在SimpleCursorAdapter图片

问题描述

我试图使用 SimpleCursorAdapter 与 ViewBinder 来从数据库中获取的图像，并把它进入我的的ListView 项目视图。这是我的code：

I'm trying to use a SimpleCursorAdapter with a ViewBinder to get an image from the database and put it into my ListView item view. Here is my code:

    private void setUpViews() {
    mNewsView = (ListView) findViewById(R.id.news_list);

    Cursor cursor = getNews();
    SimpleCursorAdapter curAdapter = new SimpleCursorAdapter(
            getApplicationContext(), R.layout.cursor_item, cursor,
            new String[] { "title", "content", "image" },
            new int[] { R.id.cursor_title, R.id.cursor_content,
                    R.id.news_image });

    ViewBinder viewBinder = new ViewBinder() {

        public boolean setViewValue(View view, Cursor cursor,
                int columnIndex) {
            ImageView image = (ImageView) view;
            byte[] byteArr = cursor.getBlob(columnIndex);
            image.setImageBitmap(BitmapFactory.decodeByteArray(byteArr, 0, byteArr.length));
            return true;
        }
    };
    ImageView image = (ImageView) findViewById(R.id.news_image);
    viewBinder.setViewValue(image, cursor, cursor.getColumnIndex("image"));
    curAdapter.setViewBinder(viewBinder);
    mNewsView.setAdapter(curAdapter);
}

我得到一个：

I am getting a :

android.database.CursorIndexOutOfBoundsException: Index -1 requested, with a size of 60

在执行字节[] byteArr = cursor.getBlob（参数：columnIndex）; 。有没有人有一个想法，我究竟做错了什么？

while executing byte[] byteArr = cursor.getBlob(columnIndex);. Does anyone have an idea what am I doing wrong?

推荐答案

我觉得 cursor.moveToFirst（）还没有被调用，所以光标抛出 android.database.CursorIndexOutOfBoundsException。

I think the cursor.moveToFirst() has not been called so the cursor is throwing android.database.CursorIndexOutOfBoundsException.

使用光标之前您应经常检查是光标是空的或没有通过调用 cursor.moveToFirst（）。这也将在第一位置定位光标。

Before using a cursor you should always check is the cursor is empty or not by calling cursor.moveToFirst(). This will also position the cursor at the first position.

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