Question

我在外部SD卡中复制文件时遇到问题：这是我在日志消息中得到的内容：

04-06 17:52:36.804: DEBUG/Carburant(258): Sdcard can read/write !!
04-06 17:52:36.864: DEBUG/Carburant(258): /mnt/sdcard/mnt/sdcard/settings.dat (No such file or directory)

这是我的代码：

public class Import {
    private Context context;
    private String nom;


    public Import(Context context,String nom) {
        this.context = context;
        this.nom=nom;
       }

    public void transfer(){

    File sdCard = Environment.getExternalStorageDirectory();
    boolean mExternalStorageAvailable = false;
    boolean mExternalStorageWriteable = false;
    String state = Environment.getExternalStorageState();

    if (Environment.MEDIA_MOUNTED.equals(state)) {
        // We can read and write the media
        Log.d("Carburant", "Sdcard can read/write !!" ); 
        mExternalStorageAvailable = mExternalStorageWriteable = true;
        File root = Environment.getExternalStorageDirectory();
        File nmea_file = new File(root,"settings.dat");
        copyfile(nom,sdCard.getAbsolutePath() + nmea_file);
    } else if (Environment.MEDIA_MOUNTED_READ_ONLY.equals(state)) {
        // We can only read the media
        Log.d("Carburant", "Sdcard only read !!" ); 
        mExternalStorageAvailable = true;
        mExternalStorageWriteable = false;
    } else {
        // Something else is wrong. It may be one of many other states, but all we need
        //  to know is we can neither read nor write
        mExternalStorageAvailable = mExternalStorageWriteable = false;
    }

这是我的copyfile函数：

private void copyfile(String srFile, String dtFile){
        try{
            File f1 = new File(srFile);
            File f2 = new File(dtFile);
          InputStream in = new FileInputStream(f1);
          OutputStream out = new FileOutputStream(f2);

          byte[] buf = new byte[1024];
          int len;
          while ((len = in.read(buf)) > 0){
            out.write(buf, 0, len);
          }
          in.close();
          out.close();
          Toast.makeText(context, "Export effectu�", Toast.LENGTH_SHORT).show();
        }
        catch(FileNotFoundException ex){
            Toast.makeText(context, "File Not found", Toast.LENGTH_SHORT).show();
            String x=ex.getMessage();
            Log.d("Carburant", x);
        }
        catch(IOException e){
            Toast.makeText(context, "Echec", Toast.LENGTH_SHORT).show();      
        }
      }

我不知道为什么编译器将/mnt/sdcard/mnt/sdcard/settings.dat作为输出文件，/ mnt / sdcard中有重复... 谢谢你的帮助。

File dir = new File (sdCard.getAbsolutePath() + "/Carburant/");
        dir.mkdirs();
        File file = new File(dir, "settings.dat");
        copyfile(nom,dir.getAbsolutePath());

Answer 1

尝试使用：

copyfile(nom, nmea_file.getAbsolutePath());

代替。

您从"/mnt/sdcard"变量中获得一个root，从sdCard变量中获得另一个变种。

Answer 2

因为你这样做了你的nmea_file已经基于root了.. copyfile（nom， sdCard.getAbsolutePath（）+ nmea_file ）

没有相应的文件和目录

2 个答案: