java - FileNotFoundException 仅在 Android 应用程序中

Question

为什么我只在 Android 应用程序中遇到 FileNotFoundException，而当我从普通 Java 应用程序中读取它时，它会找到目录。

我正在使用完全相同的代码。

{
        BufferedReader bufRdr;
         contacts = new ArrayList<Contacts>();


        File randomContactsFile = new File(("C://test//randomcontacts.txt"));
        try {
         bufRdr = new BufferedReader(new FileReader(randomContactsFile));
    String line = null;
         String[] a = new String[2];

            while ((line = bufRdr.readLine()) != null)
                    {
                        a = line.split(",");
                        Contacts c = new Contacts(a[0], a[1], a[1], a[1], a[2]);
                        contacts.add(c);
                    }

        } catch (FileNotFoundException e) {
            Log.d("file not found", "check");
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

这是异常(exception):

 10-05 08:04:37.151: WARN/System.err(334):
 java.io.FileNotFoundException: /C:/test/randomcontacts.txt (No such
 file or directory) 10-05 08:04:37.151: WARN/System.err(334):     at
 org.apache.harmony.luni.platform.OSFileSystem.open(Native Method)
 10-05 08:04:37.161: WARN/System.err(334):     at
 dalvik.system.BlockGuard$WrappedFileSystem.open(BlockGuard.java:232)
 10-05 08:04:37.161: WARN/System.err(334):     at
 java.io.FileInputStream.<init>(FileInputStream.java:80) 10-05
 08:04:37.161: WARN/System.err(334):     at
 java.io.FileReader.<init>(FileReader.java:42) 10-05 08:04:37.161:
 WARN/System.err(334):     at
 android.test.randomcontacts.RandomContactsActivity.readRandomContacts(RandomContactsActivity.java:177)
 10-05 08:04:37.161: WARN/System.err(334):     at
 android.test.randomcontacts.RandomContactsActivity.onCreate(RandomContactsActivity.java:55)
 10-05 08:04:37.161: WARN/System.err(334):     at
 android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
 10-05 08:04:37.161: WARN/System.err(334):     at
 android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611)
 10-05 08:04:37.161: WARN/System.err(334):     at
 android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663)
 10-05 08:04:37.161: WARN/System.err(334):     at
 android.app.ActivityThread.access$1500(ActivityThread.java:117)

谢谢

Answer 1

您的 Android 手机上可能没有 C: 驱动器。

您可以用于外部驱动器:

Environment.getExternalStorageDirectory() + /* file */;