运行Robolectric（一）

因为Robolectric是在项目开发过程当中引入的，因此要跑起来时就遇到了各类问题，下面整理一下运行过程当中我的遇到的问题和解决方法。

1、

现象：

java.lang.IllegalStateException: there must have been some overlap for resourceIdToResName! expected 4897 but got 4896
	at org.robolectric.res.MergedResourceIndex.merge(MergedResourceIndex.java:25)
	at org.robolectric.res.MergedResourceIndex.<init>(MergedResourceIndex.java:17)
	at org.robolectric.res.RoutingResourceLoader.<init>(RoutingResourceLoader.java:22)
	at org.robolectric.RobolectricTestRunner.createAppResourceLoader(RobolectricTestRunner.java:601)
	at org.robolectric.RobolectricTestRunner.getAppResourceLoader(RobolectricTestRunner.java:585)
	at org.robolectric.internal.ParallelUniverse.setUpApplicationState(ParallelUniverse.java:89)
	at org.robolectric.RobolectricTestRunner.setUpApplicationState(RobolectricTestRunner.java:404)
	at org.robolectric.RobolectricTestRunner$2.evaluate(RobolectricTestRunner.java:220)
	at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
	at org.robolectric.RobolectricTestRunner$1.evaluate(RobolectricTestRunner.java:175)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
	at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
	at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)

解决方法：

这是是因为在部分的layout xml中，一些“android:id="@android :id/**"”致使的，具体缘由和具体哪些xml致使，我不清楚。因为项目中多个xml使用了“@android：id/**”，为了程序的稳定和不遗漏任何地方，我把xml中全部没必要要的“@android :id/**”改成“@+id/**”或者"@id/**"（注意：TabHost对象及其相关对象必选使用“@android :id/tabs”），同时把java文件对应的读取方法改掉。

2、Looper.getMainLooper()

现象：

Caused by: java.lang.NullPointerException
	at org.robolectric.shadows.ShadowLooper.getMainLooper(ShadowLooper.java:59)
	at android.os.Looper.getMainLooper(Looper.java)
	at com.example.app.MyApplication.<clinit>(MyApplication.java:277) ... 25 more

解决方法：(去掉Looper.getMainLooper())

//private static Handler handler = new Handler(Looper.getMainLooper()) {
	//for Robolectric Unit Test
	private static Handler handler = new Handler() {

注意：在实际场景时，须要考虑去掉的影响，或者能够采起其余替代方法，如 runOnUiThread()。

3、

现象：

java.lang.NullPointerException
	at android.app.Activity.onCreate(Activity.java:874)
	at com.example.activity.SplashScreenActivity.onCreate(SplashScreenActivity.java:39)
	at com.example.activity.SplashScreenActivityTest.setUp(SplashScreenActivityTest.java:29)
	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
	at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:24)
	at org.robolectric.RobolectricTestRunner$2.evaluate(RobolectricTestRunner.java:234)
	at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
	at org.robolectric.RobolectricTestRunner$1.evaluate(RobolectricTestRunner.java:175)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
	at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
	at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)

解决方法：

private SplashScreenActivity activity;

	@Before
	public void setUp()
	{
//		activity = new SplashScreenActivity();
//		Intent newIntent = new Intent();
//		activity.setIntent(newIntent);
//		activity.onCreate(null);
		
		activity = Robolectric.buildActivity(SplashScreenActivity.class)
		        .create().get();
	}