Android DialogFragment vs Dialog

Question

Google recommends that we use DialogFragment instead of a simple Dialog by using Fragments API  but it is absurd to use an isolated DialogFragment for a simple Yes-No confirmation message box  What is the best practice in this case

User · Answer

I would recommend using DialogFragment   Sure  creating a  Yes No  dialog with it is pretty complex considering that it should be rather simple task  but creating a similar dialog box with Dialog is surprisingly complicated as well     Activity lifecycle makes it complicated - you must let Activity manage the lifecycle of the dialog box - and there is no way to pass custom parameters e g  the custom message to Activity showDialog if using API levels under 8   The nice thing is that you can usually build your own abstraction on top of DialogFragment pretty easily

User · Answer

Yes  use DialogFragment and in onCreateDialog you can simply use an AlertDialog builder anyway to create a simple AlertDialog with Yes No confirmation buttons  Not very much code at all   With regards handling events in your fragment there would be various ways of doing it but I simply define a message Handler in my Fragment  pass it into the DialogFragment via its constructor and then pass messages back to my fragment s handler as approprirate on the various click events  Again various ways of doing that but the following works for me   In the dialog hold a message and instantiate it in the constructor   private Message okMessage      okMessage   handler obtainMessage MY MSG WHAT  MY MSG OK     Implement the onClickListener in your dialog and then call the handler as appropriate   public void onClick           if  which    DialogInterface BUTTON POSITIVE            final Message toSend   Message obtain okMessage           toSend sendToTarget               Edit  And as Message is parcelable you can save it out in onSaveInstanceState and restore it  outState putParcelable  okMessage   okMessage     Then in onCreate  if  savedInstanceState    null        okMessage   savedInstanceState getParcelable  okMessage

User · Answer

Generic AlertDialogFragment with Builder Pattern  In my project  I already used AlertDialog Builder already a lot before I found out that it s problematic  However  I did not want to change that much code anywhere in my app  Additionally  I actually am a fan of passing OnClickListeners as anonymous classes where they are needed  that is  when using setPositiveButton    setNegativeButton   etc   instead of having to implement thousands of callback methods to communicate between a dialog fragment and the holder fragment  which can  in my opinion  lead to very confusing and complex code  Especially  if you have multiple different dialogs in one fragment and then need to distinguish in the callback implementations between which dialog currently being shown   Therefore  I combined different approaches to create a generic AlertDialogFragment helper class which can be used exactly like AlertDialog     SOLUTION   PLEASE NOTE that I am using Java 8 lambda expressions in my code  so you might have to change parts of the code if you are not using lambda expressions yet           Helper class for dialog fragments to show a   link AlertDialog   It can be used almost exactly    like a   link AlertDialog Builder      lt p   gt     Creation Date  22 03 16        author felix  http   flx-apps com      public class AlertDialogFragment extends DialogFragment       protected FragmentActivity activity      protected Bundle args      protected String tag   AlertDialogFragment class getSimpleName          Override     public void onCreate Bundle savedInstanceState            super onCreate savedInstanceState           activity   getActivity            args   getArguments                NonNull      Override     public Dialog onCreateDialog Bundle savedInstanceState            Dialog dialog   setDialogDefaults new AlertDialog Builder getActivity     create             if  args containsKey  gravity                  dialog getWindow   getAttributes   gravity   args getInt  gravity                       dialog setOnShowListener d - gt                if  dialog    null  amp  amp  dialog findViewById  android R id message      null                      TextView  dialog findViewById android R id message   setMovementMethod LinkMovementMethod getInstance                                       return dialog              Nullable      Override     public View onCreateView LayoutInflater inflater   Nullable ViewGroup container   Nullable Bundle savedInstanceState            return super onCreateView inflater  container  savedInstanceState               Override     public void onDismiss DialogInterface dialog            super onDismiss dialog            if  args containsKey  onDismissListener                  Parcelable onDismissListener   args getParcelable  onDismissListener                if  onDismissListener    null  amp  amp  onDismissListener instanceof ParcelableOnDismissListener                      ParcelableOnDismissListener  onDismissListener  onDismiss this                                                 Sets default dialog properties by arguments which were set using   link  builder FragmentActivity               protected AlertDialog Builder setDialogDefaults AlertDialog Builder builder            args   getArguments            activity   getActivity             if  args containsKey  title                  builder setTitle args getCharSequence  title                        if  args containsKey  message                  CharSequence message   args getCharSequence  message                builder setMessage message                      if  args containsKey  viewId                  builder setView getActivity   getLayoutInflater   inflate args getInt  viewId    null                       if  args containsKey  positiveButtonText                  builder setPositiveButton args getCharSequence  positiveButtonText     dialog  which  - gt                    onButtonClicked  positiveButtonListener   which                                      if  args containsKey  negativeButtonText                  builder setNegativeButton args getCharSequence  negativeButtonText     dialog  which  - gt                    onButtonClicked  negativeButtonListener   which                                      if  args containsKey  neutralButtonText                  builder setNeutralButton args getCharSequence  neutralButtonText     dialog  which  - gt                    onButtonClicked  neutralButtonListener   which                                      if  args containsKey  items                  builder setItems args getStringArray  items     dialog  which  - gt                    onButtonClicked  itemClickListener   which                                          formatter off            FIXME this a pretty hacky workaround  we don t want to show the dialog if onClickListener of one of the dialog s button click listener were lost                  the problem is  that there is no  known  solution for parceling a OnClickListener in the long term  only for state changes like orientation change                   but not if the Activity was completely lost          if                    args getParcelable  positiveButtonListener      null  amp  amp    args getParcelable  positiveButtonListener   instanceof ParcelableOnClickListener                       args getParcelable  negativeButtonListener      null  amp  amp    args getParcelable  negativeButtonListener   instanceof ParcelableOnClickListener                       args getParcelable  neutralButtonListener      null  amp  amp    args getParcelable  neutralButtonListener   instanceof ParcelableOnClickListener                       args getParcelable  itemClickListener      null  amp  amp    args getParcelable  itemClickListener   instanceof ParcelableOnClickListener                           new DebugMessage  Forgot onClickListener  Needs to be dismissed                         logLevel DebugMessage LogLevel VERBOSE                       show                try                   dismissAllowingStateLoss                  catch  NullPointerException   IllegalStateException ignored                           formatter on          return builder             public interface OnDismissListener           void onDismiss AlertDialogFragment dialogFragment              public interface OnClickListener           void onClick AlertDialogFragment dialogFragment  int which              protected void onButtonClicked String buttonKey  int which            ParcelableOnClickListener parcelableOnClickListener   getArguments   getParcelable buttonKey           if  parcelableOnClickListener    null                parcelableOnClickListener onClick this  which                           region Convenience Builder Pattern class almost similar to AlertDialog Builder                                                                                                           public AlertDialogFragment builder FragmentActivity activity            this activity   activity          this args   new Bundle            return this             public AlertDialogFragment addArguments Bundle bundle            args putAll bundle           return this             public AlertDialogFragment setTitle int titleStringId            return setTitle activity getString titleStringId               public AlertDialogFragment setTitle CharSequence title            args putCharSequence  title   title           return this             public AlertDialogFragment setMessage int messageStringId            return setMessage activity getString messageStringId               public AlertDialogFragment setMessage CharSequence message            args putCharSequence  message   message           return this             public AlertDialogFragment setPositiveButton int textStringId  OnClickListener onClickListener            return setPositiveButton activity getString textStringId   onClickListener              public AlertDialogFragment setPositiveButton CharSequence text  AlertDialogFragment OnClickListener onClickListener            args putCharSequence  positiveButtonText   text           args putParcelable  positiveButtonListener   createParcelableOnClickListener onClickListener            return this             public AlertDialogFragment setNegativeButton int textStringId  AlertDialogFragment OnClickListener onClickListener            return setNegativeButton activity getString textStringId   onClickListener              public AlertDialogFragment setNegativeButton CharSequence text  AlertDialogFragment OnClickListener onClickListener            args putCharSequence  negativeButtonText   text           args putParcelable  negativeButtonListener   createParcelableOnClickListener onClickListener            return this             public AlertDialogFragment setNeutralButton int textStringId  AlertDialogFragment OnClickListener onClickListener            return setNeutralButton activity getString textStringId   onClickListener              public AlertDialogFragment setNeutralButton CharSequence text  AlertDialogFragment OnClickListener onClickListener            args putCharSequence  neutralButtonText   text           args putParcelable  neutralButtonListener   createParcelableOnClickListener onClickListener            return this             public AlertDialogFragment setOnDismissListener OnDismissListener onDismissListener            if  onDismissListener    null                return this                     Parcelable p   new ParcelableOnDismissListener                  Override             public void onDismiss AlertDialogFragment dialogFragment                    onDismissListener onDismiss dialogFragment                                    args putParcelable  onDismissListener   p           return this             public AlertDialogFragment setItems String   items  AlertDialogFragment OnClickListener onClickListener            args putStringArray  items   items           args putParcelable  itemClickListener   createParcelableOnClickListener onClickListener            return this             public AlertDialogFragment setView int viewId            args putInt  viewId   viewId           return this             public AlertDialogFragment setGravity int gravity            args putInt  gravity   gravity           return this             public AlertDialogFragment setTag String tag            this tag   tag          return this             public AlertDialogFragment create             setArguments args           return AlertDialogFragment this             public AlertDialogFragment show             create            try               super show activity getSupportFragmentManager    tag                     catch  IllegalStateException e1                                    this whole part is used in order to attempt to show the dialog if an                  link IllegalStateException  was thrown  it s kinda comparable to                  link FragmentTransaction commitAllowingStateLoss                    So you can remove all those dirty hacks if you are sure that you are always                properly showing dialogs in the right moments                              new DebugMessage  got IllegalStateException attempting to show dialog  trying to hack around                         logLevel DebugMessage LogLevel WARN                       exception e1                       show                 try                   Field mShownByMe   DialogFragment class getDeclaredField  mShownByMe                    mShownByMe setAccessible true                   mShownByMe set this  true                   Field mDismissed   DialogFragment class getDeclaredField  mDismissed                    mDismissed setAccessible true                   mDismissed set this  false                             catch  Exception e2                    new DebugMessage  error while showing dialog                            exception e2                           logLevel DebugMessage LogLevel ERROR                           show                              FragmentTransaction transaction   activity getSupportFragmentManager   beginTransaction                transaction add this  tag               transaction commitAllowingStateLoss       FIXME hacky and unpredictable workaround                   return AlertDialogFragment this              Override     public int show FragmentTransaction transaction  String tag            throw new NoSuchMethodError  Please use AlertDialogFragment show                   Override     public void show FragmentManager manager  String tag            throw new NoSuchMethodError  Please use AlertDialogFragment show                  protected ParcelableOnClickListener createParcelableOnClickListener AlertDialogFragment OnClickListener onClickListener            if  onClickListener    null                return null                     return new ParcelableOnClickListener                  Override             public void onClick AlertDialogFragment dialogFragment  int which                    onClickListener onClick dialogFragment  which                                                  Parcelable OnClickListener  can be remembered on screen rotation              public abstract static class ParcelableOnClickListener extends ResultReceiver implements AlertDialogFragment OnClickListener           public static final Creator lt ResultReceiver gt  CREATOR   ResultReceiver CREATOR           ParcelableOnClickListener                 super null                       Override         public abstract void onClick AlertDialogFragment dialogFragment  int which                         Parcelable OnDismissListener  can be remembered on screen rotation              public abstract static class ParcelableOnDismissListener extends ResultReceiver implements AlertDialogFragment OnDismissListener           public static final Creator lt ResultReceiver gt  CREATOR   ResultReceiver CREATOR           ParcelableOnDismissListener                 super null                       Override         public abstract void onDismiss AlertDialogFragment dialogFragment                                                                                                                       endregion     USAGE     showing a normal alert dialog with state loss on configuration changes  like device rotation  new AlertDialog Builder getActivity             setTitle  Are you sure   1             setMessage  Do you really want to do this             setPositiveButton  Yes    dialog  which  - gt  Toast makeText getContext     Yes clicked   Toast LENGTH SHORT  show             setNegativeButton  Cancel   null           show        showing a dialog fragment using the helper class with no state loss on configuration changes new AlertDialogFragment builder getActivity             setTitle  Are you sure   2             setMessage  Do you really want to do this             setPositiveButton  Yes    dialog  which  - gt  Toast makeText getContext     Yes clicked   Toast LENGTH SHORT  show             setNegativeButton  Cancel   null           show      I am posting this here not only to share my solution  but also because I wanted to ask you people for your opinion  Is this approach legit or problematic to some extent

User · Answer

DialogFragment is basically a Fragment that can be used as a dialog   Using DialogFragment over Dialog due to the following reasons   DialogFragment is automatically re-created after configuration changes and save  amp  restore flow DialogFragment inherits full Fragment   s lifecycle No more IllegalStateExceptions and leaked window crashes  This was pretty common when the activity was destroyed with the Alert Dialog still there    More detail

User · Answer

Use DialogFragment over AlertDialog      Since the introduction of API level 13    the showDialog method from Activity is deprecated  Invoking a dialog elsewhere in code is not advisable since you will have to manage the the dialog yourself  e g  orientation change   Difference DialogFragment - AlertDialog  Are they so much different  From Android reference regarding DialogFragment       A DialogFragment is a fragment that displays a dialog window  floating on top of its   activity s window  This fragment contains a Dialog object  which it   displays as appropriate based on the fragment s state  Control of the   dialog  deciding when to show  hide  dismiss it  should be done   through the API here  not with direct calls on the dialog   Other notes   Fragments are a natural evolution in the Android framework due to the diversity of devices with different screen sizes   DialogFragments and Fragments are made available in the support library which makes the class usable in all current used versions of Android

User · Answer

You can create generic DialogFragment subclasses like YesNoDialog and OkDialog  and pass in title and message if you use dialogs a lot in your app     public class YesNoDialog extends DialogFragment       public static final String ARG TITLE    YesNoDialog Title       public static final String ARG MESSAGE    YesNoDialog Message        public YesNoDialog                      Override     public Dialog onCreateDialog Bundle savedInstanceState                Bundle args   getArguments            String title   args getString ARG TITLE           String message   args getString ARG MESSAGE            return new AlertDialog Builder getActivity                 setTitle title               setMessage message               setPositiveButton android R string yes  new DialogInterface OnClickListener                                  Override                 public void onClick DialogInterface dialog  int which                                        getTargetFragment   onActivityResult getTargetRequestCode    Activity RESULT OK  null                                                 setNegativeButton android R string no  new DialogInterface OnClickListener                                  Override                 public void onClick DialogInterface dialog  int which                                        getTargetFragment   onActivityResult getTargetRequestCode    Activity RESULT CANCELED  null                                                 create              Then call it using the following       DialogFragment dialog   new YesNoDialog        Bundle args   new Bundle        args putString YesNoDialog ARG TITLE  title       args putString YesNoDialog ARG MESSAGE  message       dialog setArguments args       dialog setTargetFragment this  YES NO CALL       dialog show getFragmentManager     tag      And handle the result in onActivityResult

User · Answer

Use Dialog for simple yes or no dialogs   When you need more complex views in which you need get hold of the lifecycle such as oncreate  request permissions  any life cycle override I would use a dialog fragment  Thus you separate the permissions and any other code the dialog needs to operate without having to communicate with the calling activity

User · Answer

DialogFragment comes with the power of a dialog and a Fragment  Basically all the lifecycle events are managed very well with DialogFragment automatically  like change in screen configuration etc

User · Answer

May I suggest a little simplification of  ashishduh s answer   public class AlertDialogFragment extends DialogFragment   public static final String ARG TITLE    AlertDialog Title   public static final String ARG MESSAGE    AlertDialog Message    public static void showAlert String title  String message  Fragment targetFragment        DialogFragment dialog   new AlertDialogFragment        Bundle args   new Bundle        args putString ARG TITLE  title       args putString ARG MESSAGE  message       dialog setArguments args       dialog setTargetFragment targetFragment  0       dialog show targetFragment getFragmentManager     tag       public AlertDialogFragment        NonNull  Override public AlertDialog onCreateDialog Bundle savedInstanceState        Bundle args   getArguments        String title   args getString ARG TITLE           String message   args getString ARG MESSAGE            return new AlertDialog Builder getActivity                 setTitle title               setMessage message               setPositiveButton android R string ok  new DialogInterface OnClickListener                                  Override                 public void onClick DialogInterface dialog  int which                                        getTargetFragment   onActivityResult getTargetRequestCode    Activity RESULT OK  null                                                 create        It removes the need for the user  of the class  to be familiar with the internals of the component and makes usage really simple   AlertDialogFragment showAlert title  message  this     P S  In my case I needed a simple alert dialog so that s what I created  You can apply the approach to a Yes No or any other type you need

[android] Android DialogFragment vs Dialog

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