Question

Logcat在memorymethod.java中的这些行中显示错误所有与getexternalpath()方法相关的错误，我在下面的memorymothod.java代码中给出了它。

StatFs statFs2 = new StatFs(getExternalPath());
public static double getExternalUsedStorage()
{
    return Double.parseDouble(getExternalTotalMemory())-Double.parseDouble(getExternalFreeMemory());
}

以下是memorymethod.java的一些代码：

public static String getExternalPath()
{
     String sSDpath = null;
     File   fileCur = null;
     for( String sPathCur : Arrays.asList("MicroSD", "external_SD", "sdcard1", "ext_card", "external_sd", "ext_sd", "external", "extSdCard", "externalSdCard")) // external sdcard
     {
          fileCur = new File( "/mnt/", sPathCur);
          if( fileCur.isDirectory() && fileCur.canWrite())
          {
              sSDpath = fileCur.getAbsolutePath();
              break;
          }
          if( sSDpath == null)
          {
              fileCur = new File( "/storage/", sPathCur);
              if( fileCur.isDirectory() && fileCur.canWrite())
              {
                  sSDpath = fileCur.getAbsolutePath();
                  break;
              }
          }
          if( sSDpath == null)
          {
              fileCur = new File( "/storage/emulated", sPathCur);
              if( fileCur.isDirectory() && fileCur.canWrite())
              {
                  sSDpath = fileCur.getAbsolutePath();
                  //Log.e("path",sSDpath);
                  break;
              }               
        }
        fileCur = new File( "/storage/extSdCard");
        return fileCur.getAbsolutePath();
 }

Answer 1

检查此代码

String fileName="abc.txt";

File file = new File(fileName);

File dirAsFile = file.getParentFile();

使用此代码，您将使用外部或内部存储路径获取ur文件的路径

Answer 2

使用它来获取特定文件

File dir = new File (Environment.getExternalStorageDirectory().getAbsolutePath() + "/PersonData");
File file   =   new File(dir, "Data.pdf");

这里Data.pdf是我的＆＃34; PersonData＆＃34;中的文件名。外部存储中的命名文件夹

Answer 3

我希望这会对你有所帮助：

public static long getExternalStorageAvailableSpace() {
    long availableSpace = -1L;
    try {
        StatFs stat = new StatFs(Environment.getExternalStorageDirectory()                .getPath());
        stat.restat(Environment.getExternalStorageDirectory().getPath());
        availableSpace = (long) stat.getAvailableBlocks() * (long) stat.getBlockSize();
    } catch (Exception e) {
        e.printStackTrace();
    }

    return availableSpace;
}

Answer 4

我还没有在menifest中添加这两个权限

r JOIN hits as h ON h.id = r.id  WHERE (r.date >= now() - INTERVAL 1 DAY) ORDER BY h.hits DESC LIMIT 0,8

外部存储错误，这些是两个错误，1.ENOENT（没有这样的文件或目录）2。无效路径：/ storage / extSdCard

4 个答案: