Android 在屏幕上长按后出现CursorIndexOutOfBoundsException

我正在使用gridview在我的应用程序中显示3行书籍封面图像。这些书籍从数据库中检索，当选择一本书时，它将在另一个活动中打开。如果您将手指放在屏幕上没有书的地方，则我的应用程序崩溃，我会收到一个CursorIndexOutOfBoundsException，如下面的日志猫所示。以下是单击gridview时的代码：

@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
    Cursor cursor = mGridAdapter.getCursor();
    cursor.moveToPosition(position);

    boolean downloaded = cursor.getInt(cursor.getColumnIndex(DatabaseHelper.COLUMN_BOOK_DOWNLOADED)) == 1;

    String remoteFilename = cursor.getString(cursor.getColumnIndex(DatabaseHelper.COLUMN_BOOK_REMOTE_FILENAME));
    int grade = cursor.getInt(cursor.getColumnIndex(DatabaseHelper.COLUMN_BOOK_GRADE));

    if (!downloaded) {
        String isbn = cursor.getString(cursor.getColumnIndex(DatabaseHelper.COLUMN_BOOK_ISBN));
        String title = cursor.getString(cursor.getColumnIndex(DatabaseHelper.COLUMN_BOOK_TITLE));

        ProgressBar currentProgressBar = (ProgressBar) view.findViewById(R.id.progressBarBookDownload);
        mProgressBarMap.put(isbn, currentProgressBar);

        ImageView imgCover = (ImageView) view.findViewById(R.id.imageViewCover);
        mCoverImageMap.put(isbn, imgCover);
        ImageView imgDownloadIcon = (ImageView) view.findViewById(R.id.imageViewDownloadIcon);
        mDownloadIconMap.put(isbn, imgDownloadIcon);
        imgDownloadIcon.setVisibility(View.INVISIBLE);

        String url = getBookCdnUrl(remoteFilename, grade);

        Bundle extras = new Bundle();
        extras.putString(DownloadTask.PARAM_URL, url);
        extras.putString(DatabaseHelper.COLUMN_BOOK_ISBN, isbn);
        extras.putString(DatabaseHelper.COLUMN_BOOK_TITLE, title);

        mTaskHandler = Groundy.create(DownloadTask.class).callback(this).args(extras).queue(this);
        mDownloadList.put(isbn, remoteFilename);
    }

    // book has already been downloaded, woop
    else {
        Log.d(TAG, "Clicked book is " + mFile.getAbsolutePath() + "/" + remoteFilename);

        openBook(remoteFilename, mFile.getAbsolutePath() + "/" + remoteFilename);
    }

    Log.d(TAG, "Book Selected: " + ((TextView) view.findViewById(R.id.textViewReadingLevel)).getText());
}

编辑：我认为这个问题是由我的长按造成的。当你按住屏幕3秒钟，它就会删除一本书。当它找不到一本书时，它就会崩溃。见下面的代码：

public void run() {
            Log.i(TAG, "Long press! Pos:" + mGridTouchPosition);

            Cursor cursor = mGridAdapter.getCursor();
            cursor.moveToPosition(mGridTouchPosition);

            String remoteFilename = cursor.getString(cursor.getColumnIndex(DatabaseHelper.COLUMN_BOOK_REMOTE_FILENAME));

            if (fileExistance(remoteFilename)) {
                View v;
                int pos = 0;

                v = mGridView.getChildAt(pos);

                while (!v.isPressed()) {
                    pos++;
                    v = mGridView.getChildAt(pos);
                }
                longPressedIsbn = cursor.getString(cursor.getColumnIndex(DatabaseHelper.COLUMN_BOOK_ISBN));

                deleteBook(v);
            }
        }
    };

---

您试图将光标移动到无效位置：

-1

。忽略无效位置，应用程序将不会崩溃

Cursor cursor = mGridAdapter.getCursor();

if (position < 0 || cursor.getCount() <= position) {
return;
}


cursor.moveToPosition(position);
...

Cursor Cursor=mGridAdapter.getCursor（）；
如果（position<0 | | cursor.getCount（），我尝试了，但应用程序仍然崩溃，日志中出现了相同的错误。您重建（清理）了吗？我将在一分钟后再次查看您的问题。我假设第940行是
cursor.moveToPosition（position）
？是的，我都试过了。请看我上面的编辑。这是我的长按。我会在长按中尝试你的代码。我在长按中使用了你上面的代码，效果很好。非常感谢。
Cursor cursor = mGridAdapter.getCursor();

if (position < 0 || cursor.getCount() <= position) {
return;
}


cursor.moveToPosition(position);
...