android - 如何获取缩略图在sd卡中的路径

Question

我使用下面的代码获取 sd 卡中图像的文件路径。

File[] f = (Environment.getExternalStorageDirectory()).listFiles();
int i;
for(i = 0; i < f.length; i++) {
if(f[i].isFile()) {
if(isPhoto(f[i].getName())) {
Filepath.add(f[i].getAbsolutePath());
}
}
else {
//recursive
}
}

我想通过知道原始图像路径来获取图像缩略图的路径。怎么做？

Answer 1

您可以从这样的文件中获取 Uri:

Uri uri = Uri.fromFile(new File("/mnt/images/abc.jpg"));
Bitmap thumbnail = getPreview(uri);
And the following function gives you the thumbnail:

Bitmap getPreview(URI uri) {
    File image = new File(uri);

    BitmapFactory.Options bounds = new BitmapFactory.Options();
    bounds.inJustDecodeBounds = true;
    BitmapFactory.decodeFile(image.getPath(), bounds);
    if ((bounds.outWidth == -1) || (bounds.outHeight == -1))
        return null;

    int originalSize = (bounds.outHeight > bounds.outWidth) ? bounds.outHeight
            : bounds.outWidth;

    BitmapFactory.Options opts = new BitmapFactory.Options();
    opts.inSampleSize = originalSize / THUMBNAIL_SIZE;
    return BitmapFactory.decodeFile(image.getPath(), opts);     
}