@xiyue 麻烦看下我的报错信息
public class ApplicationTest extends UiAutomatorTestCase { //这里是第 10 行

public void testDemo() throws UiObjectNotFoundException {
getUiDevice().pressHome();
UiObject Calculator = new UiObject(new UiSelector().description("计算器"));

执行结果：
Running tests
Test running started
junit.framework.AssertionFailedError: Exception in constructor: testDemo (java.lang.RuntimeException: Stub!
at com.android.uiautomator.testrunner.UiAutomatorTestCase.(UiAutomatorTestCase.java:5)
at com.example.helloworld.mynewapplication.ApplicationTest.(ApplicationTest.java:10)
at java.lang.reflect.Constructor.newInstance(Native Method)
at junit.runner.BaseTestRunner.getTest(BaseTestRunner.java:118)
at android.test.AndroidTestRunner.getTest(AndroidTestRunner.java:149)
at android.test.AndroidTestRunner.setTestClassName(AndroidTestRunner.java:57)
at android.test.suitebuilder.TestSuiteBuilder.addTestClassByName(TestSuiteBuilder.java:78)
at android.test.InstrumentationTestRunner.parseTestClass(InstrumentationTestRunner.java:444)
at android.test.InstrumentationTestRunner.parseTestClasses(InstrumentationTestRunner.java:425)
at android.test.InstrumentationTestRunner.onCreate(InstrumentationTestRunner.java:371)
at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4685)
at android.app.ActivityThread.-wrap1(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1404)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5401)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:725)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:615)
)
at android.test.AndroidTestRunner.runTest(AndroidTestRunner.java:191)
at android.test.AndroidTestRunner.runTest(AndroidTestRunner.java:176)
at android.test.InstrumentationTestRunner.onStart(InstrumentationTestRunner.java:555)
at android.app.Instrumentation$InstrumentationThread.run(Instrumentation.java:1862)