Button ruft Hauptaktivität aus dem Fragment heraus

Question

Ich habe einen Button zum Menü hinzugefügt, der mich vom Fragment zur Hauptaktivität bringen soll, aber ich weiß jetzt nicht, wie ich es implementieren soll?

Ich legte eine Switch-Anweisung innerhalb onOptionsItemSelected. Fragment wehre ich Haupttätigkeit nennen:

public class DetailFragment extends Fragment 
    implements LoaderManager.LoaderCallbacks<Cursor> { 

    //Fragment detailFragment= new Fragment(this); 

    // callback methods implemented by MainActivity 
    public interface DetailFragmentListener { 
     void onContactDeleted(); // called when a contact is deleted 

     // pass Uri of contact to edit to the DetailFragmentListener 
    void onEditContact(Uri contactUri); 
    } 

    private static final int CONTACT_LOADER = 0; // identifies the Loader 

    private DetailFragmentListener listener; // MainActivity 
    private Uri contactUri; // Uri of selected contact 

    private TextView nameTextView; // displays contact's name 
    private TextView phoneTextView; // displays contact's phone 
    private TextView emailTextView; // displays contact's email 
    private TextView specialtyTextView; // displays contact's 
    private TextView cityTextView; // displays contact's city 
    private TextView chargeTextView; // displays contact's state 
    private TextView noteTextView; // displays contact's zip 
    private Button callButton; //Nuha 
    private Button emailButton; 
    private Button smsButton; 

    // set DetailFragmentListener when fragment attached 
    @Override 
    public void onAttach(Context context) { 
    super.onAttach(context); 
     listener = (DetailFragmentListener) context; 
    } 

     // remove DetailFragmentListener when fragment detached 
     @Override 
     public void onDetach() { 
     super.onDetach(); 
     listener = null; 
    } 

    // called when DetailFragmentListener's view needs to be created 
     @Override 
    public View onCreateView(
     LayoutInflater inflater, ViewGroup container, 
     Bundle savedInstanceState) { 
    super.onCreateView(inflater, container, savedInstanceState); 
    setHasOptionsMenu(true); // this fragment has menu items to display 

    // get Bundle of arguments then extract the contact's Uri 
    Bundle arguments = getArguments(); 

    if (arguments != null) 
    contactUri = arguments.getParcelable(MainActivity.CONTACT_URI); 

    // inflate DetailFragment's layout 
    View view = 
      inflater.inflate(R.layout.fragment_detail, container, false); 

    // get the EditTexts 
    nameTextView = (TextView) view.findViewById(R.id.nameTextView); 
    phoneTextView = (TextView) view.findViewById(R.id.phoneTextView); 
    emailTextView = (TextView) view.findViewById(R.id.emailTextView); 
    specialtyTextView = (TextView) view.findViewById(R.id.specialtyTextView); 
    cityTextView = (TextView) view.findViewById(R.id.cityTextView); 
    chargeTextView = (TextView) view.findViewById(R.id.chargeTextView); 
    noteTextView = (TextView) view.findViewById(R.id.noteTextView); 
    callButton = (Button) view.findViewById(R.id.callbutton);//nuha 
    emailButton=(Button) view.findViewById(R.id.sendEmailbutton); 
    smsButton=(Button)view.findViewById(R.id.smsbutton); 
    // load the contact 
    getLoaderManager().initLoader(CONTACT_LOADER, null, this); 

    addListenerOnButton(view);//Nuha buttons 

    Animation animation = AnimationUtils.loadAnimation(getContext(),R.anim.pop_enter);//Animate details Nuha 
    nameTextView.startAnimation(animation); 
    phoneTextView.startAnimation(animation); 
    emailTextView.startAnimation(animation); 
    emailButton.startAnimation(animation); 
    specialtyTextView.startAnimation(animation); 
    cityTextView.startAnimation(animation); 
    chargeTextView.startAnimation(animation); 
    noteTextView.startAnimation(animation); 
    callButton.startAnimation(animation); 
    emailButton.startAnimation(animation);//till here 
    return view; 
    } 

    // display this fragment's menu items 
    @Override 
    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) { 
    super.onCreateOptionsMenu(menu, inflater); 
    inflater.inflate(R.menu.fragment_details_menu, menu); 
    } 

// handle menu item selections 
@Override 
    public boolean onOptionsItemSelected(MenuItem item) { 
    switch (item.getItemId()) { 
    case R.id.action_edit: 
     listener.onEditContact(contactUri); // pass Uri to listener 
     return true; 
    case R.id.action_home:////home button 
     //What should I put here ?? 
     return true; 
    case R.id.action_delete: 
     deleteContact(); 
     return true; 
    } 

    return super.onOptionsItemSelected(item); 
} 

Mein mainactivity:

public class MainActivity extends AppCompatActivity 
    implements ContactsFragment.ContactsFragmentListener, 
DetailFragment.DetailFragmentListener, 
AddEditFragment.AddEditFragmentListener { 

// key for storing a contact's Uri in a Bundle passed to a fragment 
    public static final String CONTACT_URI = "contact_uri"; 

    private ContactsFragment contactsFragment; // displays contact list 

    // display ContactsFragment when MainActivity first loads 
    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); 
    setSupportActionBar(toolbar); 

    // if layout contains fragmentContainer, the phone layout is in use; 
    // create and display a ContactsFragment 
    if (savedInstanceState == null && 
    findViewById(R.id.fragmentContainer) != null) { 
    // create ContactsFragment 


    //Nuha animation 
    // add the fragment to the FrameLayout 
    ///Nuha try animation 
    FragmentManager fragmentManager = getSupportFragmentManager(); 
    FragmentTransaction transaction = fragmentManager.beginTransaction(); 
    transaction.setCustomAnimations(R.anim.enter, R.anim.exit, R.anim.pop_enter, R.anim.pop_exit); 
    contactsFragment = new ContactsFragment(); 

    transaction.replace(R.id.fragmentContainer, contactsFragment); 
    transaction.addToBackStack(null); 
     transaction.commit(); 



     } 
     else { 
    contactsFragment = 
     (ContactsFragment) getSupportFragmentManager(). 
      findFragmentById(R.id.contactsFragment); 
     } 
    } 

    // display DetailFragment for selected contact 
    @Override 
    public void onContactSelected(Uri contactUri) { 
    if (findViewById(R.id.fragmentContainer) != null) // phone 
    displayContact(contactUri, R.id.fragmentContainer); 
    else { // tablet 
    // removes top of back stack 
    getSupportFragmentManager().popBackStack(); 

    displayContact(contactUri, R.id.rightPaneContainer); 
     } 
    } 

    // display AddEditFragment to add a new contact 
    @Override 
    public void onAddContact() { 
     if (findViewById(R.id.fragmentContainer) != null) // phone 
    displayAddEditFragment(R.id.fragmentContainer, null); 
     else // tablet 
    displayAddEditFragment(R.id.rightPaneContainer, null); 
     } 

    // display a contact 
    private void displayContact(Uri contactUri, int viewID) { 
    DetailFragment detailFragment = new DetailFragment(); 

    // specify contact's Uri as an argument to the DetailFragment 
    Bundle arguments = new Bundle(); 
    arguments.putParcelable(CONTACT_URI, contactUri); 
    detailFragment.setArguments(arguments); 

     // use a FragmentTransaction to display the DetailFragment 
     FragmentTransaction transaction = 
    getSupportFragmentManager().beginTransaction(); 
     transaction.replace(viewID, detailFragment); 
     transaction.addToBackStack(null); 
     transaction.commit(); // causes DetailFragment to display 
    } 

    // display fragment for adding a new or editing an existing contact 
    private void displayAddEditFragment(int viewID, Uri contactUri) { 
     AddEditFragment addEditFragment = new AddEditFragment(); 

     // if editing existing contact, provide contactUri as an argument 
     if (contactUri != null) { 
    Bundle arguments = new Bundle(); 
    arguments.putParcelable(CONTACT_URI, contactUri); 
    addEditFragment.setArguments(arguments); 
     } 

     // use a FragmentTransaction to display the AddEditFragment 
     FragmentTransaction transaction = 
    getSupportFragmentManager().beginTransaction(); 
     transaction.replace(viewID, addEditFragment); 
     transaction.addToBackStack(null); 
     transaction.commit(); // causes AddEditFragment to display 
    } 

    // return to contact list when displayed contact deleted 
    @Override 
    public void onContactDeleted() { 
     // removes top of back stack 
     getSupportFragmentManager().popBackStack(); 
     contactsFragment.updateContactList(); // refresh contacts 
    } 

    // display the AddEditFragment to edit an existing contact 
    @Override 
    public void onEditContact(Uri contactUri) { 
     if (findViewById(R.id.fragmentContainer) != null) // phone 
    displayAddEditFragment(R.id.fragmentContainer, contactUri); 

     else // tablet 
    displayAddEditFragment(R.id.rightPaneContainer, contactUri); 
    } 

    // update GUI after new contact or updated contact saved 
    @Override 
    public void onAddEditCompleted(Uri contactUri) { 
    // removes top of back stack 
    getSupportFragmentManager().popBackStack(); 
    contactsFragment.updateContactList(); // refresh contacts 

    if (findViewById(R.id.fragmentContainer) == null) { // tablet 
    // removes top of back stack 
    getSupportFragmentManager().popBackStack(); 

    // on tablet, display contact that was just added or edited 
    displayContact(contactUri, R.id.rightPaneContainer); 
     } 
    } 
// 
} 

Können Sie mir bitte helfen?

Edit: Dieses Fragment ist mit der Hauptaktivität verbunden. Ich möchte mit dem ursprünglichen Fragment zur Haupttätigkeit zurückkehren.

Answer 1

Wenn ich Ihre Frage richtig zu bekommen, das ist, was Sie in Ihrer Switch-Anweisung setzen müssen,

Intent mainActivityIntent = new Intent(getActivity(),MainActivity.class); 
startActivity(mainActivityIntent); 

kurze Erläuterung des Konstruktor Absicht

1. getActivity() gibt die mit dem Fragment verknüpfte Aktivität zurück. Die Aktivität ist ein Kontext (seit Activity extends Context).
2. MainActivity.class ist die Aktivität, zu der Sie zurückkehren möchten.

Hoffe, das hilft! :)

-Nach Sie die Frage- aktualisiert

Ich denke, das ist das, was Sie suchen How to get a Fragment to remove itself?

Answer 2

müssen Sie dies in Ihrer itenselected Option

Intent intent = new Intent(context, ActivityName.class); 
startActivity(intent); 

wo Kontext ist das Fragment, das Sie verwenden, und die nächste ist die Aktivität, die Sie gehen wollen.

Answer 3

Versuchen Sie dies. (Innen Fragment)

Intent intent = new Intent (getApplicationContext(),MainActivity.class); 
startActivity(intent);