将静态数据存储在Android-自定义资源中？

Question

我是Android开发的新手，而且我一直在玩它。我试图创建一个程序，该程序具有一个类似于数据库的小数据库的收藏。在我当前最好的语言C＃中，我将使用自定义类的列表并将其序列化到XML文件，然后在运行时将其阅读到我的应用程序中。我在Android中找到了 /XML资源文件夹，但是我不确定如何做自己想象的事情。这样做的最好方法是什么？

数据将永远不需要更改。例子：

Blob   | A  | B
----------------
Blob 1 | 23 | 42
Blob 2 | 34 | 21

我知道这是像表一样布置的，但是使用数据库对我来说并没有任何意义，因为数据永远不会更改，我需要一种存储它的方法才能最初填充数据库 反正.

因此，基本上，我正在寻找一种在我的应用程序中存储一些复杂数据的方法。有任何想法吗？

编辑：我还看到了 /原始文件夹。因此，我可以将物品存储在 /res /raw或 /res /xml中。但是我不确定是存储/解析数据的最佳方法是什么？

Answer 1

最好的方法是使用 Android Resource Heirarchy.

在RES/值/目录中，您可以为几种基本数据类型存储任意数量的键值对。在您的应用程序中，您将使用自动化资源ID（基于资源的密钥的名称）参考它们。有关更多文档和详细信息，请参见上面的链接。

Android还支持原始数据文件。您可以将数据存储在res/raw/yourfile.dat下的文件目录中

您以任何需要的基于文本的格式创建数据，然后使用资源访问API在活动启动上阅读它。

Answer 2

我认为这是最好的解决方案，我已经在使用此项目将静态数据存储在我的每个项目中。

为此...您可以做一件事，制作一个XML文件，即“ temp.xml” ..并将数据存储在temp.xml中：

  <?xml version="1.0" encoding="utf-8"?> 
<rootelement1>

    <subelement> Blob 1  
     <subsubelement> 23 </subsubelement>
     <subsubelement> 42 </subsubelement> 
    </subelement>

    <subelement>Blob 2      
    <subsubelement> 34 </subsubelement>
    <subsubelement> 21 </subsubelement>
    </subelement>


    </rootelement1>

然后使用 XML Pullparser 解析数据的技术。您可以在上面有plapparsing技术的编码样品 例子 , ，请参阅此示例以获取更好的想法。

享受！！

Answer 3

我过去曾经用简单的XML解析。我认为，如果您知道在XML中会发生什么，那么它的代码数量最少，在您的情况下。

http://simple.sourceforge.net/

Answer 4

根据 Doc, /xml 是要走的路。

提供资源

xml/ 可以通过调用可以在运行时读取的任意XML文件

Resources.getXML().

必须在此处保存各种XML配置文件，例如可搜索的配置。

文件 getXML()

我还做了一个工作示例：

• XML结构：

  <?xml version="1.0" encoding="utf-8"?>
  <quizquestions>
      <quizquestion>
          <header_image_src>ic_help_black_24dp</header_image_src>
          <question>What is the Capital of U.S.A.?</question>
          <input_type>Radio</input_type>
          <answer correct="false">New York City</answer>
          <answer correct="true">Washington D.C.</answer>
          <answer correct="false">Chicago</answer>
          <answer correct="false">Philadelphia</answer>
      </quizquestion>
  
      <quizquestion>
          <header_image_src>ic_help_black_24dp</header_image_src>
          <question>What is the family name of the famous dutch painter Vincent Willem van .... ?</question>
          <input_type>EditText</input_type>              
          <answer correct="true">Gogh</answer>
      </quizquestion>
  </quizquestions>
  

• Java类保存数据：

  public class QuizQuestion {
      private int headerImageResId;
      private String question;
      private String inputType;
      private ArrayList<String> answers;
      private ArrayList<Boolean> answerIsCorrect;
      private ArrayList<Integer> correctAnswerIndexes;
  
      /**
       * constructor for QuizQuestion object
       */
      QuizQuestion() {
          headerImageResId = 0;
          question = null;
          inputType = null;
          answers = new ArrayList<>();
          answerIsCorrect = new ArrayList<>();
          correctAnswerIndexes = new ArrayList<>();
      }
  
  
      public void setHeaderImageResId(int headerImageResId) {
          this.headerImageResId = headerImageResId;
      }
  
      public int getHeaderImageResId() {
          return headerImageResId;
      }
  
  
      void setQuestion(String question) {
          this.question = question;
      }
  
      public String getQuestion() {
          return question;
      }
  
  
      void setInputType(String inputType) {
          this.inputType = inputType;
      }
  
      public String getInputType() {
          return inputType;
      }
  
      void addAnswer(String answer, boolean isCorrect)
      {
          if (isCorrect)
              correctAnswerIndexes.add(answers.size());
          answers.add(answer);
          answerIsCorrect.add(isCorrect);
      }
  
  
      public ArrayList<String> getAnswers() {
          return answers;
      }
  
      public String getAnswer(int index)
      {
          // check index to avoid out of bounds exception
          if (index < answers.size()) {
              return answers.get(index);
          }
          else
          {
              return null;
          }
      }
  
      public int size()
      {
          return answers.size();
      }
  
  }
  

• 解析器本身：

  /**
   * Created by bivanbi on 2017.02.23..
   *
   * class to parse xml resource containing quiz data into ArrayList of QuizQuestion objects
   *
   */
  
  public class QuizXmlParser {
  
      public static String lastErrorMessage = "";
  
      /**
       * static method to parse XML data into ArrayList of QuizQuestion objects
       * @param activity is the calling activity
       * @param xmlResourceId is the resource id of XML resource to be parsed
       * @return null if parse error is occurred or ArrayList of objects if successful
       * @throws XmlPullParserException
       * @throws IOException
       */
      public static ArrayList<QuizQuestion> parse(Activity activity, int xmlResourceId)
              throws XmlPullParserException, IOException
      {
          String logTag = QuizXmlParser.class.getSimpleName();
          Resources res = activity.getResources();
          XmlResourceParser quizDataXmlParser = res.getXml(R.xml.quiz_data);
  
          ArrayList<String> xmlTagStack = new ArrayList<>();
          ArrayList<QuizQuestion> quizQuestions = new ArrayList<>();
  
          QuizQuestion currentQuestion = null;
  
          boolean isCurrentAnswerCorrect = false;
  
          quizDataXmlParser.next();
          int eventType = quizDataXmlParser.getEventType();
          while (eventType != XmlPullParser.END_DOCUMENT)
          {
              //  begin document
              if(eventType == XmlPullParser.START_DOCUMENT)
              {
                  Log.d(logTag,"Begin Document");
              }
              //  begin tag
              else if(eventType == XmlPullParser.START_TAG)
              {
                  String tagName = quizDataXmlParser.getName();
                  xmlTagStack.add(tagName);
                  Log.d(logTag,"Begin Tag "+tagName+", depth: "+xmlTagStack.size());
                  Log.d(logTag,"Tag "+tagName+" has "+quizDataXmlParser.getAttributeCount()+" attribute(s)");
  
                  // this is a beginning of a quiz question tag so create a new QuizQuestion object
                  if (tagName.equals("quizquestion")){
                      currentQuestion = new QuizQuestion();
                  }
                  else if(tagName.equals("answer"))
                  {
                      isCurrentAnswerCorrect = quizDataXmlParser.getAttributeBooleanValue(null,"correct",false);
                      if (isCurrentAnswerCorrect == true) {
                          Log.d(logTag, "Tag " + tagName + " has attribute correct = true");
                      }
                      else
                      {
                          Log.d(logTag, "Tag " + tagName + " has attribute correct = false");
                      }
                  }
              }
              //  end tag
              else if(eventType == XmlPullParser.END_TAG)
              {
                  String tagName = quizDataXmlParser.getName();
                  if (xmlTagStack.size() < 1)
                  {
                      lastErrorMessage = "Error 101: encountered END_TAG "+quizDataXmlParser.getName()+" while TagStack is empty";
                      Log.e(logTag, lastErrorMessage);
                      return null;
                  }
                  xmlTagStack.remove(xmlTagStack.size()-1);
                  Log.d(logTag,"End Tag "+quizDataXmlParser.getName()+", depth: "+xmlTagStack.size());
  
                  //  reached the end of a quizquestion definition, add it to the array
                  if (tagName.equals("quizquestion")){
                      if (currentQuestion != null)
                          quizQuestions.add(currentQuestion);
                      currentQuestion = null;
                  }
              }
              //  text between tag begin and end
              else if(eventType == XmlPullParser.TEXT)
              {
                  String currentTag = xmlTagStack.get(xmlTagStack.size()-1);
                  String text = quizDataXmlParser.getText();
                  Log.d(logTag,"Text: "+text+", current tag: "+currentTag+", depth: "+xmlTagStack.size());
  
                  if (currentQuestion == null) {
                      Log.e(logTag,"currentQuestion is not initialized! text: "+text+", current tag: "+currentTag+", depth: "+xmlTagStack.size());
                      continue;
                  }
  
                  if (currentTag.equals("header_image_src"))
                  {
                      int drawableResourceId = activity.getResources().getIdentifier(text, "drawable", activity.getPackageName());
                      currentQuestion.setHeaderImageResId(drawableResourceId);
                  }
                  else if (currentTag.equals("question"))
                  {
                      currentQuestion.setQuestion(text);
                  }
                  else if (currentTag.equals("answer"))
                  {
                      currentQuestion.addAnswer(text, isCurrentAnswerCorrect);
                  }
                  else if (currentTag.equals("input_type"))
                  {
                      currentQuestion.setInputType(text);
                  }
                  else
                  {
                      Log.e(logTag,"Unexpected tag "+currentTag+" with text: "+text+", depth: "+xmlTagStack.size());
                  }
              }
              eventType = quizDataXmlParser.next();
          }
          Log.d(logTag,"End Document");
          return quizQuestions;
      }
  
  }
  

• 最后，称解析器：

  //  read quiz data from xml resource quiz_data
  try {
      quizQuestions = QuizXmlParser.parse(this,R.xml.quiz_data);
      Log.d("Main","QuizQuestions: "+quizQuestions);
  
  } catch (XmlPullParserException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
      quizQuestions = null;
  } catch (IOException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
      quizQuestions = null;
  }
  
  if (quizQuestions == null)
  {
      Toast.makeText(this,"1001 Failed to parse Quiz XML, sorry", Toast.LENGTH_LONG).show();
      finish();
  }