我正在尝试创建一个包含三个不同片段的活动作为菜单。
用户应该根据活动的某些数据只看到他需要的片段。
这是我的主要XML文件：
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/MainScreenLayout"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin"
tools:context="ibuy.ibuy.MainScreen">
<android.support.v4.widget.DrawerLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="ibuy.ibuy.MainScreen">
.
.
.
<fragment
android:id="@+id/navigation_drawer1"
android:layout_width="@dimen/navigation_drawer_width"
android:layout_height="match_parent"
android:layout_gravity="start"
android:name="Menus.ManagerMainMenu"
tools:layout="@layout/fragment_navigation_drawer"
android:alpha="255"/>
<fragment
android:id="@+id/navigation_drawer2"
android:layout_width="@dimen/navigation_drawer_width"
android:layout_height="match_parent"
android:layout_gravity="start"
android:name="Menus.MainConnectedMenu"
tools:layout="@layout/fragment_navigation_drawer"
android:alpha="255"/>
<fragment
android:id="@+id/navigation_drawer3"
android:layout_width="@dimen/navigation_drawer_width"
android:layout_height="match_parent"
android:layout_gravity="start"
android:name="Menus.MainDisConnectedMenu"
tools:layout="@layout/fragment_navigation_drawer"
android:alpha="255"/>
</android.support.v4.widget.DrawerLayout>
</RelativeLayout>
这是我的主要Java文件：
public class MainScreen extends ActionBarActivity implements ManagerMainMenu.NavigationDrawerCallbacks,MainConnectedMenu.NavigationDrawerCallbacks,MainDisConnectedMenu.NavigationDrawerCallbacks {
.
.
.
private ManagerMainMenu mnMenu = new ManagerMainMenu();
private MainConnectedMenu conMenu = new MainConnectedMenu();
private MainDisConnectedMenu disMenu = new MainDisConnectedMenu();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main_screen);
Bundle extras = getIntent().getExtras();
.
.
.
mnMenu = (ManagerMainMenu) getSupportFragmentManager().findFragmentById(R.id.navigation_drawer1);
mnMenu.setUp(R.id.navigation_drawer1, (DrawerLayout) findViewById(R.id.drawer_layout));
conMenu = (MainConnectedMenu) getSupportFragmentManager().findFragmentById(R.id.navigation_drawer2);
conMenu.setUp(R.id.navigation_drawer2, (DrawerLayout) findViewById(R.id.drawer_layout));
disMenu = (MainDisConnectedMenu) getSupportFragmentManager().findFragmentById(R.id.navigation_drawer3);
disMenu.setUp(R.id.navigation_drawer3, (DrawerLayout) findViewById(R.id.drawer_layout));
android.support.v4.app.FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
if (storeID > 0) {
ft.show(mnMenu);
ft.hide(conMenu);
ft.hide(disMenu);
} else if (userID > 0) {
ft.hide(mnMenu);
ft.show(conMenu);
ft.hide(disMenu);
} else {
ft.hide(mnMenu);
ft.hide(conMenu);
ft.show(disMenu);
}
ft.commit();
}
public void onNavigationDrawerItemSelected(int position) {
FragmentManager fragmentManager = getSupportFragmentManager();
fragmentManager.beginTransaction().replace(R.id.MainScreenLayout, new PlaceholderFragment()).commit();
.
.
.
}
.
.
.
}
这三个片段与其项目列表数组相同。
这是片段Java文件中的一个：
public class ManagerMainMenu extends Fragment {
private static final String STATE_SELECTED_POSITION = "selected_navigation_drawer_position";
private static final String PREF_USER_LEARNED_DRAWER = "navigation_drawer_learned";
private NavigationDrawerCallbacks mCallbacks;
private ActionBarDrawerToggle mDrawerToggle;
private DrawerLayout mDrawerLayout;
private ListView mDrawerListView;
private View mFragmentContainerView;
private int mCurrentSelectedPosition = 0;
private boolean mFromSavedInstanceState;
private boolean mUserLearnedDrawer;
public ManagerMainMenu() { }
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(getActivity());
mUserLearnedDrawer = sp.getBoolean(PREF_USER_LEARNED_DRAWER, false);
if (savedInstanceState != null) {
mCurrentSelectedPosition = savedInstanceState.getInt(STATE_SELECTED_POSITION);
mFromSavedInstanceState = true;
}
selectItem(mCurrentSelectedPosition);
}
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
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_activated_1,
android.R.id.text1,
new String[]{"Store Rank", "Store Details", "Sales", "Add Item",
"Update Store Details", "Personal Details", "LogOut"}));
mDrawerListView.setItemChecked(mCurrentSelectedPosition, true);
return mDrawerListView;
}
public boolean isDrawerOpen() {
return mDrawerLayout != null && mDrawerLayout.isDrawerOpen(mFragmentContainerView);
}
public void setUp(int fragmentId, DrawerLayout drawerLayout) {
mFragmentContainerView = getActivity().findViewById(fragmentId);
mDrawerLayout = drawerLayout;
mDrawerLayout.setDrawerShadow(R.drawable.drawer_shadow, GravityCompat.START);
ActionBar actionBar = getActionBar();
actionBar.setDisplayHomeAsUpEnabled(true);
actionBar.setHomeButtonEnabled(true);
mDrawerToggle = new ActionBarDrawerToggle(
getActivity(), /* host Activity */
mDrawerLayout, /* DrawerLayout object */
R.drawable.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) {
mUserLearnedDrawer = true;
SharedPreferences sp = PreferenceManager
.getDefaultSharedPreferences(getActivity());
sp.edit().putBoolean(PREF_USER_LEARNED_DRAWER, true).apply();
}
getActivity().supportInvalidateOptionsMenu(); // calls onPrepareOptionsMenu()
}
};
if (!mUserLearnedDrawer && !mFromSavedInstanceState) {
mDrawerLayout.openDrawer(mFragmentContainerView);
}
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);
}
private ActionBar getActionBar() {
return ((ActionBarActivity) getActivity()).getSupportActionBar();
}
public static interface NavigationDrawerCallbacks {
void onNavigationDrawerItemSelected(int position);
}
}
我尝试使用setMenuVisibility（）和setUserVisibleHint（），但它没有任何影响力。之后我尝试将FragmentTransaction与show和hide一起使用，它也没有做任何事情。
如何隐藏其中两个片段并显示第三个片段？
提前谢谢你！
答案 0 :(得分：0)
我认为这可以解决您的问题。
FragmentTransaction ft = getFragmentManager().beginTransaction();
if (storeID > 0) {
ft.show(mnMenu);
ft.hide(conMenu);
ft.hide(disMenu);
} else if (userID > 0) {
...
}
等等..