Question

I want to use an Non Blocking IO to read a stream/output from a background process.Can anyone give me an example on how to use the Non Blocking IO on Android?

Thanks for the help.

Answer 1

Here is the class I use to download a file from the internet or copy a file within the filesystem and how I use it:

// Download a file to /data/data/your.app/files
new DownloadFile(ctxt, "http://yourfile", ctxt.openFileOutput("destinationfile.ext", Context.MODE_PRIVATE));

// Copy a file from raw resource to the files directory as above
InputStream in = ctxt.getResources().openRawResource(R.raw.myfile);
OutputStream out = ctxt.openFileOutput("filename.ext", Context.MODE_PRIVATE);
final ReadableByteChannel ic = Channels.newChannel(in);
final WritableByteChannel oc = Channels.newChannel(out);
DownloadFile.fastChannelCopy(ic, oc);

There also is the Selector approach, here are some great (Java) tutorials about Selectors, Channels and Threads:

1. http://jfarcand.wordpress.com/2006/05/30/tricks-and-tips-with-nio-part-i-why-you-must-handle-op_write
2. http://jfarcand.wordpress.com/2006/07/06/tricks-and-tips-with-nio-part-ii-why-selectionkey-attach-is-evil/
3. http://jfarcand.wordpress.com/2006/07/07/tricks-and-tips-with-nio-part-iii-to-thread-or-not-to-thread/
4. http://jfarcand.wordpress.com/2006/07/19/httpweblogs-java-netblog20060719tricks-and-tips-nio-part-iv-meet-selectors/
5. http://jfarcand.wordpress.com/2006/09/21/tricks-and-tips-with-nio-part-v-ssl-and-nio-friend-or-foe/