材料设计抽屉

Question

我遇到了一个小问题。

如何使抽屉在我们启动应用程序时已经打开(类似于静态菜单，但可以在我们按下箭头按钮时将其关闭)？我们有这个菜单：

https://github.com/kanytu/android-material-drawer-template

以及示例现在的样子：

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Answer 1

   protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    mToolbar = (Toolbar) findViewById(R.id.toolbar_actionbar);
    setSupportActionBar(mToolbar);
    getSupportActionBar().setDisplayShowHomeEnabled(true);



    mNavigationDrawerFragment = (NavigationDrawerFragment) getFragmentManager().findFragmentById(R.id.fragment_drawer);
    mNavigationDrawerFragment.setup(R.id.fragment_drawer, (DrawerLayout) findViewById(R.id.drawer), mToolbar);
}

Answer 2

好的，由于您使用的是NavigationDrawerFragment，您可能遗漏了mUserLearnedDrawer属性和相关的行为。基本上，这个想法是在第一次打开抽屉时将属性保存在SharedPreferences中，并在每次调用setup()时检查该属性，这样您就可以知道是否需要在第一次为用户打开抽屉。看一下代码here。我在这里复制setup()方法，以防链接死掉：

public void setUp(int fragmentId, DrawerLayout drawerLayout, NavigationDrawerAdapter adapter, AvatarLoader avatar,
    User user) {
    mFragmentContainerView = getActivity().findViewById(fragmentId);
    mDrawerLayout = drawerLayout;
    mDrawerLayout.setDrawerShadow(R.drawable.drawer_shadow, GravityCompat.START);

    avatar.bind(userImage, user);
    userName.setText(user.getLogin());

    String name = user.getName();
    if (name != null) {
        userRealName.setText(user.getName());
    } else {
        userRealName.setVisibility(View.GONE);
    }

    mDrawerListView.setAdapter(adapter);
    mDrawerListView.setItemChecked(mCurrentSelectedPosition, true);

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

    mDrawerToggle = new ActionBarDrawerToggle(
        getActivity(), mDrawerLayout,
        R.string.navigation_drawer_open,
        R.string.navigation_drawer_close) {
        @Override
        public void onDrawerClosed(View drawerView) {
            super.onDrawerClosed(drawerView);
            if (!isAdded()) {
                return;
            }

            getActivity().supportInvalidateOptionsMenu();
        }

        @Override
        public void onDrawerOpened(View drawerView) {
            super.onDrawerOpened(drawerView);
            if (!isAdded()) {
                return;
            }

            if (!mUserLearnedDrawer) {
                mUserLearnedDrawer = true;
                SharedPreferences sp = PreferenceManager
                    .getDefaultSharedPreferences(getActivity());
                sp.edit().putBoolean(PREF_USER_LEARNED_DRAWER, true).apply();
            }

            getActivity().supportInvalidateOptionsMenu();
        }
    };

    if (!mUserLearnedDrawer && !mFromSavedInstanceState)
        mDrawerLayout.openDrawer(mFragmentContainerView);

    mDrawerLayout.post(new Runnable() {
        @Override
        public void run() {
            mDrawerToggle.syncState();
        }
    });

    mDrawerLayout.setDrawerListener(mDrawerToggle);

}