Intrumentation类：ActivityInstrume

public abstract class
ActivityInstrumentationTestCase2
extends ActivityTestCase//继承自ActivityTestCase类
This class provides functional testing of a single activity. The activity under test will be created using the system infrastructure (by calling InstrumentationTestCase.launchActivity()) and you will then be able to manipulate your Activity directly.

该类提供单独的activity的功能测试.在测试项目下的该activity能够使用系统基类（调用：InstrumentationTestCase.launchActivity()）并且你能够直接操作你自己的Activity的。
You can run any test method on the UI thread (see UiThreadTest
).//你能够在UI thread上跑任何的测试方法
You can inject custom Intents into your Activity (see setActivityIntent(Intent)
).//你能够在你的Activity注入自定义的Intents(该描述意味着允许跳转)

This class replaces ActivityInstrumentationTestCase
, which is deprecated. New tests should be written using this base class.//该类替代ActivityInstrumentationTestCase
, 该类现在不建议使用。新的测试集应该使用该基础类。
If you prefer an isolated unit test, see ActivityUnitTestCase
.//如果你更喜欢一个独立的单元测试,请参见ActivityUnitTestCase

Summary:
Public Constructors:
ActivityInstrumentationTestCase2(String pkg, Class<T> activityClass)
//This constructor was deprecated in API level 8. use ActivityInstrumentationTestCase2(Class)
instead(在高于API level 8后，该构造方法被下方的方法取代了)

ActivityInstrumentationTestCase2(Class<T> activityClass)
//Creates an ActivityInstrumentationTestCase2.

Public Methods:
T
getActivity()Get the Activity under test, starting it if necessary.//获取在测试下的Activity，如果必要的话可以启动

void
setActivityInitialTouchMode(boolean initialTouchMode)Call this method before the first call to getActivity()
to set the initial touch mode for the Activity under test.//在第一次调用 getActivity()
方法前可以调用该方法去初始化测试下Activity的TOUCH模式

void
setActivityIntent(Intent i)Call this method before the first call to getActivity()
to inject a customized Intent into the Activity under test.//在第一次调用 getActivity()
方法前可以调用该方法去注入测试下Activity的自定义的INTENT

Protected Methods

void
runTest()Runs the current unit test.

void
setUp()Sets up the fixture, for example, open a network connection.

void
tearDown()Make sure all resources are cleaned up and garbage collected before moving on to the next test.