安卓怎么判断xml是否存在

Question

这个xml是生成在手机应用下的data文件夹里的，我想知道读取的时候怎么判断xml是否存在

Answer 1

openFileOutput

Open a private file associated with this Context's application package for writing. Creates the file if it doesn't already exist.
No additional permissions are required for the calling app to read or write the returned file.

所以在默认模式下，不存在就会帮你创建一个。若是要存在的情况下追加，用MODE_APPEND

File creation mode: for use with openFileOutput(String, int), if the file already exists then write data to the end of the existing file instead of erasing it.