BasePreferenceActivity.java

BasePreferenceActivity.java

public abstract class BasePreferenceActivity extends PreferenceActivity {
  private AppCompatDelegate appCompatDelegate;
  private Toolbar toolbar;

  protected abstract int getPreferencesResource();

  protected abstract int getLayoutResource();

  protected abstract int getTitleResource();

  public Toolbar getToolbar() {
    return toolbar;
  }

  @Override protected void onCreate(Bundle savedInstanceState) {
    getDelegate().installViewFactory();
    getDelegate().onCreate(savedInstanceState);
    super.onCreate(savedInstanceState);
    setContentView(getLayoutResource());
    addPreferencesFromResource(getPreferencesResource());

    toolbar = (Toolbar) findViewById(R.id.toolbar);
    if (toolbar != null) {
      setSupportActionBar(toolbar);
      getSupportActionBar().setTitle(getTitleResource());
      getSupportActionBar().setHomeButtonEnabled(true);
      getSupportActionBar().setDisplayHomeAsUpEnabled(true);
      getSupportActionBar().setDisplayShowTitleEnabled(true);
    }
  } 
  
  @Override public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {
      case android.R.id.home:
        onBackPressed();
        break;
    }
    return super.onOptionsItemSelected(item);
  }

  @Override protected void onPostCreate(Bundle savedInstanceState) {
    super.onPostCreate(savedInstanceState);
    getDelegate().onPostCreate(savedInstanceState);
  }

  public ActionBar getSupportActionBar() {
    return getDelegate().getSupportActionBar();
  }

  public void setSupportActionBar(@Nullable Toolbar toolbar) {
    getDelegate().setSupportActionBar(toolbar);
  }

  @Override public MenuInflater getMenuInflater() {
    return getDelegate().getMenuInflater();
  }

  @Override public void setContentView(@LayoutRes int layoutResID) {
    getDelegate().setContentView(layoutResID);
  }

  @Override public void setContentView(View view) {
    getDelegate().setContentView(view);
  }

  @Override public void setContentView(View view, ViewGroup.LayoutParams params) {
    getDelegate().setContentView(view, params);
  }

  @Override public void addContentView(View view, ViewGroup.LayoutParams params) {
    getDelegate().addContentView(view, params);
  }

  @Override protected void onPostResume() {
    super.onPostResume();
    getDelegate().onPostResume();
  }

  @Override protected void onTitleChanged(CharSequence title, int color) {
    super.onTitleChanged(title, color);
    getDelegate().setTitle(title);
  }

  @Override public void onConfigurationChanged(Configuration newConfig) {
    super.onConfigurationChanged(newConfig);
    getDelegate().onConfigurationChanged(newConfig);
  }

  @Override protected void onStop() {
    super.onStop();
    getDelegate().onStop();
  }

  @Override protected void onDestroy() {
    super.onDestroy();
    getDelegate().onDestroy();
  }

  public void invalidateOptionsMenu() {
    getDelegate().invalidateOptionsMenu();
  }

  private AppCompatDelegate getDelegate() {
    if (appCompatDelegate == null) {
      appCompatDelegate = AppCompatDelegate.create(this, null);
    }
    return appCompatDelegate;
  }
}