How to set a Fragment tag by code

Question

I haven t found something like setTag String tagName  method in the Fragment class  The only way to set a Fragment tag that I have found is by doing a FragmentTransaction and passing a tag name as parameter   Is this the only way to explicitly set a Fragment tag by code

User · Answer

You can set tag to fragment in this way   Fragment fragmentA   new FragmentA    getFragmentManager   beginTransaction        replace R id MainFrameLayout fragmentA  YOUR TARGET FRAGMENT TAG        addToBackStack  YOUR SOURCE FRAGMENT TAG   commit

User · Answer

Nowadays there s a simpler way to achieve this if you are using a DialogFragment  not a Fragment   val yourDialogFragment   YourDialogFragment   yourDialogFragment show      activity supportFragmentManager       quot YOUR TAG FRAGMENT quot     Under the hood  the show   method does create a FragmentTransaction and adds the tag by using the add   method  But it s much more convenient to use the show   method in my opinion  You could shorten it for Fragment too  by using a Kotlin Extension

User · Answer

I know it s been 6 years ago but if anyone is facing the same problem do like I ve done   Create a custom Fragment Class with a tag field   public class MyFragment extends Fragment    private String  myTag   public void setMyTag String value        if    equals value        return      myTag   value        other code goes here     Before adding the fragment to the sectionPagerAdapter set the tag just like that    MyFragment mfrag  new MyFragment     mfrag setMyTag  TAG GOES HERE     sectionPagerAdapter AddFragment mfrag

User · Answer

Yes  So the only way is at transaction time  e g  using add  replace  or as part of the layout   I determined this through an examination of the compatibility sources as I briefly looked for similar at some point in the past

User · Answer

This is the best way I have found       public class MainActivity extends AppCompatActivity        Override     public void onCreate Bundle savedInstanceState            super onCreate savedInstanceState           if  savedInstanceState    null                 Let s first dynamically add a fragment into a frame container           getSupportFragmentManager   beginTransaction                   replace R id flContainer  new DemoFragment     SOMETAG                  commit                 Now later we can lookup the fragment by tag           DemoFragment fragmentDemo    DemoFragment                 getSupportFragmentManager   findFragmentByTag  SOMETAG

User · Answer

You can provide a tag inside your activity layout xml file   Supply the android tag attribute with a unique string   Just as you would assign an id in a layout xml       android tag  unique tag    link to developer guide

User · Answer

You can also get all fragments like this   For v4 fragmets  List lt Fragment gt  allFragments   getSupportFragmentManager   getFragments      For app fragment  List lt Fragment gt  allFragments   getFragmentManager   getFragments

User · Answer

You can add the tag as a property for the Fragment arguments  It will be automatically restored if the fragment is destroyed and then recreated by the OS    Example -      final Bundle args   new Bundle        args putString  TAG    my tag        fragment setArguments args

[android] How to set a Fragment tag by code?

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