A tool for Image Storage and SD Card Operations

Source: Internet
Author: User
Package COM. yzxy. tool; import Java. io. bufferedinputstream; import Java. io. bufferedoutputstream; import Java. io. file; import Java. io. fileinputstream; import Java. io. filenotfoundexception; import Java. io. fileoutputstream; import Java. io. ioexception; import Java. io. inputstream; import Java. io. outputstream; import android. graphics. bitmap; import android. graphics. bitmapfactory; import android. OS. environment; Public Class fileutils {private string sdcardroot; private string sdstatestring; private final static string album_path = environment. getexternalstoragedirectory () + "/yueqiu/"; Public fileutils () {// get the directory sdcardroot = environment of the current external storage device. getexternalstoragedirectory (). getabsolutepath () + file. separator; // get the status of the extended SD card device sdstatestring = environment. getexternalstoragestate ();} public file createfileinsdca Rd (string Dir, string filename) throws ioexception {file = new file (sdcardroot + dir + file. separator + filename); file. createnewfile (); Return file;} public file creatsddir (string DIR) {file dirfile = new file (sdcardroot + dir + file. separator); If (! Dirfile. exists () {dirfile. mkdirs () ;}return dirfile;} public Boolean isfileexist (string filename) {file = new file (album_path + filename); Return file. exists ();} Public String getfilepath (string Dir, string filename) {return sdcardroot + dir + file. separator + filename;} public long getsdavailablesize () {If (sdstatestring. equals (Android. OS. environment. media_mounted) {// get the sdcard file path file pathfile = Droid. OS. environment. getexternalstoragedirectory (); android. OS. statfs = new android. OS. statfs (pathfile. getpath (); // obtain the sizelong nblocsize = statfs. getblocksize (); // obtain the number of blocks available for the program. Long navailablock = statfs. getavailableblocks (); // calculate the remaining sdcard size bytelong nsdfreesize = navailablock * nblocsize; return nsdfreesize;} return 0;} public Boolean write2sd (string Dir, string filename, Te [] bytes) {If (Bytes = NULL) {return false;} outputstream output = NULL; try {// has read and write permissions, and there is enough capacity if (sdstatestring. equals (Android. OS. environment. media_mounted) & bytes. length <getsdavailablesize () {file = NULL; creatsddir (DIR); file = createfileinsdcard (Dir, filename); Output = new bufferedoutputstream (New fileoutputstream (File); output. write (bytes); output. flush (); Return true ;}} catch (ioexce Ption E1) {// todo auto-generated catch blocke1.printstacktrace ();} finally {try {If (output! = NULL) {output. close () ;}} catch (exception e) {e. printstacktrace () ;}} return false;} public bitmap readbitmap (string path) {file = new file (album_path + path); bitmapfactory. options opt = new bitmapfactory. options (); If (! File. exists () {return NULL;} inputstream = NULL; try {inputstream = new bufferedinputstream (New fileinputstream (File); OPT. inpreferredconfig = bitmap. config. rgb_565; OPT. inpurgeable = true; OPT. ininputexcepable = true;} catch (filenotfoundexception e) {e. printstacktrace ();} catch (ioexception e) {e. printstacktrace ();} // bitmap bit = bitmapfactory. decodefile (album_path + path );/ /Return bit; return bitmapfactory. decodestream (inputstream, null, OPT);} public byte [] readfromsd (string Dir, string filename) {file = new file (sdcardroot + dir + file. separator + filename); If (! File. exists () {return NULL;} inputstream = NULL; try {inputstream = new bufferedinputstream (New fileinputstream (File); byte [] DATA = new byte [inputstream. available ()]; inputstream. read (data); return data;} catch (filenotfoundexception e) {e. printstacktrace ();} catch (ioexception e) {e. printstacktrace ();} finally {try {If (inputstream! = NULL) {inputstream. close () ;}} catch (ioexception e) {// todo auto-generated Catch Block E. printstacktrace () ;}return NULL;} public file write2sdfrominput (string Dir, string filename, inputstream input) {file = NULL; outputstream output = NULL; try {int size = input. available (); // has the read and write permissions, and has sufficient capacity if (sdstatestring. equals (Android. OS. environment. media_mounted) & size <getsdavailablesize ()) {Creatsddir (DIR); file = createfileinsdcard (Dir, filename); Output = new bufferedoutputstream (New fileoutputstream (File); byte buffer [] = new byte [4*1024]; int temp; while (temp = input. read (buffer ))! =-1) {output. write (buffer, 0, temp);} output. flush () ;}} catch (ioexception E1) {// todo auto-generated catch blocke1.printstacktrace () ;} finally {try {If (output! = NULL) {output. close () ;}} catch (exception e) {e. printstacktrace () ;}} return file;} public void SaveFile (Bitmap BM, string filename) throws ioexception {file dirfile = new file (album_path); filename = filename. replace ("/", "_"); If (! Dirfile. exists () {dirfile. mkdir ();} file mycapturefile = new file (album_path + filename); bufferedoutputstream Bos = new bufferedoutputstream (New fileoutputstream (mycapturefile); BM. compress (bitmap. compressformat. JPEG, 80, Bos); Bos. flush (); Bos. close (); system. out. println ("saved successfully ");}}

 

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

  • Sales Support

    1 on 1 presale consultation

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.