It's a bug. use Android:title attribute in your menu items.
ABS with SherlockFragmentActivity
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14-10-2022 - |
Frage
I am implementing ActionBarSherlock with Fragments. I've done it many times but never with Fragments. I am not sure if I have to implement it in every fragment or just using it in FragmentActivity is enough. Whenever i click any item of ActionBar, I get runtime NullPointerException.
Here is my FragmentActivity. P.S. all my Fragments are extending SherlockFragment.
package com.vipulk.acuv;
public class ViewPagerFragmentActivity extends SherlockFragmentActivity{
/** maintains the pager adapter*/
private PagerAdapter mPagerAdapter;
com.actionbarsherlock.app.ActionBar actionbar;
com.actionbarsherlock.view.Menu menu;
Context context;
/* (non-Javadoc)
* @see android.support.v4.app.FragmentActivity#onCreate(android.os.Bundle)
*/
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
super.setContentView(R.layout.layout);
//initialsie the pager
this.initialisePaging();
initializeAbs();
}
private void initializeAbs() {
// TODO Auto-generated method stub
MyApplication myapp=(MyApplication)getApplicationContext();
actionbar=getSupportActionBar();
getSupportActionBar().setIcon(R.drawable.ic_add_user);
getSupportActionBar().setDisplayShowTitleEnabled(true);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setDisplayShowHomeEnabled(true);
}
/**
* Initialise the fragments to be paged
*/
private void initialisePaging() {
//Set the pager with an adapter
List<SherlockFragment> fragments = new Vector<SherlockFragment>();
fragments.add((SherlockFragment) SherlockFragment.instantiate(this, Tab1Fragment.class.getName()));
fragments.add((SherlockFragment) SherlockFragment.instantiate(this, ChangedContact.class.getName()));
fragments.add((SherlockFragment) SherlockFragment.instantiate(this, Friends.class.getName()));
this.mPagerAdapter = new com.vipulk.acuv.PagerAdapter(getSupportFragmentManager(), fragments);
//
ViewPager pager = (ViewPager)super.findViewById(R.id.viewpager);
pager.setAdapter(this.mPagerAdapter);
pager.setCurrentItem(1, false);
pager.setOffscreenPageLimit(3);
}
public boolean onPrepareOptionsMenu(com.actionbarsherlock.view.Menu menu) {
com.actionbarsherlock.view.MenuInflater inflater= getSupportMenuInflater();
inflater.inflate(R.menu.menu_register, menu);
return super.onPrepareOptionsMenu(menu);
}
public boolean onOptionsItemSelected(com.actionbarsherlock.view.MenuItem item) {
switch (item.getItemId()) {
case R.id.register:
Intent i=new Intent(ViewPagerFragmentActivity.this, Registration.class);
startActivity(i);
return true;
default:
return super.onOptionsItemSelected(item);
}
}
}
Here is the Log:
02-21 20:44:45.428: W/dalvikvm(2556): threadid=1: thread exiting with uncaught exception (group=0x40a71930)
02-21 20:44:45.498: E/AndroidRuntime(2556): FATAL EXCEPTION: main
02-21 20:44:45.498: E/AndroidRuntime(2556): java.lang.NullPointerException
02-21 20:44:45.498: E/AndroidRuntime(2556): at com.android.internal.view.menu.MenuItemImpl.toString(MenuItemImpl.java:496)
02-21 20:44:45.498: E/AndroidRuntime(2556): at java.lang.StringBuilder.append(StringBuilder.java:202)
02-21 20:44:45.498: E/AndroidRuntime(2556): at com.actionbarsherlock.app.SherlockFragmentActivity.onMenuItemSelected(SherlockFragmentActivity.java:201)
02-21 20:44:45.498: E/AndroidRuntime(2556): at com.android.internal.policy.impl.PhoneWindow.onMenuItemSelected(PhoneWindow.java:980)
02-21 20:44:45.498: E/AndroidRuntime(2556): at com.android.internal.view.menu.MenuBuilder.dispatchMenuItemSelected(MenuBuilder.java:735)
02-21 20:44:45.498: E/AndroidRuntime(2556): at com.android.internal.view.menu.MenuItemImpl.invoke(MenuItemImpl.java:149)
02-21 20:44:45.498: E/AndroidRuntime(2556): at com.android.internal.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:874)
02-21 20:44:45.498: E/AndroidRuntime(2556): at com.android.internal.view.menu.ActionMenuView.invokeItem(ActionMenuView.java:547)
02-21 20:44:45.498: E/AndroidRuntime(2556): at com.android.internal.view.menu.ActionMenuItemView.onClick(ActionMenuItemView.java:115)
02-21 20:44:45.498: E/AndroidRuntime(2556): at android.view.View.performClick(View.java:4204)
02-21 20:44:45.498: E/AndroidRuntime(2556): at android.view.View$PerformClick.run(View.java:17355)
02-21 20:44:45.498: E/AndroidRuntime(2556): at android.os.Handler.handleCallback(Handler.java:725)
02-21 20:44:45.498: E/AndroidRuntime(2556): at android.os.Handler.dispatchMessage(Handler.java:92)
02-21 20:44:45.498: E/AndroidRuntime(2556): at android.os.Looper.loop(Looper.java:137)
02-21 20:44:45.498: E/AndroidRuntime(2556): at android.app.ActivityThread.main(ActivityThread.java:5041)
02-21 20:44:45.498: E/AndroidRuntime(2556): at java.lang.reflect.Method.invokeNative(Native Method)
02-21 20:44:45.498: E/AndroidRuntime(2556): at java.lang.reflect.Method.invoke(Method.java:511)
02-21 20:44:45.498: E/AndroidRuntime(2556): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
02-21 20:44:45.498: E/AndroidRuntime(2556): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
02-21 20:44:45.498: E/AndroidRuntime(2556): at dalvik.system.NativeStart.main(Native Method)
02-21 20:44:49.238: I/Process(2556): Sending signal. PID: 2556 SIG: 9
Lösung
Andere Tipps
It was a bug in ActionBarSherlock. Fixed it. The Activity com.android.internal.view.menu.MenuItemImpl of ABS have a method toString() that was giving NullPointerException because "androi:title" attribute wasn't set for my Menu items. Soif you are getting similar problem, simply add an "android:title" attribute to menu item (in your xml menu)