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

    //TextView list = (TextView)findViewById(R.id.listView);
    //contentProvider(list);

    String[] columns = new String[]
            {
                    MyDatabase.MyContacts._ID,
                    MyDatabase.MyContacts.Column_NameName,
            };

    String colToDisplay [] = new String[]
            {
                    MyCProviderContract.NAME
            };

    int[] colId = new int[]
            {
                    R.id.listView
            };

    ContentResolver cr = getContentResolver();
    Cursor c = cr.query(MyCProviderContract.CONTENT_URI, columns, MyDatabase.MyContacts.Column_NameName + "=0", null, null);
    c.close();

    ListAdapter adapter = new SimpleCursorAdapter(this, R.layout.activity_main, c,colToDisplay, colId, 1);
    setListAdapter(adapter);

    Button add = (Button)findViewById(R.id.addButton);
    add.setOnClickListener(new View.OnClickListener(){
        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            Intent i = new Intent(MainActivity.this, MainContacts.class);
            startActivity(i);
        }

    });
}

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textAppearance="?android:attr/textAppearanceLarge"
    android:text="@string/contacts2"
    android:id="@+id/textView"
    android:layout_alignParentTop="true"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true" />

<Button
    style="?android:attr/buttonStyleSmall"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="@string/add"
    android:id="@+id/addButton"
    android:layout_alignParentTop="true"
    android:layout_alignParentRight="true"
    android:layout_alignParentEnd="true" />

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textAppearance="?android:attr/textAppearanceSmall"
    android:text="@string/name"
    android:id="@+id/listView"
    android:layout_below="@+id/addButton"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true"
    android:layout_marginTop="42dp" />