Android 如何锁定导航抽屉?
在我的应用程序中,我使用的是导航抽屉,它工作正常,但我试图做的是,当互联网不可用时,用户应该无法打开导航抽屉,有人能帮我解决这个问题吗,导航抽屉的代码如下Android 如何锁定导航抽屉?,android,navigation-drawer,Android,Navigation Drawer,在我的应用程序中,我使用的是导航抽屉,它工作正常,但我试图做的是,当互联网不可用时,用户应该无法打开导航抽屉,有人能帮我解决这个问题吗,导航抽屉的代码如下 public class MainActivity extends Activity { private DrawerLayout mDrawerLayout; private ListView mDrawerList; private ActionBarDrawerToggle mDrawerToggle; AlertDialo
public class MainActivity extends Activity {
private DrawerLayout mDrawerLayout;
private ListView mDrawerList;
private ActionBarDrawerToggle mDrawerToggle;
AlertDialogManager alert = new AlertDialogManager();
SessionManager session;
private CharSequence mDrawerTitle;
private CharSequence mTitle;
private String[] navMenuTitles;
private TypedArray navMenuIcons;
private ArrayList<NavDrawerItem> navDrawerItems;
private NavDrawerListAdapter adapter;
private String id;
private boolean b;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
session = new SessionManager(getApplicationContext());
id = getIntent().getStringExtra("id");
System.out.println("MAIN ID : " + id);
mTitle = mDrawerTitle = getTitle();
navMenuTitles = getResources().getStringArray(R.array.nav_drawer_items);
navMenuIcons = getResources()
.obtainTypedArray(R.array.nav_drawer_icons);
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
mDrawerList = (ListView) findViewById(R.id.list_slidermenu);
b = checkInternetConnection();
if(b!=true)
{
//Toast.makeText(getApplicationContext(), "No Internet Available", Toast.LENGTH_SHORT).show();
mDrawerLayout.setDrawerLockMode(DrawerLayout.LOCK_MODE_LOCKED_CLOSED, mDrawerList);
}
else
{
System.out.println("Available");
}
navDrawerItems = new ArrayList<NavDrawerItem>();
navDrawerItems.add(new NavDrawerItem(navMenuTitles[0], navMenuIcons.getResourceId(0, -1)));
navDrawerItems.add(new NavDrawerItem(navMenuTitles[1], navMenuIcons.getResourceId(1, -1)));
navDrawerItems.add(new NavDrawerItem(navMenuTitles[2], navMenuIcons.getResourceId(2, -1)));
navDrawerItems.add(new NavDrawerItem(navMenuTitles[3], navMenuIcons.getResourceId(3, -1)));
// search
navDrawerItems.add(new NavDrawerItem(navMenuTitles[4], navMenuIcons.getResourceId(4, -1)));
// help
navDrawerItems.add(new NavDrawerItem(navMenuTitles[5], navMenuIcons.getResourceId(5, -1)));
//logout
navDrawerItems.add(new NavDrawerItem(navMenuTitles[6], navMenuIcons.getResourceId(6, -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);
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);
// 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);
}
}
public boolean checkInternetConnection() {
final ConnectivityManager conMgr = (ConnectivityManager) getSystemService (Context.CONNECTIVITY_SERVICE);
if (conMgr.getActiveNetworkInfo() != null && conMgr.getActiveNetworkInfo().isAvailable() && conMgr.getActiveNetworkInfo().isConnected()) {
return true;
} else {
System.out.println("Internet Connection Not Present");
return false;
}
}
/*void Showtoast(String message) {
Toast.makeText(MainActivity.this, message, Toast.LENGTH_LONG).show();}
private Boolean exit = false;*/
@Override
public void onBackPressed() {
// TODO Auto-generated method stub
/*if (exit)
{
finish(); // finish activity
} else
{
Toast.makeText(this, "Press Back again to Exit.",
Toast.LENGTH_SHORT).show();
exit = true;
new Handler().postDelayed(new Runnable()
{
@Override
public void run()
{
exit = false;
}
}, 3 * 1000);
}*/
AlertDialog.Builder ald = new AlertDialog.Builder(MainActivity.this);
ald.setTitle("Exit");
ald.setMessage("Are you sure you want to quit.?");
ald.setPositiveButton("Ok", new DialogInterface.OnClickListener()
{
@Override
public void onClick(DialogInterface dialog, int which)
{
moveTaskToBack(true);
android.os.Process.killProcess(android.os.Process.myPid());
System.exit(1);
}
});
ald.setNegativeButton("Cancel", null);
ald.show();
}
/**
* 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
displayView(position);
}
}
@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);
}
}
@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 PagesFragment();
break;
case 5:
fragment = new WhatsHotFragment();
break;
case 6:
fragment=new Mylist();
break;
default:
break;
}
if (fragment != null) {
FragmentManager fragmentManager = getFragmentManager();
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);
}
/**
* When using the ActionBarDrawerToggle, you must call it during
* onPostCreate() and onConfigurationChanged()...
*/
@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);
}
公共类MainActivity扩展活动{
私人抽屉布局mDrawerLayout;
私有列表视图mDrawerList;
私有操作bardrawertoggle mDrawerToggle;
AlertDialogManager alert=新建AlertDialogManager();
会话管理器会话;
私有字符序列mDrawerTitle;
私有字符序列mTitle;
私有字符串[]navMenuTitles;
专用型雷达导航仪;
私人ArrayList NavWrites;
专用导航适配器;
私有字符串id;
私有布尔b;
@凌驾
创建时受保护的void(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
session=newsessionmanager(getApplicationContext());
id=getIntent().getStringExtra(“id”);
System.out.println(“主ID:+ID”);
mTitle=mDrawerTitle=getTitle();
navMenuTitles=getResources().getStringArray(R.array.nav\u抽屉\u项目);
navMenuIcons=getResources()
.obtainTypedArray(R.array.nav_drawer_图标);
mDrawerLayout=(抽屉布局)findViewById(R.id.抽屉布局);
mDrawerList=(ListView)findViewById(R.id.list\u slidermenu);
b=检查Internet连接();
如果(b!=真)
{
//Toast.makeText(getApplicationContext(),“没有可用的Internet”,Toast.LENGTH_SHORT.show();
mDrawerLayout.setDrawerLockMode(DrawerLayout.LOCK\u MODE\u LOCKED\u CLOSED,mDrawerList);
}
其他的
{
系统输出打印项次(“可用”);
}
navDrawerItems=新的ArrayList();
添加(新的NavDrawerItem(navMenuTitles[0],navMenuIcons.getResourceId(0,-1));
添加(新的NavDrawerItem(navMenuTitles[1],navMenuIcons.getResourceId(1,-1));
添加(新的NavDrawerItem(navMenuTitles[2],navMenuIcons.getResourceId(2,-1));
add(新的NavDrawerItem(navMenuTitles[3],navMenuIcons.getResourceId(3,-1));
//搜寻
add(新的NavDrawerItem(navMenuTitles[4],navMenuIcons.getResourceId(4,-1));
//帮助
add(新的NavDrawerItem(navMenuTitles[5],navMenuIcons.getResourceId(5,-1));
//注销
add(新的NavDrawerItem(navMenuTitles[6],navMenuIcons.getResourceId(6,-1));
//回收类型化数组
navMenuIcons.recycle();
setOnItemClickListener(新的SlideMenuClickListener());
//设置导航抽屉列表适配器
适配器=新的NavDroperListAdapter(getApplicationContext(),
纳维特姆斯);
mDrawerList.setAdapter(适配器);
getActionBar().setDisplayHomeAsUpEnabled(true);
getActionBar().setHomeButtonEnabled(true);
mDrawerToggle=新操作BarDrawerToggle(此,mDrawerLayout,
R.drawable.ic_抽屉,//导航菜单切换图标
R.string.app_name,//导航抽屉打开-可访问性说明
R.string.app_name//nav抽屉关闭-可访问性说明
) {
公共无效onDrawerClosed(视图){
getActionBar().setTitle(mTitle);
//调用onPrepareOptions菜单()以显示操作栏图标
无效操作菜单();
}
打开图纸上的公共空白(视图抽屉视图){
getActionBar().setTitle(mDrawerTitle);
//调用onPrepareOptions菜单()隐藏操作栏图标
无效操作菜单();
}
};
mDrawerLayout.setDrawerListener(mDrawerToggle);
如果(savedInstanceState==null){
//第一个导航项目的首次显示视图
显示视图(0);
}
}
公共布尔值checkInternetConnection(){
最终ConnectivityManager conMgr=(ConnectivityManager)getSystemService(Context.CONNECTIVITY_服务);
如果(conMgr.getActiveNetworkInfo()!=null&&conMgr.getActiveNetworkInfo().isAvailable()&&conMgr.getActiveNetworkInfo().isConnected()){
返回true;
}否则{
System.out.println(“不存在互联网连接”);
返回false;
}
}
/*void showtoos(字符串消息){
Toast.makeText(MainActivity.this,message,Toast.LENGTH_LONG.show();}
私有布尔退出=false*/
@凌驾
public void onBackPressed(){
//TODO自动生成的方法存根
/*如果(退出)
{
finish();//完成活动
}否则
{
Toast.makeText(此选项为“再次按Back退出”,
吐司。长度(短)。show();
退出=真;
new Handler().postDelayed(new Runnable())
{
@凌驾
公开募捐
{
退出=假;
}
}, 3 * 1000);
}*/
AlertDialog.Builder ald=新建AlertDialog.Builder(MainActivity.this);
ald.设置标题(“退出”);
setMessage(“您确定要退出吗?”);
ald.setPositiveButton(“Ok”,新的DialogInterface.OnClickListener()
{
@凌驾
public void onClick(DialogInterface dialog,int which)
{
moveTaskToBack(真);
android.os.Process.killProcess(android.os.Process.myPid());
系统出口(1);
}
});
ald.setNegativeButton(“取消”,空);
ald.show();
}
/**
*幻灯片菜单项单击“侦听器”
* */
私有类SlideMenuClickListener实现
ListView.com侦听器{
@凌驾
public void onItemClick(AdapterView父视图、视图、整型位置、,
长id){
//所选导航抽屉项目的显示视图
显示视图(位置);
}
}
@凌驾
公共布尔onCreateOptions菜单(菜单){
getMenuInflater().充气(R.menu.main,menu);
返回true;
}
@凌驾
公共布尔值onOptionsItemSelected(菜单项项){
//托格
if (item.getItemId() == android.R.id.home) {
// check for internet connection in this place
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// toggle nav drawer on selecting action bar app icon/title
if (mDrawerToggle.onOptionsItemSelected(item)) {
b = checkInternetConnection();
if(b==true)
return true;
}
// Handle action bar actions click
switch (item.getItemId()) {
case R.id.action_settings:
return true;
default:
return super.onOptionsItemSelected(item);
}
}
@Override
public void onBackStackChanged() {
if(FragUtils.getCurrentFragment(this,mBinding.layoutContent.getId()) instanceof DashboardFragment) {
//show hamburger
mDrawerToggle.setDrawerIndicatorEnabled(true);
getSupportActionBar().setDisplayHomeAsUpEnabled(false);
mDrawerToggle.syncState();
mBinding.drawerLayout.setDrawerLockMode(DrawerLayout.LOCK_MODE_UNLOCKED);
mBinding.drawerLayout.closeDrawers();
mBinding.toolbar.setNavigationOnClickListener(v ->mBinding.drawerLayout.openDrawer(GravityCompat.START));
refreshBtn.setVisible(true);
}
else{
mDrawerToggle.setDrawerIndicatorEnabled(false);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);// show back button
mBinding.drawerLayout.setDrawerLockMode(DrawerLayout.LOCK_MODE_LOCKED_CLOSED);
mBinding.toolbar.setNavigationOnClickListener(v -> onBackPressed());
refreshBtn.setVisible(false);
}
}