Android：轻按操作栏不会打开导航抽屉

Question

从（android studio中的默认项目）和各个站点汲取灵感，我想将导航抽屉作为布局和代码作为片段来实现。但是当时点击动作栏时打开导航抽屉的动作不起作用。 为什么默认项目有效？ 它几乎是相同的代码。 码：

public class NavigationDrawerFragment extends Fragment {
/**
 * Users of this fragment must call this method to set up the navigation drawer interactions.
 *
 * @param fragmentId   The android:id of this fragment in its activity's layout.
 * @param drawerLayout The DrawerLayout containing this fragment's UI.
 */
public void setUp(int fragmentId, View drawerLayout) {
    Log.d(TAG,"setUp started");
    if (drawerLayout instanceof DrawerLayout) {//if view smartphone
        mFragmentContainerView = getActivity().findViewById(fragmentId);
        mDrawerLayout = (DrawerLayout)drawerLayout;

        // 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
        ActionBar actionBar = getActionBar();
        actionBar.setDisplayHomeAsUpEnabled(true);
        actionBar.setHomeButtonEnabled(true);

        // ActionBarDrawerToggle ties together the the proper interactions
        // between the navigation drawer and the action bar app icon.
        mDrawerToggle = new ActionBarDrawerToggle(
                getActivity(),                    /* 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 */
        ) {
            @Override
            public void onDrawerClosed(View drawerView) {
                super.onDrawerClosed(drawerView);
                getActionBar().setTitle(getString(R.string.app_name));
            }

            @Override
            public void onDrawerOpened(View drawerView) {
                super.onDrawerOpened(drawerView);
                getActionBar().setTitle(getString(R.string.visualing_when_drawer_open));

                if (!mUserLearnedDrawer) {
                    // The user manually opened the drawer; store this flag to prevent auto-showing
                    // the navigation drawer automatically in the future.
                    mUserLearnedDrawer = true;
                    SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(getActivity());
                    sp.edit().putBoolean(PREF_USER_LEARNED_DRAWER, true).apply();
                }

            }
        };

        // If the user hasn't 'learned' about the drawer, open it to introduce them to the drawer,
        // per the navigation drawer design guidelines.
        if (!mUserLearnedDrawer && !mFromSavedInstanceState) {
            mDrawerLayout.openDrawer(mFragmentContainerView);
        }

        // Defer code dependent on restoration of previous instance state.
        mDrawerLayout.post(new Runnable() {
            @Override
            public void run() {
                mDrawerToggle.syncState();
            }
        });

        mDrawerLayout.setDrawerListener(mDrawerToggle);
    }
}

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

“主要活动”：

public class MyActivity extends Activity implements NavigationDrawerFragment.NavigationDrawerCallbacks {

private final String TAG = getClass().getSimpleName();

private boolean doubleBackToExitPressedOnce;

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

    NavigationDrawerFragment mNavigationDrawerFragment = (NavigationDrawerFragment) getFragmentManager().findFragmentById(R.id.navigation_drawer);
    mNavigationDrawerFragment.setUp(R.id.navigation_drawer, findViewById(R.id.drawer_layout));//TODO error for tablet (not DrawerLayout but Linear)
}

如果您希望所有项目都可以在此处的github页面上找到（分支开发）。

---

第一次尝试：我尝试在NavigationDrawerfragment类上设置此设置，但不起作用

@Override
    public void onActivityCreated (Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        mDrawerToggle.syncState();
}

---

第二尝试：我尝试在“ MainActivity”中设置此设置，但不起作用

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

---

Answer 1

将此添加到您的NavigationDrawerFragment中：

@Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
    // If the drawer is open, show the global app actions in the action bar. See also
    // showGlobalContextActionBar, which controls the top-left area of the action bar.
    if (mDrawerLayout != null && isDrawerOpen()) {
        inflater.inflate(R.menu.global, menu);
        showGlobalContextActionBar();
    }
    super.onCreateOptionsMenu(menu, inflater);
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    if (mDrawerToggle.onOptionsItemSelected(item)) {
        return true;
    }

    return super.onOptionsItemSelected(item);
}

然后在onDrawerOpened末尾的设置方法中：

getActivity().supportInvalidateOptionsMenu(); // calls onPrepareOptionsMenu()

您的代码中缺少此内容，请添加它，它可能会起作用