读取XML的问题-优快云博客

本文介绍了一个使用SAX解析器在Android应用中读取XML文件的实例，并展示了如何创建一个用于选择和查找特定章节的交互式界面。通过解析GuLan.xml文件，实现了对章节和节的选择，最终将结果展示在一个文本视图中。

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利用SAX读取写了代码，调试了一下午却一直在parse里抛异常。尼玛，Java的库函数还真心不怎么好用。

把代码贴上来先：

package com.example.gulanfinddemo;

import java.io.IOException;

import javax.xml.parsers.ParserConfigurationException;

import org.xml.sax.SAXException;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Spinner;

public class MainActivity extends Activity {

	private Spinner suraIDpinner;
	private QuranXmlParser quranXmlParser;
	
	final public static String ExtraStr = "FindRes";
	
	private static final String[] m={"1","2","3","4","5"}; 
	private ArrayAdapter<String> adapter; 
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		
		quranXmlParser = new QuranXmlParser();
		
		 Log.v("MainActivity", "1");
		 
		try {
			quranXmlParser.ReadXML("GuLan.xml");
		} catch (ParserConfigurationException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (SAXException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		
		InitSuraIDSpinner();
		
		suraIDpinner.setPrompt("请输入将要查询的章树");          
        
        //设置下拉列表的风格  
        adapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_dropdown_item,m);
          
        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); 
        
        //将adapter 添加到spinner中  
        suraIDpinner.setAdapter(adapter); 
        
	}

	
	public void InitSuraIDSpinner(){
		suraIDpinner = (Spinner)findViewById(R.id.SuraIDSpinner);
	}

	public void onClickSuraAyaFindBtn(View view){
		 Intent intent = new Intent(this, FindResActivity.class);
		 String selectedString = suraIDpinner.getSelectedItem().toString();
		 if(null==selectedString){
			 selectedString="NoThing";
		 }
		 intent.putExtra(ExtraStr, selectedString);
		 startActivity(intent);
	}
}

　　新建一个FindResActivity，显示结果：

package com.example.gulanfinddemo;

import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.widget.TextView;

public class FindResActivity extends Activity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_find_res);
		
		Intent intent = getIntent();
		String findReString = intent.getStringExtra(MainActivity.ExtraStr);
		
		TextView resText = (TextView)findViewById(R.id.ResText);
		resText.setText(findReString);
	}
	
}

　　一个QuranXmlParser类：

package com.example.gulanfinddemo;

import java.io.IOException;
import java.io.StringReader;
import java.util.HashMap;
import java.util.Map;

import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;

import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.XMLReader;
import org.xml.sax.helpers.DefaultHandler;

import android.util.Log;

public class QuranXmlParser{
private String m_res;
private volatile boolean m_isDoFind;

public QuranXmlParser(){
	m_isDoFind=false;
}

public boolean ReadXML(String xmlString) throws ParserConfigurationException, SAXException, IOException{
	Log.v("ReadXML", "1");
	
	XMLHandler handler = new XMLHandler();
	 
    SAXParserFactory factory = SAXParserFactory.newInstance();
    SAXParser parser = factory.newSAXParser();
    parser.parse(xmlString,handler);
    
    Log.v("ReadXML", "2");
	return true;
}

}

　　新建一个XMLHandler，负责具体的读取XML：

package com.example.gulanfinddemo;

import java.io.IOException;
import java.io.StringReader;
import java.util.HashMap;
import java.util.Map;
import java.util.jar.Attributes;

import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;

import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.XMLReader;
import org.xml.sax.helpers.DefaultHandler;

import android.R.integer;
import android.util.Log;
import android.util.Pair;

public class XMLHandler extends DefaultHandler{
	
	public static String tag = "XMLHandler";
	final int quran = 0;
    final int suraID = 1;
    final int suraName = 2;
    final int aya = 3;
    final int qurantext = 4;
    int currentState = 0;
    String suraIDString;
    String suraNameString;
    String ayaID;
    
    private HashMap<String, String> m_AyaContentMap;
    private Map<String, String> m_SuarIDSet;
    private HashMap<String, String> m_Id2IDsHashMap;
    
    public HashMap<String, String> getAyaContentMap(){
    	return m_AyaContentMap;
    }
    
    public Map<String, String> getSuarIDSet(){
    	return m_SuarIDSet;
    }
    
    public HashMap<String, String> getId2IDsHashMap(){
    	return m_Id2IDsHashMap;
    }

	public void startElement(String namespacesURI , String localName , String qName , Attributes atts) throws SAXException{
		 if(localName.equals("sura")){
			 if(qName.equals("suraID")){
				 currentState = suraID;
			 }
			 else if(qName.equals("suraName")){
				 currentState = suraName;
			 }			
		}
		 else if(localName.equals("aya")){
	        	currentState = aya;
	        }
		 else if (localName.equals("qurantext")){
	         currentState = qurantext;
	        }
		 else if(localName.equals("quran")){
			 currentState = quran;
	        }
	}

	public void endElement(String namespacesURI , String localName , String qName) throws SAXException{
		
	}

	public void characters(char[] ch , int start , int length)  throws SAXException{
        String theString = new String(ch, start, length);
        if(null != theString){
        	
        }
        switch(currentState){
        case suraID:{
        	suraIDString = theString;
        }
        break;  
        case suraName:{
        	suraNameString = theString;
        	m_SuarIDSet.put(suraIDString, suraNameString);
        }
        case aya:{
        	ayaID = theString;
        }
        	break;
        case qurantext:{
        	m_Id2IDsHashMap.put(suraIDString,ayaID);
        	
        	final String keyString = suraIDString+":"+ayaID;
        	m_AyaContentMap.put(keyString, theString);
        	
        	Log.v(tag,keyString+" "+theString);
        }
        	break;
        }
	}

}

　　然后主窗口布局：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >

 <TextView android:id="@+id/keywordLabel"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:text="关键字查询："
      android:paddingTop="15px" 
      />
    
 <EditText android:id="@+id/keywordEditText"
      android:layout_width="fill_parent"
      android:layout_height="wrap_content"
      android:layout_toRightOf="@id/keywordLabel"
      android:layout_alignBaseline="@id/keywordLabel"
       />
    
<Button android:id="@+id/findKeywordButton"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_below="@id/keywordEditText"
      android:layout_alignRight="@id/keywordEditText"
      android:text="查找"
       />
    
 <TextView android:id="@+id/ChapterTextView"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:text="章节查询:"
      android:layout_below="@id/findKeywordButton"
      android:paddingTop="15px" />
    
 <TextView android:id="@+id/SuraIDText"
     android:text="章："
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_below="@id/ChapterTextView"
       />
    
 <Spinner
     android:id="@+id/SuraIDSpinner"
     android:layout_width="fill_parent"
     android:layout_height="wrap_content"
     android:layout_below="@id/SuraIDText"
     android:paddingTop="15px" />
    
 <TextView android:id="@+id/AyaIDText"
     android:text="节："
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_below="@id/SuraIDSpinner"
       />
 
 <Spinner android:id="@+id/AyaIDSpinner"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/AyaIDText"
        />
 
 <Button android:id="@+id/findChapterButton"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_below="@id/AyaIDSpinner"
      android:layout_alignRight="@id/AyaIDSpinner"
      android:text="查找"
      android:onClick="onClickSuraAyaFindBtn"
       />
</RelativeLayout>

　　显示结果窗口布局：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:orientation="vertical"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".FindResActivity" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/FindResShow" />

    <TextView android:id="@+id/ResText"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />
    
</LinearLayout>

　主窗口显示：