用于ActionBar搜索的ExpandedView上的空指针

Question

我有一个SearchView在我的ActionBar.我也有一个MainFragmentActivity加载搜索onCreateOptionsMenu.当我交换Fragment进出的SearchView工作正常 - 有一个例外:特别是Fragment我加载的地方:

FragmentTransaction t = fm.beginTransaction();
SherlockListFragment mFrag = new RateReviewFragment();

t.add(R.id.main_frag, mFrag);
t.setCustomAnimations(R.anim.animation_leave, R.anim.animation_enter,
        R.anim.animation_leave, R.anim.animation_enter);
t.show(mFrag);
t.addToBackStack(null);
t.commit();

这里唯一的区别是我将它添加到backstack.当我在这个片段显示时尝试在ActionBar中点击SearchView,或者在此片段显示之后的任何片段(在此片段关闭后我弹出后面的堆栈并清除它),然后我得到以下错误.它很难诊断,因为它没有显示在我的代码中.

06-17 10:03:33.668: E/AndroidRuntime(9224): FATAL EXCEPTION: main
06-17 10:03:33.668: E/AndroidRuntime(9224): java.lang.NullPointerException
06-17 10:03:33.668: E/AndroidRuntime(9224):     at com.android.internal.widget.ActionBarView$ExpandedActionViewMenuPresenter.expandItemActionView(ActionBarView.java:1470)
06-17 10:03:33.668: E/AndroidRuntime(9224):     at com.android.internal.view.menu.MenuBuilder.expandItemActionView(MenuBuilder.java:1233)
06-17 10:03:33.668: E/AndroidRuntime(9224):     at com.android.internal.view.menu.MenuItemImpl.expandActionView(MenuItemImpl.java:620)
06-17 10:03:33.668: E/AndroidRuntime(9224):     at com.android.internal.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:879)
06-17 10:03:33.668: E/AndroidRuntime(9224):     at com.android.internal.view.menu.ActionMenuView.invokeItem(ActionMenuView.java:524)
06-17 10:03:33.668: E/AndroidRuntime(9224):     at com.android.internal.view.menu.ActionMenuItemView.onClick(ActionMenuItemView.java:131)
06-17 10:03:33.668: E/AndroidRuntime(9224):     at android.view.View.performClick(View.java:4102)
06-17 10:03:33.668: E/AndroidRuntime(9224):     at android.view.View$PerformClick.run(View.java:17085)
06-17 10:03:33.668: E/AndroidRuntime(9224):     at android.os.Handler.handleCallback(Handler.java:615)
06-17 10:03:33.668: E/AndroidRuntime(9224):     at android.os.Handler.dispatchMessage(Handler.java:92)
06-17 10:03:33.668: E/AndroidRuntime(9224):     at android.os.Looper.loop(Looper.java:155)
06-17 10:03:33.668: E/AndroidRuntime(9224):     at android.app.ActivityThread.main(ActivityThread.java:5454)
06-17 10:03:33.668: E/AndroidRuntime(9224):     at java.lang.reflect.Method.invokeNative(Native Method)
06-17 10:03:33.668: E/AndroidRuntime(9224):     at java.lang.reflect.Method.invoke(Method.java:511)
06-17 10:03:33.668: E/AndroidRuntime(9224):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1029)
06-17 10:03:33.668: E/AndroidRuntime(9224):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:796)
06-17 10:03:33.668: E/AndroidRuntime(9224):     at dalvik.system.NativeStart.main(Native Method)

这是我收到此错误后为数不多的变化之一:

android:title="Search"
android:showAsAction="always|collapseActionView"

此外,这在 FragmentActivity

searchView.setOnQueryTextListener(new OnQueryTextListener() {
        public boolean onQueryTextChange(String arg0) {
            // TODO Auto-generated method stub
            return false;
        }

        public boolean onQueryTextSubmit(String arg0) {
            if (searchItem != null) {
                searchItem.collapseActionView();
            }
            return false;
        }

    });

这是实施的,因此SearchView在提交时自动关闭.注意:我正在使用ActionBarSherlock.

Answer 1

我遇到了完全相同的问题.经过大量痛苦的试验和错误后,我终于发现在我的情况下,问题是将图标设置为null:

getSupportActionBar().setIcon(null);

执行此操作后,ActionBarSherlock在尝试显示ActionView时发生加密崩溃.

我希望你的情况类似.