Pulsante di commutazione nel cassetto di navigazione

Question

Sto cercando di implementare un pulsante di attivazione nel progetto del cassetto di navigazione, che Android Studio può generare automaticamente. Alla fine voglio avere qualcosa di simile ("Scaricato" -Button):

Purtroppo non capisco come aggiungere un pulsante di commutazione per il ListView della NavDrawer. Potrei probabilmente utilizzare uno dei "Custom NavDrawer Libs", ma vorrei capire il modo in cui Google lo propone con l'esempio generato automaticamente.

Qualche idea su come implementarlo nel progetto predefinito NavDrawer?

Answer 1

Vorrei fare qualcosa del genere: invece di usare un listview userei un RecyclerView. Quindi creo tre diverse definizioni di layout per l'etichetta con l'icona, il divisore e l'etichetta con l'interruttore opzionale. La tua scheda RecyclerView dovrebbe estendere Form RecyclerView.Adapter. Per ciascuno di questi tre layout è necessario creare una propria implementazione di ViewHolder. Ora devi creare diverse classi per gli elementi dell'elenco e una superclasse per tutti loro. Nell'adapter devi sostituire il metodo getViewType. Domani quando sono al lavoro potrei postare qualche codice demo per te.

Edit:

activity_main.xml

<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android" 
xmlns:app="http://schemas.android.com/apk/res-auto" 
xmlns:tools="http://schemas.android.com/tools" 
android:id="@+id/drawer_layout" 
android:layout_width="match_parent" 
android:layout_height="match_parent"> 

<LinearLayout 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:orientation="vertical" 
    tools:context="de.devhew.navigationdrawerexample.MainActivity"> 

    <android.support.v7.widget.Toolbar xmlns:android="http://schemas.android.com/apk/res/android" 
     xmlns:app="http://schemas.android.com/apk/res-auto" 
     android:id="@+id/toolbar_main" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:background="?attr/colorPrimary" 
     android:minHeight="?attr/actionBarSize" 
     app:popupTheme="@style/AppTheme.Toolbar.Overflow" 
     app:theme="@style/AppTheme.Toolbar" /> 

    <FrameLayout 
     android:id="@+id/main_content_frame" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" /> 
</LinearLayout> 

<fragment 
    android:id="@+id/fragment_navigation_drawer" 
    android:name="de.devhew.navigationdrawerexample.drawer.NavigationDrawerFragment" 
    android:layout_width="280dp" 
    android:layout_height="match_parent" 
    android:layout_gravity="start" 
    app:layout="@layout/fragment_navigation_drawer" 
    tools:layout="@layout/fragment_navigation_drawer" /> 

MainActivity.java

public class MainActivity extends ActionBarActivity { 

private Toolbar toolbar; 

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

    toolbar = (Toolbar) findViewById(R.id.toolbar_main); 
    setSupportActionBar(toolbar); 
    getSupportActionBar().setDisplayHomeAsUpEnabled(true); 

    List<NavDrawerEntry> drawerEntries = new ArrayList<>(); 
    drawerEntries.add(new NavDrawerItemWithIcon("Home", R.drawable.app_generic)); 
    drawerEntries.add(new NavDrawerItemWithIcon("People", R.drawable.app_generic)); 
    drawerEntries.add(new NavDrawerItemWithIcon("Stuff", R.drawable.app_generic)); 
    drawerEntries.add(new NavDrawerDivider()); 
    drawerEntries.add(new NavDrawerItem("Settings")); 
    drawerEntries.add(new NavDrawerToggle("Wifi only")); 

    NavigationDrawerFragment drawerFragment = (NavigationDrawerFragment) getSupportFragmentManager().findFragmentById(R.id.fragment_navigation_drawer); 
    drawerFragment.init((android.support.v4.widget.DrawerLayout) findViewById(R.id.drawer_layout), 
      toolbar, drawerEntries); 
}} 

NavigationDrawerFragment.java

public class NavigationDrawerFragment extends Fragment { 

private View root; 
private ActionBarDrawerToggle mDrawerToggle; 
private DrawerLayout mDrawerLayout; 
private RecyclerView mRecyclerView; 

@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { 
    root = inflater.inflate(R.layout.fragment_navigation_drawer, container, false); 
    return root; 
} 

public void init(DrawerLayout drawerLayout, final Toolbar toolbar, List<NavDrawerEntry> drawerEntries) { 
    mDrawerLayout = drawerLayout; 
    mDrawerToggle = new ActionBarDrawerToggle(getActivity(), 
      drawerLayout, toolbar, R.string.drawer_open, R.string.drawer_close) { 
     @Override 
     public void onDrawerOpened(View drawerView) { 
      super.onDrawerOpened(drawerView); 
      getActivity().invalidateOptionsMenu(); 
     } 

     @Override 
     public void onDrawerClosed(View drawerView) { 
      super.onDrawerClosed(drawerView); 
      getActivity().invalidateOptionsMenu(); 
     } 
    }; 

    mDrawerLayout.setDrawerListener(mDrawerToggle); 
    mDrawerLayout.post(new Runnable() { 
     @Override 
     public void run() { 
      mDrawerToggle.syncState(); 
     } 
    }); 

    mRecyclerView = (RecyclerView) root.findViewById(R.id.nav_list); 
    mRecyclerView.setLayoutManager(new LinearLayoutManager(getActivity())); 
    mRecyclerView.setHasFixedSize(true); 

    NavigationDrawerAdapter adapter = new NavigationDrawerAdapter(getActivity(), drawerEntries); 
    mRecyclerView.setAdapter(adapter); 
}} 

NavigationDrawerAdapter.java

public class NavigationDrawerAdapter 
    extends RecyclerView.Adapter<RecyclerView.ViewHolder> { 

private List<NavDrawerEntry> data; 
private LayoutInflater inflater; 

public NavigationDrawerAdapter(Context context, List<NavDrawerEntry> data) { 
    this.data = data; 
    this.inflater = LayoutInflater.from(context); 
} 

@Override 
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup viewGroup, int viewType) { 

    View itemLayoutView; 
    switch (viewType) { 
     case 0: 
      itemLayoutView = inflater.inflate(R.layout.layout_nav_drawer_item_with_icon, viewGroup, false); 
      ItemWithIconVH holder = new ItemWithIconVH(itemLayoutView); 
      return holder; 
     case 1: 
      itemLayoutView = inflater.inflate(R.layout.layout_nav_drawer_divider, viewGroup, false); 
      DividerVH dividerViewHolder = new DividerVH(itemLayoutView); 
      return dividerViewHolder; 
     case 2: 
      itemLayoutView = inflater.inflate(R.layout.layout_nav_drawer_item, viewGroup, false); 
      ItemVH itemViewHolder = new ItemVH(itemLayoutView); 
      return itemViewHolder; 
     case 3: 
      itemLayoutView = inflater.inflate(R.layout.layout_nav_drawer_toggle, viewGroup, false); 
      ToggleVH toggleViewHolder = new ToggleVH(itemLayoutView); 
      return toggleViewHolder; 
    } 
    return null; 
} 

@Override 
public void onBindViewHolder(RecyclerView.ViewHolder holder, final int position) { 
    final NavDrawerEntry item = data.get(position); 

    if (item instanceof NavDrawerItemWithIcon) { 
     ItemWithIconVH viewHolder = (ItemWithIconVH) holder; 
     viewHolder.mTitle.setText(((NavDrawerItemWithIcon) item).getTitle()); 
     viewHolder.mImageView.setImageResource(((NavDrawerItemWithIcon) item).getIconId()); 
    } 

    if (item instanceof NavDrawerItem) { 
     ItemVH viewHolder = (ItemVH) holder; 
     viewHolder.mTitle.setText(((NavDrawerItem) item).getTitle()); 
    } 

    if (item instanceof NavDrawerToggle) { 
     ToggleVH viewHolder = (ToggleVH) holder; 
     viewHolder.mTitle.setText(((NavDrawerToggle) item).getTitle()); 
     viewHolder.mSwitch.setChecked(((NavDrawerToggle) item).isChecked()); 
    } 
} 

@Override 
public int getItemViewType(int position) { 
    if (data.get(position) instanceof NavDrawerItemWithIcon) 
     return 0; 

    if (data.get(position) instanceof NavDrawerDivider) 
     return 1; 

    if (data.get(position) instanceof NavDrawerItem) 
     return 2; 

    if (data.get(position) instanceof NavDrawerToggle) 
     return 3; 

    return -1; 
} 

@Override 
public int getItemCount() { 
    return data.size(); 
} 

class ItemWithIconVH extends RecyclerView.ViewHolder { 
    final TextView mTitle; 
    final ImageView mImageView; 

    public ItemWithIconVH(View itemView) { 
     super(itemView); 
     mTitle = (TextView) itemView.findViewById(R.id.nav_item_title); 
     mImageView = (ImageView) itemView.findViewById(R.id.nav_item_image); 
    } 
} 

class DividerVH extends RecyclerView.ViewHolder { 
    public DividerVH(View itemView) { 
     super(itemView); 
    } 
} 

class ItemVH extends RecyclerView.ViewHolder { 
    final TextView mTitle; 

    public ItemVH(View itemView) { 
     super(itemView); 
     mTitle = (TextView) itemView.findViewById(R.id.nav_item_title); 
    } 
} 

class ToggleVH extends RecyclerView.ViewHolder { 
    final TextView mTitle; 
    final Switch mSwitch; 

    public ToggleVH(View itemView) { 
     super(itemView); 
     mTitle = (TextView) itemView.findViewById(R.id.nav_item_title); 
     mSwitch = (Switch) itemView.findViewById(R.id.nav_switch); 
    } 
}} 

superclasse di tutti gli elementi NavDrawer:

public class NavDrawerEntry {} 

Articolo senza icona:

public class NavDrawerItem extends NavDrawerEntry { 
private String title; 

public NavDrawerItem(String title) { 
    this.setTitle(title); 
} 

public String getTitle() { 
    return title; 
} 

private void setTitle(String title) { 
    this.title = title; 
}} 

dell'oggetto con l'icona:

public class NavDrawerItemWithIcon extends NavDrawerEntry { 
private String title; 
private int iconId; 

public NavDrawerItemWithIcon(String title, int iconId) { 
    this.setTitle(title); 
    this.setIconId(iconId); 
} 

public int getIconId() { 
    return iconId; 
} 

private void setIconId(int iconId) { 
    this.iconId = iconId; 
} 

public String getTitle() { 
    return title; 
} 

private void setTitle(String title) { 
    this.title = title; 
}} 

divisore:

public class NavDrawerDivider extends NavDrawerEntry {} 

Articolo con Switch:

public class NavDrawerToggle extends NavDrawerEntry { 
private String title; 
private boolean checked; 

public NavDrawerToggle(String title) { 
    this.setTitle(title); 
} 

public boolean isChecked() { 
    return checked; 
} 

public void setChecked(boolean checked) { 
    this.checked = checked; 
} 

public String getTitle() { 
    return title; 
} 

private void setTitle(String title) { 
    this.title = title; 
}} 

layout_nav_drawer_item.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
android:layout_width="match_parent" 
android:layout_height="60dp" 
android:clickable="true" 
android:orientation="horizontal"> 

<TextView 
    android:id="@+id/nav_item_title" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_centerVertical="true" 
    android:layout_gravity="center_vertical" 
    android:layout_marginLeft="16dp" 
    android:fontFamily="sans-serif" 
    android:textColor="#000" 
    android:textSize="16sp" /></LinearLayout> 

layout_nav_drawer_item_with_icon.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
android:layout_width="match_parent" 
android:layout_height="60dp" 
android:clickable="true" 
android:orientation="horizontal"> 

<ImageView 
    android:id="@+id/nav_item_image" 
    android:layout_width="30dp" 
    android:layout_height="30dp" 
    android:layout_gravity="center_vertical" 
    android:layout_marginLeft="16dp" 
    android:src="@drawable/app_generic" /> 

<TextView 
    android:id="@+id/nav_item_title" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_centerVertical="true" 
    android:layout_gravity="center_vertical" 
    android:layout_marginLeft="16dp" 
    android:fontFamily="sans-serif" 
    android:text="Verbundene Geräte" 
    android:textColor="#000" 
    android:textSize="16sp" /></LinearLayout> 

la yout_nav_drawer_divider.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
android:layout_width="match_parent" 
android:layout_height="wrap_content" 
android:orientation="vertical"> 

<View 
    android:layout_width="match_parent" 
    android:layout_height="1dp" 
    android:background="#ddd" 
    android:layout_marginBottom="8dp" 
    android:layout_marginTop="8dp" /></LinearLayout> 

layout_nav_drawer_toggle.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
android:layout_width="match_parent" 
android:layout_height="60dp" 
android:clickable="true"> 

<TextView 
    android:id="@+id/nav_item_title" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_centerVertical="true" 
    android:layout_gravity="center_vertical" 
    android:layout_marginLeft="16dp" 
    android:fontFamily="sans-serif" 
    android:text="Verbundene Geräte" 
    android:textColor="#000" 
    android:textSize="16sp" /> 

<Switch 
    android:id="@+id/nav_switch" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_alignParentRight="true" 
    android:layout_centerVertical="true" 
    android:layout_marginRight="16dp" /></RelativeLayout> 

fragment_navigation_drawer.xml

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android" 
xmlns:tools="http://schemas.android.com/tools" 
android:layout_width="280dp" 
android:layout_height="match_parent" 
android:background="#eee" 
tools:context="de.vacom.hew.materialdemo.NavigationDrawerFragment"> 

<LinearLayout 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:orientation="vertical"> 

    <LinearLayout 
     android:layout_width="match_parent" 
     android:layout_height="120dp" 
     android:background="@color/primaryColor" 
     android:elevation="3dp" 
     android:orientation="horizontal"> 

     <ImageView 
      android:id="@+id/nav_app_icon" 
      android:layout_width="40dp" 
      android:layout_height="40dp" 
      android:layout_marginLeft="16dp" 
      android:layout_marginTop="55dp" 
      android:src="@drawable/app_generic" /> 

     <TextView 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:layout_marginLeft="8dp" 
      android:layout_marginTop="64dp" 
      android:fontFamily="sans-serif-medium" 
      android:text="Demo App" 
      android:textColor="#eee" 
      android:textSize="18sp" /> 

    </LinearLayout> 

    <android.support.v7.widget.RecyclerView 
     android:id="@+id/nav_list" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" /> 

</LinearLayout></FrameLayout>