我试图从一个目录文件移动到另一个（SD卡）

我有一个文件的URI的方式和我试图移动：

 乌里selectedImage = imageReturnedIntent.getData（）; //这个URI，类似的内容：//媒体/外部/图像/媒体/ 635文件SD卡= Environment.getExternalStorageDirectory（）;从=新的文件文件（SD卡，selectedImage）;文件以=新的文件（SD卡，myNewDir / mynewfile.jpg）;from.renameTo（到）; 

但它不工作，它也没有给我任何错误的logcat ...

编辑：

我已经加入这两个权限，以我的清单文件：

 ＆LT;使用许可权的android：NAME =android.permission.WRITE_EXTERNAL_STORAG​​E/＆GT;   ＆LT;使用许可权的android：NAME =android.permission.READ_EXTERNAL_STORAG​​E/＆GT; 

解决方案

  //这个URI，类似的内容：//媒体/外部/图像/媒体/ 635 

那么你在做什么，正在尝试来连接到这个 Environment.getExternalStorageDirectory（）。这是行不通的。 内容：//媒体/外部/图像/媒体/ 635 既不是一个相对的文件系统路径也没有一个绝对的文件系统路径。这是一个乌里。

如果您希望将图像从乌里本地文件，使用 ContentResolver的来得到一个复制的InputStream 由乌里 psented图像重新$ p $，然后使用Java I / O从复制字节在的InputStream 到目标文件。

I'm trying to move a file from one directory to another (in SD Card)

I have a file's URI and the way I'm trying to move it:

Uri selectedImage = imageReturnedIntent.getData(); // this the uri, something like content://media/external/images/media/635

File sdcard = Environment.getExternalStorageDirectory();
File from = new File(sdcard, selectedImage);
File to = new File(sdcard, "myNewDir/mynewfile.jpg");
from.renameTo(to);

But it doesnt work, neither does it give me any error in Logcat...

Edit:

I have added both permissions to my manifest file:

   <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
   <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

// this the uri, something like content://media/external/images/media/635

What you are then doing is trying to concatenate this onto Environment.getExternalStorageDirectory(). This will not work. content://media/external/images/media/635 is neither a relative filesystem path nor an absolute filesystem path. It is a Uri.

If you wish to copy the image from the Uri to a local file, use a ContentResolver to get an InputStream on the image represented by the Uri, then use Java I/O to copy the bytes from the InputStream to your target file.