title: Create AletDialog for an activity in another class [CONTEXT]
body: <p>MainActivity [A]</p>
  
  <pre><code>    public class ViewActivity extends AppCompatActivity implements
          FilterDialogFragment.FilterListener,
          AffichageAdapter.OnAffichageSelectedListener {
  
     public void onCreate(Bundle savedInstanceState) {
             super.onCreate(savedInstanceState);
             setContentView(R.layout.activity_view);
             ButterKnife.bind(this);
  </code></pre>
  
  <p>Class [B]: i want to create a AlertDialogue when i click that its show in ViewActivity</p>
  
  <pre><code>public class AffichageAdapter extends FirestoreAdapter&lt;AffichageAdapter.ViewHolder&gt; {
  
  AlertDialog.Builder Alert = new AlertDialog.Builder(What i Put here ! );
  </code></pre>