Open a fragment of an activity from another activity

You are right, First You need to start the Activity than set the current Fragment in FragmentPager / Manager... Their is no such way to start some foreign fragment from your Activity that would be dangerous see that will lead to zombie fragments floating around the App (or May be I am not aware of that..)

1. You call the Activity Intent with some parameter for the Fragment name, you want to start i.e. interger, boolean etc...

     Intent intent = new Intent(this,SecondActivity.class);
     intent.putExtra("fragmentNumber",1); //for example    
     startActivity(intent);
   

2. You check the passed value inside OnCreate of the Second Acitivty and set the desired fragment on top.. inside OnCreate

    if(getIntent().getIntExtra("fragmentNumber",0)==1){
      //set the desired fragment as current fragment to fragment pager
     }
   

However, I am not getting the problem "It was unable to locate the activity." Have you entered the Activity in manifest file than what was the problem you were facing? Please post the full stack trace.

You can use the following:

Intent ttsSettings = new Intent("com.android.settings.TTS_SETTINGS");
ttsSettings.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(ttsSettings);