Question

在我的应用中，我聊天，此聊天是片段（ChatFrag）。我从操作栏中的项目打开此片段。此项目设置为可见false，当BattleRoomFrag（片段）可见时，它将显示为true，因为ChatFrag仅适用于此会议室（BattleRoomFrag）。

我该怎么做？

要做到这一点，我试试这个。

custom_drawer_layout

<menu 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"
tools:context="br.com.williarts.batalhajuridica.CustomDrawerLayout" >

<item
    android:id="@+id/action_settings"
    android:orderInCategory="100"
    android:title="@string/action_settings"
    app:showAsAction="never"/>


<!--Chat Button Item -->
<item
    android:id="@+id/action_chat"
    android:icon="@drawable/batalha_icon_chat"
    android:title="Chat"
    app:showAsAction="always"
    android:visible="false"

    />

ActionBarActivity

public class CustomDrawerLayout extends ActionBarActivity implements OnItemClickListener{
    private ActionBar ab;
    private DrawerLayout dl;
    private ListView lv;
    private ActionBarDrawerToggle tg;

    private List<ItensListView> fragments;
    private CharSequence tl; //titulo principal
    private CharSequence tlf; //titulo fragment 

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_custom_drawerlayout);
        getSupportActionBar().setBackgroundDrawable(new ColorDrawable(getResources().getColor(R.color.action_bar)));
        init();

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

    private void init(){
        //actionbar
        onConfigActionBar();
        //listview
        configItensListView();
        lv = (ListView)findViewById(R.id.lv);               
        lv.setAdapter(new DrawerLayoutListViewAdapter(this, fragments));
        lv.setOnItemClickListener(this);        
        //drawerlayout
        dl = (DrawerLayout)findViewById(R.id.dl);
        //actionbardrawertoggle
        tg = new ActionBarDrawerToggle(this, dl, R.drawable.btmenu, R.string.nomeActionBar){
            public void onDrawerClosed(View view) {
                ab.setTitle(tl);                
                supportInvalidateOptionsMenu();
            }

            public void onDrawerOpened(View view) {
                ab.setTitle(tlf);
                supportInvalidateOptionsMenu();
            }
        };      
        dl.setDrawerListener(tg);

        tl = tlf = getTitle();      
    }

    /** ativa actionbar e botao home na action bar */
    private void onConfigActionBar(){
        ab = getSupportActionBar();
        ab.setDisplayHomeAsUpEnabled(true);
        ab.setHomeButtonEnabled(true);
    }




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

    /** necessario */
    @Override
    protected void onPostCreate(Bundle savedInstanceState) {
        super.onPostCreate(savedInstanceState);
        tg.syncState();
    }

    /** necessario */
     @Override
     public boolean onOptionsItemSelected(MenuItem item) {
         FragmentTransaction ft;
         Fragment frag;

         if(item.getItemId() == R.id.action_chat){
             frag = new ChatFrag();
             ft = getSupportFragmentManager().beginTransaction();
             ft.replace(R.id.fl, frag, "ChatFrag");
             ft.addToBackStack("back");
             ft.commit();
         }

         if (tg.onOptionsItemSelected(item)) {
                return true;
         }
         return super.onOptionsItemSelected(item);
     }


     /** necessario */
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.custom_drawer_layout, menu);

        return true;
    }

    /** necessario */
    @Override
    public boolean onPrepareOptionsMenu(Menu menu) {
        boolean status = dl.isDrawerOpen(lv);
        menu.findItem(R.id.action_settings).setVisible(!status);

        BattleRoomFrag brf = (BattleRoomFrag)getSupportFragmentManager().findFragmentByTag("BattleRoomFrag");
        MenuItem m = menu.getItem(R.id.action_chat);
        if(brf != null && brf.isVisible()){
            m.setVisible(true);
        }else{
            m.setVisible(false);
        }

        return super.onPrepareOptionsMenu(menu);
    }

Answer 1

试试这个：在片段构造函数中，你可以设置setHasOptionsMenu（true）;在onCreateOptionsMenus中膨胀片段菜单inflater.inflate（R.menu.chat_frag，menu）; （为chat_frag创建自定义菜单）

片段可见时显示操作栏项是真的吗？

1 个答案: