I'm trying to check if the user has logged on before/ is still logged in since he has last left the app.
Now if I start up the app for the first time it gives the force stop error.
But then when I click ok, it just continues to the login screen. (see pictures for better understanding)
to check if the user is loggedin or not i am ussing a 'if else'
MainActivity.java
public class MainActivity extends Activity {
private DrawerLayout mDrawerLayout;
private ListView mDrawerList;
private ActionBarDrawerToggle mDrawerToggle;
UserFunctions userFunctions;
// 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;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Check login status in database
userFunctions = new UserFunctions();
if(userFunctions.isUserLoggedIn(getApplicationContext())){
// user already logged in show databoard
setContentView(R.layout.activity_main);
}else{
// user is not logged in show login screen
Intent login = new Intent(getApplicationContext(), LoginActivity.class);
login.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(login);
// Closing dashboard screen
//finish();
}
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>();
// adding nav drawer items to array
// add comments like:
//navDrawerItems.add(new NavDrawerItem(navMenuTitles[3], navMenuIcons.getResourceId(3, -1), true, "Winter kaart"));
// Nieuws
navDrawerItems.add(new NavDrawerItem(navMenuTitles[0], navMenuIcons.getResourceId(0, -1)));
// Rooster
navDrawerItems.add(new NavDrawerItem(navMenuTitles[1], navMenuIcons.getResourceId(1, -1)));
// Vervanging/verval doorgeven
navDrawerItems.add(new NavDrawerItem(navMenuTitles[2], navMenuIcons.getResourceId(2, -1)));
// Kaart (horeca gelegenheden)
navDrawerItems.add(new NavDrawerItem(navMenuTitles[3], navMenuIcons.getResourceId(3, -1)));
// Algemene voorwaarden
navDrawerItems.add(new NavDrawerItem(navMenuTitles[4], navMenuIcons.getResourceId(4, -1)));
// Admin panel
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);
// 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
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);
}
}
/* *
* 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
*
* hier ook niewe fragments toevoegen qua paginas
*
*
* */
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 RoosterFragment();
break;
case 2:
fragment = new VervangingFragment();
break;
case 3:
fragment = new KaartFragment();
break;
case 4:
fragment = new VoorwaardenFragment();
break;
case 5:
fragment = new AdminPanelFragment();
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);
}
}
logcat
10-14 15:31:33.751: E/AndroidRuntime(30585): FATAL EXCEPTION: main
10-14 15:31:33.751: E/AndroidRuntime(30585): Process: info.androidhive.listviewfeed, PID: 30585
10-14 15:31:33.751: E/AndroidRuntime(30585): java.lang.RuntimeException: Unable to start activity ComponentInfo{info.androidhive.listviewfeed/com.BijCasperApp.slidingmenu.MainActivity}: java.lang.NullPointerException
10-14 15:31:33.751: E/AndroidRuntime(30585): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2413)
10-14 15:31:33.751: E/AndroidRuntime(30585): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2471)
10-14 15:31:33.751: E/AndroidRuntime(30585): at android.app.ActivityThread.access$900(ActivityThread.java:175)
10-14 15:31:33.751: E/AndroidRuntime(30585): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1308)
10-14 15:31:33.751: E/AndroidRuntime(30585): at android.os.Handler.dispatchMessage(Handler.java:102)
10-14 15:31:33.751: E/AndroidRuntime(30585): at android.os.Looper.loop(Looper.java:146)
10-14 15:31:33.751: E/AndroidRuntime(30585): at android.app.ActivityThread.main(ActivityThread.java:5602)
10-14 15:31:33.751: E/AndroidRuntime(30585): at java.lang.reflect.Method.invokeNative(Native Method)
10-14 15:31:33.751: E/AndroidRuntime(30585): at java.lang.reflect.Method.invoke(Method.java:515)
10-14 15:31:33.751: E/AndroidRuntime(30585): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1283)
10-14 15:31:33.751: E/AndroidRuntime(30585): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1099)
10-14 15:31:33.751: E/AndroidRuntime(30585): at dalvik.system.NativeStart.main(Native Method)
10-14 15:31:33.751: E/AndroidRuntime(30585): Caused by: java.lang.NullPointerException
10-14 15:31:33.751: E/AndroidRuntime(30585): at com.BijCasperApp.slidingmenu.MainActivity.onCreate(MainActivity.java:103)
10-14 15:31:33.751: E/AndroidRuntime(30585): at android.app.Activity.performCreate(Activity.java:5451)
10-14 15:31:33.751: E/AndroidRuntime(30585): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1093)
10-14 15:31:33.751: E/AndroidRuntime(30585): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2377)
10-14 15:31:33.751: E/AndroidRuntime(30585): ... 11 more
why do I get a nullpointerexception when starting the app?
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