@Override 	public void setUp() throws Exception { 		//setUp() is run before a test case is started.  		//This is where the solo object is created. 		super.setUp();  		//The variable solo has to be static, since every time after a case's finished, this class TCCreateNote would be re-instantiated 		// which would lead to soto to re-instantiated to be null if it's not set as static 		 		if(solo == null) {		 			NotePadTest.solo = new Solo(getInstrumentation(),getActivity());	 		} 	}

2.问题分析

/**      * Utility method for launching an activity with a specific Intent.      *       * 
NOTE: The parameter pkg must refer to the package identifier of the      * package hosting the activity to be launched, which is specified in the AndroidManifest.xml      * file.  This is not necessarily the same as the java package name.      *      * @param pkg The package hosting the activity to be launched.      * @param activityCls The activity class to launch.      * @param intent The intent to launch with      * @return The activity, or null if non launched.      */     @SuppressWarnings("unchecked")     public final  T launchActivityWithIntent(             String pkg,             Class activityCls,             Intent intent) {         intent.setClassName(pkg, activityCls.getName());         intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);         T activity = (T) getInstrumentation().startActivitySync(intent);         getInstrumentation().waitForIdleSync();         return activity;     }

    /**      * Synchronously wait for the application to be idle.  Can not be called      * from the main application thread -- use {@link #start} to execute      * instrumentation in its own thread.      */     public void waitForIdleSync() {         validateNotAppThread();         Idler idler = new Idler(null);         mMessageQueue.addIdleHandler(idler);         mThread.getHandler().post(new EmptyRunnable());         idler.waitForIdle();     }

• 首先确保调用这个方法的来源不是application的主线程
• 然后把当前等待application变成idle的请求放到消息队列中
• 最后等待app在处理完所有事件达到idle状态的时候返回

• 如果目标activity没有起来，那么启动该activity并放在前台
• 如果目标activity已经起来，那么直接放在前台等待被测试
• 如果该该activity所属application在自动不停的接受事件，直接调用getActivity会因为一直等待application变成idle状态而挂起

solo = new Solo(getInstrumentation());

package com.example.android.notepad.tryout;  import com.robotium.solo.Solo;  import android.test.ActivityInstrumentationTestCase2; import android.widget.TextView; import android.app.Activity;  @SuppressWarnings("rawtypes") public class NotePadTest extends ActivityInstrumentationTestCase2{  	private static Solo solo = null; 	public Activity activity; 	 	private static final int NUMBER_TOTAL_CASES = 2; 	private static int run = 0; 	 	private static Class launchActivityClass; 	//对应re-sign.jar生成出来的信息框里的两个值 	private static String mainActiviy = "com.example.android.notepad.NotesList"; 	private static String packageName = "com.example.android.notepad";  	static {  		try {  			launchActivityClass = Class.forName(mainActiviy);  		} catch (ClassNotFoundException e) {  			throw new RuntimeException(e);  		}  	} 	 	 	@SuppressWarnings("unchecked") 	public NotePadTest() { 		super(packageName, launchActivityClass); 	}  	 	@Override 	public void setUp() throws Exception { 		//setUp() is run before a test case is started.  		//This is where the solo object is created. 		super.setUp();  		//The variable solo has to be static, since every time after a case's finished, this class TCCreateNote would be re-instantiated 		// which would lead to soto to re-instantiated to be null if it's not set as static 		//TextView title = (TextView)getActivity().findViewById(Ref.id.title); 		 		if(solo == null) { 			 			NotePadTest.solo = new Solo(getInstrumentation());//, getActivity()); 			 		} 	} 	 	@Override 	public void tearDown() throws Exception { 		//Check whether it's the last case executed. 		run += countTestCases(); 		if(run >= NUMBER_TOTAL_CASES) { 			solo.finishOpenedActivities(); 		} 	}  	public void testAddNoteCNTitle() throws Exception { 		//getActivity(); 		Thread.sleep(5000); 		solo.clickOnMenuItem("Add note"); 		solo.enterText(0, "中文标签笔记"); 		solo.clickOnMenuItem("Save"); 		solo.clickInList(0); 		solo.clearEditText(0); 		solo.enterText(0, "Text 1"); 		solo.clickOnMenuItem("Save"); 		solo.assertCurrentActivity("Expected NotesList Activity", "NotesList"); 		 		solo.clickLongOnText("中文标签笔记"); 		solo.clickOnText("Delete"); 		 		 	} }

@Override     public MyActivity getActivity() {         if (mActivity == null) {             Intent intent = new Intent(getInstrumentation().getTargetContext(), MyActivity.class);             intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);             // register activity that need to be monitored.             monitor = getInstrumentation().addMonitor(MyActivity.class.getName(), null, false);             getInstrumentation().getTargetContext().startActivity(intent);             mActivity = (MyActivity) getInstrumentation().waitForMonitor(monitor);             setActivity(mActivity);         }         return mActivity;     }