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android解析xml文件又报java.lang.NullPointerException异常

2012-05-28 
android解析xml文件又报java.lang.NullPointerException错误package com.huawei.bizimport java.io.Input

android解析xml文件又报java.lang.NullPointerException错误
package com.huawei.biz;
import java.io.InputStream;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;

import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import com.huawei.entity.*;

import android.app.Activity;
import android.content.ContentValues;
import android.content.Context;
import android.net.Uri;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;


public class LoadXml extends Activity {
private final static String TAG="LoadXml";
public static Context context = null;
Document document = null;
NodeList childsNodes = null;
DocumentBuilderFactory factory = null;
DocumentBuilder builder = null;
InputStream inputStreams = null;
  @Override
  public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.main);
   
  Button button1=(Button)findViewById(R.id.button1);
  button1.setOnClickListener(button1OnClickListener);
  }
   
  OnClickListener button1OnClickListener=new OnClickListener(){
@Override
public void onClick(View v) {
Log.d(TAG, "onClick");
getComplateXml();

}
  };
  public void getComplateXml(){
  try {
  Log.d(TAG, "getComplateXml");
readUserConfig();
int j = 0;
for (int i = 0; i < childsNodes.getLength(); i++) {
Log.d(TAG, "1");
Node node = (Node) childsNodes.item(i);
Log.d(TAG, "2");
Uri insertUri = Uri.parse("content://com.huawei.biz.LoadContentProvider/STUDENTS");
Log.d(TAG, "3");
ContentValues values = new ContentValues();
Log.d(TAG, "4");
values.put("name", node.getNodeName());
Log.d(TAG, node.getNodeName());

values.put("id", node.getFirstChild().getNodeValue());
Log.d(TAG, node.getFirstChild().getNodeValue());

values.put("Photo",DataManager.getDrawableList().get(j));
Log.d(TAG, DataManager.getDrawableList().get(j).toString());

getContentResolver().insert(insertUri, values);
j++;
}
} catch (Exception e) {
e.printStackTrace();
}
 
  }
   
  private void readUserConfig() throws Exception{
  Log.d(TAG, "readUserConfig");
  factory = DocumentBuilderFactory.newInstance();
builder = factory.newDocumentBuilder();
inputStreams = getResources().getAssets().open("student.xml");
document = builder.parse(inputStreams);
 
childsNodes = document.getDocumentElement().getChildNodes();
}
}

这次是在Log.d(TAG, "4"); 的后面开始报错的。。
student.xml文件:
<?xml version="1.0" encoding="utf-8"?>
  <Students>
  <WangChen photo="">TB0904060</WangChen>
  <WangTing photo="">TB0904061</WangTing>
  <WangYa photo="">TB0904062</WangYa>
  <TaoJun photo="">TB0904063</TaoJun>
  <HanQi photo="">TB0904064</HanQi>
  <WangJInlong photo="">TB0904065</WangJInlong>
  <ZhangLing photo="">TB0904066</ZhangLing>


  <HuangHaibo photo="">TB0904067</HuangHaibo>
  <ShenQiang photo="">TB0904068</ShenQiang>
  <YuKuan photo="">TB0904069</YuKuan>
  <WangJiuCong photo="">TB0904070</WangJiuCong>
  <XiaTing photo="">TB0904071</XiaTing>
  <ZhangYang photo="">TB0904072</ZhangYang>
  <YaoShun photo="">TB0904073</YaoShun>
  </Students>




[解决办法]
for (int i = 0; i < childsNodes.getLength(); i++)


//下面应该都是i吧 ,怎么是j呢
values.put("Photo",DataManager.getDrawableList().get(j));
Log.d(TAG, DataManager.getDrawableList().get(j).toString());

getContentResolver().insert(insertUri, values);
j++;
[解决办法]

探讨
额。。不是。。。j是我在上面定义的。初始值=0.。是图片赋值的。。i++上面有的。。这个没什么关系的

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