My problem is that I have a ListActivity class and when I go to execute logout function I have a nullpointerexception because getApplicationContext is null.
The problem is here:
userFunction.logoutUser(getApplicationContext());
class Cloudy:
public class Cloudy extends ListActivity {
private static final int LOGOUT = 4;
private LinkedList<String> mListItems;
private PullToRefreshListView mPullRefreshListView;
private ArrayAdapter<String> mAdapter;
private UserFunctions userFunction;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_cloudy);
mPullRefreshListView = (PullToRefreshListView) findViewById(R.id.pull_refresh_list);
// Set a listener to be invoked when the list should be refreshed.
mPullRefreshListView.setOnRefreshListener(new OnRefreshListener<ListView>() {
@Override
public void onRefresh(PullToRefreshBase<ListView> refreshView) {
String label = DateUtils.formatDateTime(getApplicationContext(), System.currentTimeMillis(), DateUtils.FORMAT_SHOW_TIME
| DateUtils.FORMAT_SHOW_DATE | DateUtils.FORMAT_ABBREV_ALL);
// Update the LastUpdatedLabel
refreshView.getLoadingLayoutProxy().setLastUpdatedLabel(label);
// Do work to refresh the list here.
new GetDataTask().execute();
}
});
// Add an end-of-list listener
mPullRefreshListView.setOnLastItemVisibleListener(new OnLastItemVisibleListener() {
@Override
public void onLastItemVisible() {
Toast.makeText(Cloudy.this, "End of List!", Toast.LENGTH_SHORT).show();
}
});
ListView actualListView = mPullRefreshListView.getRefreshableView();
// Need to use the Actual ListView when registering for Context Menu
registerForContextMenu(actualListView);
mListItems = new LinkedList<String>();
mListItems.addAll(Arrays.asList(mStrings));
mAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, mListItems);
/**
* Add Sound Event Listener
*/
SoundPullEventListener<ListView> soundListener = new SoundPullEventListener<ListView>(this);
soundListener.addSoundEvent(State.PULL_TO_REFRESH, R.raw.pull_event);
soundListener.addSoundEvent(State.RESET, R.raw.reset_sound);
soundListener.addSoundEvent(State.REFRESHING, R.raw.refreshing_sound);
mPullRefreshListView.setOnPullEventListener(soundListener);
// You can also just use setListAdapter(mAdapter) or
// mPullRefreshListView.setAdapter(mAdapter)
actualListView.setAdapter(mAdapter);
}
private class GetDataTask extends AsyncTask<Void, Void, String[]> {
@Override
protected String[] doInBackground(Void... params) {
// Simulates a background job.
try {
Thread.sleep(4000);
} catch (InterruptedException e) {
}
return mStrings;
}
@Override
protected void onPostExecute(String[] result) {
mListItems.addFirst("Added after refresh...");
mAdapter.notifyDataSetChanged();
// Call onRefreshComplete when the list has been refreshed.
mPullRefreshListView.onRefreshComplete();
super.onPostExecute(result);
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
menu.add(Menu.NONE, LOGOUT, Menu.NONE, "Logout");
return super.onCreateOptionsMenu(menu);
}
@Override
public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo) {
AdapterContextMenuInfo info = (AdapterContextMenuInfo) menuInfo;
menu.setHeaderTitle("Item: " + getListView().getItemAtPosition(info.position));
menu.add("Item 1");
menu.add("Item 2");
menu.add("Item 3");
menu.add("Item 4");
super.onCreateContextMenu(menu, v, menuInfo);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case LOGOUT:
userFunction.logoutUser(getApplicationContext());
Intent intent = new Intent(Cloudy.this, Login.class);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(intent);
finish();
break;
}
return super.onOptionsItemSelected(item);
}
private String[] mStrings = { "Abbaye de Belloc", "Abbaye du Mont des Cats", "Abertam", "Abondance", "Ackawi", "Acorn", "Adelost", "Affidelice au Chablis",
"Afuega'l Pitu", "Airag", "Airedale", "Aisy Cendre", "Allgauer Emmentaler", "Abbaye de Belloc", "Abbaye du Mont des Cats", "Abertam", "Abondance",
"Ackawi", "Acorn", "Adelost", "Affidelice au Chablis", "Afuega'l Pitu", "Airag", "Airedale", "Aisy Cendre", "Allgauer Emmentaler" };
}
log:
05-13 21:17:41.717: E/AndroidRuntime(3716): FATAL EXCEPTION: main
05-13 21:17:41.717: E/AndroidRuntime(3716): Process: com.ramon.cloudy, PID: 3716
05-13 21:17:41.717: E/AndroidRuntime(3716): java.lang.NullPointerException
05-13 21:17:41.717: E/AndroidRuntime(3716): at com.ramon.cloudy.Cloudy.onOptionsItemSelected(Cloudy.java:142)
05-13 21:17:41.717: E/AndroidRuntime(3716): at android.app.Activity.onMenuItemSelected(Activity.java:2687)
05-13 21:17:41.717: E/AndroidRuntime(3716): at com.android.internal.policy.impl.PhoneWindow.onMenuItemSelected(PhoneWindow.java:1103)
05-13 21:17:41.717: E/AndroidRuntime(3716): at com.android.internal.view.menu.MenuBuilder.dispatchMenuItemSelected(MenuBuilder.java:735)
05-13 21:17:41.717: E/AndroidRuntime(3716): at com.android.internal.view.menu.MenuItemImpl.invoke(MenuItemImpl.java:152)
05-13 21:17:41.717: E/AndroidRuntime(3716): at com.android.internal.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:874)
05-13 21:17:41.717: E/AndroidRuntime(3716): at com.android.internal.view.menu.ListMenuPresenter.onItemClick(ListMenuPresenter.java:177)
05-13 21:17:41.717: E/AndroidRuntime(3716): at android.widget.AdapterView.performItemClick(AdapterView.java:308)
05-13 21:17:41.717: E/AndroidRuntime(3716): at android.widget.AbsListView.performItemClick(AbsListView.java:1478)
05-13 21:17:41.717: E/AndroidRuntime(3716): at android.widget.AbsListView$PerformClick.run(AbsListView.java:3480)
05-13 21:17:41.717: E/AndroidRuntime(3716): at android.widget.AbsListView$3.run(AbsListView.java:4823)
05-13 21:17:41.717: E/AndroidRuntime(3716): at android.os.Handler.handleCallback(Handler.java:733)
05-13 21:17:41.717: E/AndroidRuntime(3716): at android.os.Handler.dispatchMessage(Handler.java:95)
05-13 21:17:41.717: E/AndroidRuntime(3716): at android.os.Looper.loop(Looper.java:157)
05-13 21:17:41.717: E/AndroidRuntime(3716): at android.app.ActivityThread.main(ActivityThread.java:5356)
05-13 21:17:41.717: E/AndroidRuntime(3716): at java.lang.reflect.Method.invokeNative(Native Method)
05-13 21:17:41.717: E/AndroidRuntime(3716): at java.lang.reflect.Method.invoke(Method.java:515)
05-13 21:17:41.717: E/AndroidRuntime(3716): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1265)
05-13 21:17:41.717: E/AndroidRuntime(3716): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1081)
05-13 21:17:41.717: E/AndroidRuntime(3716): at dalvik.system.NativeStart.main(Native Method)
