package com.edwise.dedicamns;

import android.app.Activity;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager.NameNotFoundException;
import android.os.Bundle;
import android.util.Log;
import android.widget.TextView;

public class AboutActivity extends Activity {
    private static final String LOGTAG = AboutActivity.class.toString();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
	Log.d(LOGTAG, "onCreate");
	super.onCreate(savedInstanceState);
	setContentView(R.layout.about);
	fillTextViewVersion();
    }

    private void fillTextViewVersion() {
	String versionName = getVersionNameApp();

	if (versionName != null) {
	    TextView textViewAbout = (TextView) findViewById(R.id.AboutVersionTextView);
	    textViewAbout.setText("Dedica MNS: " + versionName + " Version");
	}
    }

    private String getVersionNameApp() {
	String versionName = null;
	PackageInfo pinfo;
	try {
	    pinfo = getPackageManager().getPackageInfo(getPackageName(), 0);
	    versionName = pinfo.versionName;
	} catch (NameNotFoundException e) {
	    Log.e(LOGTAG, "Error al obtener la versión de la app", e);
	}
	return versionName;
    }

    @Override
    public void onBackPressed() {
	Log.d(LOGTAG, "onBackPressed");
	super.onBackPressed();

	finish();
    }

}

package com.edwise.dedicamns;

import android.app.Activity;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager.NameNotFoundException;
import android.os.Bundle;
import android.util.Log;
import android.widget.TextView;

public class AboutActivity extends Activity {
    private static final String LOGTAG = AboutActivity.class.toString();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
	Log.d(LOGTAG, "onCreate");
	super.onCreate(savedInstanceState);
	setContentView(R.layout.about);
	fillTextViewVersion();
    }

    private void fillTextViewVersion() {
	String versionName = getVersionNameApp();

	if (versionName != null) {
	    TextView textViewAbout = (TextView) findViewById(R.id.AboutVersionTextView);
	    textViewAbout.setText("Dedica MNS: " + versionName + " Version");
	}
    }

    private String getVersionNameApp() {
	String versionName = null;
	PackageInfo pinfo;
	try {
	    pinfo = getPackageManager().getPackageInfo(getPackageName(), 0);
	    versionName = pinfo.versionName;
	} catch (NameNotFoundException e) {
	    Log.e(LOGTAG, "Error al obtener la versión de la app!", e);
	}
	return versionName;
    }

    @Override
    public void onBackPressed() {
	Log.d(LOGTAG, "onBackPressed");
	super.onBackPressed();

	finish();
    }

}

Prueba commit...