图片缩略图在文件夹上显示

[andre0122]

怎么样能在一个文件夹上显示文件夹里面的图片内容，就像windows装图片的文件夹那样，在文件夹上显示4个缩略图

[BadPattern]

呵呵，我正好看过android1.5自带的图片浏览器，里边有一个方法正好是做这个事情的:

 private Bitmap makeMiniThumbBitmap(int width, int height, ImageManager.IImageList images) {
        int count = images.getCount();
        // We draw three different version of the folder image depending on the number of images in the folder.
        //    For a single image, that image draws over the whole folder.
        //    For two or three images, we draw the two most recent photos.
        //    For four or more images, we draw four photos.
        final int padding = 4;
        int imageWidth = width;
        int imageHeight = height;
        int offsetWidth = 0;
        int offsetHeight = 0;

        imageWidth = (imageWidth - padding) / 2;     // 2 here because we show two images
        imageHeight = (imageHeight - padding) / 2;   // per row and column

        final Paint  p = new Paint();
        final Bitmap b = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
        final Canvas c = new Canvas(b);

        final Matrix m = new Matrix();

        // draw the whole canvas as transparent
        p.setColor(0x00000000);
        c.drawPaint(p);

        // draw the mask normally
        p.setColor(0xFFFFFFFF);
        mFrameGalleryMask.setBounds(0, 0, width, height);
        mFrameGalleryMask.draw(c);

        Paint pdpaint = new Paint();
        pdpaint.setXfermode(new android.graphics.PorterDuffXfermode(
                                    android.graphics.PorterDuff.Mode.SRC_IN));

        pdpaint.setStyle(Paint.Style.FILL);
        c.drawRect(0, 0, width, height, pdpaint);

        for (int i = 0; i < 4; i++) {
            if (mPausing) {
                return null;
            }

            Bitmap temp = null;
            ImageManager.IImage image = i < count ? images.getImageAt(i) : null;

            if (image != null) {
                temp = image.miniThumbBitmap();
            }

            if (temp != null) {
                if (ImageManager.isVideo(image)) {
                    Bitmap newMap = temp.copy(temp.getConfig(), true);
                    Canvas overlayCanvas = new Canvas(newMap);
                    int overlayWidth = mVideoOverlay.getIntrinsicWidth();
                    int overlayHeight = mVideoOverlay.getIntrinsicHeight();
                    int left = (newMap.getWidth() - overlayWidth) / 2;
                    int top = (newMap.getHeight() - overlayHeight) / 2;
                    Rect newBounds = new Rect(left, top, left + overlayWidth, top + overlayHeight);
                    mVideoOverlay.setBounds(newBounds);
                    mVideoOverlay.draw(overlayCanvas);
                    temp.recycle();
                    temp = newMap;
                }

                Bitmap temp2 = ImageLoader.transform(m, temp, imageWidth, imageHeight, true);
                if (temp2 != temp)
                    temp.recycle();
                temp = temp2;
            }

            Bitmap thumb = Bitmap.createBitmap(imageWidth, imageHeight, Bitmap.Config.ARGB_8888);
            Canvas tempCanvas = new Canvas(thumb);
            if (temp != null)
                tempCanvas.drawBitmap(temp, new Matrix(), new Paint());
            mCellOutline.setBounds(0, 0, imageWidth, imageHeight);
            mCellOutline.draw(tempCanvas);

            placeImage(thumb, c, pdpaint, imageWidth, padding, imageHeight, padding, offsetWidth, offsetHeight, i);

            thumb.recycle();

            if (temp != null)
                temp.recycle();
        }

        return b;
    }

[BadPattern]

其实就是得到文件夹里边图片缩略图，然后用canvas画在文件夹上。不过你要计算画的位置和间隔等信息。

[BadPattern]

另外，这个方法并不是拿来就能用的，这只是其中的代码片段，如果你有源码，你可以找camera应用下的GalleryPicker类

[andre0122]

谢谢你，请问你是怎么import android.provider.DrmStore和import android.media.MediaMetadataRetriever的啊？

[sniffer12345]

[Quote=引用 4 楼 andre0122 的回复:]

谢谢你，请问你是怎么import android.provider.DrmStore和import android.media.MediaMetadataRetriever的啊？
[/Quote]
eclipse下，ctrl+o

[Y080Y]

楼主解决问题了吗?