我开发了一个带导航抽屉的应用程序。每当应用程序第一次启动时，它都会打开导航抽屉。
有什么方法可以将它设置为关闭？以下是自动生成的代码供您理解。
import com.example.navigationdrawer.R;
import android.support.v7.app.ActionBarActivity; import android.app.Activity; import android.support.v7.app.ActionBar; import android.support.v4.app.Fragment; import android.support.v4.app.ActionBarDrawerToggle; import android.support.v4.view.GravityCompat; import android.support.v4.widget.DrawerLayout; import android.content.SharedPreferences; import android.content.res.Configuration; import android.os.Bundle; import android.preference.PreferenceManager; import android.view.LayoutInflater; import android.view.Menu; import android.view.MenuInflater; import android.view.MenuItem; import android.view.View; import android.view.ViewGroup; import android.widget.AdapterView; import android.widget.ArrayAdapter; import android.widget.ListView; import android.widget.Toast;
/** * Fragment used for managing interactions for and presentation of a navigation * drawer. See the <a href= * "https://developer.android.com/design/patterns/navigation-drawer.html#Interaction"
* > design guidelines</a> for a complete explanation of the behaviors * implemented here. */ public class NavigationDrawerFragment extends Fragment {
/** * Remember the position of the selected item. */ private static final String STATE_SELECTED_POSITION = "selected_navigation_drawer_position";
/** * Per the design guidelines, you should show the drawer on launch until the * user manually expands it. This shared preference tracks this. */ private static final String PREF_USER_LEARNED_DRAWER = "navigation_drawer_learned";
/** * A pointer to the current callbacks instance (the Activity).
*/ private NavigationDrawerCallbacks mCallbacks;
/** * Helper component that ties the action bar to the navigation drawer. */ private ActionBarDrawerToggle mDrawerToggle;
private DrawerLayout mDrawerLayout; private ListView mDrawerListView; private View mFragmentContainerView;
private int mCurrentSelectedPosition = 0; private boolean mFromSavedInstanceState; private boolean mUserLearnedDrawer;
public NavigationDrawerFragment() { }
@Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState);
// Read in the flag indicating whether or not the user has demonstrated // awareness of the // drawer. See PREF_USER_LEARNED_DRAWER for details. SharedPreferences sp = PreferenceManager
.getDefaultSharedPreferences(getActivity()); mUserLearnedDrawer = sp.getBoolean(PREF_USER_LEARNED_DRAWER, false);
if (savedInstanceState != null) { mCurrentSelectedPosition = savedInstanceState
.getInt(STATE_SELECTED_POSITION); mFromSavedInstanceState = true; }
// Select either the default item (0) or the last selected item. selectItem(mCurrentSelectedPosition);
}
@Override public void onActivityCreated(Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); // Indicate that this fragment would like to influence the set of // actions in the action bar. setHasOptionsMenu(true); }
@Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { mDrawerListView
= (ListView) inflater.inflate(
R.layout.fragment_navigation_drawer, container, false);
mDrawerListView
.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
selectItem(position);
}
}); mDrawerListView.setAdapter(new ArrayAdapter<String>(getActionBar()
.getThemedContext(), android.R.layout.simple_list_item_1,
android.R.id.text1, new String[] {
getString(R.string.title_section1),
getString(R.string.title_section2),
getString(R.string.title_section3),
})); mDrawerListView.setItemChecked(mCurrentSelectedPosition, true);
return mDrawerListView; }
public boolean isDrawerOpen() { return mDrawerLayout != null
&& mDrawerLayout.isDrawerOpen(mFragmentContainerView); }
/** * 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, DrawerLayout drawerLayout) { mFragmentContainerView = getActivity().findViewById(fragmentId); mDrawerLayout = 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.custom_ic_drawer, /* nav drawer image to replace 'Up' caret */ R.string.navigation_drawer_open, /*
* "open drawer" description for
* accessibility
*/ R.string.navigation_drawer_close /*
* "close drawer" description for
* accessibility
*/ ) { @Override public void onDrawerClosed(View drawerView) {
super.onDrawerClosed(drawerView);
if (!isAdded()) {
return;
}
getActivity().supportInvalidateOptionsMenu(); // calls
// onPrepareOptionsMenu() }
@Override public void onDrawerOpened(View drawerView) {
super.onDrawerOpened(drawerView);
if (!isAdded()) {
return;
}
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)
.commit();
}
getActivity().supportInvalidateOptionsMenu(); // calls
// onPrepareOptionsMenu() } };
// 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); }
private void selectItem(int position) { mCurrentSelectedPosition = position; if (mDrawerListView != null) { mDrawerListView.setItemChecked(position, true); } if (mDrawerLayout != null) { mDrawerLayout.closeDrawer(mFragmentContainerView); } if (mCallbacks != null) { mCallbacks.onNavigationDrawerItemSelected(position); } }
@Override public void onAttach(Activity activity) { super.onAttach(activity); try { mCallbacks = (NavigationDrawerCallbacks) activity; } catch (ClassCastException e) { throw new ClassCastException(
"Activity must implement NavigationDrawerCallbacks."); } }
@Override public void onDetach() { super.onDetach(); mCallbacks
= null; }
@Override public void onSaveInstanceState(Bundle outState) { super.onSaveInstanceState(outState); outState.putInt(STATE_SELECTED_POSITION, mCurrentSelectedPosition); }
@Override public void onConfigurationChanged(Configuration newConfig) { super.onConfigurationChanged(newConfig); // Forward the new configuration the drawer toggle component. mDrawerToggle.onConfigurationChanged(newConfig); }
@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; }
if (item.getItemId() == R.id.action_example) { Toast.makeText(getActivity(), "Example action.", Toast.LENGTH_SHORT)
.show(); return true; }
return super.onOptionsItemSelected(item); }
/** * Per the navigation drawer design guidelines, updates the action bar to * show the global app 'context', rather than just what's in the current * screen. */ private void showGlobalContextActionBar() { ActionBar actionBar = getActionBar(); actionBar.setDisplayShowTitleEnabled(true); actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_STANDARD); actionBar.setTitle(R.string.selectStr); }
private ActionBar getActionBar() { return ((ActionBarActivity) getActivity()).getSupportActionBar(); }
/** * Callbacks interface that all activities using this fragment must * implement. */ public static interface NavigationDrawerCallbacks { /** * Called when an item in the navigation drawer is selected. */ void onNavigationDrawerItemSelected(int position); } }
答案 0 :(得分：18)
有一个
mUserLearnedDrawer = sp.getBoolean(PREF_USER_LEARNED_DRAWER, false);
将该代码更改为以下其中一项
mUserLearnedDrawer = true;
或
mUserLearnedDrawer = sp.getBoolean(PREF_USER_LEARNED_DRAWER, true);
或者您可以完全删除在应用程序运行时第一次检查抽屉是否打开的逻辑以及相关代码（mUserLearnedDrawer变量等）
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)
.commit();
}