ActivityNotFoundException not resolving

I want to open activity via broadcast receiver , i tried any ways , but i am getting ActivityNotFoundException , my activity is working on normal mode, but when i want to open it from BroadCastRecevier it cause ActivityNotFoundException error,

It is my manifest ,

<activity
    android:excludeFromRecents="true" 
    android:launchMode="singleTask"
    android:screenOrientation="portrait"
    android:name="com.alexis.abc.ui.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>

And it is my broadcast receiver ,

Intent intent2 = new Intent(context, MainActivity.class);
intent2.addCategory("android.intent.category.LAUNCHER");
intent2.setAction("android.intent.action.MAIN");
context.startActivity(intent2);

Here is steps :

1 - I opening application and hiding launcher icon via following code

PackageManager packageManager = getContext().getPackageManager();
ComponentName componentName = new ComponentName(getContext(), MainActivity.class);
packageManager.setComponentEnabledSetting(componentName, PackageManager.COMPONENT_ENABLED_STATE_DISABLED, PackageManager.DONT_KILL_APP);

2 - I exiting to application and dialing a number (To triggering broadcast event) and i getting following exception

android.content.ActivityNotFoundException: Unable to find explicit activity class {http://ift.tt/1ESr3ib}; have you declared this activity in your AndroidManifest.xml?