Bitmap的一些操作

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/**
   * 旋转图片
   *
   * @param bmp
   * @param degrees
   * @return
   */
   public Bitmap rotateIMG(Bitmap bmp, float degrees) {
       Bitmap bitmap = null;

       Matrix matrix = new Matrix();
       matrix.setRotate(degrees);
       bitmap = Bitmap.createBitmap(bmp, 0, 0, bmp.getWidth(),
               bmp.getHeight(), matrix, true);

       return bitmap;

}

/* 压缩到指定宽高 */
   private Bitmap getBitmapFromFile(String pathName, int width, int height) {
       BitmapFactory.Options opts = new BitmapFactory.Options();
       opts.inJustDecodeBounds = true;
       Bitmap src = BitmapFactory.decodeFile(pathName, opts);
       opts.outWidth = width;
       opts.outHeight = height;
       opts.inJustDecodeBounds = false;
       src = BitmapFactory.decodeFile(pathName, opts);
       Toast.makeText(this, src.getWidth() + " " + src.getHeight(),
               Toast.LENGTH_SHORT).show();

       int w = src.getWidth();
       int h = src.getHeight();
       float scaleWidth = ((float) width) / w;
       float scaleHeight = ((float) height) / h;
       Matrix matrix = new Matrix();
       matrix.postScale(scaleWidth, scaleHeight);
       Bitmap bmp = Bitmap.createBitmap(src, 0, 0, w, h, matrix, true);
       Toast.makeText(this, bmp.getWidth() + " " + bmp.getHeight(),
               Toast.LENGTH_SHORT).show();

       return bmp;
   }

/**
   * 得到文件路径
   *
   * @return
   */
   private File getFile() {
       File file = new File("/sdcard/epd/sc.txt");
       try {
           boolean sdCardExist = Environment.getExternalStorageState().equals(
                   android.os.Environment.MEDIA_MOUNTED);
           if (sdCardExist) {
               String fileName = "epd";
               String sdPath = Environment.getExternalStorageDirectory()
                       .getPath();
               File tempFile = new File(sdPath + File.separator + fileName);
               if (!tempFile.exists()) {
                   tempFile.mkdirs();
               }
               file = new File(sdPath + File.separator + fileName
                       + File.separator + "sc" + ".txt");
               /*
               * if (file.exists()) { file.delete(); file.createNewFile(); }
               */
           }
       } catch (Exception e) {
           e.printStackTrace();
       }
       return file;
   }

/*文件保存*/

FileOutputStream fos = null;
       try {
           File file = getFile();
           fos = new FileOutputStream(file, false);
           fos.write(buffer);
           fos.flush();
       } catch (FileNotFoundException e) {
           // TODO Auto-generated catch block
           e.printStackTrace();
       } catch (IOException e) {
           // TODO Auto-generated catch block
           e.printStackTrace();
       } finally {
           try {
               if (fos != null)
                   fos.close();
           } catch (IOException e) {
               // TODO Auto-generated catch block
               e.printStackTrace();
           }
       }

/**
   * time:2015-07-06
   * 读取文件
   * @param path
   * @return
   */
   private byte[] getImageBytes() {
       byte[] buffer = null;
       File file = getFile();
       FileInputStream fis = null;
       try {
           fis = new FileInputStream(file);
           int lenght = fis.available();
           buffer = new byte[lenght];
           fis.read(buffer);
       } catch (FileNotFoundException e1) {
           // TODO Auto-generated catch block
           e1.printStackTrace();
       } catch (IOException e) {
           // TODO Auto-generated catch block
           e.printStackTrace();
       } finally {
           try {
               if (fis != null) {
                   fis.close();
               }
           } catch (IOException e) {
               // TODO Auto-generated catch block
               e.printStackTrace();
           }
       }
       return buffer;
   }

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