How to start Fragment from an Activity

Question

I already want to start my RecipientFragment from my MainActivity and pass data onto the Fragment from my MainActivity  Here is the code that I have implemented  But the fragment does not start   Bundle bundle   new Bundle    bundle putString ParseConstants KEY FILE TYPE  fileType   RecipientsFragment keyfile   new RecipientsFragment    keyfile setArguments bundle   Fragment newFragment   new RecipientsFragment    FragmentTransaction transaction   getFragmentManager   beginTransaction    transaction commit      I also want to know how to pass intent setData and get that data in Fragment  Currently I have below code   RecipientFragment  mMediaUri   getActivity   getIntent   getData      MainActivity  Intent recipientsIntent   new Intent this  RecipientsFragment class           recipientsIntent setData mMediaUri

User · Answer

Firstly  you start Activities and Services with an intent  you start fragments with fragment transactions  Secondly  your transaction isnt doing anything   Change it to something like   FragmentTransaction transaction   getFragmentManager        transaction beginTransaction            replace R layout container  newFragment     lt ---replace a view in your layout  id  container  with the newFragment           commit

User · Answer

In order to accomplish this  it is best to design fragment construct to receive that data and save that data in its bundle arguments      class FragmentA extends Fragment      public static FragmentA newInstance YourDataClass data                 FragmentA f   new FragmentA                Bundle b   new Bundle                b putString  data   data               f setArguments b                return f                    In order to start the fragment from the class  you can do the following   Fragment newFragment   FragmentA newInstance objectofyourclassdata   FragmentTransaction transaction   getSupportFragmentManager   beginTransaction        Replace whatever is in the fragment container view with this fragment     and add the transaction to the back stack transaction replace R id fragment container  newFragment   transaction addToBackStack null       Commit the transaction transaction commit      However  the data class must be parceable or serializable   For full information on fragments and best practices on use of fragments  please spend some time on official docs  it is super useful  at least my experience  https   developer android com guide components fragments java

User · Answer

You Can Start Activity and attach RecipientsFragment on it   but you cant start Fragment

User · Answer

You can either add or replace fragment in your activity  Create a FrameLayout in activity layout xml file   Then do this in your activity to add fragment   FragmentManager manager   getFragmentManager    FragmentTransaction transaction   manager beginTransaction    transaction add R id container YOUR FRAGMENT NAME YOUR FRAGMENT STRING TAG   transaction addToBackStack null   transaction commit      And to replace fragment do this   FragmentManager manager   getFragmentManager    FragmentTransaction transaction   manager beginTransaction    transaction replace R id container YOUR FRAGMENT NAME YOUR FRAGMENT STRING TAG   transaction addToBackStack null   transaction commit      See Android documentation on adding a fragment to an activity or following related questions on SO   Difference between add    replace    and addToBackStack    Basic difference between add   and replace   method of Fragment  Difference between add    amp  replace   with Fragment  39 s lifecycle

User · Answer

Simple way   Create a new java class  public class ActivityName extends FragmentActivity    Override  public void onCreate Bundle savedInstanceState       super onCreate savedInstanceState       if  savedInstanceState    null       getSupportFragmentManager   beginTransaction                add android R id content  new Fragment name which you wantto open    commit           in your activity where u want to call fragment   Intent i   new Intent Currentactivityname this ActivityName class    startActivity i      Another Method   Place frame layout in your activity where u want to open fragment     lt FrameLayout         android id    id frameLayout          android layout width  match parent          android layout height  wrap content  gt       lt  FrameLayout gt   Paste this code where u want to open fragment       Fragment mFragment   null          mFragment   new Name of fragment which you want to open            FragmentManager fragmentManager   getSupportFragmentManager            fragmentManager beginTransaction                    replace R id frameLayout  mFragment  commit

User · Answer

Another ViewGroup   A fragment is a ViewGroup which can be shown in an Activity  But it needs a Container  The container can be any Layout  FragmeLayout  LinearLayout  etc  It does not matter         Step 1      Define Activity Layout     lt RelativeLayout xmlns android  http   schemas android com apk res android     android layout width  match parent     android layout height  match parent  gt      lt FrameLayout        android id    id fragmentHolder         android layout width  match parent         android layout height  wrap content        gt   lt  RelativeLayout gt    Step 2      Define Fragment Layout     lt LinearLayout xmlns android  http   schemas android com apk res android      android layout width  match parent      android layout height  match parent      android gravity  center      android orientation  vertical  gt       lt EditText        android id    id user         android layout width  wrap content         android layout height  wrap content   gt       lt EditText        android id    id password         android layout width  wrap content         android layout height  wrap content         android inputType  textPassword   gt       lt Button        android id    id login         android layout width  wrap content         android layout height  wrap content         android text  Login   gt   lt  LinearLayout gt    Step 3      Create Fragment class   public class LoginFragment extends Fragment         private Button login      private EditText username  password       public static LoginFragment getInstance String username          Bundle bundle   new Bundle           bundle putInt  USERNAME   username          LoginFragment fragment   new LoginFragment           fragment setArguments bundle          return fragment              Override     public View onCreateView LayoutInflater inflater  ViewGroup parent  Bundle savedInstanceState          View view   inflater inflate R layout login fragment  parent  false          login   view findViewById R id login          username   view findViewById R id user          password   view findViewById R id password          String name   getArguments   getInt  USERNAME           username setText username          return view             Step 4      Add fragment in Activity   public class ActivityB extends AppCompatActivity      private Fragment currentFragment       Override    protected void onCreate Bundle savedInstanceState            super onCreate savedInstanceState          setContentView R layout activity main           currentFragment   LoginFragment getInstance  Rohit           getSupportFragmentManager                    beginTransaction                    add R id fragmentHolder  currentFragment   LOGIN TAG                    commit              Demo Project   This is code is very basic  If you want to learn more advanced topics in Fragment then you can check out these resources   Woof - Learn the fragment right way My Android Garage

[android] How to start Fragment from an Activity

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