android - 拍摄相机 Intent 照片后删除图库图像

Question

我知道这个问题已经以多种不同的方式提出，但我似乎仍然无法从默认文件夹中删除图库图像。我已将文件正确保存到 SD 卡，我可以正常删除该文件，但不会删除文件夹 Camera 下显示的默认图库图像文件。

我希望在返回 Activity 后删除该图像，因为该文件已存储在 /Coupon2 下的 SD 卡上。

有什么建议吗？

public void startCamera() {
    Log.d("ANDRO_CAMERA", "Starting camera on the phone...");

    mManufacturerText = (EditText) findViewById(R.id.manufacturer);
    String ManufacturerText = mManufacturerText.getText().toString();
    String currentDateTimeString = new Date().toString();

    Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
    File filedir = new File(Environment.getExternalStorageDirectory()+"/Coupon2");
    filedir.mkdirs();

    File file = new File(Environment.getExternalStorageDirectory()+"/Coupon2", ManufacturerText+"-test.png");
    outputFileUri = Uri.fromFile(file);
    intent.putExtra(MediaStore.EXTRA_OUTPUT, outputFileUri);

    startActivityForResult(intent, CAMERA_PIC_REQUEST);
}

protected void onActivityResult(int requestCode, int resultCode, Intent data) {  
    super.onActivityResult(requestCode, resultCode, data);
    if (requestCode == CAMERA_PIC_REQUEST && resultCode == -1) {  
        Intent intent = new Intent("com.android.camera.action.CROP");
        intent.putExtra("crop", "true");
        intent.putExtra("scale", "true");

        intent.putExtra("return-data", false);
        intent.setDataAndType(outputFileUri, "image/*");
        intent.putExtra(MediaStore.EXTRA_OUTPUT, outputFileUri);
        startActivityForResult(intent, CAMERA_CROP_REQUEST);
    }else { 
        SetImage();
        saveState();
    }
}

Answer 1

我的应用程序要求我调用 Intent 拍照。照片不能在图库中，而必须在 SD 卡上的特定目录中。

最初我只是使用了 EXTRA_OUTPUT，但我很快发现了以下内容: - 有些设备完全使用它并跳过图库。 - 有些设备完全忽略它，只使用图库。 - 有些设备真的很糟糕，将全尺寸图像保存到画廊，只将缩略图保存到我想要的位置。 (HTC你知道你是谁......)

所以，我不能在完成后盲目地删除图库文件。最后添加的照片可能是也可能不是我要删除的照片。此外，我之后可能必须复制该文件替换我自己的文件。因为我的 Activity 是 2000 行，而且我的公司不希望发布我们所有的代码，所以我只发布了执行此操作所涉及的方法。希望这会有所帮助。

另外，我要声明，这是我的第一个 Android 应用程序。如果有一个我不知道的更好的方法来做到这一点，我不会感到惊讶，但这对我有用!

所以，这是我的解决方案:

首先，在我的应用程序上下文中，我定义一个变量如下:

public ArrayList<String> GalleryList = new ArrayList<String>();

接下来，在我的 Activity 中，我定义了一个方法来获取图库中所有照片的列表:

private void FillPhotoList()
{
   // initialize the list!
   app.GalleryList.clear();
   String[] projection = { MediaStore.Images.ImageColumns.DISPLAY_NAME };
   // intialize the Uri and the Cursor, and the current expected size.
   Cursor c = null; 
   Uri u = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
   //
   // Query the Uri to get the data path.  Only if the Uri is valid.
   if (u != null)
   {
      c = managedQuery(u, projection, null, null, null);
   }

   // If we found the cursor and found a record in it (we also have the id).
   if ((c != null) && (c.moveToFirst())) 
   {
      do 
      {
        // Loop each and add to the list.
        app.GalleryList.add(c.getString(0));
      }     
      while (c.moveToNext());
   }
}

这是为我的新图像返回唯一文件名的方法:

private String getTempFileString()
{
   // Only one time will we grab this location.
   final File path = new File(Environment.getExternalStorageDirectory(), 
         getString(getApplicationInfo().labelRes));
   //
   // If this does not exist, we can create it here.
   if (!path.exists())
   {
      path.mkdir();
   }
   //
   return new File(path, String.valueOf(System.currentTimeMillis()) + ".jpg").getPath();
}

我的 Activity 中有三个变量为我存储有关当前文件的信息。字符串(路径)、文件变量和该文件的 URI:

public static String sFilePath = ""; 
public static File CurrentFile = null;
public static Uri CurrentUri = null;

我从不直接设置这些，我只在文件路径上调用一个setter:

public void setsFilePath(String value)
{
   // We just updated this value. Set the property first.
   sFilePath = value;
   //
   // initialize these two
   CurrentFile = null;
   CurrentUri = null;
   //
   // If we have something real, setup the file and the Uri.
   if (!sFilePath.equalsIgnoreCase(""))
   {
      CurrentFile = new File(sFilePath);
      CurrentUri = Uri.fromFile(CurrentFile);
   }
}

现在我调用 Intent 拍照。

public void startCamera()
{
   Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
   // Specify the output. This will be unique.
   setsFilePath(getTempFileString());
   //
   intent.putExtra(MediaStore.EXTRA_OUTPUT, CurrentUri);
   //
   // Keep a list for afterwards
   FillPhotoList();
   //
   // finally start the intent and wait for a result.
   startActivityForResult(intent, IMAGE_CAPTURE);
}

完成后， Activity 返回，这是我的代码:

protected void onActivityResult(int requestCode, int resultCode, Intent data)
{
   if (requestCode == IMAGE_CAPTURE)
   {
      // based on the result we either set the preview or show a quick toast splash.
      if (resultCode == RESULT_OK)
      {
         // This is ##### ridiculous.  Some versions of Android save
         // to the MediaStore as well.  Not sure why!  We don't know what
         // name Android will give either, so we get to search for this
         // manually and remove it.  
         String[] projection = { MediaStore.Images.ImageColumns.SIZE,
                                 MediaStore.Images.ImageColumns.DISPLAY_NAME,
                                 MediaStore.Images.ImageColumns.DATA,
                                 BaseColumns._ID,};
         //    
         // intialize the Uri and the Cursor, and the current expected size.
         Cursor c = null; 
         Uri u = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
         //
         if (CurrentFile != null)
         {               
            // Query the Uri to get the data path.  Only if the Uri is valid,
            // and we had a valid size to be searching for.
            if ((u != null) && (CurrentFile.length() > 0))
            {
               c = managedQuery(u, projection, null, null, null);
            }
            //   
            // If we found the cursor and found a record in it (we also have the size).
            if ((c != null) && (c.moveToFirst())) 
            {
               do 
               {
                  // Check each area in the gallary we built before.
                  boolean bFound = false;
                  for (String sGallery : app.GalleryList)
                  {
                     if (sGallery.equalsIgnoreCase(c.getString(1)))
                     {
                        bFound = true;
                        break;
                     }
                  }
                  //       
                  // To here we looped the full gallery.
                  if (!bFound)
                  {
                     // This is the NEW image.  If the size is bigger, copy it.
                     // Then delete it!
                     File f = new File(c.getString(2));

                     // Ensure it's there, check size, and delete!
                     if ((f.exists()) && (CurrentFile.length() < c.getLong(0)) && (CurrentFile.delete()))
                     {
                        // Finally we can stop the copy.
                        try
                        {
                           CurrentFile.createNewFile();
                           FileChannel source = null;
                           FileChannel destination = null;
                           try 
                           {
                              source = new FileInputStream(f).getChannel();
                              destination = new FileOutputStream(CurrentFile).getChannel();
                              destination.transferFrom(source, 0, source.size());
                           }
                           finally 
                           {
                              if (source != null) 
                              {
                                 source.close();
                              }
                              if (destination != null) 
                              {
                                 destination.close();
                              }
                           }
                        }
                        catch (IOException e)
                        {
                           // Could not copy the file over.
                           app.CallToast(PhotosActivity.this, getString(R.string.ErrorOccured), 0);
                        }
                     }
                     //       
                     ContentResolver cr = getContentResolver();
                     cr.delete(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, 
                        BaseColumns._ID + "=" + c.getString(3), null);
                     break;                        
                  }
               } 
               while (c.moveToNext());
            }
         }
      }
   }      
}