【Android】图片/文件的处理方法

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    public static Bitmap rotateBitmap(Bitmap bmp, float degree) {        Matrix matrix = new Matrix();        matrix.postRotate(degree);  //旋转        matrix.postScale(-1, 1);  //镜像水平翻转        return Bitmap.createBitmap(bmp, 0, 0, bmp.getWidth(), bmp.getHeight(), matrix, true);    }    private void copyBigDataToSD(String strOutFileName) throws IOException    {        File fData = new File(strOutFileName);        try{            if (!fData.exists()){   //not exist, copy                InputStream myInput;                OutputStream myOutput = new FileOutputStream(strOutFileName);                myInput = this.getAssets().open("data.bin");                byte[] buffer = new byte[1024];                int length = myInput.read(buffer);                while(length > 0)                {                    myOutput.write(buffer, 0, length);                    length = myInput.read(buffer);                }                myOutput.flush();                myInput.close();                myOutput.close();            }        }catch (Exception e ){            Log.e(TAG, "file data.bin ERROR!");        }    }    private void copyBigDataToSD1(String strOutFileName) throws IOException    {        File fData = new File(strOutFileName);        try{            if (!fData.exists()){   //not exist, copy                InputStream myInput;                OutputStream myOutput = new FileOutputStream(strOutFileName);                myInput = this.getAssets().open("data1.bin");                byte[] buffer = new byte[1024];                int length = myInput.read(buffer);                while(length > 0)                {                    myOutput.write(buffer, 0, length);                    length = myInput.read(buffer);                }                myOutput.flush();                myInput.close();                myOutput.close();            }        }catch (Exception e ){            Log.e(TAG, "file data1.bin ERROR!");        }    }    //创建文件夹    private void CreateFolder(String foldername) throws IOException{        try{            if(Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState())) {                File sd = Environment.getExternalStorageDirectory();                String path = sd.getPath() + "/App/" + foldername;                File file = new File(path);                if (!file.exists()){                    file.mkdir();                }            }        }catch (Exception e ){            Log.e(TAG, "create folder ERROR!");        }    }    public void saveBitmap(Bitmap bm, String dirPath, String picName) {        File f = new File( dirPath , picName);        if (f.exists()) {            f.delete();        }        try {            FileOutputStream out = new FileOutputStream(f);            bm.compress(Bitmap.CompressFormat.PNG, 90, out);            out.flush();            out.close();        } catch (FileNotFoundException e) {            // TODO Auto-generated catch block            e.printStackTrace();        } catch (IOException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }    }    //length用户要求产生字符串的长度    public static String getRandomString(int length){        String str="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";        Random random=new Random();        StringBuffer sb=new StringBuffer();        for(int i=0;i<length;i++){            int number=random.nextInt(62);            sb.append(str.charAt(number));        }        return sb.toString();    }    public static Bitmap getScaledBitmap(Bitmap m_img, int sx, int sy) {        Matrix matrix = new Matrix();        int imgW = m_img.getWidth();        int imgH = m_img.getHeight();        float fx = (float)imgW / sx;        float fy = (float)imgH / sy;        matrix.postScale(fx, fy);        Bitmap rst = Bitmap.createBitmap(m_img, 0, 0, m_img.getWidth(), m_img.getHeight(), matrix, true);        return rst;    }    // 获取当前目录下所有的mp4文件    public static Vector<String> getJPGFileName(String fileAbsolutePath) {        Vector<String> vecFile = new Vector<String>();        File file = new File(fileAbsolutePath);        File[] subFile = file.listFiles();        for (int iFileLength = 0; iFileLength < subFile.length; iFileLength++) {            // 判断是否为文件夹            if (!subFile[iFileLength].isDirectory()) {                String filename = subFile[iFileLength].getName();                // 判断是否为JPG结尾                if (filename.trim().toLowerCase().endsWith(".jpg")) {                    vecFile.add(filename);                }            }        }        return vecFile;    }    private Bitmap getDiskBitmap(String pathString) {        Bitmap bitmap = null;        try {            File file = new File(pathString);            if (file.exists()) {                bitmap = BitmapFactory.decodeFile(pathString);            }        } catch (Exception e) {            // TODO: handle exception        }        return bitmap;    }

// 获取当前目录下所有的jpg文件    public static Vector<String> getJPGFileName(String fileAbsolutePath, Boolean isFolder) {        Vector<String> vecFile = new Vector<String>();        File file = new File(fileAbsolutePath);        File[] subFile = file.listFiles();        for (int iFileLength = 0; iFileLength < subFile.length; iFileLength++) {            if ( !isFolder ){                // 判断是否为文件夹                if (!subFile[iFileLength].isDirectory()) {                    String filename = subFile[iFileLength].getName();                    // 判断是否为JPG结尾                    if (filename.trim().toLowerCase().endsWith(".jpg")) {                        vecFile.add(filename);                    }                }            }else{                if (subFile[iFileLength].isDirectory()) {                    String filename = subFile[iFileLength].getName();                    vecFile.add(filename);                }            }        }        return vecFile;    }

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