java - 调试 HashMap - Java Android

Question

基本上它是一个 Android 应用程序，用户完成了一些心理健康日志，就像乳制品一样。其中一个屏幕让用户从“12种扭曲思维”中进行选择。用户可以进行多项选择。这12种类型存储在mysql数据库中，主键为1-12。这就是背景故事。

上面的代码来自一个允许用户查看其日志的类。当他们打开日志时，它会从 mysql 服务器提取数据并将其显示在 android 内的 textView 中。如果用户选择了前 3 种扭曲思维，那么数据库将返回 1、2、3、null、null、null、null...等等，最多 12。所以我得到的数据集看起来像这样。然后，我将这些数字 1、2、3 分配给 java 类中扭曲思维变量的名称。这镜像了数据库。 1 = 全有或全无，2 = 指责他人......等等，最多 12 = 应该陈述。

下面的代码有效。然而，它每次都会向列表中添加一个额外的选择。例如。如果用户只做出一项选择 - 说“allOrNothing”。它将“全部或无”打印到 TextView ，但它还会添加“Should statements”。如果用户选择“全有或全无”和“应该陈述”，它将在列表中添加“自责”。我不知道这个幻象选择是从哪里来的，也不知道为什么。有人可以检查下面的代码并帮助我查明它。

Integer[] twistedThinking = {allOrNothing, blamingOthers,  catastrophizing, 
emotionalReasoning, fortuneTelling,labelling, magnifying, mindReading, 
minimising, overGeneralisation, selfBlaming, shouldStatements};

 Map<Integer, String> twistedThoughtsMap = new HashMap<>(); 
 twistedThoughtsMap.put(allOrNothing, "All or Nothing Thinking"); 
 twistedThoughtsMap.put(blamingOthers, "Blaming Others"); 
 twistedThoughtsMap.put(catastrophizing, "Catastrophizing"); 
 twistedThoughtsMap.put(emotionalReasoning, "Emotional Reasoning"); 
 twistedThoughtsMap.put(fortuneTelling, "Fortune Telling"); 
 twistedThoughtsMap.put(labelling, "Labelling"); 
 twistedThoughtsMap.put(magnifying, "Magnifying the Negative"); 
 twistedThoughtsMap.put(mindReading, "Mind Reading"); 
 twistedThoughtsMap.put(minimising, "Minimising the Positive"); 
 twistedThoughtsMap.put(overGeneralisation, "Over Generalisation"); 
 twistedThoughtsMap.put(selfBlaming, "Self-Blaming"); 
 twistedThoughtsMap.put(shouldStatements, "Should Statements");

 Set<Integer> selectedSet = new HashSet<>(); for (Integer keys :   twistedThinking) {
 if (twistedThinking != null) {
    selectedSet.add(keys);
 } }
 StringBuilder selectedThoughtsSB = new StringBuilder();
 for(Integer key : selectedSet) {

 selectedThoughtsSB.append(twistedThoughtsMap.get(key) + "\n");
 } distortionLogDetails.setText(selectedThoughtsSB.toString());
 }

这是从mysql服务器返回到Android的数据示例。

"allOrNothing": null, 
"blamingOthers": null, 
"catastrophizing": null, 
"emotionalReasoning": null, 
"fortuneTelling": "5", 
"labelling": null, 
"magnifyingTheNegative": "7", 
"mindReading": "8", 
"minimisingThePositive": "9", 
"overGeneralisation": null, 
"selfBlaming": null, 
"shouldStatements": null

Answer 1

您应该检查keys != null，而不是twistedThinking != null。您获得的额外 HashMap 值用于键 null。下面的代码应该可以工作。

Integer[] twistedThinking = {allOrNothing, blamingOthers,  catastrophizing, 
emotionalReasoning, fortuneTelling,labelling, magnifying, mindReading, 
minimising, overGeneralisation, selfBlaming, shouldStatements};

 Map<Integer, String> twistedThoughtsMap = new HashMap<>(); 
 twistedThoughtsMap.put(allOrNothing, "All or Nothing Thinking"); 
 twistedThoughtsMap.put(blamingOthers, "Blaming Others"); 
 twistedThoughtsMap.put(catastrophizing, "Catastrophizing"); 
 twistedThoughtsMap.put(emotionalReasoning, "Emotional Reasoning"); 
 twistedThoughtsMap.put(fortuneTelling, "Fortune Telling"); 
 twistedThoughtsMap.put(labelling, "Labelling"); 
 twistedThoughtsMap.put(magnifying, "Magnifying the Negative"); 
 twistedThoughtsMap.put(mindReading, "Mind Reading"); 
 twistedThoughtsMap.put(minimising, "Minimising the Positive"); 
 twistedThoughtsMap.put(overGeneralisation, "Over Generalisation"); 
 twistedThoughtsMap.put(selfBlaming, "Self-Blaming"); 
 twistedThoughtsMap.put(shouldStatements, "Should Statements");

 Set<Integer> selectedSet = new HashSet<>();
 for (Integer keys :   twistedThinking) {
 if (keys != null) {
    selectedSet.add(keys);
 } }
 StringBuilder selectedThoughtsSB = new StringBuilder();
 for(Integer key : selectedSet) {

 selectedThoughtsSB.append(twistedThoughtsMap.get(key) + "\n");
 } distortionLogDetails.setText(selectedThoughtsSB.toString());
 }