查询图片库数据

Uri imgUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
                ContentResolver resolver = PhotoAlbumActivity.this.getContentResolver();
                Cursor cursor = resolver.query(imgUri, null,
                        MediaStore.Images.Media.DATA + " like ? and (" +
                                MediaStore.Images.Media.MIME_TYPE + "=? or "
                                + MediaStore.Images.Media.MIME_TYPE + "=?)",
                        new String[]{"%" + PathUtil.getPhotoPath() + "/%",
                                "image/jpeg", "image/png"},
                        MediaStore.Images.Media.DATE_MODIFIED + " DESC");

获取相关信息

String path = cursor.getString(cursor.getColumnIndex(MediaStore.Images.Media
                            .DATA));
                    Long time = cursor.getLong(cursor.getColumnIndex(MediaStore.Images.Media
                            .DATE_MODIFIED));
                    Date date = new Date(time * 1000);

扫描图片加入数据库

public static void refresh(Context context, String filename){//filename是我们的文件全名，包括后缀哦
        MediaScannerConnection.scanFile(context,
                new String[] { filename }, null,
                new MediaScannerConnection.OnScanCompletedListener() {
                    public void onScanCompleted(String path, Uri uri) {
                        Log.i("ExternalStorage", "Scanned " + path + ":");
                        Log.i("ExternalStorage", "-> uri=" + uri);
                    }
                });
    }

删除图片

ContentResolver resolver = mContext.getContentResolver();
        Cursor cursor = MediaStore.Images.Media.query(resolver, MediaStore.Images.Media.EXTERNAL_CONTENT_URI, new String[] { MediaStore.Images.Media._ID }, MediaStore.Images.Media.DATA + "=?",
                new String[] { imgPath }, null);
        boolean result = false;
        if (cursor.moveToFirst()) {
            long id = cursor.getLong(0);
            Uri contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
            Uri uri = ContentUris.withAppendedId(contentUri, id);
            int count = resolver.delete(uri, null, null);
            result = count == 1;
        } else {
            File file = new File(imgPath);
            result = file.delete();
        }