package org.adaptlab.chpir.android.participanttracker;

import android.app.Activity;

public class ParticipantDetailActivity extends Activity {

}

package org.adaptlab.chpir.android.participanttracker;


import android.app.Activity;
import android.support.v4.app.Fragment;

public class ParticipantDetailActivity extends SingleFragmentActivity {

    @Override
    protected Fragment createFragment() {
        return new ParticipantDetailFragment();
    }
}
Make ParticipantDetailActivity a SingleFragmentActivity and return proper fragment