示例#1
0
  /**
   * <图片按比例大小压缩方法(根据路径获取图片并压缩)>
   *
   * @return 压缩后图片路径
   */
  public static String getImageScaleByPath(PicturePropertiesBean propertiesBean, Context context) {
    Bitmap bitmap = null;
    BitmapFactory.Options newOpts = new BitmapFactory.Options();
    // 开始读入图片,此时把options.inJustDecodeBounds 设回true了
    newOpts.inJustDecodeBounds = true;
    bitmap = BitmapFactory.decodeFile(propertiesBean.getSrcPath(), newOpts);
    int width = newOpts.outWidth;
    int height = newOpts.outHeight;
    //        float minHeight = 800f;//设置为主流手机分辨率800*480

    // 缩放比。由于是固定比例缩放,只用高或者宽其中一个数据进行计算即可
    int be = 1; // be=1表示不缩放
    if (height > width && width > propertiesBean.getWidth()) {
      // 如果宽度大的话根据宽度固定大小缩放
      be = (int) (newOpts.outWidth / propertiesBean.getWidth());
    } else if (width > height && height > propertiesBean.getHeight()) {
      // 如果高度高的话根据宽度固定大小缩放
      be = (int) (newOpts.outHeight / propertiesBean.getHeight());
    }
    if (be <= 0) be = 1;
    newOpts.inSampleSize = be; // 设置缩放比例
    newOpts.inJustDecodeBounds = false;
    bitmap = BitmapFactory.decodeFile(propertiesBean.getSrcPath(), newOpts);
    return compressImage(bitmap, context, propertiesBean); // 压缩好比例大小后再进行质量压缩
  }
示例#2
0
  /**
   * <质量压缩方法>
   *
   * @return 压缩后图片路径
   */
  private static String compressImage(
      Bitmap image, Context context, PicturePropertiesBean propertiesBean) {
    File file = null;
    if (image != null) {
      try {
        int degree = getExifOrientation(propertiesBean.getSrcPath());
        if (degree > 0) {
          Matrix matrix = new Matrix();
          matrix.setRotate(degree);
          Bitmap rotateBitmap =
              Bitmap.createBitmap(image, 0, 0, image.getWidth(), image.getHeight(), matrix, true);
          if (rotateBitmap != null) {
            image.recycle();
            image = rotateBitmap;
          }
        }

        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        // 质量压缩方法,这里100表示不压缩,把压缩后的数据存放到baos中
        image.compress(Bitmap.CompressFormat.JPEG, 100, baos);
        // 图片大于最大值,则压缩,否则不做任何操作
        if (baos.toByteArray().length > propertiesBean.getMaxSize()) {
          baos.reset();
          // 质量压缩方法,首先压缩options的压缩率
          image.compress(Bitmap.CompressFormat.JPEG, propertiesBean.getDefaultOption(), baos);
          // 循环判断如果压缩后图片是否大于200kb,大于继续压缩
          while (baos.toByteArray().length > propertiesBean.getMaxSize()) {
            baos.reset(); // 重置baos即清空baos
            // 这里压缩defaultOptions%,把压缩后的数据存放到baos中
            propertiesBean.setDefaultOption(
                propertiesBean.getDefaultOption() - propertiesBean.getOptions()); // 每次都减少option
            image.compress(Bitmap.CompressFormat.JPEG, propertiesBean.getDefaultOption(), baos);
          }
          while (baos.toByteArray().length < propertiesBean.getMinSize()) {
            baos.reset(); // 重置baos即清空baos
            // 这里压缩options%,把压缩后的数据存放到baos中
            propertiesBean.setDefaultOption(
                propertiesBean.getDefaultOption() + propertiesBean.getOptions()); // 每次都增加option
            image.compress(Bitmap.CompressFormat.JPEG, propertiesBean.getDefaultOption(), baos);
          }
        }
        file = new File(propertiesBean.getDestPath());
        FileOutputStream stream = new FileOutputStream(file);
        if (baos != null) {
          stream.write(baos.toByteArray());
          stream.flush();
        }
        stream.close();
        baos.close();
      } catch (FileNotFoundException e) {
        e.printStackTrace();
      } catch (IOException e) {
        e.printStackTrace();
      } finally {
        if (image != null) image.recycle();
      }
      return file.getPath();
    } else {
      return "";
    }
  }