Android ShadowSystemClock NullPointerException
我在Robolectric测试用例中实例化CustomaApplication.class时遇到了问题,这一行正好是Android ShadowSystemClock NullPointerException,android,nullpointerexception,tdd,robolectric,Android,Nullpointerexception,Tdd,Robolectric,我在Robolectric测试用例中实例化CustomaApplication.class时遇到了问题,这一行正好是private long value=SystemClock.elapsedRealtime()。通过简单地扩展Deckard应用程序,我使用示例项目进行了一些测试: public class DeckardApplication extends Application { private long value = SystemClock.elapsedRealtime(
private long value=SystemClock.elapsedRealtime()
。通过简单地扩展Deckard应用程序,我使用示例项目进行了一些测试:
public class DeckardApplication extends Application {
private long value = SystemClock.elapsedRealtime();
}
这会导致完全相同的错误:
Caused by: java.lang.NullPointerException
at org.robolectric.shadows.ShadowLooper.getMainLooper(ShadowLooper.java:59)
at android.os.Looper.getMainLooper(Looper.java)
at org.robolectric.Robolectric.getUiThreadScheduler(Robolectric.java:1244)
at org.robolectric.shadows.ShadowSystemClock.now(ShadowSystemClock.java:15)
at org.robolectric.shadows.ShadowSystemClock.uptimeMillis(ShadowSystemClock.java:30)
at org.robolectric.shadows.ShadowSystemClock.elapsedRealtime(ShadowSystemClock.java:35)
at android.os.SystemClock.elapsedRealtime(SystemClock.java)
at com.example.DeckardApplication.<init>(DeckardApplication.java:8)
at java.lang.Class.newInstance(Class.java:374)
at org.robolectric.DefaultTestLifecycle.createApplication(DefaultTestLifecycle.java:46)
at org.robolectric.DefaultTestLifecycle.createApplication(DefaultTestLifecycle.java:13)
at org.robolectric.internal.ParallelUniverse.setUpApplicationState(ParallelUniverse.java:100)
at org.robolectric.RobolectricTestRunner.setUpApplicationState(RobolectricTestRunner.java:404)
at org.robolectric.RobolectricTestRunner$2.evaluate(RobolectricTestRunner.java:220)
at org.junit.runners.BlockJUnit4ClassRunner.runNotIgnored(BlockJUnit4ClassRunner.java:79)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:71)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:49)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)
at org.robolectric.RobolectricTestRunner$1.evaluate(RobolectricTestRunner.java:175)
at org.junit.runners.ParentRunner.run(ParentRunner.java:236)
at org.apache.maven.surefire.junit4.JUnit4TestSet.execute(JUnit4TestSet.java:59)
at org.apache.maven.surefire.suite.AbstractDirectoryTestSuite.executeTestSet(AbstractDirectoryTestSuite.java:120)
at org.apache.maven.surefire.suite.AbstractDirectoryTestSuite.execute(AbstractDirectoryTestSuite.java:103)
at org.apache.maven.surefire.Surefire.run(Surefire.java:169)
... 2 more
原因:java.lang.NullPointerException
位于org.roblectric.shadows.ShadowLooper.getMainLooper(ShadowLooper.java:59)
位于android.os.Looper.getMainLooper(Looper.java)
位于org.roblectric.roblectric.getUiThreadScheduler(roblectric.java:1244)
位于org.roblectric.shadows.ShadowSystemClock.now(ShadowSystemClock.java:15)
位于org.roblectric.shadows.ShadowSystemClock.uptimeMillis(ShadowSystemClock.java:30)
位于org.roblectric.shadows.ShadowSystemClock.elapsedRealtime(ShadowSystemClock.java:35)
位于android.os.SystemClock.elapsedRealtime(SystemClock.java)
位于com.example.DeckardApplication.(DeckardApplication.java:8)
位于java.lang.Class.newInstance(Class.java:374)
位于org.roblectric.DefaultTestLifecycle.createApplication(DefaultTestLifecycle.java:46)
位于org.roblectric.DefaultTestLifecycle.createApplication(DefaultTestLifecycle.java:13)
位于org.roblectric.internal.ParallelUniverse.setUpApplicationState(ParallelUniverse.java:100)
位于org.roblectric.roblectrictTestRunner.setUpApplicationState(roblectrictTestRunner.java:404)
位于org.roblectric.roblectrictTestRunner$2.evaluate(roblectrictTestRunner.java:220)
位于org.junit.runners.BlockJUnit4ClassRunner.runNotIgnored(BlockJUnit4ClassRunner.java:79)
位于org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:71)
位于org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:49)
位于org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)
位于org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)
位于org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
访问org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)
位于org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)
位于org.roblectric.roblectrictTestRunner$1.evaluate(roblectrictTestRunner.java:175)
位于org.junit.runners.ParentRunner.run(ParentRunner.java:236)
位于org.apache.maven.surefire.junit4.JUnit4TestSet.execute(JUnit4TestSet.java:59)
位于org.apache.maven.surefire.suite.AbstractDirectoryTestSuite.executeTestSet(AbstractDirectoryTestSuite.java:120)
位于org.apache.maven.surefire.suite.AbstractDirectoryTestSuite.execute(AbstractDirectoryTestSuite.java:103)
位于org.apache.maven.surefire.surefire.run(surefire.java:169)
... 还有两个
如何处理这个错误?我需要提供一些自定义ShadowSystemClock实现吗?有一个提供自定义ShadowSystemClock的解决方案。示例如下:
@Implements(value = SystemClock.class, callThroughByDefault = true)
public static class MyShadowSystemClock {
public static long elapsedRealtime() {
return 0;
}
}
然后将其应用于test@Config(shadows={MyShadowSystemClock.class})
但我仍在等待更好的解决方案。我们也可以使用阴影日历吗?