在導航抽屜中禁用項目

Question

在我的導航抽屜中我遇到了一個問題，當它在第一個位置加載任何內容會導致應用程序崩潰，所以我的解決方案是將其設置爲更改爲「（appname）免費「或」（appname）高級版「，具體取決於是否購買了高級升級。

我想這是不可點擊的，因爲它目前能夠點擊但沒有任何反應。理想情況下，這將是一個子菜單或標題，但我無法弄清楚如何實現它。這裏是我的代碼摘錄：

public class myClass extends SherlockActivity implements 
    OnItemSelectedListener { 

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

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


@SuppressLint("NewApi") 
@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.mylayout); 

    mTitle = mDrawerTitle = getTitle(); 

    if (mIsPremium == true) { 
     mPlanetTitles = getResources().getStringArray(
       R.array.planets_array_prem); 
    } else { 
     mPlanetTitles = getResources() 
       .getStringArray(R.array.planets_array); 
    } 

    mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout); 
    mDrawerList = (ListView) findViewById(R.id.left_drawer); 

    // 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 
    mDrawerList.setAdapter(new ArrayAdapter<String>(this, 
      R.layout.drawer_list_item, mPlanetTitles)); 
    mDrawerList.setOnItemClickListener(new DrawerItemClickListener()); 

    // enable ActionBar app icon to behave as action to toggle nav drawer 
    getSupportActionBar().setDisplayHomeAsUpEnabled(true); 
    getSupportActionBar().setHomeButtonEnabled(true); 

    // ActionBarDrawerToggle ties together the the proper interactions 
    // between the sliding drawer and the action bar app icon 
    mDrawerToggle = new ActionBarDrawerToggle(this, /* host Activity */ 
    mDrawerLayout, /* DrawerLayout object */ 
    R.drawable.ic_drawer, /* nav drawer image to replace 'Up' caret */ 
    R.string.drawer_open, /* "open drawer" description for accessibility */ 
    R.string.drawer_close /* "close drawer" description for accessibility */ 
    ) { 
     public void onDrawerClosed(View view) { 
      getSupportActionBar().setTitle(mTitle); 
      supportInvalidateOptionsMenu(); // creates call to 
              // onPrepareOptionsMenu() 
     } 

     public void onDrawerOpened(View drawerView) { 
      getSupportActionBar().setTitle(mDrawerTitle); 
      supportInvalidateOptionsMenu(); // creates call to 
              // onPrepareOptionsMenu() 
     } 
    }; 
    mDrawerLayout.setDrawerListener(mDrawerToggle); 

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

} 

/* The click listener for ListView in the navigation drawer */ 
private class DrawerItemClickListener implements 
     ListView.OnItemClickListener { 

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

     switch (position) { 
     case 0: 
      /* 
      * Toast.makeText(getApplicationContext(), 
      * "case 0 - A Activity.", Toast.LENGTH_LONG).show(); Intent 
      * c0 = new Intent(getBaseContext(), 
      * activity.class); startActivity(c0); 
      */break; 
     case 1: 
      Toast.makeText(getApplicationContext(), 
        "case 1 - B Activity", Toast.LENGTH_LONG).show(); 
      Intent c1 = new Intent(getBaseContext(), 
        ActivityB.class); 
      startActivity(c1); 
      break; 
     default: 
     } 
    } 
} 

public void selectItem(int position) { 
    switch (position) { 
    case 0: 
     // setContentView(R.layout.main); 
     break; 
    case 1: 
     setContentView(R.layout.main); 
     break; 
    default: 
    } 
} 

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

/** 
* When using the ActionBarDrawerToggle, you must call it during 
* onPostCreate() and onConfigurationChanged()... 
*/ 

@Override 
protected void onPostCreate(Bundle savedInstanceState) { 
    super.onPostCreate(savedInstanceState); 
    // Sync the toggle state after onRestoreInstanceState has occurred. 
    mDrawerToggle.syncState(); 
} 

@Override 
public void onConfigurationChanged(Configuration newConfig) { 
    super.onConfigurationChanged(newConfig); 
    // Pass any configuration change to the drawer toggls 
    mDrawerToggle.onConfigurationChanged(newConfig); 
} 

我不使用的片段，我會做的點擊和移動到新的活動來實現導航的抽屜裏。我正在尋找解決我的主要問題，但會歡迎任何設計技巧。

謝謝

編輯

隨着CommonsWare的幫助下，我開發了這個：但沒有什麼是我的應用程序不同。我想第一次（情況0（位置0））被禁用。

public class MyArrayAdapter extends ArrayAdapter<String> { 

    public MyArrayAdapter(Context context, int position) { 
     super(context, 0); 
    } 

    public boolean areAllItemsEnabled() { 
     return false; 
    } 

    public boolean isEnabled(int position) { 
     if (position == 0) { 
      return false; 
     } else { 
      return true; 
     } 
    } 

} 

Answer 1

正如你已經知道，因爲你已經read the answer，你需要用自定義Adapter更換您new ArrayAdapter<String>(this, R.layout.drawer_list_item, mPlanetTitles) - 延長ArrayAdapter<String>也許是一個 - 在這裏你重寫areAllItemsEnabled()回到false和isEnabled()返回true或false作爲需要。

參見：

• android - disable listview item click and reenable it

• Android ListView child View setEnabled() and setClickable() do nothing