SettingsActivity.java

package com.example.lost;

import android.os.Bundle;
import android.preference.PreferenceFragment;
import android.support.v7.app.AppCompatActivity;
import android.view.MenuItem;

/**
 * Settings Activity
 */
public class SettingsActivity extends AppCompatActivity {
  @Override protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    getSupportActionBar().setDisplayHomeAsUpEnabled(true);
    getFragmentManager().beginTransaction()
        .replace(android.R.id.content, new SettingsFragment())
        .commit();
  }

  @Override public boolean onOptionsItemSelected(MenuItem item) {
    if (item.getItemId() == android.R.id.home) {
      finish();
      return true;
    }

    return super.onOptionsItemSelected(item);
  }

  /**
   * Settings Fragment
   */
  public static class SettingsFragment extends PreferenceFragment {
    @Override public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      addPreferencesFromResource(R.xml.preferences);
    }
  }
}