A combination of res/raw and java.nio.channels.FileChannel.map() are likely to give you the best performance. If you know your maximum record size, then using get on the Buffer into a byte array, b, then wrapping that in a new DataInputStream(new ByteArrayInputStrea(b)) will make it easy to read.
On Nov 27, 6:17 am, Rockthesmurf <[email protected]> wrote: > I package up all my files in to a single file - rename it to mp3 and > put it in res/raw. I then get get file descriptor/offset/size and pass > it over JNI to C code which I can then access the files data at an > acceptable speed. My APK is around 10MB. > > Steve > > On Nov 24, 8:09 am, Marc Reichelt <[email protected]> wrote: > > > > > Hi! > > > I am writing a program where I have to access some static data, and > > now I am looking for the best method of how to include them into the > > project. > > > This is what I found out by now: > > > 1. Reading in the data by parsing an XML is *slow* (even using the SAX > > parser). > > 2. Reading the data by parsing a CSV file is faster than loading an > > XML, but again is too slow. > > 3. Putting the data into a Java file directly (e.g. by defining an > > array) fails because Dalvik says it is too large. > > 4. Reading in the data using serialization is slow. The funny thing > > here is: It takes a bit longer than loading the XML file. > > 5. Reading in the data from a SQLite database is the fastest method > > until now. But a bad workaround is needed: A SQLite DB can not yet be > > read directly from the resources, but instead has to be copied to the > > cache or to the SD card - even for read-only access. > > > Right now I am using method 5, but I would really like to use a more > > simplified and faster solution. > > > What I found out: Unserialization in Java is *fast* (reading a HashMap > > with 5000 integers and strings in 79ms on my PC), while the same > > action on my G1 takes over 13500ms. I know that I can not compare a PC > > to a mobile device. But still, there seems to be a big difference > > here. I think that the JRE directly copies the serialized data to RAM, > > while Dalvik seems to read every object step by step. Is this going to > > change in the future? > > > And, most interestingly: what do you do to access lots of static > > information? > > > Thanks in advance & happy hacking > > > Marc Reichelt || http://www.marcreichelt.de/ -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
