Show dialog from fragment

Question

I have some fragments that need to show a regular dialog  On these dialogs the user can choose a yes no answer  and then the fragment should behave accordingly   Now  the Fragment class doesn t have an onCreateDialog   method to override  so I guess I have to implement the dialogs outside  in the containing Activity  It s ok  but then the Activity needs to report back the chosen answer somehow to the fragment  I could of course use a callback pattern here  so the fragment registers itself at the Activity with a listener class  and the Activity would report back the answer thru that  or something like that   But this seems to be quite a big mess for a simple task as displaying a  simple  yes-no dialog in a fragment  Also  this way my Fragment would be less self-contained   Is there some cleaner way to do this   Edit   The answer to this question doesn t really explain in detail how one should use DialogFragments to display dialogs from Fragments  So AFAIK  the way to go is    Display a Fragment  When needed  instantiate a DialogFragment  Set the original Fragment as the target of this DialogFragment  with  setTargetFragment    Show the DialogFragment with  show   from the original Fragment  When the user chooses some option on this DialogFragment  notify the original Fragment about this selection  e g  the user clicked  yes    you can get the reference of the original Fragment with  getTarget    Dismiss the DialogFragment

User · Answer

I must cautiously doubt the previously accepted answer that using a DialogFragment is the best option. The intended (primary) purpose of the DialogFragment seems to be to display fragments that are dialogs themselves, not to display fragments that have dialogs to display.

I believe that using the fragment's activity to mediate between the dialog and the fragment is the preferable option.

User · Answer

You should use a DialogFragment instead

User · Answer

I am a beginner myself and I honestly couldn t find a satisfactory answer that I could understand or implement   So here s an external link that I really helped me achieved what I wanted  It s very straight forward and easy to follow as well   http   www helloandroid com tutorials how-display-custom-dialog-your-android-application  THIS WHAT I TRIED TO ACHIEVE WITH THE CODE    I have a MainActivity that hosts a Fragment  I wanted a dialog to appear on top of the layout to ask for user input and then process the input accordingly   See a screenshot  Here s what the onCreateView of my fragment looks    Nullable  Override public View onCreateView LayoutInflater inflater   Nullable ViewGroup container   Nullable Bundle savedInstanceState         View rootView   inflater inflate R layout fragment home activity  container  false        Button addTransactionBtn   rootView findViewById R id addTransactionBtn        addTransactionBtn setOnClickListener new View OnClickListener              Override         public void onClick View view                Dialog dialog   new Dialog getActivity                 dialog setContentView R layout dialog trans               dialog setTitle  Add an Expense                dialog setCancelable true                dialog show                         I hope it will help you  Let me know if there s any confusion

User · Answer

public void showAlert           AlertDialog Builder alertDialog   new AlertDialog Builder getActivity          LayoutInflater inflater   getActivity   getLayoutInflater         View alertDialogView   inflater inflate R layout test dialog  null        alertDialog setView alertDialogView         TextView textDialog    TextView  alertDialogView findViewById R id text testDialogMsg        textDialog setText questionMissing         alertDialog setPositiveButton  Ok   new DialogInterface OnClickListener              public void onClick DialogInterface dialog  int which                 dialog cancel                             alertDialog show         where  test dialog is of xml custom

User · Answer

public static void OpenDialog  Activity activity  DialogFragment fragment        final FragmentManager fm     FragmentActivity activity  getSupportFragmentManager         fragment show fm   tag

User · Answer

For me  it was the following-   MyFragment   public class MyFragment extends Fragment implements MyDialog Callback       ShowDialog activity showDialog        Override     public void onAttach Activity activity                super onAttach activity           try                       activity showDialog    ShowDialog activity                    catch ClassCastException e                        Log e this getClass   getSimpleName     ShowDialog interface needs to be     implemented by Activity    e               throw e                        Override     public void onClick View view                             MyDialog dialog   new MyDialog            dialog setTargetFragment this  1     request code         activity showDialog showDialog dialog                           Override     public void accept                   accept             Override     public void decline                   decline             Override     public void cancel                   cancel            MyDialog   public class MyDialog extends DialogFragment implements View OnClickListener       private EditText mEditText      private Button acceptButton      private Button rejectButton      private Button cancelButton       public static interface Callback               public void accept            public void decline            public void cancel               public MyDialog                    Empty constructor required for DialogFragment             Override     public View onCreateView LayoutInflater inflater  ViewGroup container  Bundle savedInstanceState                View view   inflater inflate R layout dialogfragment  container           acceptButton    Button  view findViewById R id dialogfragment acceptbtn           rejectButton    Button  view findViewById R id dialogfragment rejectbtn           cancelButton    Button  view findViewById R id dialogfragment cancelbtn           acceptButton setOnClickListener this           rejectButton setOnClickListener this           cancelButton setOnClickListener this           getDialog   setTitle R string dialog title           return view              Override     public void onClick View v                Callback callback   null          try                       callback    Callback  getTargetFragment                      catch  ClassCastException e                        Log e this getClass   getSimpleName     Callback of this class must be implemented by target fragment    e               throw e                     if  callback    null                        if  v    acceptButton                                   callback accept                    this dismiss                              else if  v    rejectButton                                callback decline                    this dismiss                              else if  v    cancelButton                                callback cancel                    this dismiss                                      Activity   public class MyActivity extends ActionBarActivity implements ShowDialog                Override     public void showDialog DialogFragment dialogFragment                FragmentManager fragmentManager   getSupportFragmentManager            dialogFragment show fragmentManager   dialog              DialogFragment layout    lt  xml version  1 0  encoding  utf-8   gt   lt RelativeLayout xmlns android  http   schemas android com apk res android      android layout width  wrap content      android layout height  wrap content      android layout gravity  center      android orientation  vertical   gt        lt TextView         android id    id dialogfragment textview          android layout width  wrap content          android layout height  wrap content          android layout marginTop  20dp          android layout centerHorizontal  true          android layout marginBottom  10dp          android text   string example   gt        lt Button         android id    id dialogfragment acceptbtn          android layout width  200dp          android layout height  wrap content          android layout marginTop  20dp          android layout centerHorizontal  true          android layout below    id dialogfragment textview          android text   string accept            gt        lt Button         android id    id dialogfragment rejectbtn          android layout width  200dp          android layout height  wrap content          android layout marginTop  10dp          android layout alignLeft    id dialogfragment acceptbtn          android layout below    id dialogfragment acceptbtn          android text   string decline    gt         lt Button         android id    id dialogfragment cancelbtn          android layout width  200dp          android layout height  wrap content          android layout marginTop  10dp          android layout marginBottom  20dp          android layout alignLeft    id dialogfragment rejectbtn          android layout below    id dialogfragment rejectbtn          android text   string cancel    gt         lt Button         android id    id dialogfragment heightfixhiddenbtn          android layout width  200dp          android layout height  20dp          android layout marginTop  10dp          android layout marginBottom  20dp          android layout alignLeft    id dialogfragment cancelbtn          android layout below    id dialogfragment cancelbtn          android background   android color transparent          android enabled  false          android text       gt   lt  RelativeLayout gt    As the name dialogfragment heightfixhiddenbtn shows  I just couldn t figure out a way to fix that the bottom button s height was cut in half despite saying wrap content  so I added a hidden button to be  cut  in half instead  Sorry for the hack

User · Answer

Here is a full example of a yes no DialogFragment   The class   public class SomeDialog extends DialogFragment         Override     public Dialog onCreateDialog Bundle savedInstanceState            return new AlertDialog Builder getActivity                 setTitle  Title                setMessage  Sure you wanna do this                 setNegativeButton android R string no  new OnClickListener                      Override                 public void onClick DialogInterface dialog  int which                           do nothing  will close dialog                                                setPositiveButton android R string yes   new OnClickListener                      Override                 public void onClick DialogInterface dialog  int which                           do something                                               create              To start dialog           FragmentTransaction ft   getSupportFragmentManager   beginTransaction               Create and show the dialog          SomeDialog newFragment   new SomeDialog             newFragment show ft   dialog      You could also let the class implement onClickListener and use that instead of embedded listeners   Callback to Activity  If you want to implement callback this is how it is done In your activity   YourActivity extends Activity implements OnFragmentClickListener   and   Override public void onFragmentClick int action  Object object        switch action            case SOME ACTION            Do your action here         break            The callback class   public interface OnFragmentClickListener       public void onFragmentClick int action  Object object       Then to perform a callback from a fragment you need to make sure the listener is attached like this    Override public void onAttach Activity activity        super onAttach activity       try           mListener    OnFragmentClickListener  activity        catch  ClassCastException e            throw new ClassCastException activity toString       must implement listeners               And a callback is performed like this   mListener onFragmentClick SOME ACTION  null      null or some important object as second parameter

[android] Show dialog from fragment?

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