android - 从Android上的缩略图查询中获取图像

Question

我有这段代码(在这个网站的某处找到):

    public static List<MyImages> getImages(Activity context) {
    List<MyImages> lst = new ArrayList<MyImages>();
    Cursor cursor = getCameraThumbImages(context);
    if (cursor != null) {
        int columnIndex = cursor
                .getColumnIndexOrThrow(MediaStore.Images.Thumbnails._ID);
        int columnIndexPath = cursor
                .getColumnIndexOrThrow(MediaStore.Images.Thumbnails.DATA);
        int columnIndexImagePath = cursor
                .getColumnIndexOrThrow(MediaStore.Images.Thumbnails.IMAGE_ID);
        int count = cursor.getCount();
        for (int i = 0; i < count; i++) {
            cursor.moveToPosition(i);

            int imageID = cursor.getInt(columnIndex);
            String path = cursor.getString(columnIndexPath);
            Uri imgThmbPath = Uri.withAppendedPath(
                    MediaStore.Images.Thumbnails.EXTERNAL_CONTENT_URI, ""
                            + imageID);
            String hope = cursor.getString(columnIndexImagePath);
            MyImages p2p = new MyImages(path, "" + imageID);
            lst.add(p2p);
        }
    }

    return lst;
}

此代码允许我在手机上访问图像的缩略图。问题是我看不到如何从中获取原始图像路径。

问题是:给定缩略图(或光标)，如何获取原始图像路径？

Answer 1

缩略图中有 MediaStore.Images.Thumbnails.IMAGE_ID 字段，您可以从中获取相关的图像 ID。比查询 MediaStore.Images.Media 并从 MediaStore.Images.Media.DATA 字段获取您的照片的路径。

编辑

// First request thumbnails what you want
String[] projection = new String[] {MediaStore.Images.Thumbnails._ID, MediaStore.Images.Thumbnails.IMAGE_ID};
Cursor thumbnails = contentResolver.query(MediaStore.Images.Thumbnails.EXTERNAL_CONTENT_URI, projection, null, null, null);

// Then walk thru result and obtain imageId from records
for (thumbnails.moveToFirst(); !thumbnails.isAfterLast(); thumbnails.moveToNext()) {
    String imageId = thumbnails.getString(thumbnails.getColumnIndex(Thumbnails.IMAGE_ID));

    // Request image related to this thumbnail 
    String[] filePathColumn = { MediaStore.Images.Media.DATA };

    Cursor images = contentResolver.query(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, filePathColumn, MediaStore.Images.Media._ID + "=?", new String[] {imageId}, null);

    if (cursor != null && cursor.moveToFirst()) {
        // Your file-path will be here
        String filePath = cursor.getString(cursor.getColumnIndex(filePathColumn[0]));
    }

}

//Of course you need to restrict queries using selection and selection args params and get only rows that you really need