数据库显示错误

Question

package com.pack.epubreader; 

/*所有进口*/

公共抽象类EpubWebView延伸web视图{ 私人最终静态浮动FLING_THRESHOLD_VELOCITY = 200;

/* 
* The book view will show 
*/ 
public static SQLiteDatabase db; 
DatabaseManipulation dbManipulation = new DatabaseManipulation(); 
//MainActivity lastChapterAddress= new MainActivity(); 
MySQLiteHelper dbManager; 

private Book mBook; 


String lastPage; 

private GestureDetector mGestureDetector; 

/* 
* "root" page we're currently showing 
*/ 
private Uri mCurrentResourceUri, extraUri, extraUri_start, extraUri_lastPos,extraUri_chapter ; 

/* 
* Position of document 
*/ 
private float mScrollY = 0.0f; 

public String sentFilename=null; 

/* 
* Note that we're loading from a bookmark 
*/ 
private boolean mScrollWhenPageLoaded = false; 

/* 
* To speak the text 
*/ 
private TextToSpeechWrapper mTtsWrapper; 

/* 
* The page, as text 
*/ 
private ArrayList<String> mText; 

private WebViewClient mWebViewClient; 

/* 
* Current line being spoken 
*/ 
private int mTextLine; 

/* 
* Pick an initial default 
*/ 
private float mFlingMinDistance = 320; 

public EpubWebView(Context context) { 
    this(context, null); 
} 

public EpubWebView(Context context, AttributeSet attrs) { 
    super(context, attrs); 
    mGestureDetector = new GestureDetector(context, mGestureListener); 
    WebSettings settings = getSettings(); 
    settings.setCacheMode(WebSettings.LOAD_NO_CACHE);   
    setWebViewClient(mWebViewClient = createWebViewClient()); 
} 

/* 
* @ return Android version appropriate WebViewClient 
*/ 
abstract protected WebViewClient createWebViewClient(); 

public void testDataURL(AssetManager assetManager) { 
    setBook(Environment.getExternalStorageDirectory().getPath()); 

    // String resourceName = "content/calibre_title_page.html"; 
    // String resourceName = "content/074349881X__p__split_0.html"; 
    // gingerbreadLoadUrl(Book.resourceName2Url(resourceName)); 

    loadChapter(null); 
} 


/* 
* Book to show 
*/ 
public void setBook(String fileName) { 
    //String Count=Intent.getExtra 
    System.out.println(fileName+" book going to load"); 
    sentFilename=fileName; 

    // if book already loaded, don't load again 
    if ((mBook == null) || !mBook.getFileName().equals(fileName)) { 
     mBook = new Book(fileName); 
    } 
} 






public Book getBook() { 
    return mBook; 
} 

protected WebViewClient getWebViewClient() { 
    return mWebViewClient; 
} 

/* 
* Chapter of book to show 
*/ 
public void loadChapter(Uri resourceUri) 
{ 
    if (mBook != null) 
    { 
     // if no chapter resourceName supplied, default to first one. 
     if (resourceUri == null) 
     { 

      resourceUri = mBook.firstChapter(); 
      extraUri=resourceUri; 
      extraUri_start=resourceUri; 
      String extra_uriStart=extraUri.toString(); 
      //String extraUri_start_str=resourceUri.toString(); 

      //dbManipulation.updatingBookdetails(sentFilename, extraUri_start); 
      //lastChapterAddress.findLastAddress(extraUri_start, sentFilename); 
      System.out.println(sentFilename+" name of book going to load first"); 
      System.out.println(extraUri_start+" address of book going to load first"); 

      //db = openOrCreateDatabase("epub.db", EpubWebView.this.MODE_PRIVATE,null); error here 
      //db = openOrCreateDatabase("epub.db", SQLiteDatabase.CREATE_IF_NECESSARY, null);// and here 
      try 
      { 



      System.out.println("BLOW FILE111"); 
      db.setLocale(Locale.getDefault()); 
      db.setLockingEnabled(true); 
      db.setVersion(1); 


      System.out.println("BLOW FILE222"); 

      ContentValues val=new ContentValues(); 
      val.put("bookpath",fileName); 
      val.put("lastchapter", strAddress); 
      db.update("Bookdetails", val, "bookpath="+fileName, null); 
      System.out.println("BLOW FILE333"); 
      } 
      catch(Exception e) 
      { 
       System.out.println(e+" errors happens"); 
      } 
      finally 
      { 
       db.close(); 
      } 


      //dbManager.updateBook(sentFilename, extra_uriStart); 




      System.out.println(sentFilename+" name of book going to load"); 
      //(extraUri_start); 

      System.out.println(resourceUri+" actual Uri from top"); 
      String resuristr = resourceUri.toString(); 
      System.out.println(resuristr+" actual string from top"); 
     } 
     if (resourceUri != null) 
     { 
      if(extraUri==null) 
      { 
       extraUri=resourceUri; 
      } 
      String extraUristr=extraUri.toString(); 
      //extraUristr=extraUristr.substring(extraUristr.lastIndexOf("/") + 1); 
      //extraUristr= extraUristr.substring(8); 
      int p=extraUristr.lastIndexOf("/"); 
      extraUristr=extraUristr.substring(0,p); 
      System.out.println(extraUristr+" cutted string_1"); 

      String extraUri2=resourceUri.toString(); 
      int q=extraUri2.lastIndexOf("/"); 
      extraUri2=extraUri2.substring(q); 
      extraUri2=extraUristr+extraUri2; 
      System.out.println(extraUri2+" Joined Uri string_2"); 

      Uri myUri = Uri.parse(extraUri2); 
      System.out.println(myUri+"--> Joined Uri "); 
      resourceUri= myUri; 
      System.out.println(resourceUri+"actual string"); 
      mCurrentResourceUri = resourceUri; 
      // prevent cache, because WebSettings.LOAD_NO_CACHE doesn't always work. 
      clearCache(false); 
      LoadUri(resourceUri); 
     } 
    } 
} 

/* 
* @ return load contents of URI into WebView, 
* implementation is android version dependent 
*/ 
protected abstract void LoadUri(Uri uri); 

@Override 
public boolean onTouchEvent(MotionEvent event) { 
    return mGestureDetector.onTouchEvent(event) || 
     super.onTouchEvent(event); 
} 

GestureDetector.SimpleOnGestureListener mGestureListener = new GestureDetector.SimpleOnGestureListener() { 
    @Override 
    public boolean onFling(MotionEvent event1, MotionEvent event2, float velocityX, float velocityY) { 
     // if no book, nothing to do 
     if (mBook == null) { 
      return false; 
     } 

     // also ignore swipes that are vertical, too slow, or too short. 
     float deltaX = event2.getX() - event1.getX(); 
     float deltaY = event2.getY() - event1.getY(); 

     if ((Math.abs(deltaX) < Math.abs(deltaY)) 
       || (Math.abs(deltaX) < mFlingMinDistance) 
       || (Math.abs(velocityX) < FLING_THRESHOLD_VELOCITY)) { 
      return false; 
     } else { 
      if (deltaX < 0) { 
       return changeChapter(mBook.nextResource(mCurrentResourceUri)); 
      } else { 
       return changeChapter(mBook.previousResource(mCurrentResourceUri)); 
      } 
     } 
    } 
}; 

private boolean changeChapter(Uri resourceUri) { 
    if (resourceUri != null) { 
     loadChapter(resourceUri); 
     System.out.println(resourceUri+ " next chapter uri"); 
     return true; 
    } else { 
     Utility.showToast(getContext(), R.string.end_of_book); 
     return false; 
    } 
} 



/* 
* Store current view into bookmark 
*/ 
public Bookmark getBookmark() { 
    if ((mBook != null) && (mCurrentResourceUri != null)) { 
     float contentHeight = (float)getContentHeight(); 
     contentHeight = (contentHeight == 0.0f) ? 0.0f : getScrollY()/contentHeight; 
     return new Bookmark (
      mBook.getFileName(), 
      mCurrentResourceUri, 
      contentHeight 
     ); 
    } 
    return null; 
} 

public void gotoBookmark(Bookmark bookmark) { 
    if (!bookmark.isEmpty()) { 
     mScrollY = bookmark.mScrollY; 

     // get notify when content height is available, for setting Y scroll position 
     mScrollWhenPageLoaded = true; 
     setBook(bookmark.getFileName()); 
     loadChapter(bookmark.getResourceUri()); 
    } 
} 

public void speak(TextToSpeechWrapper ttsWrapper) { 
    mTtsWrapper = ttsWrapper; 
    if ((mBook != null) && (mCurrentResourceUri != null)) { 
     mText = new ArrayList<String>(); 
     XmlUtil.parseXmlResource(
       mBook.fetch(mCurrentResourceUri).getData(), 
       new XhtmlToText(mText), null); 
     mTextLine = 0; 
     mTtsWrapper.setOnUtteranceCompletedListener(mCompletedListener); 
     if (0 < mText.size()) { 
      mTtsWrapper.speak(mText.get(0)); 
     } 
    } 
} 

/* 
* Send next piece of text to Text to speech 
*/ 
private TextToSpeech.OnUtteranceCompletedListener mCompletedListener = 
     new TextToSpeech.OnUtteranceCompletedListener() { 

    @Override 
    public void onUtteranceCompleted(String utteranceId) { 
     if (mTextLine < mText.size() - 1) { 
      mTtsWrapper.speak(mText.get(++mTextLine)); 
     } 
    } 

}; 

@Override 
protected void onSizeChanged(int w, int h, int oldw, int oldh) { 
    super.onSizeChanged(w, h, oldw, oldh); 
    mFlingMinDistance = w/2; 
} 

/* 
* Called when page is loaded, 
* if we're scrolling to a bookmark, we need to set the 
* page size listener here. Otherwise it can be called 
* for pages other than the one we're interested in 
*/ 
@SuppressWarnings("deprecation") 
protected void onPageLoaded() { 
    if (mScrollWhenPageLoaded) { 
     setPictureListener(mPictureListener); 
     mScrollWhenPageLoaded = false; 
    } 
} 

/* 
* Need to wait until view has figured out how big web page is 
* Otherwise, we can't scroll to last position because 
* getContentHeight() returns 0. 
* At current time, there is no replacement for PictureListener 
*/ 
@SuppressWarnings("deprecation") 
private PictureListener mPictureListener = new PictureListener() { 
    @Override 
    @Deprecated 
    public void onNewPicture(WebView view, Picture picture) { 
     // stop listening 
     setPictureListener(null); 

     scrollTo(0, (int)(getContentHeight() * mScrollY)); 
     mScrollY = 0.0f; 
    } 
}; 

}

错误是表示我已经提到，为什么会出现这种情况？ 请帮我卡在这里两天

Answer 1

这里改变。

Context ctx; 

public EpubWebView(Context context) { 
    this(context, null); 
    this.ctx = context; 
} 

public EpubWebView(Context context, AttributeSet attrs) { 
super(context, attrs); 
    this.ctx = context; 
    mGestureDetector = new GestureDetector(context, mGestureListener); 
    WebSettings settings = getSettings(); 
    settings.setCacheMode(WebSettings.LOAD_NO_CACHE);   
setWebViewClient(mWebViewClient = createWebViewClient()); 
} 

现在改变这里

db = ctx.openOrCreateDatabase("epub.db", EpubWebView.this.MODE_PRIVATE,null); 
db = ctx.openOrCreateDatabase("epub.db", SQLiteDatabase.CREATE_IF_NECESSARY, null);