Robolectric使用片段和ActionBarCompat NullPointerException

我有一个android应用程序使用片段，并已实施ActionBarCompat。我写了如下简单Robolectric测试：Robolectric使用片段和ActionBarCompat NullPointerException

@Test 
public void shouldNotBeNull() throws Exception { 
    MainFragment mainFragment = new MainFragment(); 
    startFragment(mainFragment); 
    assertThat(mainFragment, notNullValue()); 
    assertThat(mainFragment.getActivity(), notNullValue()); 
} 

private void startFragment(MainFragment fragment) { 
    FragmentActivity activity = new FragmentActivity(); 
    shadowOf(activity).callOnCreate(null); 
    shadowOf(activity).callOnStart(); 
    shadowOf(activity).callOnResume(); 

    FragmentManager fragmentManager = activity.getSupportFragmentManager(); 
    FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction(); 
    fragmentTransaction.add(fragment, null); 
    fragmentTransaction.commit(); 
}

我得到以下异常：

java.lang.NullPointerException: null 
at android.app.Activity.invalidateOptionsMenu(Activity.java:2595) 
at android.support.v4.app.ActivityCompatHoneycomb.invalidateOptionsMenu(ActivityCompatHoneycomb.java:30) 
at android.support.v4.app.FragmentActivity.supportInvalidateOptionsMenu(FragmentActivity.java:572) 
at android.support.v4.app.Fragment.setHasOptionsMenu(Fragment.java:708) 
at com.example.android.ui.MainFragment.onCreate(MainFragment.java:599) 
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:834) 
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1080) 
at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:622) 
at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1416) 
at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:420) 
at org.robolectric.util.Scheduler.postDelayed(Scheduler.java:37) 
at org.robolectric.shadows.ShadowLooper.post(ShadowLooper.java:198) 
at org.robolectric.shadows.ShadowHandler.postDelayed(ShadowHandler.java:56) 
at org.robolectric.shadows.ShadowHandler.post(ShadowHandler.java:51) 
at android.os.Handler.post(Handler.java) 
at android.support.v4.app.FragmentManagerImpl.enqueueAction(FragmentManager.java:1322) 
at android.support.v4.app.BackStackRecord.commitInternal(BackStackRecord.java:541) 
at android.support.v4.app.BackStackRecord.commit(BackStackRecord.java:525) 
at com.example.android.ui.MainFragmentTest.startFragment(MainFragmentTest.java:36) 
at com.example.android.ui.MainFragmentTest.shouldNotBeNull(MainFragmentTest.java:22)

当使用这样的事情：

MainActivity activity = new MainActivity(); 
shadowOf(activity).callOnCreate(null); 
shadowOf(activity).callOnStart(); 
shadowOf(activity).callOnResume();

其中MainActivity是持有人活动MainFragment，我得到以下例外：

java.lang.RuntimeException: java.lang.reflect.InvocationTargetException 
at org.robolectric.res.builder.RobolectricPackageManager.getActivityInfo(RobolectricPackageManager.java:59) 
at android.support.v7.app.ActionBarActivityDelegate.getUiOptionsFromMetadata(ActionBarActivityDelegate.java:157) 
at android.support.v7.app.ActionBarActivityDelegateICS.onCreate(ActionBarActivityDelegateICS.java:53) 
at android.support.v7.app.ActionBarActivity.onCreate(ActionBarActivity.java:98) 
at com.example.android.ui.MainActivity.onCreate(MainActivity.java:45) 
at org.robolectric.shadows.ShadowActivity.invokeReflectively(ShadowActivity.java:176) 
at org.robolectric.shadows.ShadowActivity.callOnCreate(ShadowActivity.java:121) 
at com.example.android.ui.MainFragmentTest.startFragment(MainFragmentTest.java:28) 
at com.example.android.ui.MainFragmentTest.shouldNotBeNull(MainFragmentTest.java:22)

我怀疑它可能是关于ActionBarCompat和Robolectric不兼容的东西。任何帮助，将不胜感激。

来源

2013-08-06 Nemanja Milkov

是什么'shadowOf（活动）'返回：所以需要以下操作以防止可能重复的依赖关系（从here参考）显然Robolectric都有自己的支持库的版本？ – Terry

感谢您的参与。关于shadowOf方法的解释，在robolectric网站上给出了最好的一个：“有时Android类不提供访问被测Android对象状态的方法。Robolectric.shadowOf（）方法提供对影子实例的引用Android对象，允许测试断言状态，否则不可用“。否则，您认为shadowOf（activity）在调试时返回null，而id不会。 –

这个问题btw仍然存在，所以任何建议将是有益的。 –

从Robolectric 2.4开始，它应该支持Appcompat库。有几个小问题，因为它不能用于开箱即用。事情帮我：在build.gradle

target=android-19 android.library.reference.1=/../../build/intermediates/exploded-aar/com.android.support/appcompat-v7/20.0.0  
android.library.reference.2=/../../build/intermediates/exploded-aar/com.android.support/support-v4/20.0.0 
android.library.reference.3=/../../build/intermediates/exploded-aar/com.viewpagerindicator/library/2.4.1

设置exculdes：

创建project.properties文件具有以下内容

如the config manual描述for Robolectric

androidTestCompile('org.robolectric:robolectric:2.4') { 
    exclude module: 'classworlds' 
    exclude module: 'commons-logging' 
    exclude module: 'httpclient' 
    exclude module: 'maven-artifact' 
    exclude module: 'maven-artifact-manager' 
    exclude module: 'maven-error-diagnostics' 
    exclude module: 'maven-model' 
    exclude module: 'maven-project' 
    exclude module: 'maven-settings' 
    exclude module: 'plexus-container-default' 
    exclude module: 'plexus-interpolation' 
    exclude module: 'plexus-utils' 
    exclude module: 'wagon-file' 
    exclude module: 'wagon-http-lightweight' 
    exclude module: 'wagon-provider-api' 
    exclude group: 'com.android.support', module: 'support-v4' 
    exclude group: 'com.android.support', module: 'appcompat-v7' }

来源

2014-12-08 03:27:19 p4sh4

Robolectric使用片段和ActionBarCompat NullPointerException

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