How to achieve a full-screen dialog as described in material guidelines?

The answer from Boss is correct, but missing the requested action bar as displayed on link in the question.

So, full example below.

Dialog fragment:

public class AKDialogFragment extends DialogFragment {private static final String TAG = "AKDialogFragment";@Overridepublic View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {    View rootView = inflater.inflate(R.layout.dialog_ak, container, false);    Toolbar toolbar = (Toolbar) rootView.findViewById(R.id.toolbar);    toolbar.setTitle("Dialog title");    ((AppCompatActivity) getActivity()).setSupportActionBar(toolbar);    ActionBar actionBar = ((AppCompatActivity) getActivity()).getSupportActionBar();    if (actionBar != null) {        actionBar.setDisplayHomeAsUpEnabled(true);        actionBar.setHomeButtonEnabled(true);        actionBar.setHomeAsUpIndicator(android.R.drawable.ic_menu_close_clear_cancel);    }    setHasOptionsMenu(true);    return rootView;}@NonNull@Overridepublic Dialog onCreateDialog(Bundle savedInstanceState) {    Dialog dialog = super.onCreateDialog(savedInstanceState);    dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);    return dialog;}@Overridepublic void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {    menu.clear();    getActivity().getMenuInflater().inflate(R.menu.menu_ak, menu);}@Overridepublic boolean onOptionsItemSelected(MenuItem item) {    int id = item.getItemId();    if (id == R.id.action_save) {        // handle confirmation button click here        return true;    } else if (id == android.R.id.home) {        // handle close button click here        dismiss();        return true;    }    return super.onOptionsItemSelected(item);}}

Layout dialog_ak.xml:

<?xml version="1.0" encoding="utf-8"?><android.support.design.widget.CoordinatorLayoutxmlns:android="http://schemas.android.com/apk/res/android"xmlns:app="http://schemas.android.com/apk/res-auto"xmlns:tools="http://schemas.android.com/tools"android:layout_width="match_parent"android:layout_height="match_parent"android:fitsSystemWindows="true"><android.support.design.widget.AppBarLayout    android:layout_width="match_parent"    android:layout_height="wrap_content"    android:theme="@style/AppTheme.AppBarOverlay">    <android.support.v7.widget.Toolbar        android:id="@+id/toolbar"        android:layout_width="match_parent"        android:layout_height="?attr/actionBarSize"        android:background="?attr/colorPrimary"        app:popupTheme="@style/AppTheme.PopupOverlay"/></android.support.design.widget.AppBarLayout><LinearLayout    xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:app="http://schemas.android.com/apk/res-auto"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:background="#ffffff"    android:orientation="vertical"    android:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    app:layout_behavior="@string/appbar_scrolling_view_behavior">    <TextView        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="Your content here"/></LinearLayout></android.support.design.widget.CoordinatorLayout>

Menu menu_ak.xml

<menu xmlns:android="http://schemas.android.com/apk/res/android"  xmlns:app="http://schemas.android.com/apk/res-auto"  xmlns:tools="http://schemas.android.com/tools">  <item    android:id="@+id/action_save"    android:orderInCategory="100"    android:title="Save"    app:showAsAction="always"/></menu>

Hosting activity must extend AppCompatActivity. Launching dialog is the same as in Boss answer:

FragmentManager fragmentManager = getSupportFragmentManager();AKDialogFragment newFragment = new AKDialogFragment();FragmentTransaction transaction = fragmentManager.beginTransaction();transaction.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN);transaction.add(android.R.id.content, newFragment).addToBackStack(null).commit();

I hope it helps someone.

Use DialogFragment

Refer this link for Showing a Dialog Fullscreen or as an Embedded Fragment

http://developer.android.com/guide/topics/ui/dialogs.html#FullscreenDialog

I am just copying the code here.

Create a dialogfragment

    public class CustomDialogFragment extends DialogFragment {    /** The system calls this to get the DialogFragment's layout, regardless        of whether it's being displayed as a dialog or an embedded fragment. */    @Override    public View onCreateView(LayoutInflater inflater, ViewGroup container,            Bundle savedInstanceState) {        // Inflate the layout to use as dialog or embedded fragment        return inflater.inflate(R.layout.purchase_items, container, false);    }    /** The system calls this only when creating the layout in a dialog. */    @Override    public Dialog onCreateDialog(Bundle savedInstanceState) {        // The only reason you might override this method when using onCreateView() is        // to modify any dialog characteristics. For example, the dialog includes a        // title by default, but your custom layout might not need it. So here you can        // remove the dialog title, but you must call the superclass to get the Dialog.        Dialog dialog = super.onCreateDialog(savedInstanceState);        dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);        return dialog;    }}

Then add this method to show the dialog

    public void showDialog() {    FragmentManager fragmentManager = getSupportFragmentManager();    CustomDialogFragment newFragment = new CustomDialogFragment();    if (mIsLargeLayout) {        // The device is using a large layout, so show the fragment as a dialog        newFragment.show(fragmentManager, "dialog");    } else {        // The device is smaller, so show the fragment fullscreen        FragmentTransaction transaction = fragmentManager.beginTransaction();        // For a little polish, specify a transition animation        transaction.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN);        // To make it fullscreen, use the 'content' root view as the container        // for the fragment, which is always the root view for the activity        transaction.add(android.R.id.content, newFragment)                   .addToBackStack(null).commit();    }}

The main thing that has to be focused is in this line

transaction.add(android.R.id.content, newFragment).addToBackStack(null).commit();

The dialog become fullscreen when u specifiy the rootview as the android.R.id.content

try this code:

Dialog yourDialog=new Dialog(this,android.R.styleTheme_Black_NoTitleBar_Fullscreen)