android 删除文件以及递归删除文件夹

 1 private void deleteDirectory(File file) { 
 2     if (file.isFile()) { 
 3         file.delete(); 
 4         return; 
 5     } 
 6 
 7     if(file.isDirectory()){ 
 8         File[] childFiles = file.listFiles(); 
 9         if (childFiles == null || childFiles.length == 0) { 
10             file.delete(); 
11             return; 
12         } 
13 
14         for (int i = 0; i < childFiles.length; i++) { 
15  deleteDirectory(childFiles[i]); 
16         } 
17         file.delete(); 
18     } 
19 }