title: ListActivity cannot be resolved to a type
body: <p>I am new to Android development . While creating a Task reminder application I got stuck at this point where it says "ListActivity cannot be resolved as a type".<br>
  I tried to find a solution for this but I couldn't.<br>
  This is the full code.</p>
  
  <pre><code>package com.android.taskreminder;
  
  import android.support.v7.app.ActionBarActivity;
  import android.os.Bundle;
  import android.view.Menu;
  import android.view.MenuItem;
  
  
  public class ReminderListActivity extends ListActivity {
  
      @Override
      protected void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.reminder_list);
      }
  
  
      @Override
      public boolean onCreateOptionsMenu(Menu menu) {
          // Inflate the menu; this adds items to the action bar if it is present.
          getMenuInflater().inflate(R.menu.reminder_list, menu);
          return true;
      }
  
      @Override
      public boolean onOptionsItemSelected(MenuItem item) {
          // Handle action bar item clicks here. The action bar will
          // automatically handle clicks on the Home/Up button, so long
          // as you specify a parent activity in AndroidManifest.xml.
          int id = item.getItemId();
          if (id == R.id.action_settings) {
              return true;
          }
          return super.onOptionsItemSelected(item);
      }
  }
  </code></pre>