android - 最终修复 Android 使用内置摄像头时在图库中复制照片的错误

Question

这是解决 Android 复制照片问题的最终解决方案。在 2.3(有错误)、4.x(没有错误)和 5.x(也有错误)上对其进行了测试。

问题是照片保存有两种格式:通常一种是timestamp.jpg，另一种是full_date_and_time.jpg；有时在同一个文件夹中，有时在不同的文件夹中。例如，“1430910805600.jpg”和“2015-05-06 11.14.00.jpg”。最糟糕的是，一个无法转换为另一个。

Answer 1

修复使用的代码是我在 StackOverflow 的一些问题中找到的，也是我自己的改进。

首先，您使用用于创建 Intent 的 URI 获取图像，获取其添加日期，然后将其删除。然后，您获取添加到图库中的最后一张图像，并与原始图像的添加日期进行比较。如果差异小于一秒(通常小于 10 毫秒)，我会删除它。

这是用来拍照的代码:

private static final int EXTCAMERA_RETURN = 1234324334;
private String imageFN; // stored globally but could be a parameter
...
ContentValues values = new ContentValues();
values.put(MediaStore.Images.Media.TITLE, "tctemp.jpg");
values.put (MediaStore.Images.Media.IS_PRIVATE, 1);
capturedImageURI = getContentResolver().insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values);
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);  
intent.putExtra(MediaStore.EXTRA_OUTPUT, capturedImageURI);  
startActivityForResult(intent, EXTCAMERA_RETURN);

这是抓拍的照片:

 String[] projection = {MediaStore.Images.Media.DATA, BaseColumns._ID, MediaStore.Images.Media.DATE_ADDED}; 
 Cursor cursor = managedQuery(capturedImageURI, projection, null, null, null); 

 cursor.moveToFirst();
 String capturedImageFilePath = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA));
 long date = cursor.getLong(cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATE_ADDED));
 if (capturedImageFilePath == null || !AndroidUtils.copyFile(capturedImageFilePath,imageFN,cameraType == CAMERA_NATIVE_NOCOPY))
    resultCode = RESULT_OK+1; // error
 else
 {
    autoRotatePhoto(imageFN);
    getContentResolver().delete(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, BaseColumns._ID + "=" + cursor.getString(cursor.getColumnIndexOrThrow(BaseColumns._ID)), null);
    try {new File(capturedImageFilePath).delete();} catch (Exception e) {} // on android 2.3 the code above does not work, so we just ensure that we delete the file
    removeLastImageFromGallery(date);
 }

如果差异小于一秒，此代码用于删除画廊的最后一张照片

 private void removeLastImageFromGallery(long orig)
 {
    try
    {
       final String[] imageColumns = { MediaStore.Images.Media._ID, MediaStore.Images.Media.DATE_ADDED };
       final String imageOrderBy = MediaStore.Images.Media._ID+" DESC";
       Cursor imageCursor = managedQuery(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, imageColumns, null, null, imageOrderBy);
       if (imageCursor.moveToFirst())
       {
          long last = imageCursor.getLong(imageCursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATE_ADDED));
          int id = imageCursor.getInt(imageCursor.getColumnIndex(MediaStore.Images.Media._ID));
          long dif = Math.abs(orig-last);
          if (dif < 1) // 1 second - usually is less than 10ms
             getContentResolver().delete(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, MediaStore.Images.Media._ID + "=?", new String[]{ Long.toString(id) } );
       }
    }
    catch (Exception e)
    {
       AndroidUtils.handleException(e, false);
    }
}

最后，自动旋转的代码是:

public static void autoRotatePhoto(String imagePath)
{
   try
   {
      File f = new File(imagePath);
      ExifInterface exif = new ExifInterface(f.getPath());
      int orientation = exif.getAttributeInt(ExifInterface.TAG_ORIENTATION, ExifInterface.ORIENTATION_NORMAL);
      AndroidUtils.debug(imagePath+" -> "+orientation);

      int angle = 0;
      switch (orientation)
      {
         case ExifInterface.ORIENTATION_ROTATE_90: angle  = 90;  break;
         case ExifInterface.ORIENTATION_ROTATE_180: angle = 180; break;
         case ExifInterface.ORIENTATION_ROTATE_270: angle = 270; break;
         default: return;
      }

      Matrix mat = new Matrix();
      mat.postRotate(angle);
      BitmapFactory.Options options = new BitmapFactory.Options();
      options.inSampleSize = 2;

      Bitmap bmp = BitmapFactory.decodeStream(new FileInputStream(f), null, options);
      Bitmap bitmap = Bitmap.createBitmap(bmp, 0, 0, bmp.getWidth(), bmp.getHeight(), mat, true);
      FileOutputStream out = new FileOutputStream(f);
      bitmap.compress(Bitmap.CompressFormat.JPEG, 85, out);
      out.close();
      AndroidUtils.debug("auto-rotated "+imagePath);
   }
   catch (Exception e)
   {
      AndroidUtils.handleException(e, false);
   }
}

AndroidUtils.debug 和 handleException 用于转储 Log 和打印异常。复制文件显示在这里:

public static boolean copyFile(String in, String out, boolean deleteOriginal)
{
   try
   {
      byte[] buf = new byte[4096];
      FileInputStream fin = new FileInputStream(in);
      FileOutputStream fout = new FileOutputStream(out);
      int r;
      while ((r=fin.read(buf,0,buf.length)) > 0)
         fout.write(buf,0,r);
      fin.close();
      fout.close();
      if (deleteOriginal)
         new File(in).delete();
      return true;
   }
   catch (Exception e)
   {
      handleException(e,false);
      return false;
   }
}