Recycleview doesn't show the items

My APP is composed by 4 fragments, 1 activity (mainpage).
Each fragment show somethings; in this case I want to show to the user some informations about telecommunications, but i really need to use a RecycleView.

If I try to put a TextView, it works fine, but with a ListView or a RecycleView it doesn't show nothing.

homepage.java

import ...

public class homepage extends AppCompatActivity

private SectionsPagerAdapter mSectionsPagerAdapter;
private ViewPager mViewPager;

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

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);

mViewPager.addOnPageChangeListener(new
TabLayout.TabLayoutOnPageChangeListener(tabLayout));
tabLayout.addOnTabSelectedListener(new
TabLayout.ViewPagerOnTabSelectedListener(mViewPager));




@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_homepage, 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 static class PlaceholderFragment extends Fragment
private static final String ARG_SECTION_NUMBER = "section_number";

public PlaceholderFragment()


public static PlaceholderFragment newInstance(int sectionNumber)
PlaceholderFragment fragment = new PlaceholderFragment();
Bundle args = new Bundle();
args.putInt(ARG_SECTION_NUMBER, sectionNumber);
fragment.setArguments(args);
return fragment;


@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState)
View rootView = null;

switch(getArguments().getInt(ARG_SECTION_NUMBER))

case 1:
rootView = inflater.inflate(R.layout.fragment_homepage,
container, false);
break;
case 2:
rootView = inflater.inflate(R.layout.fragment_fibra,
container, false);
break;
case 3:
rootView = inflater.inflate(R.layout.fragment_fibra,
container, false);
break;
case 4:
rootView = inflater.inflate(R.layout.fragment_aiuto,
container, false);
break;

return rootView;



public class SectionsPagerAdapter extends FragmentPagerAdapter

public SectionsPagerAdapter(FragmentManager fm)
super(fm);


@Override
public Fragment getItem(int position)

return PlaceholderFragment.newInstance(position + 1);


@Override
public int getCount()
// Show 3 total pages.
return 4;





fragment_fibra.xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".fibra"
android:background="#EFEFEF">

<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
app:popupTheme="@style/AppBarOverlay">

</android.support.v7.widget.Toolbar>

<android.support.v7.widget.RecyclerView
android:id="@+id/ListaFibra"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scrollbars="vertical"
android:visibility="visible" />

</FrameLayout>


MyAdapter.java

public class MyAdapter extends RecyclerView.Adapter<MyAdapter.MyViewHolder>

private String mDataset;

// Provide a reference to the views for each data item
// Complex data items may need more than one view per item, and
// you provide access to all the views for a data item in a view holder
public static class MyViewHolder extends RecyclerView.ViewHolder
// each data item is just a string in this case
public TextView mTextView;
public MyViewHolder(TextView v)
super(v);
mTextView = v;



// Provide a suitable constructor (depends on the kind of dataset)
public MyAdapter(String myDataset)
mDataset = myDataset;


// Create new views (invoked by the layout manager)
@Override
public MyAdapter.MyViewHolder onCreateViewHolder(ViewGroup parent,
int viewType)
// create a new view
TextView v = (TextView) LayoutInflater.from(parent.getContext())
.inflate(R.layout.fragment_homepage, parent, false);

MyViewHolder vh = new MyViewHolder(v);
return vh;


// Replace the contents of a view (invoked by the layout manager)
@Override
public void onBindViewHolder(MyViewHolder holder, int position)
// - get element from your dataset at this position
// - replace the contents of the view with that element
holder.mTextView.setText(mDataset[position]);



// Return the size of your dataset (invoked by the layout manager)
@Override
public int getItemCount()
return mDataset.length;




yesterday

today

1 Answer
1

You are never using the recyclerview.

You can do the following things in the onCreateView method of your Fragment:

That could be a starting point. Hope it helps :)

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