[ANDROID] 파일명 변경

파일명 변경 하고 싶을 때,

1. File beforeFileName;
2. File afterFileName;
3.  
4. beforeFileName = new File(Environment.getExternalStorageDirectory().getAbsolutePath() + "folder name", "target file name");
5. afterFileName = new File(Environment.getExternalStorageDirectory().getAbsolutePath() + "folder name", "modifi file name");
6.  
7. if (beforeFileName.renameTo(afterFileName))
8.     Toast.makeText(getApplicationContext(), "success!", Toast.LENGTH_SHORT).show();
9. else
10.     Toast.makeText(getApplicationContext(), "faile", Toast.LENGTH_SHORT).show();