connecting parse api to android swipe layout

Question

I'm doing a project using Android swipe layout. I'm getting problem when calling a datas from parse server to swiped tabs.

I'm getting this error when I'm calling a list fragment inside a fragment below is my fragment class please check

i updated code but some errors showing please check below screenshot

enter image description here

this error comes

import android.app.ListActivity;
import android.app.ListFragment;
import android.database.DataSetObserver;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.view.PagerAdapter;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ListAdapter;
import android.widget.ListView;
import com.parse.FindCallback;
import com.parse.ParseException;
import com.parse.ParseObject;
import com.parse.ParseQuery;

import java.util.ArrayList;
import java.util.List;



public class IndividualsFragment extends ListFragment implements FindCallback<ParseObject> {

private List<ParseObject> mOrganization = new ArrayList<ParseObject>();

@Override
public void onViewCreated(View view, Bundle b) {
        super.onViewCreated(view, b);

        CustomAdaptor adaptor = new CustomAdaptor(getActivity(), mOrganization);
        setListAdapter(adaptor);

        // This is like calling fetchList()
        ParseQuery.getQuery("Organization").findInBackground(this);
        }

/**
 * This is needed by implementing the callback on the class
 **/
@Override
public void done(List<ParseObject> scoreList, ParseException e) {
        if (e == null) {
        Log.d("score", "Retrieved " + scoreList.size() + " Organization");
        mOrganization.clear();
        mOrganization.addAll(scoreList);

        getListAdapter().notifyDataSetChanged();
        } else {
        Log.d("score", "Error: " + e.getMessage());
        }
        }
        }

MainActivity.class

public class MainActivity extends AppCompatActivity {

    /**
     * The {@link android.support.v4.view.PagerAdapter} that will provide
     * fragments for each of the sections. We use a
     * {@link FragmentPagerAdapter} derivative, which will keep every
     * loaded fragment in memory. If this becomes too memory intensive, it
     * may be best to switch to a
     * {@link android.support.v4.app.FragmentStatePagerAdapter}.
     */
    private SectionsPagerAdapter mSectionsPagerAdapter;

    /**
     * The {@link ViewPager} that will host the section contents.
     */
    private ViewPager mViewPager;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
        // Create the adapter that will return a fragment for each of the three
        // primary sections of the activity.
        mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());

        // Set up the ViewPager with the sections adapter.
        mViewPager = (ViewPager) findViewById(R.id.container);
        mViewPager.setAdapter(mSectionsPagerAdapter);

        TabLayout tabLayout = (TabLayout) findViewById(R.id.tabs);
        tabLayout.setupWithViewPager(mViewPager);

       Parse.initialize(new Parse.Configuration.Builder(this)
            .applicationId("my-app-id")
            .server("severn-name")
            .build()
        );
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }

    public class SectionsPagerAdapter extends FragmentPagerAdapter {

        public SectionsPagerAdapter(FragmentManager fm) {
            super(fm);
        }

        @Override
        public Fragment getItem(int position) {

            Fragment fragment = null;

            switch (position) {
                case 0:
                    Individuals t1 = new Individuals();
                    return t1;
                case 1:
                    Events t2 = new Events();
                    return t2;
                case 2:
                    Members t3 = new Members();
                    return t3;
            }
            return fragment;  
        }

        @Override
        public int getCount() {
            // Show 3 total pages.
            return 3;
        }

        @Override
        public CharSequence getPageTitle(int position) {
            switch (position) {
                case 0:
                    return "INdividuals";
                case 1:
                    return "Events";
                case 2:
                    return "Members";
            }
            return null;
        }
    }
}

This is where I call parse data.

OrganizationActivity.class

public class OrganizationActivity extends ListActivity {

    protected List<ParseObject> mOrganization;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_organization);
        fetcAndList();
    }

    void fetcAndList() {
    ParseQuery<ParseObject> query = ParseQuery.getQuery("Organization");
    query.findInBackground(new FindCallback<ParseObject>() {
            public void done(List<ParseObject> scoreList, ParseException e) {
                if (e == null) {
                    Log.d("score", "Retrieved " + scoreList.size() + " Organization");
                    mOrganization = scoreList;
                    CustomAdaptor adaptor = new CustomAdaptor(getListView().getContext(), mOrganization);
                    setListAdapter(adaptor);
                } else {
                    Log.d("score", "Error: " + e.getMessage());
                }
            }
        });
    }

    public void onCreate() {  }
}

This is tab1

Individuals.java

      import android.database.DataSetObserver;
    import android.os.Bundle;
    import android.support.v4.app.Fragment;
    import android.util.Log;
    import android.view.LayoutInflater;
    import android.view.View;
    import android.view.ViewGroup;
    import android.widget.ListAdapter;
    import android.widget.ListView;

    import com.parse.FindCallback;
    import com.parse.ParseException;
    import com.parse.ParseObject;
    import com.parse.ParseQuery;

    import java.util.List;

    /**
     * Created by faizal on 1/17/17.
     */

    public class Individuals extends Fragment implements ListAdapter  {

public class IndividualsActivity extends Fragment {
    ListView listview;



     public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);


        OrganizationActivity.fetcAndList();
    }




    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {



        View v = inflater.inflate(R.layout.activity_organization, container, false);
        listview = (ListView)v.findViewById(R.id.list);



        super.onCreate(savedInstanceState);


        return v;

    }


    }

I have created 5 xml files. This was automatically created when creating the Android Studio project.

activity_main.xml

This is list view xml

activity_organization.xml

    <?xml version="1.0" encoding="utf-8"?>
    <LinearLayout  xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:paddingBottom="@dimen/activity_vertical_margin"
        android:paddingLeft="@dimen/activity_horizontal_margin"
        android:paddingRight="@dimen/activity_horizontal_margin"
        android:paddingTop="@dimen/activity_vertical_margin">

        <ListView
            android:id="@+id/list"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_alignParentBottom="true"
            android:layout_alignParentLeft="true"
            android:layout_alignParentStart="true">        
        </ListView>        

    </LinearLayout>

This is tab1.xml
This is the first tab , here I call the fields of list view.

t1.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="cmcom.com.fbcapp.swipe_new.MainActivity$PlaceholderFragment">

    <ImageView
        android:id="@+id/logo"
        android:layout_gravity="left"
        android:layout_height="80dp"
        android:layout_width="80dp"
        android:padding="5dp"
        android:paddingLeft="5dp"
        android:paddingEnd="5dp"
        android:paddingBottom="5dp"
        android:paddingRight="5dp"
        android:paddingStart="5dp"
        android:paddingTop="5dp"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_marginLeft="12dp"
        android:layout_marginStart="12dp"
        android:layout_marginTop="14dp">    
    </ImageView>

    <TextView
        android:id="@+id/name"
        android:text="Name"
        android:layout_width="204dp"
        android:layout_height="wrap_content"
        android:layout_below="@+id/user"
        android:layout_alignLeft="@+id/user"
        android:layout_alignStart="@+id/user"
        android:layout_marginTop="13dp" />

    <TextView
        android:id="@+id/user"
        android:text="Username"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="17dp"
        android:layout_marginStart="17dp"
        android:layout_alignTop="@+id/logo"
        android:layout_toRightOf="@+id/logo"
        android:layout_toEndOf="@+id/logo" />
 </RelativeLayout>

I tried many times but failed to load parse data inside the tab fragments if anyone know please help me thank you.

Answer 1

Your ListView is not at all attached to the swipe views. Plus, it's an activity. You need to swipe between Fragments. So move the Parse code into a Fragment with a ListView

And a Fragment is not an Adapter, so you need to implement nothing

public class Individuals extends Fragment { // No implements needed 
    // Code
}

Then setAdapter is not a method of the Fragment class, so you have to use the method of the ListView itself or use a ListFragment

Here's an example of a ListFragment

(code untested)

public class IndividualsFragment 
  extends android.support.v4.app.ListFragment 
  implements FindCallback<ParseObject> {

    private List<ParseObject> mOrganization = new ArrayList<ParseObject>();

    @Override
    public void onViewCreated(View view, Bundle b) {
        super.onViewCreated(view, b);

        CustomAdaptor adaptor = new CustomAdaptor(getActivity(), mOrganization);
        setListAdapter(adaptor);

        // This is like calling fetchList()
        ParseQuery.getQuery("Organization").findInBackground(this);
    }

    /**
    * This is needed by implementing the callback on the class
    **/
    @Override
    public void done(List<ParseObject> scoreList, ParseException e) {
        if (e == null) {
            Log.d("score", "Retrieved " + scoreList.size() + " Organization");
            mOrganization.clear();
            mOrganization.addAll(scoreList);

            ((CustomAdaptor) getListAdapter()).notifyDataSetChanged();
        } else {
            Log.d("score", "Error: " + e.getMessage());
        }
    }
}

Answer 2

you may need to call back listview in
OrganizationActivity.class