CWAC摄像头：为什么我的SimpleCameraHost saveImage很慢，我是不是做错了什么？ [英] CWAC Camera: why my SimpleCameraHost saveImage is so slow, am I doing something wrong?

问题描述

如何优化code的这一和平？
这需要有关 saveImage一分钟方法。

 类ObrolSimpleHost扩展SimpleCameraHost {
  私人最终的String [] = SCAN_TYPES {图像/ WEBP};
  私人上下文的背景下= NULL;  公共ObrolSimpleHost（上下文_ctxt）{
    超（_ctxt）;
    this.context = getActivity（）;
  }  @覆盖公共无效saveImage（PictureTransaction XACT，位图位图）{
    文件照片= getPhotoPath（）;
    如果（photo.exists（））{
      photo.delete（）;
    }
    尝试{
      FOS的FileOutputStream =新的FileOutputStream（photo.getPath（））;
      bitmap.com preSS（Bitmap.Com pressFormat.WEBP，70，FOS）;
      fos.flush（）;
      fos.getFD（）同步（）。
      如果（scanSavedImage（））{
        MediaScannerConnection.scanFile（背景下，新的String [] {photo.getPath（）}，SCAN_TYPES，NULL）;
      }
    }赶上（java.io.IOException异常五）{
      handleException（E）;
    }
  }  @覆盖公共无效saveImage（PictureTransaction XACT，字节[]图像）{
    // 没做什么
  }
}
 

我打电话 ObrolSimpleHost 从CameraFragment：

  PictureTransaction XACT =新PictureTransaction（和getHost（））;
xact.needBitmap（真）;
takePicture（XACT）;
 

解决方案

下面是我自己的答案。

其中 CommonsWare 提到和调整

问题修正位图之前通过 COM pression createScaledBitmap ：

 类ObrolSimpleHost扩展SimpleCameraHost {
  私人最终的String [] = SCAN_TYPES {图像/+ imputType};
  私人上下文的背景下= NULL;  公共ObrolSimpleHost（上下文_ctxt）{
    超（_ctxt）;
    this.context = getActivity（）;
  }  @覆盖公共无效saveImage（PictureTransaction XACT，位图位图）{
    文件照片= getPhotoPath（）;
    字符串路径= photo.getPath（）代替（JPG，imputType）。
    如果（photo.exists（））{
      photo.delete（）;
    }    / **
     *调整大小的位图，所以保存COM pression一些毫秒
     * http://stackoverflow.com/questions/17839388/creating-a-scaled-bitmap-with-createscaledbitmap-in-android
     * /
    最终诠释MAXSIZE = 960;
    INT outWidth;
    INT outHeight;
    INT inWidth = bitmap.getWidth（）;
    INT inHeight = bitmap.getHeight（）;
    如果（inWidth＆GT; inHeight）{
      outWidth = MAXSIZE;
      outHeight =（inHeight * MAXSIZE）/ inWidth;
    }其他{
      outHeight = MAXSIZE;
      outWidth =（inWidth * MAXSIZE）/ inHeight;
    }
    位图resizedBitmap = Bitmap.createScaledBitmap（位图，outWidth，outHeight，FALSE）;    尝试{
      FOS的FileOutputStream =新的FileOutputStream（路径）;
      如果（imputType.equals（JPEG））{
        resizedBitmap.com preSS（Bitmap.Com pressFormat.JPEG，70，FOS）;
      }其他{
        resizedBitmap.com preSS（Bitmap.Com pressFormat.WEBP，70，FOS）;
      }
      fos.flush（）;
      fos.getFD（）同步（）。
      如果（scanSavedImage（））{
        MediaScannerConnection.scanFile（背景下，新的String [] {photo.getPath（）}，SCAN_TYPES，NULL）;
      }
    }赶上（java.io.IOException异常五）{
      handleException（E）;
    }
    。EventBus.getDefault（）postSticky（新活动preparingBitmapEvent（路径）。）;
    getActivity（）完成（）。
  }  @覆盖公共无效saveImage（PictureTransaction XACT，字节[]图像）{
    // 没做什么
  }
}
 

除了标准的位图的使用符合的 JNI

在我的情况，我要尝试固醇-的WebP

How to optimize this peace of code? It takes about a minute on saveImage method.

class ObrolSimpleHost extends SimpleCameraHost {
  private final String[] SCAN_TYPES = {"image/webp"};
  private Context context = null;

  public ObrolSimpleHost(Context _ctxt) {
    super(_ctxt);
    this.context = getActivity();
  }

  @Override public void saveImage(PictureTransaction xact, Bitmap bitmap) {
    File photo = getPhotoPath();
    if (photo.exists()) {
      photo.delete();
    }
    try {
      FileOutputStream fos = new FileOutputStream(photo.getPath());
      bitmap.compress(Bitmap.CompressFormat.WEBP, 70, fos);
      fos.flush();
      fos.getFD().sync();
      if (scanSavedImage()) {
        MediaScannerConnection.scanFile(context, new String[]{photo.getPath()}, SCAN_TYPES, null);
      }
    } catch (java.io.IOException e) {
      handleException(e);
    }
  }

  @Override public void saveImage(PictureTransaction xact, byte[] image) {
    // do nothing
  }
}

I am calling ObrolSimpleHost from CameraFragment:

PictureTransaction xact = new PictureTransaction(getHost());
xact.needBitmap(true);
takePicture(xact);

解决方案

Here is my own answer.

Fixed issues which CommonsWare mentioned and resize bitmap before compression by createScaledBitmap:

class ObrolSimpleHost extends SimpleCameraHost {
  private final String[] SCAN_TYPES = {"image/" + imputType};
  private Context context = null;

  public ObrolSimpleHost(Context _ctxt) {
    super(_ctxt);
    this.context = getActivity();
  }

  @Override public void saveImage(PictureTransaction xact, Bitmap bitmap) {
    File photo = getPhotoPath();
    String path = photo.getPath().replace("jpg", imputType);
    if (photo.exists()) {
      photo.delete();
    }

    /**
     * Resizing bitmap, so save some ms in compression
     * http://stackoverflow.com/questions/17839388/creating-a-scaled-bitmap-with-createscaledbitmap-in-android
     */
    final int maxSize = 960;
    int outWidth;
    int outHeight;
    int inWidth = bitmap.getWidth();
    int inHeight = bitmap.getHeight();
    if(inWidth > inHeight){
      outWidth = maxSize;
      outHeight = (inHeight * maxSize) / inWidth;
    } else {
      outHeight = maxSize;
      outWidth = (inWidth * maxSize) / inHeight;
    }
    Bitmap resizedBitmap = Bitmap.createScaledBitmap(bitmap, outWidth, outHeight, false);

    try {
      FileOutputStream fos = new FileOutputStream(path);
      if (imputType.equals("jpeg")) {
        resizedBitmap.compress(Bitmap.CompressFormat.JPEG, 70, fos);
      } else {
        resizedBitmap.compress(Bitmap.CompressFormat.WEBP, 70, fos);
      }
      fos.flush();
      fos.getFD().sync();
      if (scanSavedImage()) {
        MediaScannerConnection.scanFile(context, new String[]{photo.getPath()}, SCAN_TYPES, null);
      }
    } catch (java.io.IOException e) {
      handleException(e);
    }
    EventBus.getDefault().postSticky(new Events.PreparingBitmapEvent(path));
    getActivity().finish();
  }

  @Override public void saveImage(PictureTransaction xact, byte[] image) {
    // do nothing
  }
}

Instead of standard bitmap use other library which build with JNI

In my case I am going to try Roid-WebP

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