如何通过代码设置Fragment标签？

add

replace

Fragment fragmentA = new FragmentA();
getFragmentManager().beginTransaction()
    .replace(R.id.MainFrameLayout,fragmentA,\"YOUR_TARGET_FRAGMENT_TAG\")
    .addToBackStack(\"YOUR_SOURCE_FRAGMENT_TAG\").commit(); 

    android:tag=\"unique_tag\"

List<Fragment> allFragments = getSupportFragmentManager().getFragments();

List<Fragment> allFragments = getFragmentManager().getFragments();

   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\");
        }
    }
}

public class MyFragment extends Fragment {
 private String _myTag;
 public void setMyTag(String value)
 {
   if(\"\".equals(value))
     return;
   _myTag = value;
 }
 //other code goes here
}

 MyFragment mfrag= new MyFragment();
 mfrag.setMyTag(\"TAG_GOES_HERE\");
 sectionPagerAdapter.AddFragment(mfrag);

Fragment

    final Bundle args = new Bundle();
    args.putString(\"TAG\", \"my tag\");
    fragment.setArguments(args);