Robotium编写测试用例如何模拟Junit4的BeforeC

Robotium的测试类ActivityInstrumentationTestCase2是继承于Junit3的TestCase类，所以并没有提供Junit4的特性.如网上总结说的

不能通过annotate的方式来识别子类的新特征，如不能实现@beforeclass，@afterclass等特征。只能通过写setup和teardown，
TestCase只能以test开头进行测试case书写。

那么有时我们并不想每次开始/完成一个case的时候都做一些重复的动作，也就是要实现Junit4的@beforeclass和@afterclass，该怎么办呢？
以SDK自带的Notepad测试用例作为例子，假如现在我们需要实现两个测试用例
testAddNoteCNTittle:创建一个中文标题的笔记
testAddNoteEngTitle:创建一个英文标题的笔记

根据实例提供的代码，在setup里面会初始化solo而在teardown里面会关闭所有打开的activities，也就是说每执行一个case都会重新初始化一次solo和关闭所有的activities：

@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();

this.activity = this.getActivity();  

this.solo = new Solo(getInstrumentation(), getActivity());  

}

@Override
public void tearDown() throws Exception {
//tearDown() is run after a test case has finished.
//finishOpenedActivities() will finish all the activities that have been opened during the test execution.
solo.finishOpenedActivities();
}

@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(); this.activity = this.getActivity(); this.solo = new Solo(getInstrumentation(), getActivity()); } @Override public void tearDown() throws Exception { //tearDown() is run after a test case has finished. //finishOpenedActivities() will finish all the activities that have been opened during the test execution. solo.finishOpenedActivities(); }
但事实上我们在这个脚本只是去创建两个Note，并不需要每执行完一个case都要去初始化solo和关闭所有activities。google后没有发现有现成的取代@beforeclass和@aferclass的方法。
以下本人的实现方法
<pre name="code" class="java">package com.example.android.notepad.test;

import com.robotium.solo.Solo;

import android.test.ActivityInstrumentationTestCase2;
import android.app.Activity;

@SuppressWarnings("rawtypes")
public class TCCreateNote extends ActivityInstrumentationTestCase2{

private static Solo solo = null;  
public Activity activity;  

<span style="white-space:pre"> </span>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 TCCreateNote() {  
    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();   

<span style="white-space:pre"> </span>//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) {
TCCreateNote.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 {  
      
    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");  
}  
  
  
public void testAddNoteEngTitle() throws Exception {  
    solo.clickOnMenuItem("Add note");  
    solo.enterText(0, "English Title Note");  
    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("English Title Note");  
    solo.clickOnText("Delete");  
}  

}