Question

我正在编写一个Android应用程序并遇到一个非常奇怪的错误，我无法解决这个问题。在变量＆＃34;结果＆＃34;下面的代码中根据不同的条件填充值。然后它应该返回。在调试器中，可以看到结果的值已正确设置。但是当到达return语句时（此时结果根据调试器具有正确的值），该方法确实返回null而不是result中的值。我也尝试清理项目并在另一台机器上编译具有相同结果的代码。我无法想象这里出了什么问题，但在我看来，在编译过程中出现了问题。

我在Windows 10计算机上使用64位jdk1.7.0_79并在带有Android Studio版本1.3.1的Nexus 7（2012）仿真器上运行代码

非常感谢您的帮助。

 private static WikiItemContainer getMappingForIntermediateThrowEvent(IntermediateThrowEvent intermediateThrowEvent, List<WikiItemContainer> eventContainers) {
    WikiItemContainer result = null;
    List<EventDefinition> eventDefinitions = intermediateThrowEvent.getEventDefinitions();
    if (eventDefinitions.isEmpty()) {
        result = new WikiItemContainer(eventContainers.get(0).getItems().get(1));
    } else if (eventDefinitions.size() > 1) {
        result = new WikiItemContainer(eventContainers.get(10).getItems().get(6));
    } else {
        EventDefinition definition = eventDefinitions.get(0);
        if (definition instanceof MessageEventDefinition) {
            result = new WikiItemContainer(eventContainers.get(1).getItems().get(6));
        } else if (definition instanceof EscalationEventDefinition) {
            result = new WikiItemContainer(eventContainers.get(3).getItems().get(4));
        } else if (definition instanceof LinkEventDefinition) {
            result = new WikiItemContainer(eventContainers.get(5).getItems().get(1));
        } else if (definition instanceof CompensateEventDefinition) {
            result = new WikiItemContainer(eventContainers.get(8).getItems().get(2));
        } else if (definition instanceof SignalEventDefinition) {
            result = new WikiItemContainer(eventContainers.get(9).getItems().get(6));
        }
    }
    return result;
}

Answer 1

result为空的条件有一个：

 private static WikiItemContainer getMappingForIntermediateThrowEvent(IntermediateThrowEvent intermediateThrowEvent, List<WikiItemContainer> eventContainers) {
    WikiItemContainer result = null;
    List<EventDefinition> eventDefinitions = intermediateThrowEvent.getEventDefinitions();
    if (eventDefinitions.isEmpty()) {
        result = new WikiItemContainer(eventContainers.get(0).getItems().get(1));
    } else if (eventDefinitions.size() > 1) {
        result = new WikiItemContainer(eventContainers.get(10).getItems().get(6));
    } else {
        EventDefinition definition = eventDefinitions.get(0);
        if (definition instanceof MessageEventDefinition) {
            result = new WikiItemContainer(eventContainers.get(1).getItems().get(6));
        } else if (definition instanceof EscalationEventDefinition) {
            result = new WikiItemContainer(eventContainers.get(3).getItems().get(4));
        } else if (definition instanceof LinkEventDefinition) {
            result = new WikiItemContainer(eventContainers.get(5).getItems().get(1));
        } else if (definition instanceof CompensateEventDefinition) {
            result = new WikiItemContainer(eventContainers.get(8).getItems().get(2));
        } else if (definition instanceof SignalEventDefinition) {
            result = new WikiItemContainer(eventContainers.get(9).getItems().get(6));
        }


       // What value will result have here if none of the if statements above are entered?

    }
    return result;
}

Answer 2

您是否尝试过记录定义？尝试

too many connections

并记录eventDefinition列表的大小

Log.v("xxxx","definition:."+definition.getClass().Name());

返回语句返回null而不是给定值

2 个答案: