Android / Robolectric 框架 - 实例化活动在 getResource 上返回 null

发布于 2024-10-28 11:35:55 字数 1553 浏览 0 评论 0原文

这与使用 Robolectric 框架在 Android 上进行单元测试有关。我在正常运行时没有问题的代码上遇到空指针异常。我刚刚开始使用机器人电动车，所以它可能非常简单。

这是测试的调用代码：

@Test
    public void testInitUtilsInitSequenceNumberIsRandom() {

    // create an activity for reference 
    InitUtils initUtils = new InitUtils();

    // do static initialization to parse questions into memory
    InitUtils.initialize(initUtils);  // <============ the call from roboelectric framework

    // retreive app state
    AppState appState = (AppState) initUtils.getApplicationContext();

    // fill in later
    fail("not implemented");

}

这是在 InitUtils 中调用的方法，该方法会崩溃

/** * 将 XML 加载到 {@see mQuestions} 类成员变量中 * */

   public static void initializeQuestions(Activity activity, AppState appState)                  {

    /* create XML Parser */
    XmlResourceParser questionBatch;      
    /* local question variable */
    Question question = null;

    /* retrieve the XML for parsing */
    // ===============   This returns null  ==============================  
   questionBatch = activity.getResources().getXml(R.xml.questions);

   /* Parse the XML */
   int eventType = -1;     
   /* iterate through XML */
   while (eventType != XmlResourceParser.END_DOCUMENT) {
       if (eventType == XmlResourceParser.START_TAG) {

         /* Get the questions */
         // ================================= NPE exception ====================== 
         String strName = questionBatch.getName();
         ...etc

我需要做一些特殊的事情来检索资源吗？

原文

This has to do with using the Robolectric framework for unit testing on android. I'm getting a null pointer exception on code which has no problem when running normally. I'm just starting on the roboelectric, so it's probably pretty simple.

Here is the calling code for Testing :

@Test
    public void testInitUtilsInitSequenceNumberIsRandom() {

    // create an activity for reference 
    InitUtils initUtils = new InitUtils();

    // do static initialization to parse questions into memory
    InitUtils.initialize(initUtils);  // <============ the call from roboelectric framework

    // retreive app state
    AppState appState = (AppState) initUtils.getApplicationContext();

    // fill in later
    fail("not implemented");

}

Here is the method called within in InitUtils which crashes

/**
* Loads the XML into the {@see mQuestions} class member variable
*
*/

   public static void initializeQuestions(Activity activity, AppState appState)                  {

    /* create XML Parser */
    XmlResourceParser questionBatch;      
    /* local question variable */
    Question question = null;

    /* retrieve the XML for parsing */
    // ===============   This returns null  ==============================  
   questionBatch = activity.getResources().getXml(R.xml.questions);

   /* Parse the XML */
   int eventType = -1;     
   /* iterate through XML */
   while (eventType != XmlResourceParser.END_DOCUMENT) {
       if (eventType == XmlResourceParser.START_TAG) {

         /* Get the questions */
         // ================================= NPE exception ====================== 
         String strName = questionBatch.getName();
         ...etc

Is there something special I need to do for this to retrieve the resource?

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誰ツ都不明白 2024-11-04 11:35:55

我对 Robolectric 的事情一无所知，但是 getResources() 返回 null 意味着它是在框架调用 Activity.onCreate() 之前被调用的。我不知道你从哪里得到这个 Activity，但如果你在 Instrumentation 之上进行单元测试，你需要确保你的 Instrumentation 线程阻塞，直到主线程完成执行，使用类似：

http://developer.android.com/reference/android/app/Instrumentation。 html#waitForIdleSync()

如果您使用 startActivitySync，这将为您完成：

http://developer.android.com/reference/android/app/Instrumentation.html#startActivitySync(android.content.Intent)

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