Come get elementi nel cassetto di navigazione per modificare la visualizzazione

Vorrei fare un'applicazione semplice con un cassetto di navigazione, in grado di aprire altre viste (News, Informazioni, Galleria, Contatto ecc.). Così ho aperto l'ultimo Android Studio, ha fatto un nuovo progetto compatibile con API8> API19, per get la massima portta.

Ho scelto il cassetto di navigazione preimpostato e la finitura cliccata. Ho capito di cambiare i nomi degli elementi nel cassetto di navigazione, ma come posso get questi elementi per redirect a una nuova visualizzazione?

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  • Ho provato a implementare il setOnItemClickListener nella MainActivity come dice il sito del cassetto di navigazione su http://developer.android.com . Ma non riesco a capire come tutti si legano e non funziona.

    tl; dr: Ho bisogno di aiuto per rendere gli elementi nel cassetto di navigazione lanciare una nuova vista / frammento e probabilmente una spiegazione su come funziona tutto.

    Ecco il progetto app (Android Studio) https://www.dropbox.com/s/qfz9oul62dzt3rr/NTI_SHOWCASE.zip

    MainActivity.java

    package com.christianarne.ntishowcase; import android.app.Activity; import android.content.Intent; import android.content.res.Resources; import android.graphics.Color; import android.graphics.drawable.ColorDrawable; import android.support.v7.app.ActionBarActivity; import android.support.v7.app.ActionBar; import android.support.v4.app.Fragment; import android.support.v4.app.FragmentManager; import android.content.Context; import android.os.Build; import android.os.Bundle; import android.text.Html; import android.view.Gravity; import android.view.LayoutInflater; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.view.ViewGroup; import android.support.v4.widget.DrawerLayout; import android.widget.ArrayAdapter; import android.widget.TextView; import android.widget.Toast; public class MainActivity extends ActionBarActivity implements NavigationDrawerFragment.NavigationDrawerCallbacks { private static final int SETTINGS_RESULT = 1; /** * Fragment managing the behaviors, interactions and presentation of the navigation drawer. */ private NavigationDrawerFragment mNavigationDrawerFragment; /** * Used to store the last screen title. For use in {@link #restoreActionBar()}. */ private CharSequence mTitle; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); ActionBar actionBar = getSupportActionBar(); actionBar.setBackgroundDrawable(new ColorDrawable(Color.rgb(0, 153, 204))); // set your desired color mNavigationDrawerFragment = (NavigationDrawerFragment) getSupportFragmentManager().findFragmentById(R.id.navigation_drawer); mTitle = getTitle(); // Set up the drawer. mNavigationDrawerFragment.setUp( R.id.navigation_drawer, (DrawerLayout) findViewById(R.id.drawer_layout)); } @Override public void onNavigationDrawerItemSelected(int position) { // update the main content by replacing fragments FragmentManager fragmentManager = getSupportFragmentManager(); fragmentManager.beginTransaction() .replace(R.id.container, PlaceholderFragment.newInstance(position + 1)) .commit(); } public void onSectionAttached(int number) { switch (number) { case 1: mTitle = getString(R.string.title_section1); break; case 2: mTitle = getString(R.string.title_section2); break; case 3: mTitle = getString(R.string.title_section3); break; } } public void restoreActionBar() { ActionBar actionBar = getSupportActionBar(); actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_STANDARD); actionBar.setTitle(mTitle); } @Override public boolean onCreateOptionsMenu(Menu menu) { if (!mNavigationDrawerFragment.isDrawerOpen()) { // Only show items in the action bar relevant to this screen // if the drawer is not showing. Otherwise, let the drawer // decide what to show in the action bar. getMenuInflater().inflate(R.menu.main, menu); restoreActionBar(); return true; } return super.onCreateOptionsMenu(menu); } @Override public boolean onOptionsItemSelected(MenuItem item) { // Handle action bar item clicks here. The action bar will // automatically handle clicks on the Home/Up button, so long // as you specify a parent activity in AndroidManifest.xml. int id = item.getItemId(); if (id == R.id.action_settings) { Intent intent = new Intent(this, SettingsActivity.class); startActivity(intent); return true; } if (id == R.id.action_example) { Intent intent_g = new Intent(this, Guide.class); startActivity(intent_g); } return super.onOptionsItemSelected(item); } /** * A placeholder fragment containing a simple view. */ public static class PlaceholderFragment extends Fragment { /** * The fragment argument representing the section number for this * fragment. */ private static final String ARG_SECTION_NUMBER = "section_number"; /** * Returns a new instance of this fragment for the given section * number. */ public static PlaceholderFragment newInstance(int sectionNumber) { PlaceholderFragment fragment = new PlaceholderFragment(); Bundle args = new Bundle(); args.putInt(ARG_SECTION_NUMBER, sectionNumber); fragment.setArguments(args); return fragment; } public PlaceholderFragment() { } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View rootView = inflater.inflate(R.layout.fragment_main, container, false); TextView textView = (TextView) rootView.findViewById(R.id.section_label); textView.setText(Integer.toString(getArguments().getInt(ARG_SECTION_NUMBER))); return rootView; } @Override public void onAttach(Activity activity) { super.onAttach(activity); ((MainActivity) activity).onSectionAttached( getArguments().getInt(ARG_SECTION_NUMBER)); } } } 

    NavigationDrawerFragment.java

     public class NavigationDrawerFragment extends Fragment { /** * Remember the position of the selected item. */ private static final String STATE_SELECTED_POSITION = "selected_navigation_drawer_position"; /** * Per the design guidelines, you should show the drawer on launch until the user manually * expands it. This shared preference tracks this. */ private static final String PREF_USER_LEARNED_DRAWER = "navigation_drawer_learned"; /** * A pointer to the current callbacks instance (the Activity). */ private NavigationDrawerCallbacks mCallbacks; /** * Helper component that ties the action bar to the navigation drawer. */ private ActionBarDrawerToggle mDrawerToggle; private DrawerLayout mDrawerLayout; private ListView mDrawerListView; private View mFragmentContainerView; private int mCurrentSelectedPosition = 0; private boolean mFromSavedInstanceState; private boolean mUserLearnedDrawer; public NavigationDrawerFragment() { } @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); // Read in the flag indicating whether or not the user has demonstrated awareness of the // drawer. See PREF_USER_LEARNED_DRAWER for details. SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(getActivity()); mUserLearnedDrawer = sp.getBoolean(PREF_USER_LEARNED_DRAWER, false); if (savedInstanceState != null) { mCurrentSelectedPosition = savedInstanceState.getInt(STATE_SELECTED_POSITION); mFromSavedInstanceState = true; } // Select either the default item (0) or the last selected item. selectItem(mCurrentSelectedPosition); } @Override public void onActivityCreated(Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); // Indicate that this fragment would like to influence the set of actions in the action bar. setHasOptionsMenu(true); } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { mDrawerListView = (ListView) inflater.inflate( R.layout.fragment_navigation_drawer, container, false); mDrawerListView.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { selectItem(position); } }); mDrawerListView.setAdapter(new ArrayAdapter<String>( getActionBar().getThemedContext(), android.R.layout.simple_list_item_1, android.R.id.text1, new String[]{ getString(R.string.title_section1), getString(R.string.title_section2), getString(R.string.title_section3), })); mDrawerListView.setItemChecked(mCurrentSelectedPosition, true); return mDrawerListView; } public boolean isDrawerOpen() { return mDrawerLayout != null && mDrawerLayout.isDrawerOpen(mFragmentContainerView); } /** * Users of this fragment must call this method to set up the navigation drawer interactions. * * @param fragmentId The android:id of this fragment in its activity's layout. * @param drawerLayout The DrawerLayout containing this fragment's UI. */ public void setUp(int fragmentId, DrawerLayout drawerLayout) { mFragmentContainerView = getActivity().findViewById(fragmentId); mDrawerLayout = drawerLayout; // set a custom shadow that overlays the main content when the drawer opens mDrawerLayout.setDrawerShadow(R.drawable.drawer_shadow, GravityCompat.START); // set up the drawer's list view with items and click listener ActionBar actionBar = getActionBar(); actionBar.setDisplayHomeAsUpEnabled(true); actionBar.setHomeButtonEnabled(true); // ActionBarDrawerToggle ties together the the proper interactions // between the navigation drawer and the action bar app icon. mDrawerToggle = new ActionBarDrawerToggle( getActivity(), /* host Activity */ mDrawerLayout, /* DrawerLayout object */ R.drawable.ic_drawer, /* nav drawer image to replace 'Up' caret */ R.string.navigation_drawer_open, /* "open drawer" description for accessibility */ R.string.navigation_drawer_close /* "close drawer" description for accessibility */ ) { @Override public void onDrawerClosed(View drawerView) { super.onDrawerClosed(drawerView); if (!isAdded()) { return; } getActivity().supportInvalidateOptionsMenu(); // calls onPrepareOptionsMenu() } @Override public void onDrawerOpened(View drawerView) { super.onDrawerOpened(drawerView); if (!isAdded()) { return; } if (!mUserLearnedDrawer) { // The user manually opened the drawer; store this flag to prevent auto-showing // the navigation drawer automatically in the future. mUserLearnedDrawer = true; SharedPreferences sp = PreferenceManager .getDefaultSharedPreferences(getActivity()); sp.edit().putBoolean(PREF_USER_LEARNED_DRAWER, true).commit(); } getActivity().supportInvalidateOptionsMenu(); // calls onPrepareOptionsMenu() } }; // If the user hasn't 'learned' about the drawer, open it to introduce them to the drawer, // per the navigation drawer design guidelines. if (!mUserLearnedDrawer && !mFromSavedInstanceState) { mDrawerLayout.openDrawer(mFragmentContainerView); } // Defer code dependent on restoration of previous instance state. mDrawerLayout.post(new Runnable() { @Override public void run() { mDrawerToggle.syncState(); } }); mDrawerLayout.setDrawerListener(mDrawerToggle); } private void selectItem(int position) { mCurrentSelectedPosition = position; if (mDrawerListView != null) { mDrawerListView.setItemChecked(position, true); } if (mDrawerLayout != null) { mDrawerLayout.closeDrawer(mFragmentContainerView); } if (mCallbacks != null) { mCallbacks.onNavigationDrawerItemSelected(position); } } @Override public void onAttach(Activity activity) { super.onAttach(activity); try { mCallbacks = (NavigationDrawerCallbacks) activity; } catch (ClassCastException e) { throw new ClassCastException("Activity must implement NavigationDrawerCallbacks."); } } @Override public void onDetach() { super.onDetach(); mCallbacks = null; } @Override public void onSaveInstanceState(Bundle outState) { super.onSaveInstanceState(outState); outState.putInt(STATE_SELECTED_POSITION, mCurrentSelectedPosition); } @Override public void onConfigurationChanged(Configuration newConfig) { super.onConfigurationChanged(newConfig); // Forward the new configuration the drawer toggle component. mDrawerToggle.onConfigurationChanged(newConfig); } @Override public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) { // If the drawer is open, show the global app actions in the action bar. See also // showGlobalContextActionBar, which controls the top-left area of the action bar. if (mDrawerLayout != null && isDrawerOpen()) { inflater.inflate(R.menu.global, menu); showGlobalContextActionBar(); } super.onCreateOptionsMenu(menu, inflater); } @Override public boolean onOptionsItemSelected(MenuItem item) { if (mDrawerToggle.onOptionsItemSelected(item)) { return true; } if (item.getItemId() == R.id.action_example) { Toast.makeText(getActivity(), "Example action.", Toast.LENGTH_SHORT).show(); return true; } return super.onOptionsItemSelected(item); } /** * Per the navigation drawer design guidelines, updates the action bar to show the global app * 'context', rather than just what's in the current screen. */ private void showGlobalContextActionBar() { ActionBar actionBar = getActionBar(); actionBar.setDisplayShowTitleEnabled(true); actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_STANDARD); actionBar.setTitle(R.string.app_name); } private ActionBar getActionBar() { return ((ActionBarActivity) getActivity()).getSupportActionBar(); } /** * Callbacks interface that all activities using this fragment must implement. */ public static interface NavigationDrawerCallbacks { /** * Called when an item in the navigation drawer is selected. */ void onNavigationDrawerItemSelected(int position); } } 

    Sarebbe meglio e più facile creare un'applicazione con il cassetto di navigazione da zero, piuttosto che utilizzare un prefabbricato?

    L'aiuto è molto apprezzato.

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  • 4 Solutions collect form web for “Come get elementi nel cassetto di navigazione per modificare la visualizzazione”

    Dovrai impostare un setOnItemClickListener sul tuo drawerLayout (l'id della listview nel tuo file xml)

    Esempio:

      drawerLayout.setOnItemClickListener(new ListView.onItemClickListener){ @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { displayView(position); }} private void displayView(int position) { switch (position) { case 0: fragment = new FirstFragment(); break; case 1: fragment = new SecondFragment(); break; if (fragment != null) { FragmentManager fragmentManager = getFragmentManager(); fragmentManager.beginTransaction() .replace(R.id.frame_layout_id, fragment).commit(); // 

    E hai bisogno di creare una class java separata per il FirstFragment e il SecondFragment con qualsiasi contenuto necessario.

    Beh, lo lascio qui se qualcuno ha bisogno di aiuto per passare frammenti in un progetto di drawer di "Android Studio"

    La risposta proposta da user2511882, utilizza quanto segue:

     fragment = new FirstFragment(); 

    Ma il codice generato da "Android Studio" utilizza:

     fragment = FirstFragment.newInstance(); 

    (che è una pratica migliore, vedi perché QUI )

    Ecco perché la sua risposta non funziona per il tuo progetto.

    Nel tuo caso, devi usare qualcosa di simile:

      @Override public void onNavigationDrawerItemSelected(int position) { Fragment fragment = null; switch (position){ case 0: fragment = FirstFragment.newInstance(position + 1); break; case 1: fragment = SecondFragment.newInstance(position + 1); break; } FragmentManager fragmentManager = getSupportFragmentManager(); fragmentManager.beginTransaction() .replace(R.id.container, fragment) .commit(); } 

    In "Android Studio" è anche una buona pratica per leggere i commenti e "TODOS" incorporati nel codice generato automaticamente.

    i migliori saluti.

    get la posizione dell'articolo in visualizzazione di navigazione è ansible impostare il primo menu di posizione di posizione 0 per default

    navigationView.getMenu () getItem (0).; // menu predefinito selezionato

     displayview(navigationView.getMenu().getItem(0)); private void setupDrawerContent(final NavigationView navigationView) { navigationView.setNavigationItemSelectedListener( new NavigationView.OnNavigationItemSelectedListener() { @Override public boolean onNavigationItemSelected(MenuItem menuItem) { displayView(menuItem); return true; } }); } public void displayView(MenuItem menuItem) { Fragment fragment = null; switch (menuItem.getItemId()) { case R.id.nav_home: // fragment = new CheeseListFragment(); break; case R.id.nav_messages: fragment = new MessageFragment(); break; } if(fragment != null) { getSupportFragmentManager().beginTransaction() .add(R.id.container, fragment) .commit(); menuItem.setChecked(true); mDrawerLayout.closeDrawers(); } } 

    get la posizione dell'articolo in visualizzazione di navigazione è ansible impostare il primo menu di posizione di posizione 0 per default

     navigationView.getMenu().getItem(0); // default selected menu 
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