title: DialogFragment does not float on the activity window
body: <p>I create a class extends DialogFragment class, my code is as below, my problem is the dialog hides under status bar(in the system) and the toolbar(in the activity), I refer the question here  <a href="https://stackoverflow.com/questions/6779870/dialogfragment-not-floating-acts-embeded-or-as-another-fragment">DialogFragment not floating, acts embeded or as another fragment</a> add  the <code>onCreate</code> function and set the style, but the dialog still only hides under toolbar, not as the tutorial said it will float on the activity window.</p>
  
  <pre><code>public class PasswordDialog extends DialogFragment {
  ......
  public static PasswordDialog newInstance(PdfFragment pdfFragment) {
      Log.i(sClassTag,"newInstance in PdfFragmentPasswordDialog");
      PdfFragmentPasswordDialog passwordDialog = new PdfFragmentPasswordDialog();
      passwordDialog.mPdfFragment = pdfFragment;
      setInteractionListener(pdfFragment);
      return passwordDialog;
  }
  
  @Override
  public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      // Pick a style based on the num.
      int style = DialogFragment.STYLE_NORMAL, theme = 0;
      setStyle(style, theme);
  }
  
  @Override
  public View onCreateView(LayoutInflater inflater, ViewGroup container,
                           Bundle savedInstanceState) {
      Log.i(sClassTag,"onCreateView in PdfFragmentPasswordDialog");
      // Inflate the layout to use as dialog or embedded fragment
      mView = inflater.inflate(R.layout.layout_password, container, false);
      addButtonListener();
      addEdittextListener();
      return mView;
  }
  
  @Override
  public Dialog onCreateDialog(Bundle savedInstanceState) {
      Log.i(sClassTag,"onCreateView in onCreateDialog");
      Dialog dialog = super.onCreateDialog(savedInstanceState);
      dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
      return dialog;
  }
  void showPasswordDialog(boolean isFirstTime) {
  ....
   FragmentManager fragmentManager = getActivity().getFragmentManager();
  
   show(fragmentManager, "dialog");
   ...
  }
  </code></pre>
  
  <p>The layout file is </p>
  
  <pre><code>&lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:orientation="vertical"&gt;
  &lt;ImageView
      android:layout_width="48dp"
      android:layout_height="48dp"
      android:src="@drawable/ic_img_passwordkey_48"
      android:id="@+id/key_icon"
      android:layout_gravity="center_horizontal"
      android:layout_marginTop="20dp"
      android:contentDescription="@string/password_input_hint_message"/&gt;
  
  &lt;Space
      android:layout_width="match_parent"
      android:layout_height="16dp" /&gt;
  
  &lt;EditText
      android:imeOptions="flagNoExtractUi"
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:inputType="textPassword"
      android:textColorHint="@color/password_dialogUI_hint_text_color"
      android:textColor="@color/password_dialogUI_text_color"
      android:textSize="12sp"
      android:hint="@string/password_input_hint_message"
      android:ems="10"
      android:id="@+id/dialogUI_edit_text"
      android:textCursorDrawable="@null"
      android:fontFamily="sans-serif"
      android:layout_marginStart="8dp"
      android:layout_marginEnd="8dp"
      android:textDirection="locale"/&gt;
  
  &lt;TextView
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:text="@string/password_error_warning_message"
      android:textColor="@color/password_dialogUI_warning_color"
      android:id="@+id/dialogUI_warning_text"
      android:textSize="12sp"
      android:visibility="invisible"
      android:fontFamily="sans-serif"
      android:paddingStart="4dp"
      android:paddingEnd="4dp"
      android:layout_marginStart="8dp"/&gt;
  
  &lt;Space
      android:layout_width="match_parent"
      android:layout_height="8dp" /&gt;
  
  &lt;RelativeLayout
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  android:paddingBottom="8dp"&gt;
  
  &lt;Button
      android:text="@string/password_ok_button"
      android:textColor="@drawable/layout_disable_text_color"
      android:minWidth="64dp"
      android:layout_width="wrap_content"
      android:layout_height="36dp"
      android:id="@+id/password_dialogUI_ok_button"
      android:layout_alignParentEnd="true"
      style="?android:attr/borderlessButtonStyle"
      android:background="@drawable/layout_password_button_background"
      android:layout_marginEnd="8dp"/&gt;
  
  &lt;Button
      android:text="@string/password_cancel_button"
      android:textColor="@drawable/layout_disable_text_color"
      android:minWidth="64dp"
      android:layout_width="wrap_content"
      android:layout_height="36dp"
      android:id="@+id/password_dialogUI_cancel_button"
      style="?android:attr/borderlessButtonStyle"
      android:layout_toStartOf="@+id/password_dialogUI_ok_button"
      android:background="@drawable/layout_password_button_background"
      android:layout_marginEnd="8dp"/&gt;
  </code></pre>
  
  <p></p>
  
  <p></p>