java - Android 无法找到已放入 SD 卡的文件目录

Question

问题是我通过 DDMS Perspective 将文件放在数据和/data/data 文件夹中，当我尝试访问该文件时，发生了 FileNotFoundException。代码:

                String path = Environment.getExternalStorageState()+"/analyzer_settings.xml";
                System.out.println(path);

                try {
                    Scanner in = new Scanner(new File(path));
                    while (in.hasNext()) {
                        System.out.println(in.nextLine());
                    }
                } catch (FileNotFoundException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }

打印异常:

07-11 17:10:02.470: I/System.out(13506): mounted/analyzer_settings.xml
07-11 17:10:02.500: W/System.err(13506): java.io.FileNotFoundException: /mounted/analyzer_settings.xml: open failed: ENOENT (No such file or directory)

我也试过:

String path = Environment.getExternalStorageState()+"/data/analyzer_settings.xml";
or 
String path = Environment.getExternalStorageState()+"/data/data/analyzer_settings.xml";

对我没有任何作用。

Answer 1

使用

String path = Environment.getExternalStorageDirectory().getAbsolutePath()
              +"analyzer_settings.xml";

代替

 String path = Environment.getExternalStorageState()+"/analyzer_settings.xml";

---

编辑:因为正如文档所说:

getExternalStorageDirectory () :

Gets the Android external storage directory. This directory may not currently be accessible if it has been mounted by the user on their computer, has been removed from the device, or some other problem has happened. You can determine its current state with getExternalStorageState().

和

getExternalStorageState() :

Gets the current state of the primary "external" storage device.