Настройка раскрывающегося списка кнопки панели действий

Question

Я хочу отобразить Drop down, которые содержат элементы из списка массивов при нажатии кнопки на панели действий.

Есть ли хорошая практика/учебник для этого?

Answer 1

я думаю, что вы можете somthink так поставить ArrayList в качестве базы данных вращателя

Spinner mySpinner = (Spinner) findViewById(R.id.my_spinner); 
//adapter helps to add data to spinner. 
ArrayAdapter<String> adapter = new ArrayAdapter<String>  (MainActivity.this,android.R.layout.simple_spinner_dropdown_item,user_spinner_string); 
mySpinner.setAdapter(adapter); 

Answer 2

SpinnerNavItem.java

public class SpinnerNavItem { 

    private String title; 
    private int icon; 

    public SpinnerNavItem(String title, int icon){ 
     this.title = title; 
     this.icon = icon; 
    } 

    public String getTitle(){ 
     return this.title;  
    } 

    public int getIcon(){ 
     return this.icon; 
    } 
} 

list_item_title_navigation.xml

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="match_parent" 
    android:layout_height="fill_parent" 
    android:padding="5dp" > 

    <ImageView android:id="@+id/imgIcon" 
     android:layout_width="25dp" 
     android:layout_height="25dp" 
     android:layout_alignParentLeft="true" 
     android:layout_alignParentTop="true" 
     android:src="@drawable/ic_launcher" 
     android:layout_marginRight="5dp" 
     /> 

    <TextView android:id="@+id/txtTitle" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_centerVertical="true" 
     android:layout_toRightOf="@id/imgIcon"/> 

</RelativeLayout> 

TitleNavigationAdapter.java

public class TitleNavigationAdapter extends BaseAdapter { 

    private ImageView imgIcon; 
    private TextView txtTitle; 
    private ArrayList<SpinnerNavItem> spinnerNavItem; 
    private Context context; 

    public TitleNavigationAdapter(Context context, 
      ArrayList<SpinnerNavItem> spinnerNavItem) { 
     this.spinnerNavItem = spinnerNavItem; 
     this.context = context; 
    } 

    @Override 
    public int getCount() { 
     return spinnerNavItem.size(); 
    } 

    @Override 
    public Object getItem(int index) { 
     return spinnerNavItem.get(index); 
    } 

    @Override 
    public long getItemId(int position) { 
     return position; 
    } 

    @Override 
    public View getView(int position, View convertView, ViewGroup parent) { 
     if (convertView == null) { 
      LayoutInflater mInflater = (LayoutInflater) 
        context.getSystemService(Activity.LAYOUT_INFLATER_SERVICE); 
      convertView = mInflater.inflate(R.layout.list_item_title_navigation, null); 
     } 

     imgIcon = (ImageView) convertView.findViewById(R.id.imgIcon); 
     txtTitle = (TextView) convertView.findViewById(R.id.txtTitle); 

     imgIcon.setImageResource(spinnerNavItem.get(position).getIcon()); 
     imgIcon.setVisibility(View.GONE); 
     txtTitle.setText(spinnerNavItem.get(position).getTitle()); 
     return convertView; 
    } 


    @Override 
    public View getDropDownView(int position, View convertView, ViewGroup parent) { 
     if (convertView == null) { 
      LayoutInflater mInflater = (LayoutInflater) 
        context.getSystemService(Activity.LAYOUT_INFLATER_SERVICE); 
      convertView = mInflater.inflate(R.layout.list_item_title_navigation, null); 
     } 

     imgIcon = (ImageView) convertView.findViewById(R.id.imgIcon); 
     txtTitle = (TextView) convertView.findViewById(R.id.txtTitle); 

     imgIcon.setImageResource(spinnerNavItem.get(position).getIcon());   
     txtTitle.setText(spinnerNavItem.get(position).getTitle()); 
     return convertView; 
    } 

} 

MainActivity.java

public class MainActivity extends Activity implements ActionBar.OnNavigationListener{ 

    // action bar 
    private ActionBar actionBar; 

    // Title navigation Spinner data 
    private ArrayList<SpinnerNavItem> navSpinner; 

    // Navigation adapter 
    private TitleNavigationAdapter adapter; 

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

     actionBar = getActionBar(); 

     // Hide the action bar title 
     actionBar.setDisplayShowTitleEnabled(false); 

     // Enabling Spinner dropdown navigation 
     actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_LIST); 

     // Spinner title navigation data 
     navSpinner = new ArrayList<SpinnerNavItem>(); 
     navSpinner.add(new SpinnerNavItem("Local", R.drawable.ic_location)); 
     navSpinner.add(new SpinnerNavItem("My Places", R.drawable.ic_my_places)); 
     navSpinner.add(new SpinnerNavItem("Checkins", R.drawable.ic_checkin)); 
     navSpinner.add(new SpinnerNavItem("Latitude", R.drawable.ic_latitude));  

     // title drop down adapter 
     adapter = new TitleNavigationAdapter(getApplicationContext(), navSpinner); 

     // assigning the spinner navigation  
     actionBar.setListNavigationCallbacks(adapter, this); 
    } 

    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
    .... 
    } 

    /** 
    * On selecting action bar icons 
    * */ 
    @Override 
    public boolean onOptionsItemSelected(MenuItem item) { 
    ... 
    } 

    /** 
    * Actionbar navigation item select listener 
    * */ 
    @Override 
    public boolean onNavigationItemSelected(int itemPosition, long itemId) { 
    // Action to be taken after selecting a spinner item 
     return false; 
    } 
}