我的应用程序中有一个NavigationDrawer，抽屉中有五个项目：
家
帐目
股票
救命
登出
现在，如果用户单击注销，它将显示两个项目：
家
登录
现在的问题是，当用户单击登录时，总是可以查看帐户视图
public class MainActivity extends FragmentActivity {
private DrawerLayout mDrawerLayout;
private ListView mDrawerList;
private ActionBarDrawerToggle mDrawerToggle;
private String abc;
private Intent ii;
// nav drawer title
private CharSequence mDrawerTitle;
// used to store app title
private CharSequence mTitle;
// slide menu items
private String[] navMenuTitles;
private TypedArray navMenuIcons;
private ArrayList<NavDrawerItem> navDrawerItems;
private NavDrawerListAdapter adapter;
SharedPreferences prefs;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
prefs = PreferenceManager.getDefaultSharedPreferences(getApplicationContext());
prefs.edit().putBoolean("locked", true).commit();
ii=getIntent();
mTitle = mDrawerTitle = getTitle();
// load slide menu items
navMenuTitles = getResources().getStringArray(R.array.nav_drawer_items);
// nav drawer icons from resources
navMenuIcons = getResources()
.obtainTypedArray(R.array.nav_drawer_icons);
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
mDrawerList = (ListView) findViewById(R.id.list_slidermenu);
navDrawerItems = new ArrayList<NavDrawerItem>();
// empty the adapter array
navDrawerItems.add(new NavDrawerItem(navMenuTitles[0], navMenuIcons.getResourceId(0, -1), 0));
navDrawerItems.add(new NavDrawerItem(navMenuTitles[5], navMenuIcons.getResourceId(5, -1), 5));
/*navDrawerItems.add(new NavDrawerItem(navMenuTitles[0], navMenuIcons.getResourceId(0, -1)));
// Find People
navDrawerItems.add(new NavDrawerItem(navMenuTitles[1], navMenuIcons.getResourceId(1, -1)));
// Photos
navDrawerItems.add(new NavDrawerItem(navMenuTitles[2], navMenuIcons.getResourceId(2, -1)));
// Communities, Will add a counter here
navDrawerItems.add(new NavDrawerItem(navMenuTitles[3], navMenuIcons.getResourceId(3, -1)));
// Pages
navDrawerItems.add(new NavDrawerItem(navMenuTitles[4], navMenuIcons.getResourceId(4, -1)));*/
// navDrawerItems.remove(new NavDrawerItem(navMenuTitles[5], navMenuIcons.getResourceId(5, -1)));
// What's hot, We will add a counter here
//navDrawerItems.add(new NavDrawerItem(navMenuTitles[5], navMenuIcons.getResourceId(5, -1)));
// Recycle the typed array
//navMenuIcons.recycle();
mDrawerList.setOnItemClickListener(new SlideMenuClickListener());
// setting the nav drawer list adapter
adapter = new NavDrawerListAdapter(getApplicationContext(),
navDrawerItems);
mDrawerList.setAdapter(adapter);
// enabling action bar app icon and behaving it as toggle button
getActionBar().setDisplayHomeAsUpEnabled(true);
getActionBar().setHomeButtonEnabled(true);
mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout,
R.drawable.ic_drawer, //nav menu toggle icon
R.string.app_name, // nav drawer open - description for accessibility
R.string.app_name // nav drawer close - description for accessibility
) {
public void onDrawerClosed(View view) {
getActionBar().setTitle(mTitle);
// calling onPrepareOptionsMenu() to show action bar icons
invalidateOptionsMenu();
}
public void onDrawerOpened(View drawerView) {
getActionBar().setTitle(mDrawerTitle);
//boolean isUserLoggedOut = getPrefBoolean("pref_is_user_logged_out",false);
//Boolean isUserLoggedOut = prefs.getBoolean("locked", false);
/*
boolean locked = true;
SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences();*/
// Check Condition and Update list as required
/*if(isUserLoggedOut){
navDrawerItems.clear();
// Home
navDrawerItems.add(new NavDrawerItem(navMenuTitles[0], navMenuIcons.getResourceId(0, -1),0)); // Login
navDrawerItems.add(new NavDrawerItem(navMenuTitles[5], navMenuIcons.getResourceId(5, -1),5));
}else{
navDrawerItems.clear();
navDrawerItems.add(new NavDrawerItem(navMenuTitles[0], navMenuIcons.getResourceId(0, -1),0));
// Find People
navDrawerItems.add(new NavDrawerItem(navMenuTitles[1], navMenuIcons.getResourceId(1, -1),1));
// Photos
navDrawerItems.add(new NavDrawerItem(navMenuTitles[2], navMenuIcons.getResourceId(2, -1),2));
// Communities, Will add a counter here
navDrawerItems.add(new NavDrawerItem(navMenuTitles[3], navMenuIcons.getResourceId(3, -1),3));
// Pages
navDrawerItems.add(new NavDrawerItem(navMenuTitles[4], navMenuIcons.getResourceId(4, -1),4));
}
adapter.notifyDataSetChanged();
*/
// calling onPrepareOptionsMenu() to hide action bar icons
invalidateOptionsMenu();
}
};
mDrawerLayout.setDrawerListener(mDrawerToggle);
if (savedInstanceState == null) {
// on first time display view for first nav item
displayView(0);
}
}
/**
* Slide menu item click listener
* */
private class SlideMenuClickListener implements
ListView.OnItemClickListener {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position,
long id) {
// display view for selected nav drawer item
// Get the item that was selected
NavDrawerItem item = navDrawerItems.get(position);
// display view for selected nav drawer item
displayView(item.thingToDo);
if(position == 4) { // position of Sign out button
navDrawerItems.clear(); // empty the adapter array
navMenuIcons.recycle();
navDrawerItems.add(new NavDrawerItem(navMenuTitles[0], navMenuIcons.getResourceId(0, -1),0));
navDrawerItems.add(new NavDrawerItem(navMenuTitles[5], navMenuIcons.getResourceId(5, -1),5));
//navDrawerItems.remove(new NavDrawerItem(navMenuTitles[1], navMenuIcons.getResourceId(1, -1)));
adapter.notifyDataSetChanged();
}
else {
if (ii.hasExtra("login")) {
abc = ii.getStringExtra("login");
if (abc == ii.getStringExtra("login")) {
navDrawerItems.clear();
navMenuIcons.recycle();
navDrawerItems.add(new NavDrawerItem(navMenuTitles[0], navMenuIcons.getResourceId(0, -1),0));
// Find People
navDrawerItems.add(new NavDrawerItem(navMenuTitles[1], navMenuIcons.getResourceId(1, -1),1));
// Photos
navDrawerItems.add(new NavDrawerItem(navMenuTitles[2], navMenuIcons.getResourceId(2, -1),2));
// Communities, Will add a counter here
navDrawerItems.add(new NavDrawerItem(navMenuTitles[3], navMenuIcons.getResourceId(3, -1),3));
// Pages
navDrawerItems.add(new NavDrawerItem(navMenuTitles[4], navMenuIcons.getResourceId(4, -1),4));
// navDrawerItems.remove(new NavDrawerItem(navMenuTitles[5], navMenuIcons.getResourceId(5, -1)));
adapter.notifyDataSetChanged();
Toast.makeText(MainActivity.this, "success" + abc, Toast.LENGTH_LONG).show();
} else {
Toast.makeText(MainActivity.this, "unsuccess" + abc, Toast.LENGTH_LONG).show();
}
}
}
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// toggle nav drawer on selecting action bar app icon/title
if (mDrawerToggle.onOptionsItemSelected(item)) {
return true;
}
// Handle action bar actions click
switch (item.getItemId()) {
case R.id.action_settings:
return true;
default:
return super.onOptionsItemSelected(item);
}
}
/* *
* Called when invalidateOptionsMenu() is triggered
*/
@Override
public boolean onPrepareOptionsMenu(Menu menu) {
// if nav drawer is opened, hide the action items
boolean drawerOpen = mDrawerLayout.isDrawerOpen(mDrawerList);
menu.findItem(R.id.action_settings).setVisible(!drawerOpen);
return super.onPrepareOptionsMenu(menu);
}
/**
* Diplaying fragment view for selected nav drawer list item
* */
private void displayView(int position) {
// update the main content by replacing fragments
Fragment fragment = null;
switch (position) {
case 0:
fragment = new HomeFragment();
break;
case 1:
fragment = new FindPeopleFragment();
break;
case 2:
fragment = new PhotosFragment();
break;
case 3:
fragment = new CommunityFragment();
break;
case 4:
fragment = new LoginActivity();
break;
case 5:
fragment = new LoginActivity();
break;
default:
break;
}
if (fragment != null) {
FragmentManager fragmentManager = getSupportFragmentManager();
fragmentManager.beginTransaction()
.replace(R.id.frame_container, fragment).commit();
// update selected item and title, then close the drawer
mDrawerList.setItemChecked(position, true);
mDrawerList.setSelection(position);
setTitle(navMenuTitles[position]);
mDrawerLayout.closeDrawer(mDrawerList);
} else {
// error in creating fragment
Log.e("MainActivity", "Error in creating fragment");
}
}
@Override
public void setTitle(CharSequence title) {
mTitle = title;
getActionBar().setTitle(mTitle);
}
@Override
protected void onPostCreate(Bundle savedInstanceState) {
super.onPostCreate(savedInstanceState);
// Sync the toggle state after onRestoreInstanceState has occurred.
mDrawerToggle.syncState();
}
@Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
// Pass any configuration change to the drawer toggls
mDrawerToggle.onConfigurationChanged(newConfig);
}
}
适配器
public class NavDrawerListAdapter extends BaseAdapter {
private Context context;
private ArrayList<NavDrawerItem> navDrawerItems;
public NavDrawerListAdapter(Context context, ArrayList<NavDrawerItem> navDrawerItems){
this.context = context;
this.navDrawerItems = navDrawerItems;
}
@Override
public int getCount() {
return navDrawerItems.size();
}
@Override
public Object getItem(int position) {
return navDrawerItems.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
if (convertView == null) {
LayoutInflater mInflater = (LayoutInflater)
context.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
convertView = mInflater.inflate(R.layout.drawer_list_item, null);
}
ImageView imgIcon = (ImageView) convertView.findViewById(R.id.icon);
TextView txtTitle = (TextView) convertView.findViewById(R.id.title);
TextView txtCount = (TextView) convertView.findViewById(R.id.counter);
imgIcon.setImageResource(navDrawerItems.get(position).getIcon());
txtTitle.setText(navDrawerItems.get(position).getTitle());
// displaying count
// check whether it set visible or not
if(navDrawerItems.get(position).getCounterVisibility()){
txtCount.setText(navDrawerItems.get(position).getCount());
}else{
// hide the counter view
txtCount.setVisibility(View.GONE);
}
return convertView;
}
}
Login_Activity
public class LoginActivity extends Fragment{
public LoginActivity(){}
private Button alreadymember;
private Button checkout;
private Button forgotpass;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
final View rootView = inflater.inflate(R.layout.login_activity, container, false);
alreadymember=(Button)rootView.findViewById(R.id.btn_login_alredymember);
forgotpass=(Button)rootView.findViewById(R.id.login_forgot_pwd);
checkout=(Button)rootView.findViewById(R.id.checkout_login);
alreadymember.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent intent=new Intent(getActivity(),MainActivity.class);
intent.putExtra("login","login");
startActivity(intent);
/* HomeFragment tf = new HomeFragment();
android.support.v4.app.FragmentManager fm = getFragmentManager();
android.support.v4.app.FragmentTransaction ft = fm.beginTransaction();
Bundle bundle = new Bundle();
bundle.putString("login", "login");
tf.setArguments(bundle);
ft.replace(R.id.frame_container, tf);
ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);
ft.addToBackStack(null);
ft.commit();*/
}
});
forgotpass.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Forgot_Password tf = new Forgot_Password();
android.support.v4.app.FragmentManager fm = getFragmentManager();
android.support.v4.app.FragmentTransaction ft = fm.beginTransaction();
ft.replace(R.id.frame_container, tf);
ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);
ft.addToBackStack(null);
ft.commit();
}
});
checkout.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
CheckoutBeforeLogin tf = new CheckoutBeforeLogin();
android.support.v4.app.FragmentManager fm = getFragmentManager();
android.support.v4.app.FragmentTransaction ft = fm.beginTransaction();
ft.replace(R.id.frame_container, tf);
ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);
ft.addToBackStack(null);
ft.commit();
}
});
return rootView;
}
}
最佳答案
您始终以displayView()列表中选定的索引位置调用NavDrawerItems。在用户注销的情况下，列表中只有2个项目。当用户选择“登录”时，索引位置是1，而不是5。
您可能想向NavDrawerItem添加另一个变量，该变量代表用户选择该项目时要显示的Fragment。您可以使用int值，然后将其传递给displayView()，也可以使用Fragment的类名进行显示。
编辑：添加示例代码
在NavDrawerItem中，您应具有以下内容：
String title;
Icon icon;
添加以下内容：
int thingToDo;
然后，在
NavDrawerItem的构造函数中，向构造函数添加int参数以初始化字段，如下所示：public NavDrawerItem(String title, Icon icon, int thingToDo) {
this.title = title;
this.icon = icon;
this.thingToDo = thingToDo;
}
将所有创建新的
NavDrawerItem实例的调用更改为包括“要做的事情”，如下所示： navDrawerItems.add(new NavDrawerItem(navMenuTitles[0], navMenuIcons.getResourceId(0, -1), 0));
navDrawerItems.add(new NavDrawerItem(navMenuTitles[5], navMenuIcons.getResourceId(5, -1), 5));
然后，在
SlideMenuClickListener.onItemClick()方法中，执行以下操作：public void onItemClick(AdapterView<?> parent, View view, int position,
long id) {
// Get the item that was selected
NavDrawerItem item = navDrawerItems.get(position);
// display view for selected nav drawer item
displayView(item.thingToDo);
}