Several ways to merge files that are developed by Android

Here are a few ways to merge files, and combine AMR files to illustrate the detailed process of merging files. the file header in AMR format is 6 bytes, so the file header is subtracted from files other than the first file when the file is merged.

Note: different file header is not the same, so at the time of merging according to different files corresponding to subtract the file header of the merged file.

Step one: Get the files to be merged and create the files saved after merging

/** is used to hold a collection of files to be merged **/list<file>tempfiles=new arraylist<file> ();/** merged files **/file finalfile;

/** * Create files for merging * @param istempfile is a temporary file * @return soundfile file * */private file GETF Ile (Boolean istempfile) {//TODO auto-generated method Stubfinalfile=null;if (! Environment.getexternalstoragestate (). Equals (environment.media_mounted)) {LOG.W ("waring", "checked to your phone without inserting an SD card, Please insert SD and try again! ");} Gets the system's 24-hour time as the file name (HH is 24-hour, HH is 12-hour) SimpleDateFormat simpledateformat=new SimpleDateFormat (" Yyyy-mm-dd-hh-mm-ss ", Locale.getdefault ()); String Filename=simpledateformat.format (New Date ()) + ". Amr"; if (istempfile) {//assumed to be temporary file filename= "temp" +filename;} try {file parentfile= new File (Environment.getexternalstoragedirectory (). Getcanonicalfile () + "/" + "Recorder"); Parentfile.exists () | | Parentfile==null) {//Assume that the folder does not exist Parentfile.mkdirs ();//Create Parentfile folder}finalfile=new File (Parentfile, fileName);} catch (IOException e) {//TODO auto-generated catch Blocke.printstacktrace ();} return finalfile;} 

Step Two: Merge files

Way one: Through FileOutputStream, and FileInputStream Way

/** * Merge multiple files with FileOutputStream, FileInputStream mode * and delete the original file * */public void MergeFiles1 () {//TODO auto-generated Metho D stubif (Tempfiles.isempty ()) return;//if not recorded yet, do not merge file Realfile=getfile (false); try {FileOutputStream fos=new FileOutputStream (Realfile); for (int i = 0; i < tempfiles.size (); i++) {//Traverse tempfiles Collection, merge all temporary files FileInputStream fis= New FileInputStream (Tempfiles.get (i)); byte[] tmpbytes = new byte[fis.available ()];int length = tmpbytes.length;//file length/ /header file if (i==0) {while (Fis.read (tmpbytes)!=-1) {fos.write (tmpbytes,0,length);}} After the file, remove the header file will be able to. amr format the header information for a file is 6 bytes else{while (fis.read (tmpbytes)!=-1) {fos.write (tmpbytes,6,length-6);}} Fos.flush (); Fis.close ();} Fos.close ();//The end of all file merges, close the output stream log.i ("info", "This recording file:" +realfile.getname () + "saved to:" +realfile.getabsolutepath () + " Folder ");} catch (Exception e) {//TODO auto-generated catch Blocke.printstacktrace ();} Delete the merged temporary file for (file file:tempfiles) {if (file.exists ()) {File.delete ();}}}

Way Two:by FileChannel Way

/** * by filechannel mode * */public void MergeFiles2 () {File realfile=getfile (false); FileChannel mfilechannel;try {fileoutputstream fos=new fileoutputstream (realfile); Mfilechannel=fos.getchannel ();    FileChannel Infilechannel;    for (file file:tempfiles) {                     infilechannel=new fileinputstream (file). Getchannel ();        The following should be based on different files minus the corresponding file header (here does not cut the file header, the actual application should be subtracted)        Infilechannel.transferto (0, Infilechannel.size (), mfilechannel);                     Infilechannel.close ();    }           Fos.close ();    Mfilechannel.close ();} catch (Exception e) {//TODO auto-generated catch Blocke.printstacktrace ();}}

Way Three:by Randomaccessfile Way

/** * by randomaccessfile mode * */public void MergeFiles3 () {try{    File realfile=getfile (false);    FileOutputStream fos = new FileOutputStream (realfile);    Randomaccessfile RA = null;    for (int i = 0; i < tempfiles.size (); i++) {        RA = new Randomaccessfile (Tempfiles.get (i), "R");    if (i! = 0) {    ra.seek (6);//Skip file header of AMR file    }    byte[] buffer = new byte[1024 * 8];    int len = 0;    while (len = ra.read (buffer))! =-1) {    fos.write (buffer, 0, Len);    }   }   Ra.close ();   Fos.close ();  } catch (Exception e) {  e.printstacktrace ();  }}

Several ways to merge files that are developed by Android