Why is my ListView not showing anything?

I have a very basic ListView in android and had set a very basic adapter. My problem is that the list view does not show anything, regardless of the adapter and the notifyDataSetChanged();

Here is my code: XML:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content">
  <TextView android:text="@string/app_name"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  ></TextView>
  <ListView android:id="@+id/selectView"
    android:layout_height="wrap_content"
    android:layout_width="wrap_content">
    </ListView>
</RelativeLayout>

The Activity code:

import android.app.Activity;
import android.os.Bundle;
import android.widget.ListView;

import com.androidcourse.phonemapper.R;
import com.androidcourse.phonemapper.model.SelectViewAdapter;

public class SelectActivity extends Activity {

    private ListView mListView;

    private SelectViewAdapter mAdapter;

    @Override
    public void onCreate(Bundle savedState) {
        super.onCreate(savedState);
        setContentView(R.layout.select_activity);
        initializeListView();

    }

    private void initializeListView() {
        mListView = (ListView) findViewById(R.id.selectView);
        mAdapter = new SelectViewAdapter(this);
        mListView.setAdapter(mAdapter);
        mAdapter.notifyDataSetChanged();
    }

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

And the Adapter code:

import android.content.Context;
import android.graphics.Color;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;

public class SelectViewAdapter extends BaseAdapter {

    private Context mContext;
    private TextView mMockTextView;