uiautomator 启动原理

首先启动的时候指定运行的类和方法

-c majcit.com.UIAutomatorDemo.SettingsSample#test001

开始提取你指定的类和方法

  public void addTestClasses(List<String> classNames)
    throws ClassNotFoundException
  {
     for (String className : classNames) {
      addTestClass(className);
    }
  }

如果有#号探测到，会调用addTestClass(String className, String methodName)，把method加入测试类

public void addTestClass(String className)
    throws ClassNotFoundException
   {
    int hashPos = className.indexOf('#');
    String methodName = null;
     if (hashPos != -1) {
       methodName = className.substring(hashPos + 1);
      className = className.substring(0, hashPos);
    }
    addTestClass(className, methodName);
  }

public void addTestClass(String className, String methodName)
    throws ClassNotFoundException
{
Class<?> clazz = this.mClassLoader.loadClass(className);
     if (methodName != null) {
     addSingleTestMethod(clazz, methodName);
    } else {
      Method[] methods = clazz.getMethods();
     for (Method method : methods) {
       if (this.mFilter.accept(method)) {
         addSingleTestMethod(clazz, method.getName());
       }
     }
   }
  }

看addSingleTestMethod是如何根据测试类clazz和它的一个方法创建一个junit.framework.TestCase对象的，

这些TestCase保存在TestCaseCollector对象的mTestCases这个列表里面。

这里千万要注意的一点是；并非一个测试脚本（类）一个TestCase，而是一个方法创建一个TestCase！

 protected void addSingleTestMethod(Class<?> clazz, String method) {
    if (!this.mFilter.accept(clazz)) {
       throw new RuntimeException("Test class must be derived from UiAutomatorTestCase");
    }
    try {
      TestCase testCase = (TestCase)clazz.newInstance();
     testCase.setName(method);
      this.mTestCases.add(testCase);
    } catch (InstantiationException e) {
     this.mTestCases.add(error(clazz, "InstantiationException: could not instantiate test class. Class: " + clazz.getName()));
   }
    catch (IllegalAccessException e) {
      this.mTestCases.add(error(clazz, "IllegalAccessException: could not instantiate test class. Class: " + clazz.getName()));
    }
  }

Junit运行

protected void start()
{
                ...
     for (TestCase testCase : testCases) {
       prepareTestCase(testCase);
       testCase.run(testRunResult);
       }
                ...
}

protected void runTest() throws Throwable {
        assertNotNull(fName); // Some VMs crash when calling getMethod(null,null);
        Method runMethod= null;
        try {
            // use getMethod to get all public inherited
            // methods. getDeclaredMethods returns all
            // methods of this class but excludes the
            // inherited ones.
            runMethod= getClass().getMethod(fName, (Class[])null);
        } catch (NoSuchMethodException e) {
            fail("Method ""+fName+"" not found");
        }
        if (!Modifier.isPublic(runMethod.getModifiers())) {
            fail("Method ""+fName+"" should be public");
        }

        try {
            runMethod.invoke(this, (Object[])new Class[0]);
        }
        catch (InvocationTargetException e) {
            e.fillInStackTrace();
            throw e.getTargetException();
        }
        catch (IllegalAccessException e) {
            e.fillInStackTrace();
            throw e;
        }
    }