How to prevent the MainActivity is opened twice in Android? - android-fragments

Question

I searched for a solution for more than a week to my situation and I have not found the solution.
I have a main activity and use Fragments. In my project I added a SPLASH, but as soon as it finishes executing the program opens twice.
Here's the code:
MainActivity.java
package org.jotadev.nh;
import org.jotadev.nh.adapter.TabsPagerAdapter;
import android.app.ActionBar;
import android.app.ActionBar.Tab;
import android.app.FragmentTransaction;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.support.v4.view.ViewPager;
import android.util.Log;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.widget.Toast;
public class MainActivity extends FragmentActivity implements
ActionBar.TabListener {
private ViewPager viewPager;
private TabsPagerAdapter mAdapter;
private ActionBar actionBar;
// Tab titles
private String[] tabs = { "Buscar", "Historial", "Favoritos", "Planes" };
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);//activity_main
Log.i("MainActivity", "entró en onCreate");
// Initialization
viewPager = (ViewPager) findViewById(R.id.pager);
actionBar = getActionBar();
mAdapter = new TabsPagerAdapter(getSupportFragmentManager());
viewPager.setAdapter(mAdapter);
actionBar.setHomeButtonEnabled(false);
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
// Adding Tabs
for (String tab_name : tabs) {
actionBar.addTab(actionBar.newTab().setText(tab_name)
.setTabListener(this));
}
/**
* on swiping the viewpager make respective tab selected
* */
viewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
#Override
public void onPageSelected(int position) {
// on changing the page
// make respected tab selected
actionBar.setSelectedNavigationItem(position);
Log.i("MainActivity", "entró en onPageSelected");
}
#Override
public void onPageScrolled(int arg0, float arg1, int arg2) {
}
#Override
public void onPageScrollStateChanged(int arg0) {
}
});
});
}
#Override
public void onTabReselected(Tab tab, FragmentTransaction ft) {
}
#Override
public void onTabSelected(Tab tab, FragmentTransaction ft) {
// on tab selected
// show respected fragment view
viewPager.setCurrentItem(tab.getPosition());
}
#Override
public void onTabUnselected(Tab tab, FragmentTransaction ft) {
}
//menu
#Override
public boolean onCreateOptionsMenu(Menu menu){
super.onCreateOptionsMenu(menu);
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.menu, menu);
return true;
}
public void lanzarAbout(){
Intent intent = new Intent(this, About.class);
startActivity(intent);
}
#Override
public boolean onOptionsItemSelected(MenuItem item){
switch (item.getItemId()){
case R.id.action_about:
lanzarAbout();
break;
case R.id.action_settings:
Intent intent = new Intent(this, Preferences.class);
startActivity(intent);
break;
case R.id.action_show_preferences:
Log.i("Action", "mostrando ajustes");
mostrarPreferencias();
break;
case R.id.action_exit:
finish();
}
return false;
}
private void mostrarPreferencias() {
SharedPreferences pref = getSharedPreferences("org.jotadev.nh_preferences",MODE_PRIVATE);
String s = "pantalla completa: " + pref.getBoolean("PantallaCompleta", false)
+ ", tamaño letra: " + pref.getString("Tamanoletra", "?")
+ ", color Fondo: " + pref.getString("ColorFondo", "?")
+ "En Desarrollo: " + pref.getBoolean("Endesarrollo", true);
Toast.makeText(this, s, Toast.LENGTH_LONG).show();
}
}
activity_main.xml
<android.support.v4.view.ViewPager xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/pager"
android:layout_width="match_parent"
android:layout_height="match_parent">
</android.support.v4.view.ViewPager>
AndroidManifiest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="org.jotadev.nh"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="14"
android:targetSdkVersion="17" />
<uses-permission android:name="android.permission.READ_PHONE_STATE" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE"/>
<uses-permission android:name="android.permission.CHANGE_NETWORK_STATE"/>
<uses-permission android:name="android.permission.INTERNET"/>
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme"
android:debuggable="true"
>
<!-- Splash -->
<activity
android:name=".Splash"
android:label="#string/app_name"
android:screenOrientation="landscape"
android:theme="#android:style/Theme.NoTitleBar.Fullscreen" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name="org.jotadev.nh.MainActivity"
android:label="#string/app_name" >
<intent-filter>
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
<activity android:label="#string/app_name"
android:name=".About">
</activity>
<activity android:label="#string/title_settings"
android:name=".Preferences">
</activity>
</application>
</manifest>
I appreciate your help. Or please share an useful link. It is very dificult to find answers.