java - 如何从Android中的文件夹中删除具有特定扩展名的文件

Question

我是 Android 新手。我生成一个录制音频文件，生成一个文本文件，压缩这两个文件并加密它们。

我想删除以下扩展名 .txt、.mp4 和 .zip。我只希望我的加密文件保留在包含 .txt 和 .mp4 的目录中

我做了研究并发现了以下来源并尝试对其进行修改。

private static final String DEFAULT_STORAGE_DIRECTORY = "Recorder";
       private static final String FILE_RECORD_EXT = ".mp4";
       private static final String FILE_INI_EXT = ".txt";
       private static final String FILE_ZIP_EXT = ".zip";

       public static void main(String args[]) {
        new FileChecker().deleteFile(DEFAULT_STORAGE_DIRECTORY,FILE_RECORD_EXT,FILE_TXT_EXT);
       }

       public void deleteFile(String folder, String ext, String fileTxtExt){

         GenericExtFilter filter = new GenericExtFilter(ext);
         File dir = new File(folder);



         String[] list = dir.list(filter);

         if (list.length == 0) return;
         //Files 
         File fileDelete;

         for (String file : list){
         String temp = new StringBuffer(DEFAULT_STORAGE_DIRECTORY)
                          .append(File.separator)
                          .append(file).toString();
            fileDelete = new File(temp);
            boolean isdeleted = fileDelete.delete();
            System.out.println("file : " + temp + " is deleted : " + isdeleted);
         }
       }

       //inner class, generic extension filter 
       public class GenericExtFilter implements FilenameFilter {

           private String ext;

           public GenericExtFilter(String ext) {
             this.ext = ext;             
           }

           public boolean accept(File dir, String name) {
             return (name.endsWith(ext));
           }
        }
    }

您的帮助将不胜感激。

Answer 1

void deleteFiles(String folder, String ext)
{
    File dir = new File(folder);
    if (!dir.exists())
        return;
    File[] files = dir.listFiles(new GenericExtFilter(ext));
    for (File file : files)
    {
        if (!file.isDirectory())
        {
            boolean result = file.delete();
            Log.d("TAG", "Deleted:" + result);
        }
    }
}