OnItemClickListener Navigation Drawer

Question

Sto creando un'app dall'esempio di Android Developers con il Navigation Drawer. Ho creato gli articoli ma non so come posso aprire una nuova attività da ciascuno degli elementi inclusi.

Questa è la MainActivity:

public class MainActivity extends Activity { 

private DrawerLayout mDrawerLayout; 
private ListView mDrawerList; 
private ActionBarDrawerToggle mDrawerToggle; 

private CharSequence mDrawerTitle; 
private CharSequence mTitle; 
private String[] mGalaxyTitles; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 

    mTitle = mDrawerTitle = getTitle(); 
    mGalaxyTitles = getResources().getStringArray(R.array.Galaxys_array); 
    mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout); 
    mDrawerList = (ListView) findViewById(R.id.left_drawer); 


    mDrawerLayout.setDrawerShadow(R.drawable.drawer_shadow, GravityCompat.START); 
    mDrawerList.setAdapter(new ArrayAdapter<String>(this, 
      R.layout.drawer_list_item, mGalaxyTitles)); 
    mDrawerList.setOnItemClickListener(new DrawerItemClickListener()); 


    getActionBar().setDisplayHomeAsUpEnabled(true); 
    getActionBar().setHomeButtonEnabled(true); 


    mDrawerToggle = new ActionBarDrawerToggle(
      this,     
      mDrawerLayout,   
      R.drawable.ic_drawer, 
      R.string.drawer_open, 
      R.string.drawer_close 
      ) { 
     public void onDrawerClosed(View view) { 
      getActionBar().setTitle(mTitle); 
      invalidateOptionsMenu(); 
     } 

     public void onDrawerOpened(View drawerView) { 
      getActionBar().setTitle(mDrawerTitle); 
      invalidateOptionsMenu(); 
     } 
    }; 
    mDrawerLayout.setDrawerListener(mDrawerToggle); 

    if (savedInstanceState == null) { 
     selectItem(0); 
    } 
} 

@Override 
public boolean onCreateOptionsMenu(Menu menu) { 
    MenuInflater inflater = getMenuInflater(); 
    inflater.inflate(R.menu.main, menu); 
    return super.onCreateOptionsMenu(menu); 
} 


@Override 
public boolean onPrepareOptionsMenu(Menu menu) { 
    boolean drawerOpen = mDrawerLayout.isDrawerOpen(mDrawerList); 
    menu.findItem(R.id.action_websearch).setVisible(!drawerOpen); 
    return super.onPrepareOptionsMenu(menu); 
} 

@Override 
public boolean onOptionsItemSelected(MenuItem item) { 

    if (mDrawerToggle.onOptionsItemSelected(item)) { 
     return true; 
    } 

    switch(item.getItemId()) { 
    case R.id.action_websearch: 
     Intent intent = new Intent(Intent.ACTION_WEB_SEARCH); 
     intent.putExtra(SearchManager.QUERY, getActionBar().getTitle()); 

     if (intent.resolveActivity(getPackageManager()) != null) { 
      startActivity(intent); 
     } else { 
      Toast.makeText(this, R.string.app_not_available, Toast.LENGTH_LONG).show(); 
     } 
     return true; 
    default: 
     return super.onOptionsItemSelected(item); 
    } 
} 


    private class DrawerItemClickListener implements ListView.OnItemClickListener { 

    @Override 
    public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, 
      long arg3) { 
     // TODO Auto-generated method stub 

    } 

} 
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) { 

    switch(position) { 
    case 1: 
      Intent a = new Intent(MainActivity.this, Page1.class); 
      startActivity(a); 
    break; 
    case 2: 
      Intent b = new Intent(MainActivity.this, Page2.class); 
      startActivity(b); 
      break; 
    default: 
    } 
    } 

private void selectItem(int position) { 

    Fragment fragment = new GalaxyFragment(); 
    Bundle args = new Bundle(); 
    args.putInt(GalaxyFragment.ARG_Galaxy_NUMBER, position); 
    fragment.setArguments(args); 

    FragmentManager fragmentManager = getFragmentManager(); 
    fragmentManager.beginTransaction().replace(R.id.content_frame, fragment).commit(); 


    mDrawerList.setItemChecked(position, true); 
    setTitle(mGalaxyTitles[position]); 
    mDrawerLayout.closeDrawer(mDrawerList); 
} 

@Override 
public void setTitle(CharSequence title) { 
    mTitle = title; 
    getActionBar().setTitle(mTitle); 
} 



@Override 
protected void onPostCreate(Bundle savedInstanceState) { 
    super.onPostCreate(savedInstanceState); 

    mDrawerToggle.syncState(); 
} 

@Override 
public void onConfigurationChanged(Configuration newConfig) { 
    super.onConfigurationChanged(newConfig); 

    mDrawerToggle.onConfigurationChanged(newConfig); 
} 


public static class GalaxyFragment extends Fragment { 
    public static final String ARG_Galaxy_NUMBER = "Galaxy_number"; 

    public GalaxyFragment() { 

    } 

    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, 
      Bundle savedInstanceState) { 
     View rootView = inflater.inflate(R.layout.fragment_Galaxy, container, false); 
     int i = getArguments().getInt(ARG_Galaxy_NUMBER); 
     String Galaxy = getResources().getStringArray(R.array.Galaxys_array)[i]; 

     int imageId = getResources().getIdentifier(Galaxy.toLowerCase(Locale.getDefault()), 
         "drawable", getActivity().getPackageName()); 
     ((ImageView) rootView.findViewById(R.id.image)).setImageResource(imageId); 
     getActivity().setTitle(Galaxy); 
     return rootView; 
    } 
} 
} 

e un cassetto List.xml

<TextView xmlns:android="http://schemas.android.com/apk/res/android" 
    android:id="@android:id/text1" 
    android:textIsSelectable="false" 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    android:textAppearance="?android:attr/textAppearanceListItemSmall" 
    android:gravity="center_vertical" 
    android:paddingLeft="16dp" 
    android:paddingRight="16dp" 
    android:textColor="#fff" 
    android:background="?android:attr/activatedBackgroundIndicator" 
    android:minHeight="?android:attr/listPreferredItemHeightSmall"/> 

Il click sulle voci non chiamare altre attività, qual è l'errore?

Answer 1

Invece di codice:

private void selectItem(int position) { 

    Fragment fragment = new GalaxyFragment(); 
    Bundle args = new Bundle(); 
    args.putInt(GalaxyFragment.ARG_Galaxy_NUMBER, position); 
    fragment.setArguments(args); 

    FragmentManager fragmentManager = getFragmentManager(); 
    fragmentManager.beginTransaction().replace(R.id.content_frame, fragment).commit(); 


    mDrawerList.setItemChecked(position, true); 
    setTitle(mGalaxyTitles[position]); 
    mDrawerLayout.closeDrawer(mDrawerList); 
} 

di questo codice:

private void selectItem(int position) { 
    switch(position) { 
    case 1: 
      Intent a = new Intent(MainActivity.this, Activity1.class); 
      startActivity(a); 
    break; 
    case 2: 
      Intent b = new Intent(MainActivity.this, Activity2.class); 
      startActivity(b); 
      break; 
    default: 
    } 
} 

E rimuovere questa parte: (Non è necessario ry)

public void onItemClick(AdapterView<?> parent, View view, int position, long id) { 

switch(position) { 
case 1: 
     Intent a = new Intent(MainActivity.this, Page1.class); 
     startActivity(a); 
break; 
case 2: 
     Intent b = new Intent(MainActivity.this, Page2.class); 
     startActivity(b); 
     break; 
default: 
} 
} 

Answer 2

Invece di utilizzare Attività basta usare un frammento e un frammento responsabile per la transizione tra di loro

Answer 3

switch(position) { 
    case 1: 
     Intent a = new Intent(Book.this, SecondActivity.class); 
     startActivity(a); 
     break; 
    case 2: 
     Intent b = new Intent(Book.this, ThirdActivity.class); 
     startActivity(b); 
     break; 
    default: 
} 

Answer 4

Nel manifesto si scrive questo codice:

<activity 
    android:name=".firstactivity" 
    android:parentActivityName=".MainActivity"> 
    <meta-data 
     android:name="android.support.PARENT_ACTIVITY" 
     android:value=".MainActivity"/> 
</activity> 

In Principale attività:

Intent i=new Intent(MainActivity.this,firstactivity.class); 
startActivity(i);