Android file read/write tool class

I write the tool class, write bad, slowly modify.

Remember to add permissions
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" />

 PackageCom.sy.utils;ImportAndroid.content.Context;ImportAndroid.os.Environment;ImportAndroid.os.StatFs;ImportAndroid.util.Log;ImportJava.io.BufferedInputStream;ImportJava.io.BufferedOutputStream;ImportJava.io.File;ImportJava.io.FileInputStream;ImportJava.io.FileOutputStream;ImportJava.io.IOException;ImportJava.io.InputStream;ImportJava.io.OutputStream;/** * Created by SY on 2016/5/9. * File read/write tool class */ Public  class FileUtils {    PrivateContext context;PrivateString Sdcardpath = Environment.getexternalstoragedirectory (). GetAbsolutePath ();//SD Card Path    Private StaticString sdstate = Environment.getexternalstoragestate ();//SD card Status     Public FileUtils(Context context) { This. Context = Context; }/** * file stored in/data/data/<packagename>/files/default directory * * @param fileName * @param b Ytes * @return * *     Public Boolean Write2cachefile(String FileName,byte[] bytes) {FileOutputStream out =NULL; Bufferedoutputstream BOS =NULL;Try{out = Context.openfileoutput (FileName, context.mode_private); BOS =NewBufferedoutputstream (out);            Bos.write (bytes); Bos.flush ();return true; }Catch(Exception e)        {E.printstacktrace (); }finally{if(Bos! =NULL) {Try{Bos.close (); }Catch(IOException e)                {E.printstacktrace (); }            }        }return false; }/** * Write bytes to sd card * * @param path folder directory * @param File file name * @param Data Write The byte array * @return * /     Public Static Boolean writebytes(string path, string file,byte[] data) {FileOutputStream FOS =NULL;Try{//have sufficient capacity            if(Data.length < Getsdfreesize ())                {createdirectoryifnotexist (path);                Createfileifnotexist (path + file); FOS =NewFileOutputStream (path + file.separator + File);                Fos.write (data); Fos.flush ();return true; }        }Catch(Exception e) {LOG.E ("Writebytes", E.getmessage ()); }finally{if(Fos! =NULL) {Try{Fos.close (); }Catch(IOException e)                {E.printstacktrace (); }            }return false; }    }/** * Read byte array from SD card * * @param Path directory * @param filename * @return  return byte array, file does not exist return NULL * /     Public Static byte[]readbytes(string path, String fileName) {File File =NewFile (path + file.separator + fileName);if(!file.exists ()) {return NULL; } InputStream InputStream =NULL;Try{InputStream =NewBufferedinputstream (NewFileInputStream (file));byte[] data =New byte[Inputstream.available ()]; Inputstream.read (data);returnData }Catch(IOException e)        {E.printstacktrace (); }finally{Try{if(InputStream! =NULL) {inputstream.close (); }            }Catch(IOException e)            {E.printstacktrace (); }        }return NULL; }/** * Writes a byte stream to the SD card file * * @param Path directory path * @param filename * @param input byte stream * @return * /     Public StaticBooleanWrite2sdfrominput(string path, string fileName, InputStream input) {File File =NULL; OutputStream output =NULL;Try{intSize = Input.available ();//have sufficient capacity            if(Size < Getsdfreesize ())                {createdirectoryifnotexist (path);                Createfileifnotexist (path + file.separator + fileName); File =NewFile (path + file.separator + fileName); Output =NewBufferedoutputstream (NewFileOutputStream (file));byteBuffer[] =New byte[1024x768];intTemp while(temp = input.read (buffer))! =-1) {output.write (buffer,0, temp); } output.flush ();return true; }        }Catch(IOException E1)        {E1.printstacktrace (); }finally{Try{if(Output! =NULL) {output.close (); }            }Catch(Exception e)            {E.printstacktrace (); }        }return false; }/** * Determine if the SD card exists * * @ return * *    Private Static Boolean sdcardisexist() {if(Sdstate.equals (environment.media_mounted)) {return true; }Else            return false; }/** * Get SD card remaining capacity size (in bytes) * * @return */     Public Static Long getsdfreesize() {//Get SD card file pathFile path = Environment.getexternalstoragedirectory (); StatFs SF =NewStatFs (Path.getpath ());//Gets the size of a single data block (Byte)        LongBlockSize = Sf.getblocksize ();//number of idle data blocks        LongFreeblocks = Sf.getavailableblocks ();//Return SD card idle size        returnFreeblocks * BLOCKSIZE;//Unit byte        //return (freeblocks * blockSize)/1024; Unit KB//Return (Freeblocks * blockSize)/1024/1024;//unit MB}/** * Get SD card Total capacity size (in bytes) * * @return */     Public Static Long getsdallsize() {//Get SD card file pathFile path = Environment.getexternalstoragedirectory (); StatFs SF =NewStatFs (Path.getpath ());//Gets the size of a single data block (Byte)        LongBlockSize = Sf.getblocksize ();//Get the number of all data blocks        LongAllblocks = Sf.getblockcount ();//Return SD card size        returnAllblocks * BLOCKSIZE;//Unit byte        //return (allblocks * blockSize)/1024;//unit KB//Return (Allblocks * blockSize)/1024/1024;//unit MB}/** * If directory does not exist, create directory * * @param Path directory * @return  */     Public Static Boolean createdirectoryifnotexist(String Path) {File File =NewFile (path);//If the folder does not exist, create        if(!file.exists () &&!file.isdirectory ()) {returnFile.mkdirs (); }Else{LOG.E ("Catalog","Directory exists!" ");return false; }    }/** * If the file does not exist, create the file * @param Path File * * @return * /     Public Static Boolean createfileifnotexist(String Path) {File File =NewFile (path);Try{if(!file.exists ()) {returnFile.createnewfile (); }Else{LOG.E ("File","File exists! ");return false; }        }Catch(Exception e) {LOG.E ("Error", E.getmessage ());return false; }    }}

Android file read/write tool class