How can we solve the null excaption in actionbar getactionbar function? - android-actionbar

Question

First I want to say that I am new in android, I have a lot of troubles with android action bar I am trying to not getting null on this line:
ActionBar actionBar = getActionBar();
I tried everything. I understand that it's returning null because the theme is not suitable to the theme of the activity. I don't know how to set a different theme to each one, but after I found a way to avoid this problem I got another problem. What I am trying to do is actionbar, and a tab bar, now I can't see the icons in the action bar, I see them in the overflow.
onCreate:
public class MainViewActivity extends Activity implements RoutesFragment.OnFragmentInteractionListener ,GroupsFragment.OnFragmentInteractionListener
,VideosFragment.OnFragmentInteractionListener,PhotosFragment.OnFragmentInteractionListener
{
private final CharSequence charSequence[] = {"Profile", "New route", "My route", "Liked route", "GroupsFragment", "Settings", "About CTwalk"};
private String charSequence2;
#Override
protected void onCreate(Bundle savedInstanceState) {
getWindow().requestFeature(Window.FEATURE_ACTION_BAR);
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main_view);
getOverflowMenu();
ActionBar actionBar = getActionBar();
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
actionBar.setDisplayShowTitleEnabled(true);
actionBar.setDisplayHomeAsUpEnabled(true);
Tab tab = actionBar.newTab()
.setText(R.string.tabs_Routes)
.setTabListener(new TabListener<RoutesFragment>(this, "Routes", RoutesFragment.class));
actionBar.addTab(tab);
tab = actionBar.newTab()
.setText(R.string.tabs_Groups)
.setTabListener(new TabListener<GroupsFragment>(
this, "GroupsFragment", GroupsFragment.class));
actionBar.addTab(tab);
tab = actionBar.newTab()
.setText(R.string.tabs_Photos)
.setTabListener(new TabListener<PhotosFragment>(
this, "PhotosFragment", PhotosFragment.class));
actionBar.addTab(tab);
tab = actionBar.newTab()
.setText(R.string.tabs_Videos)
.setTabListener(new TabListener<VideosFragment>(
this, "VideosFragment", VideosFragment.class));
actionBar.addTab(tab);
}
Android manidest:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.ctwalkapp.ctwalk" >
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name">
<activity
android:name=".MainActivity"
android:label="#string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".LoginActivity"
android:label="#string/title_activity_login" >
</activity>
<activity
android:name="com.facebook.FacebookActivity"
android:configChanges="keyboard|keyboardHidden|screenLayout|screenSize|orientation"
android:label="#string/app_name"
android:theme="#android:style/Theme.Translucent.NoTitleBar" />
<meta-data
android:name="com.facebook.sdk.ApplicationId"
android:value="#string/facebook_app_id" />
<activity
android:name=".MainViewActivity"
android:label="#string/title_activity_main_view"
android:parentActivityName=".LoginActivity">
<meta-data
android:name="android.support.PARENT_ACTIVITY"
android:value=".LoginActivity" />
</activity>
</application>
</manifest>
styles.xml:
<resources>
<style name="AppTheme" parent="#android:style/Theme.Holo.Light.DarkActionBar">
<item name="android:windowActionBar">true</item>
</style>
<style name= "MyCustomTheme" parent="android:style/Theme.Holo.Light">
<item name="android:actionBarStyle">#style/MyActionBar</item>
</style>
<style name="MyActionBar" parent="#android:style/Widget.Holo.Light.ActionBar">
<item name="android:background">#3f51b5</item>
</style>
</resources>