Can't populatemy ListView from Sqlite

I have created teh 2 xml files, and my custom view of 3 rows, 2 firsts are texts, and the last a button to delete data:

xml of the activity:

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

listpoids.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://ift.tt/nIICcg"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="horizontal" >

    <TextView
        android:id="@+id/textViewDate"
        android:layout_gravity="center"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="TextView" />

    <TextView
        android:layout_gravity="center"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="New Text"
        android:id="@+id/textViewPoids" />

    <Button
        android:layout_gravity="center"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Supprimer"
        android:id="@+id/buttonSupprimer" />

</LinearLayout>

I did my adaper:

public class PoidsAdapter extends ArrayAdapter<String> {
    private Context mContext;
    private List<String> mListPoids;

    public PoidsAdapter(Context context, int resource, List<String> objects) {
        super(context, resource, objects);
        this.mContext = context;
        this.mListPoids = objects;
    }


    @Override
    public int getCount() {
        return mListPoids.size();
    }

    @Override
    public String getItem(int position) {
        return mListPoids.get(position);
    }

    @Override
    public View getView(final int position, View view, final ViewGroup parent) {
        final holder holder;
            LayoutInflater inflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            view = inflater.inflate(R.layout.listpoids, null);
            holder = new holder();
            holder.mTvTitle = (TextView) view.findViewById(R.id.textViewDate);
            holder.mTvMediaName = (TextView) view.findViewById(R.id.textViewPoids);
            holder.mImageUrl = (Button) view.findViewById(R.id.buttonSupprimer);
    return view;
    }

    public class holder {
        public Button mImageUrl;
        public TextView mTvTitle;
        public TextView mTvMediaName;
    }
}

And the database handler to get all of the rows:

    public List<Poids> getAllPoids() {


        SQLiteDatabase db = this.getReadableDatabase();
        ArrayList<Poids> poidsList = new ArrayList<Poids>();

        Cursor cursor = db.rawQuery("SELECT * from " + TABLE_POIDS,
                new String[] {});
/*
        List<Poids> poidsList = new ArrayList<Poids>();
        // Select All Query
        String selectQuery = "SELECT * FROM " + TABLE_POIDS;

        SQLiteDatabase db = this.getWritableDatabase();
        Cursor cursor = db.rawQuery(selectQuery, null);
*/
        // looping through all rows and adding to list
        if (cursor.moveToFirst()) {
            do {
                Poids poid = new Poids();
                poid.setPoids(Integer.parseInt(cursor.getString(1)));
                poid.setDate_enr(cursor.getString(2));
                // Adding contact to list
                poidsList.add(poid);
            } while (cursor.moveToNext());
        }

        // return contact list
        return poidsList;
    }

To finish how I call it:

    db.getAllPoids();
    List<Poids> poids = db.getAllPoids();

    ListView listView=(ListView) view.findViewById(R.id.listView);

    newData = new ArrayList<String>();

    for (Poids val : poids) {

        newData.add(val.getDate_enr());
        newData.add(String.valueOf(val.getPoids()));
        //String log = "Id: " + val.getId() + " ,Date: " + val.getDate_enr() + " ,Poids: " + val.getPoids() + " ,Evolution: " + val.getEvolution() ;
        // Writing Contacts to log
        //Log.d("Name: ", log);
    }

    PoidsAdapter  mAdapter = new PoidsAdapter(getActivity(), R.layout.listpoids, newData);
    listView.setAdapter(mAdapter);

But it doesn't work, I'm in a fragment.