fie

 File file2 = new File("/sdcard/"  + "wuxifu002.amr");//该文件没有的话默认不会创建的

 file2.createNewFile();//有则不创建

/**
     * Constructs a new file using the specified path.
     *
     * @param path
     *            the path to be used for the file.
     */
    public File(String path) {
        this.path = fixSlashes(path);
    }

 

//如果该文件不存在，默认自动创建

FileOutputStream fos = new FileOutputStream("/sdcard/"  + "wuxifu003.amr");

 public FileOutputStream(String path) throws FileNotFoundException {
        this(path, false);
    }

 public FileOutputStream(String path, boolean append) throws FileNotFoundException {
        this(new File(path), append);
    }

//如果该文件不存在，默认不会自动创建
   FileInputStream fis = new FileInputStream("/sdcard/"  + "wuxifu003333.amr");

public FileInputStream(String path) throws FileNotFoundException {
        this(new File(path));
    }