ActionBarCompat + NavigationDrawerFragment在android 4.0和4.1上不起作用

Question

很奇怪的問題！ 我通過android studio中的新項目向導創建了一個新項目。 我選擇包括GridLayout，Fragments，NavigationDrawer和ActionBar的支持庫。 在下一步中，我選擇了帶有NavigationDrawer導航的BlankActivity模板。 精靈很好地創建了我的項目並構建它沒有任何問題。

問題是，當你嘗試運行它時，它在Android 4.3,4.2和2.3.3上工作正常，但它在4.0和4.1上崩潰。

堆棧跟蹤：

10-30 13:11:31.024    2136-2136/? E/AndroidRuntime﹕ FATAL EXCEPTION: main
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.navdrawer/com.navdrawer.MainActivity}: android.view.InflateException: Binary XML file line #24: Error inflating class fragment
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2059)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084)
        at android.app.ActivityThread.access$600(ActivityThread.java:130)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195)
        at android.os.Handler.dispatchMessage(Handler.java:99)
        at android.os.Looper.loop(Looper.java:137)
        at android.app.ActivityThread.main(ActivityThread.java:4745)
        at java.lang.reflect.Method.invokeNative(Native Method)
        at java.lang.reflect.Method.invoke(Method.java:511)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
        at dalvik.system.NativeStart.main(Native Method)
 Caused by: android.view.InflateException: Binary XML file line #24: Error inflating class fragment
        at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:704)
        at android.view.LayoutInflater.rInflate(LayoutInflater.java:746)
        at android.view.LayoutInflater.inflate(LayoutInflater.java:489)
        at android.view.LayoutInflater.inflate(LayoutInflater.java:396)
        at android.view.LayoutInflater.inflate(LayoutInflater.java:352)
        at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:256)
        at android.app.Activity.setContentView(Activity.java:1867)
        at android.support.v7.app.ActionBarActivity.superSetContentView(ActionBarActivity.java:208)
        at android.support.v7.app.ActionBarActivityDelegateICS.setContentView(ActionBarActivityDelegateICS.java:111)
        at android.support.v7.app.ActionBarActivity.setContentView(ActionBarActivity.java:76)
        at com.navdrawer.MainActivity.onCreate(MainActivity.java:37)
        at android.app.Activity.performCreate(Activity.java:5008)
        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079)
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2023)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084)
            at android.app.ActivityThread.access$600(ActivityThread.java:130)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195)
            at android.os.Handler.dispatchMessage(Handler.java:99)
            at android.os.Looper.loop(Looper.java:137)
            at android.app.ActivityThread.main(ActivityThread.java:4745)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:511)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
            at dalvik.system.NativeStart.main(Native Method)
 Caused by: java.lang.NullPointerException
        at com.navdrawer.MainActivity.onCreateOptionsMenu(MainActivity.java:82)
        at android.app.Activity.onCreatePanelMenu(Activity.java:2476)
        at android.support.v4.app.FragmentActivity.onCreatePanelMenu(FragmentActivity.java:224)
        at android.support.v7.app.ActionBarActivity.superOnCreatePanelMenu(ActionBarActivity.java:224)
        at android.support.v7.app.ActionBarActivityDelegateICS.onCreatePanelMenu(ActionBarActivityDelegateICS.java:141)
        at android.support.v7.app.ActionBarActivity.onCreatePanelMenu(ActionBarActivity.java:199)
        at android.support.v7.app.ActionBarActivityDelegateICS$WindowCallbackWrapper.onCreatePanelMenu(ActionBarActivityDelegateICS.java:280)
        at com.android.internal.policy.impl.PhoneWindow.preparePanel(PhoneWindow.java:393)
        at com.android.internal.policy.impl.PhoneWindow.invalidatePanelMenu(PhoneWindow.java:747)
        at android.app.Activity.invalidateOptionsMenu(Activity.java:2595)
        at android.support.v4.app.ActivityCompatHoneycomb.invalidateOptionsMenu(ActivityCompatHoneycomb.java:29)
        at android.support.v4.app.FragmentActivity.supportInvalidateOptionsMenu(FragmentActivity.java:633)
        at android.support.v7.app.ActionBarActivity.supportInvalidateOptionsMenu(ActionBarActivity.java:170)
        at android.support.v4.app.Fragment.setHasOptionsMenu(Fragment.java:781)
        at com.navdrawer.NavigationDrawerFragment.onCreate(NavigationDrawerFragment.java:82)
        at android.support.v4.app.Fragment.performCreate(Fragment.java:1455)
        at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:893)
        at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1082)
        at android.support.v4.app.FragmentManagerImpl.addFragment(FragmentManager.java:1184)
        at android.support.v4.app.FragmentActivity.onCreateView(FragmentActivity.java:285)
        at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:676)
... 24 mo

這是片段中的onCreateOptionsMenu

 public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
        // If the drawer is open, show the global app actions in the action bar. See also
        // showGlobalContextActionBar, which controls the top-left area of the action bar.
        if (mDrawerLayout != null && isDrawerOpen()) {
            inflater.inflate(R.menu.global, menu);
            showGlobalContextActionBar();
        }
        super.onCreateOptionsMenu(menu, inflater);
    }

這個是在MainActivity中

 @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        if (!mNavigationDrawerFragment.isDrawerOpen()) {
            // Only show items in the action bar relevant to this screen
            // if the drawer is not showing. Otherwise, let the drawer
            // decide what to show in the action bar.
            getMenuInflater().inflate(R.menu.main, menu);
            restoreActionBar();
            return true;
        }
        return super.onCreateOptionsMenu(menu);
    }

Answer 1

剛遇到同樣的問題。 確切的問題。

問題是setHasOptionsMenu(true); 在onCreate調用，而不是在Fragment中調用onActivityCreated 。 如果你問我，似乎是向導中的錯誤。

要解決此問題，請移動setHasOptionsMenu(true); 從onCreate()調用onActivityCreated() 。

這將解決問題。 當調用到Activity#onCreateOptionsMenu ，片段實例將被實例化。

Answer 2

我解決了問題。 堆棧跟蹤對我來說是錯誤的......

問題就像eee在活動中的onCreateOptionsMenu（）中所建議的那樣......

@Override
    public boolean onCreateOptionsMenu(Menu menu) {
        if (!mNavigationDrawerFragment.isDrawerOpen()) {
            // Only show items in the action bar relevant to this screen
            // if the drawer is not showing. Otherwise, let the drawer
            // decide what to show in the action bar.
            getMenuInflater().inflate(R.menu.main, menu);
            restoreActionBar();
            return true;
        }
        return super.onCreateOptionsMenu(menu);
    }

不知何故只在Android 4.1和4.0上mNavigationDrawerFragment為null雖然它在onCreate()初始化所以我把它放

if(mNavigationDrawerFragment == null )
            mNavigationDrawerFragment = (NavigationDrawerFragment)
                    getSupportFragmentManager().findFragmentById(R.id.navigation_drawer);

在onCreate()和onCreateOptionsMenu()方法中

Answer 3

我通過為它添加一個try catch塊解決了這個問題

setHasOptionsMenu(true); 

正如Donn Felker解釋的那樣，異常是在活動創建之前因呼叫而產生的。 處理此異常可以解決問題。