Programmatically move files from cache directory to SDCard

Question

I'm trying to programmatically move files from the internal memory in Android to a existing directory in the SD card.
I tried two ways. In the first one I used File.renameTo:

String destName = externalDirPath + File.separatorChar + destFileName;
File originFile = new File(cacheDirPath + File.separatorChar + originalfileName);

originFile.renameTo(new File(destName));

In the other I used Runtime.getRuntime():

Process p = Runtime.getRuntime().exec("/system/bin/sh -");
DataOutputStream os = new DataOutputStream(p.getOutputStream());

String command = "cp " + cacheDirPath + "/" + originalfileName+ " " + externalDirPath + "/" + destFileName+ "\n";

os.writeBytes(command);

With both of them it doesn't work..

Any suggestion?

Answer 1

According to the Android API Reference of renameTo,

Both paths be on the same mount point. On Android, applications are most likely to hit this restriction when attempting to copy between internal storage and an SD card.

You will probably have to read the File into a byte[] and then write it into a new File. This answer covers it.