安卓：OpenCV的：imwrite总是返回false并没有写 [英] Android: OpenCV: imwrite always returns false and fails to write

问题描述

使用此code的工作，但在Android 4.2和OpenCV 2.4.4失败，但我不知道为什么。任何人都可以摆脱它的任何光线下我吗？

This code used to work but on Android 4.2 and OpenCV 2.4.4 it fails, but I don't know why. Can anyone shed any light on it for me?

感谢您的帮助。

巴兹

public void SaveImage (Mat mat) {
  Mat mIntermediateMat = new Mat();

  Imgproc.cvtColor(mRgba, mIntermediateMat, Imgproc.COLOR_RGBA2BGR, 3);

  File path = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES);
  String filename = "barry.png";
  File file = new File(path, filename);

  Boolean bool = null;
  filename = file.toString();
  bool = Highgui.imwrite(filename, mIntermediateMat);

  if (bool == true)
    Log.d(TAG, "SUCCESS writing image to external storage");
  else
    Log.d(TAG, "Fail writing image to external storage");
  }

布尔回来虚假每次。文件路径/名称是理所应当的（存储/模拟/ 0 /图片/ barry.png）的用户＃0和目录的图片是存在的。

bool comes back false every time. The file path/name is as it should be ("storage/emulated/0/Pictures/barry.png") for User #0 and the directory Pictures is there.

是什么让imwrite返回false？

What can make imwrite return false?

我可以在垫子转换为BMP和保存它自己（我在非OpenCV的应用程序做其他地方），但由于Highgui.imwrite是存在的，这code使用时，我在写至2.4工作2.0和测试在Android 3.x中，我想，如果我可以使用它。

I could convert the mat to a bmp and save it myself (which I do elsewhere in a non-OpenCV app) but since Highgui.imwrite is there, and this code used to work when I was writing to 2.4.0 and testing on Android 3.x, I'd like to use it if I can.

感谢

巴兹

推荐答案

我简直不敢相信。 [facepalm]。

I can't believe it. [facepalm].

添加到您的清单文件巴里：

Add this to your manifest file Barry:

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

会有人来拍我好吗？我设法从清单中删除写权限所以真的不应该有任何的惊喜，它不会写......

Would somebody come and slap me please? I managed to remove the write permission from the manifest so really there shouldn't be any surprise that it wouldn't write...

卫生署。

巴里

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