从 SD 卡中选择和显示图像时出现奇怪的行为

Question

我制作了一个简单的 Android 应用程序，它在网格视图中显示图像，您可以选择一些图像并发送它们。这是我的 getView 方法。

 public View getView(intposition,ViewconvertView,ViewGroupparent)
    {
        查看v；
        if (convertView == null)
        {
            LayoutInflater li = getLayoutInflater();
            v = li.inflate(R.layout.imageview, null);

            final CheckBox cb = (CheckBox) v.findViewById(R.id.checkbox);
            cb.setOnCheckedChangeListener(new AddPhotos());

            ImageView iv = (ImageView) v.findViewById(R.id.image);

            //make image clickable so that it is checked when clicked on the image
            iv.setOnClickListener(new OnClickListener()
            {

                @Override
                public void onClick(View v)
                {
                    cb.setChecked((cb.isChecked() ? false : true));

                }
            });

            imagecursor.moveToPosition(position);

            uriList.add(imagecursor.getString(image_column_index));

            File image = new File(imagecursor.getString(image_column_index));

            Bitmap actualBitmap = resizeBitMapImage(image.getPath(), image_width, image_height);
            iv.setImageBitmap(actualBitmap);

            iv.setLayoutParams(new FrameLayout.LayoutParams(95, 95));
            System.gc();

        }
        else
        {
            v = convertView;
            System.gc();

        }
        return v;
    }
}

现在的问题是，对于较少的图像，即当所有图像都显示而无需滚动时，它工作得很好。但是，如果有图像不可见并且您必须向下滚动，那么它会通过重复先前的图像并在向下或向上滚动时更改图像的选中状态来显示奇怪的行为。我改变了 getView 方法，例如

公共视图 getView(int 位置，视图 ConvertView，ViewGroup 父级)

    {

        View v;
        if (convertView == null)
        {
            LayoutInflater li = getLayoutInflater();
            v = li.inflate(R.layout.imageview, null);

        }
        else
        {
            v = convertView;
            System.gc();

        }

        final CheckBox cb = (CheckBox) v.findViewById(R.id.checkbox);
        cb.setOnCheckedChangeListener(new AddPhotos());

        ImageView iv = (ImageView) v.findViewById(R.id.image);

        // make image clickable so that it is checked when clicked on the image
        iv.setOnClickListener(new OnClickListener()
        {

            @Override
            public void onClick(View v)
            {
                cb.setChecked((cb.isChecked() ? false : true));

            }
        });

        imagecursor.moveToPosition(position);

        uriList.add(imagecursor.getString(image_column_index));

        File image = new File(imagecursor.getString(image_column_index));

        Bitmap actualBitmap = resizeBitMapImage(image.getPath(), image_width, image_height);
        iv.setImageBitmap(actualBitmap);

        iv.setLayoutParams(new FrameLayout.LayoutParams(95, 95));
        System.gc();

        return v;
    }
}

现在图像的顺序没有改变，但向上或向下滚动会引发ANR，并且检查状态也会改变（我猜是随机的）。 traces.txt 显示它来自 resizeBitMapImage 方法中的 bitMapImage = BitmapFactory.decodeFile(filePath, options); 行，如下所示

public static Bitmap resizeBitMapImage(String filePath, int targetWidth, int targetHeight)

{
    Bitmap bitMapImage = null;
    // First, get the dimensions of the image
    Options options = new Options();
    options.inJustDecodeBounds = true;
    BitmapFactory.decodeFile(filePath, options);
    double sampleSize = 0;
    // Only scale if we need to
    // (16384 buffer for img processing)
    Boolean scaleByHeight = Math.abs(options.outHeight - targetHeight) >= Math.abs(options.outWidth - targetWidth);

    if (options.outHeight * options.outWidth * 2 >= 1638)
    {
        // Load, scaling to smallest power of 2 that'll get it <= desired
        // dimensions
        sampleSize = scaleByHeight ? options.outHeight / targetHeight : options.outWidth / targetWidth;
        sampleSize = (int) Math.pow(2d, Math.floor(Math.log(sampleSize) / Math.log(2d)));
    }

    // Do the actual decoding
    options.inJustDecodeBounds = false;
    options.inTempStorage = new byte[128];
    while (true)
    {
        try
        {
            options.inSampleSize = (int) sampleSize;
            bitMapImage = BitmapFactory.decodeFile(filePath, options);

            break;
        }
        catch (Exception ex)
        {
            try
            {
                sampleSize = sampleSize * 2;
            }
            catch (Exception ex1)
            {

            }
        }
    }

    return bitMapImage;
}

现在我对android开发非常陌生，并且非常困惑。请提供任何帮助，我们将不胜感激

编辑：图像正在添加到 gridview 中，getView 方法适用于该 gridview 的 imageAdapter。