如果给出超过3个字的话，Android文本函数forceclose

Question

即时消息来自C++的java新手，并且快速学习将chatbot转换为java android应用程序的不同实践。这个功能在这里强制关闭，如果它超过3个不同的单词，我不知道为什么。如果有人能帮我打败这个谜语，我会很高兴！

public void AI(String text) { 
// initiate new lists to be on the safe side 
List<String> indexer = new ArrayList<String>(); 
List<String> sentence = new ArrayList<String>(); 
List<String> explode = new ArrayList<String>(); 
List<String> ary = new ArrayList<String>(); 

explode = Arrays.asList(text.split(" ")); 

// initiate randint and trigger variable 
Random rand = new Random(); 
int randint = rand.nextInt(explode.size()); 

// initiate the trigger variable 
String trigger = explode.get(randint); 


    // check if word exists in database and add if it not. 
for(int i = 0; i < explode.size(); i++) { 
    String word = explode.get(i); 

if(common.get(word)==null) { 
         words.add(word); 
         common.put(word, 1); 
         context.put(word, explode); 
         pos.put(word, i); 
         length.put(word, explode.size()); 

         }else{ 
     // increase the weight of common if the word repeats 
         common.put(word, common.get(word)+1); 
            } 
            } 
    //check if context with index set as trigger is empty, if not, copy the arraylist to the ary variable 
    if(!context.get(trigger).isEmpty()) { 
      Collections.copy(ary, context.get(trigger));} 


    // fill the arraylist sentence with words to be used, some in context, some random from the database. 
for(int i2 = 0; i2 < length.get(trigger); i2++) { 

        randint = rand.nextInt(length.get(trigger)); 

if(randint < length.get(trigger)/2) { 
             // 
             if(ary.get(i2)!=null) { 
                    sentence.add(ary.get(i2)); 
                   } 
            }else{ 
         sentence.add(words.get(rand.nextInt(words.size()))); 
             } 

}  

    // use to the pos-hashmap to check at which index the word was detected at, if not  place it at the deliberate index. 
for(int i3 = 0; i3 < sentence.size(); i3++) { 
              if(sentence.get(i3)!=null) {  
              indexer.add(pos.get(sentence.get(i3)), sentence.get(i3)); 
                     } 
              } 

// compose the final string that is to be passed to the speak function 
for(int i4 = 0; i4 < indexer.size(); i4++) { 
say = say + indexer.get(i4)+" ";  
    } 

// pass the string to the speak function 
mTts.speak(say, TextToSpeech.QUEUE_FLUSH, null);  


// removing final string to be ready for next iteration 
    say = ""; 



// end of AI stuff   
}  

的logcat：

05-26 17:40:08.266: E/AndroidRuntime(490): Uncaught handler: thread main exiting due to uncaught exception 
05-26 17:40:08.276: E/AndroidRuntime(490): java.lang.ArrayIndexOutOfBoundsException 
05-26 17:40:08.276: E/AndroidRuntime(490): at java.util.Collections.copy(Collections.java:1593) 
05-26 17:40:08.276: E/AndroidRuntime(490): at sarah.namespace.SarahActivity.AI(SarahActivity.java:163) 

变量：

// arraylists 
public List<String> explode = new ArrayList<String>(); 
    public List<String> words = new ArrayList<String>(); 
    public List<String> sentence = new ArrayList<String>(); 
    public List<String> indexer = new ArrayList<String>(); 
// hashmaps 
    public Map<String, Integer> common = new HashMap<String, Integer>(); 
public Map<String, List<String>> context = new HashMap<String, List<String>>(); 
public Map<String, Integer> pos = new HashMap<String, Integer>(); 
public Map<String, Integer> length = new HashMap<String, Integer>(); 

// strings 
public String say; 

logcat中所指向的行：

if(!context.get(trigger).isEmpty()) { 
      Collections.copy(ary, context.get(trigger));} 

Answer 1

我还没有准确定位的问题，但我相信这种替代方法更快，应该躲开它。 （说实话，你的代码崩溃的第四个单词这只是奇怪，我相信还有更多的吧...反正？）

在Java for-each loops是更快，更简单，所以：

// check if word exists in database and add if it not. 
int i = 0; 
for(String word : explode) { 
    if(common.get(word) == null) { 
     if(word.equals(trigger)) { 
      ary = new ArrayList<String>(explode); 
     } 

    ... 
    i++; 
} 

此外，如果trigger不context然后空存在，返回，不是一个空洞的列表，所以你也许可以做一个简单的变化：

if(context.get(trigger) != null && !context.get(trigger).isEmpty()) { 
    Collections.copy(ary, context.get(trigger)); 
} 

但这应该抛出NullPointerException不是一个出界的。我还是不知道为什么第四个词是致命的。希望这可以帮助。