title: Installing a support library for PreferenceFragmentCompat
body: <p>I'm new to Android Studio and a total beginner at Android programming in general. I looked and looked and I couldn't find the right thing to do.</p>
  
  <p>All I want is to install a library to use <strong>PreferenceFragmentCompat</strong> or any class that replaces <strong>android.app.PreferenceFragment</strong> so my app can work in API 11 and lower.</p>
  
  <p>Can anyone please give me some details such as which library should I use and how to install it in my AS project.</p>
  
  <p><strong>Edit:</strong> So I started developing this app using <code>android.support.v4</code> and <code>android.support.v7</code> libraries to handle the Fragments so I can run it on API 11 and lower.</p>
  
  <p>this is my <strong>MainActivity.java.</strong></p>
  
  <pre><code>package com.example.myapplication;
  
  import android.app.Activity;
  import android.content.Intent;
  import android.net.Uri;
  import android.support.v4.app.Fragment;
  import android.support.v4.app.FragmentManager;
  import android.support.v7.app.AppCompatActivity;
  import android.support.v7.app.ActionBar;
  
  import android.content.Context;
  import android.os.Build;
  import android.os.Bundle;
  import android.view.Gravity;
  import android.view.LayoutInflater;
  import android.view.Menu;
  import android.view.MenuItem;
  import android.view.View;
  import android.view.ViewGroup;
  import android.support.v4.widget.DrawerLayout;
  import android.widget.ArrayAdapter;
  import android.widget.TextView;
  
  public class MainActivity extends AppCompatActivity
          implements NavigationDrawerFragment.NavigationDrawerCallbacks {
  
      /**
       * Fragment managing the behaviors, interactions and presentation of the navigation drawer.
       */
      private NavigationDrawerFragment mNavigationDrawerFragment;
  
      /**
       * Used to store the last screen title. For use in {@link #restoreActionBar()}.
       */
      private CharSequence mTitle;
  
      @Override
      protected void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.activity_main);
  
          mNavigationDrawerFragment = (NavigationDrawerFragment)
                  getSupportFragmentManager().findFragmentById(R.id.navigation_drawer);
          mTitle = getTitle();
  
          // Set up the drawer.
          mNavigationDrawerFragment.setUp(
                  R.id.navigation_drawer,
                  (DrawerLayout) findViewById(R.id.drawer_layout));
      }
  
      @Override
      public void onNavigationDrawerItemSelected(int position) {
          Fragment mainFragment = null;
  
          switch(position) {
              case 0: // home fragment
                  mainFragment = new HomeFragment();
                  break;
              case 1: // favorites list
                  mainFragment = new FaveFragment();
                  break;
              case 2: // rate app
                  /* visit app TODO put application package id in the link */
                  Intent visitStore = new Intent(Intent.ACTION_VIEW);
                  visitStore.setData(Uri.parse("market://details?id=com.google.android.apps.maps"));
                  startActivity(visitStore);
                  break;
              case 3: // settings
                  mainFragment = new SettingsFragment();
                  break;
              case 4: // about
                  mainFragment = new AboutFragment();
                  break;
  
          }
  
          if(position != 2) {
              // update the main content by replacing fragments
              FragmentManager fragmentManager = getSupportFragmentManager();
              fragmentManager.beginTransaction()
                      .replace(R.id.container, mainFragment)
                      .commit();
          }
      }
  
      public void onSectionAttached(int number) {
          String[] stringArray = getResources().getStringArray(R.array.section_titles);
          if (number &gt;= 1) {
              mTitle = stringArray[number - 1];
          }
      }
  
      public void restoreActionBar() {
          ActionBar actionBar = getSupportActionBar();
          actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_STANDARD);
          actionBar.setDisplayShowTitleEnabled(true);
          actionBar.setTitle(mTitle);
      }
  
  
      @Override
      public boolean onCreateOptionsMenu(Menu menu) {
          if (!mNavigationDrawerFragment.isDrawerOpen()) {
              // Only show items in the action bar relevant to this screen
              // if the drawer is not showing. Otherwise, let the drawer
              // decide what to show in the action bar.
              getMenuInflater().inflate(R.menu.main, menu);
              restoreActionBar();
              return true;
          }
          return super.onCreateOptionsMenu(menu);
      }
  
      @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();
  
          //noinspection SimplifiableIfStatement
          if (id == R.id.action_settings) {
              return true;
          }
  
          return super.onOptionsItemSelected(item);
      }
  
      /**
       * A placeholder fragment containing a simple view.
       */
      public static class PlaceholderFragment extends Fragment {
          /**
           * The fragment argument representing the section number for this
           * fragment.
           */
          private static final String ARG_SECTION_NUMBER = "section_number";
  
          /**
           * Returns a new instance of this fragment for the given section
           * number.
           */
          public static PlaceholderFragment newInstance(int sectionNumber) {
              PlaceholderFragment fragment = new PlaceholderFragment();
              Bundle args = new Bundle();
              args.putInt(ARG_SECTION_NUMBER, sectionNumber);
              fragment.setArguments(args);
              return fragment;
          }
  
          public PlaceholderFragment() {
          }
  
          @Override
          public View onCreateView(LayoutInflater inflater, ViewGroup container,
                                   Bundle savedInstanceState) {
              View rootView = inflater.inflate(R.layout.fragment_main, container, false);
              return rootView;
          }
  
          @Override
          public void onAttach(Activity activity) {
              super.onAttach(activity);
              ((MainActivity) activity).onSectionAttached(
                      getArguments().getInt(ARG_SECTION_NUMBER));
          }
      }
  
  }
  </code></pre>
  
  <p>Now this is my <strong>SettingsFragment.java:</strong></p>
  
  <pre><code>package com.example.myapplication;
  
  import android.os.Bundle;
  import android.preference.PreferenceFragment;
  
  public class SettingsFragment extends PreferenceFragment {
      @Override
      public void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
  
          addPreferencesFromResource(R.xml.settings);
      }
  }
  </code></pre>
  
  <p>The real problem I encounter here is with this line: <code>mainFragment = new SettingsFragment();</code> in the <code>onNavigationDrawerItemSelected(int position)</code> method in <strong>MainActivity.java</strong>. </p>
  
  <p>It returns an error saying: </p>
  
  <blockquote>
    <p>Error:(70, 32) error: incompatible types: SettingsFragment cannot be
    converted to Fragment</p>
  </blockquote>
  
  <p>How can I fix this and still be able to use my app on API 11 and lower?</p>