Android简单的like和not like查询

Question

我正在尝试将光标与托管查询一起使用，以筛选设备上的媒体内容

String[] dirs = new String[] {"%"+ dir + "%"};

String[] musicdata = { BaseColumns._ID,
        MediaColumns.DATA,
        MediaColumns.DISPLAY_NAME,
        MediaColumns.SIZE };

musiccursor = getActivity().getContentResolver().query(
        MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, 
        musicdata, 
        MediaColumns.DATA + " like ? ", 
        dirs, 
        MediaColumns.DATA + " asc");

查询的where子句使用传递给它的目录，以便过滤该文件夹和子文件夹中的音乐。

我想要做的也是在同一查询中包含一个“不喜欢”。

这样做的原因是，用户能够从列表视图中排除文件夹，并且该文件夹存储在数组中并写入文件中，以便保留选择。我希望游标查询将这些排除项考虑在内，同时仍然链接到它们传递给它的文件夹。

提前感谢！

Answer 1

在回答我自己的问题时，下面是代码：

         //Build the where clause
         StringBuilder where = new StringBuilder();

         //first add in all values from the exclusion array
         for (int i = 0; i < excludedFolders.size(); i++) {
         where.append(MediaColumns.DATA + " not like ? ");
         where.append(" AND ");
         }
         //then add in the final like clause, e.g. the folder the user selected
         where.append(MediaColumns.DATA + " like ? ");

         //convert it to a string
         String selection = where.toString();

         System.out.println(selection);
         ////////////////////////////////////////////////////////////////////////////////////////////

         //Build the arguments.  the array is set to the size of the exlcusion list, plus 1 for the fodler selected
         String[] dirs = new String[excludedFolders.size()+1]; 
         System.out.println(excludedFolders.size()+1);
         //first add in a value for each excluded folder
         for (int i = 0; i < excludedFolders.size(); i++) {
                dirs[i] = "%" + excludedFolders.get(i) + "%";
                System.out.println(i + " " + dirs[i]);
            }
         //add the argument value for the like element of the query 
         dirs[excludedFolders.size()]="%"+ dir + "%";
         System.out.println("excludedFolders.size() " + dirs[excludedFolders.size()]);  
         //start building the cursor
         String[] musicdata = { BaseColumns._ID,
                MediaColumns.DATA,
                MediaColumns.DISPLAY_NAME,
                MediaColumns.SIZE };
         //run the query             
         musiccursor = getActivity().getContentResolver().query(
                    MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, 
                    musicdata, 
                    selection,
                    dirs, 
                    MediaColumns.DATA+ " asc");
         //done