title: How to make intro slider only appear once after installation?
body: <p>I have made an intro slider with <a href="https://github.com/msayan/tutorial-view" rel="nofollow noreferrer">this library</a> . I want the slider to appear only once after the app installation. How to do this?</p>
  
  <p><strong>This is my code</strong></p>
  
  <pre><code>public class SliderActivity extends TutorialActivity {
  
  @Override
  protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      addFragment(new Step.Builder().setTitle("This is header")
              .setContent("This is content")
              .setBackgroundColor(Color.parseColor("#3F51B5")) // int background color
              .setDrawable(R.drawable.image_1) // int top drawable
              .setSummary("This is summary")
              .build());
  
      addFragment(new Step.Builder().setTitle("This is header")
              .setContent("This is content")
              .setBackgroundColor(Color.parseColor("#FF4081")) // int background color
              .setDrawable(R.drawable.image_3) // int top drawable
              .setSummary("This is summary")
              .build());
  
      addFragment(new Step.Builder().setTitle("This is header")
              .setContent("This is content")
              .setBackgroundColor(Color.parseColor("#f816a463")) // int background color
              .setDrawable(R.drawable.image_4) // int top drawable
              .setSummary("This is summary")
              .build());
  }
  
  @Override
  public void finishTutorial() {
      Intent intent = new Intent(SliderActivity.this, WelcomeActivity.class);
      startActivity(intent);
  }
  }
  </code></pre>