.setTextKey("name");

         // callback to be fired upon successful loading of a new set of ParseObjects.
         adapter.addOnQueryLoadListener(new OnQueryLoadListener<ParseObject>() {
             @Override 
             public void onLoading() {
             // Trigger any "loading" UI
           }



        @Override
        public void onLoaded(List<ParseObject> objects, Exception e) {
            // TODO Auto-generated method stub

        }
         });

         // Attach it to your ListView, as in the example above
         ListView listView = (ListView) findViewById(R.id.listViewSingleClick);
         listView.setAdapter(adapter);


    }
        }

Answer 1

Why don't you use ParseQueryAdapter https://www.parse.com/docs/android/api/?com/parse/ParseObject.html? I think it is the best way to fetch data from Parse and display it as a list. If you want to use some simple mappings between data in list and visual representation of a list just create new ParseQueryAdapter and select columns from that you will fetch data to image and to text field of ListView item.

   ParseQueryAdapter<ParseUser> adapter = new ParseQueryAdapter<>(this, ParseUser.class);
   adapter.setTextKey("username");
   adapter.setImageKey("userpic");
   mListView.setAdapter(adapter);

Check this tutorial https://www.parse.com/tutorials/mealspotting it will help you