android中知道文件的绝对路径，如何获得content开头的URI

//TYLT: add by duanyf 20121027 start
				String type = Utils.ensureNotNull(intent.getType());
				Log.d(TAG, "uri is " + uri);
				if (uri.getScheme().equals("file") && (type.contains("image/"))) {
					String path = uri.getEncodedPath();
					Log.d(TAG, "path1 is " + path);
					if (path != null) {
						path = Uri.decode(path);
						Log.d(TAG, "path2 is " + path);
						ContentResolver cr = this.getContentResolver();
						StringBuffer buff = new StringBuffer();
						buff.append("(")
								.append(Images.ImageColumns.DATA)
								.append("=")
								.append("'" + path + "'")
								.append(")");
						Cursor cur = cr.query(
								Images.Media.EXTERNAL_CONTENT_URI,
								new String[] { Images.ImageColumns._ID },
								buff.toString(), null, null);
						int index = 0;
						for (cur.moveToFirst(); !cur.isAfterLast(); cur
								.moveToNext()) {
							index = cur.getColumnIndex(Images.ImageColumns._ID);
							// set _id value
							index = cur.getInt(index);
						}
						if (index == 0) {
							//do nothing
						} else {
							Uri uri_temp = Uri
									.parse("content://media/external/images/media/"
											+ index);
							Log.d(TAG, "uri_temp is " + uri_temp);
							if (uri_temp != null) {
								uri = uri_temp;
							}
						}
					}
				}
            	//TYLT: add by duanyf 20121027 end

废话不多说，直接上代码。

第一个uri是file://开头的那种，通过URI.fromFile函数得来的。然后通过查询数据库的id值，拼出这个content开头的URI。