停止使用 Android 原生相机保存照片

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【中文标题】停止使用 Android 原生相机保存照片【英文标题】:Stop saving photos using Android native camera 【发布时间】:2011-12-26 02:32:37 【问题描述】:

我正在使用原生 android 相机并将文件保存到我的应用程序数据文件夹 (/mnt/sdcard/Android/data/com.company.app/files/Pictures/)。同时将照片的另一个副本保存到 DCIM 文件夹中。

这是我的代码:

Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
String formattedImageName = getDateString() + ".jpg";
File image_file = new File(this.getExternalFilesDir(Environment.DIRECTORY_PICTURES), formattedImageName);
Uri imageUri = Uri.fromFile(image_file);
intent.putExtra(MediaStore.EXTRA_OUTPUT,imageUri);
startActivityForResult(intent, REQUEST_FROM_CAMERA);

如何防止将额外的图像副本保存到 DCIM 文件夹?

非常感谢

【问题讨论】:

嗨 chinthaka,下面的代码 FillPhotoList() 将收集画廊中的所有图像,而不是其他方法,movingCapturedImageFromDCIMtoMerchandising() 将通过 arralist 并找到最后捕获的图​​像并将其从 DCIM 中删除。跨度> 【参考方案1】:

您可以使用以下内容: 首先,我们通过检查哪个是最后修改的图像来获取最后保存的图像。然后检查最后修改时间是否在最后几秒钟内。您可能还需要检查相机存储图像的确切位置。

private boolean deleteLastFromDCIM() 

        boolean success = false;
        try 
            File[] images = new File(Environment.getExternalStorageDirectory()
                    + File.separator + "DCIM/Camera").listFiles();
            File latestSavedImage = images[0];
            for (int i = 1; i < images.length; ++i) 
                if (images[i].lastModified() > latestSavedImage.lastModified()) 
                    latestSavedImage = images[i];
                
            

                    // OR JUST Use  success = latestSavedImage.delete();
            success = new File(Environment.getExternalStorageDirectory()
                    + File.separator + "DCIM/Camera/"
                    + latestSavedImage.getAbsoluteFile()).delete();
            return success;
         catch (Exception e) 
            e.printStackTrace();
            return success;
        

    

【讨论】:

我在想,如果您的应用碰巧在手机上,而手机上没有将照片保存到该目录“DCIM/Camera/”,您会不会冒删除一些可怜用户的家庭相册的风险? @ Sixtoo 评论的解决方案是检查时间 - 如果文件在几秒钟前有最后修改 - 然后删除它【参考方案2】:

不幸的是,一些智能手机将图像保存在另一个文件夹中,例如 DCIM/100MEDIA。所以不能依赖这些解决方案。我更喜欢这样使用:

String[] projection = new String[] 
     MediaStore.Images.ImageColumns._ID,
     MediaStore.Images.ImageColumns.DATA,
     MediaStore.Images.ImageColumns.BUCKET_DISPLAY_NAME,
     MediaStore.Images.ImageColumns.DATE_TAKEN,
     MediaStore.Images.ImageColumns.MIME_TYPE;     

final Cursor cursor = managedQuery(
     MediaStore.Images.Media.EXTERNAL_CONTENT_URI,projection, null, null,
     MediaStore.Images.ImageColumns.DATE_TAKEN + " DESC"); 

if(cursor != null)
     cursor.moveToFirst();
     // you will find the last taken picture here and can delete that

我试图找出是否存在第二个副本并删除该副本。我使用上面的代码找到了最后一张照片。

注意:使用ma​​nagedQuery后不要使用cursor.close();,光标留给Android系统管理,不要调用。可以看managedQuery()

注意2:managedQuery 方法已被弃用,应避免使用,改为实现 CursorLoaders

【讨论】:

小心:这是非常非常危险的。在某些设备中,我们从应用中拍摄的图片不会复制到图库。在这种情况下,如果我们删除最后一张拍摄的照片,它会返回从相机应用程序拍摄的照片,所以我们最终会删除错误的照片,而不是从我们的应用程序拍摄的照片。因此,最重要的是,仅删除创建第二个副本的设备(例如 HTC One M8)从图库中拍摄的最后一张照片。 @whoami :我们如何知道第二个副本已创建?我在 Moto G4 Plus 上遇到了这个问题。 没办法,如果你使用相机意图..如果你不想创建第二个副本,你必须在你的应用程序中实现相机 API。【参考方案3】:

检查此代码..

private void FillPhotoList()   
    // initialize the list!    
    GalleryList.clear();    
    String[] projection =  MediaStore.Images.ImageColumns.DISPLAY_NAME ; 
    for(int i=0;i<projection.length;i++)
        Log.i("InfoLog","projection "+projection[0].toString());
    // intialize the Uri and the Cursor, and the current expected size.    
    Cursor c = null;     
    Uri u = MediaStore.Images.Media.EXTERNAL_CONTENT_URI; 
    Log.i("InfoLog","FillPhoto Uri u "+u.toString());
    // 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.         
            GalleryList.add(c.getString(0)); // adding all the images sotred in the mobile phone(Internal and SD card)

                    
        while (c.moveToNext());    
     
    Log.i(INFOLOG,"gallery size "+ GalleryList.size());
 

这就是方法发挥所有魔力的地方

 /** Method will check all the photo is the gallery and delete last captured and move it to the required folder.
 */
public void movingCapturedImageFromDCIMtoMerchandising()


    // 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.  

    for(int i=0;i<projection.length;i++)
        Log.i("InfoLog","on activityresult projection "+projection[i]);
    //+" "+projection[1]+" "+projection[2]+" "+projection[3] this will be needed if u remove the for loop
    Cursor c = null;          
    Uri u = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;       
    Log.i("InfoLog","on activityresult Uri u "+u.toString());

    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))        
                      
            //****u is the place from data will come and projection is the specified data what we want
            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 gallery we built before.     
                boolean bFound = false;               
                for (String sGallery : GalleryList)                  
                                      
                    if (sGallery.equalsIgnoreCase(c.getString(1)))  
                                          
                        bFound = true;
                        Log.i("InfoLog","c.getString(1) "+c.getString(1));
                        break;                    
                                       
                                   
                // To here we looped the full gallery.                   
                if (!bFound)     //the file which is newly created and it has to be deleted from the gallery              
                                     
                    // 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.      
                            ToastMaker.makeToast(this, "Error Occured", 0);   
                                              
                                       
                    //****deleting the file which is in the gallery                           
                    Log.i(INFOLOG,"imagePreORNext1 "+imagePreORNext);
                    Handler handler = new Handler();
                    //handler.postDelayed(runnable,300);
                    Log.i(INFOLOG,"imagePreORNext2 "+imagePreORNext);
                    ContentResolver cr = getContentResolver();       
                    cr.delete(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, BaseColumns._ID + "=" + c.getString(3), null);

                    break;                                          
                              
                        
            while (c.moveToNext());   
                 
           


【讨论】:

感谢您的回复。您认为我们可以在与 Picasa 同步之前删除 mediaStore 吗?你知道有什么方法可以停止将文件保存到 mediaStroe 吗? 你能告诉我这个“CurrentFile”是什么吗?我必须在哪里定义这个? 它是您提供给捕获图像的文件的名称 阿莫尔,这行得通吗?因为在保存重复的照片时,它会获得自己的文件名。我们无法改变这一点。 谢谢阿莫尔。终于可以删除媒体文件了。【参考方案4】:

Parth 的一个不错的解决方案。但这对于将图像保存在 DCIM/Camera 中的三星来说是件好事。一些手机 - 索尼爱立信、HTC 将它们保存在 DCIM/100MEDIA、DCIM/100ANDRO 等文件夹中,所以我稍微修改了代码:

 private boolean deleteLastFromDCIM() 
    boolean success = false;
    try            
        //Samsungs:
        File folder = new File(Environment.getExternalStorageDirectory() + File.separator + "DCIM/Camera");
        if(!folder.exists()) //other phones:
            File[] subfolders = new File(Environment.getExternalStorageDirectory() + File.separator + "DCIM").listFiles();
            for(File subfolder : subfolders)
                if(subfolder.getAbsolutePath().contains("100"))  
                    folder = subfolder;
                    break;
                
            
            if(!folder.exists())
                return false;
        

        File[] images = folder.listFiles();
        File latestSavedImage = images[0];
        for (int i = 1; i < images.length; ++i) 
            if (images[i].lastModified() > latestSavedImage.lastModified()) 
                latestSavedImage = images[i];
            
                    
        success = latestSavedImage.delete();
        return success;
     catch (Exception e) 
        e.printStackTrace();
        return success;
    


【讨论】:

这对我没有任何帮助。我的应用程序没有崩溃,但照片仍然存在。你能说明一下它的用法吗? 这确实为我删除了图像,但在图库应用程序中,我仍然会在图像所在的位置看到损坏的缩略图。 你们知道,这是一种解决方案,适用于特定手机上特定应用程序的特定情况。在不断变化的(我应该说是狂野的?)Android 世界中,没有什么是不变的而不是持久的。此外,并非每个发帖人都有时间为每个设备更新他的答案...【参考方案5】:

我在使用 Moto Z Force (7.1.1) 时遇到了类似的问题。我在意图上定义了MediaStore.EXTRA_OUTPUT,但仍然在相机目录中创建了一个重复文件。

我需要在其他设备上进行测试,但这是我针对此问题采取的一种方法。我没有尝试查找特定的相机目录,而是使用MediaStore.Images.ImageColumns.BUCKET_DISPLAY_NAME 位置。

这是我的代码 sn-p:

private void removeCameraDuplicate() 
    String[] proj = 
        MediaStore.Images.ImageColumns.DATA,
        MediaStore.Images.ImageColumns._ID ;

    String selection = MediaStore.Images.ImageColumns.BUCKET_DISPLAY_NAME + " = ? ";
    String[] selectionArgs = new String[]  "Camera" ;

    Cursor cursor = mActivity.getContentResolver().query(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, proj, selection, selectionArgs, MediaStore.Images.ImageColumns.DATE_TAKEN + " desc");

    if (cursor != null) 
        int idxPath = cursor.getColumnIndex(MediaStore.Images.ImageColumns.DATA);

        if (cursor.getCount() > 0 && idxPath > -1 && cursor.moveToFirst()) 
            File original = new File(mMediaPath);
            File cameraDupe = new File(cursor.getString(idxPath));
            if (original.exists() && cameraDupe.exists()) 
                LogUtils.LOGE("***> camera", "original " + original.length());
                LogUtils.LOGE("***> camera", "original " + original.lastModified());

                LogUtils.LOGE("***> camera", "duplicate " + cameraDupe.length());
                LogUtils.LOGE("***> camera", "duplicate " + cameraDupe.lastModified());

                if (original.length() == cameraDupe.length() && original.lastModified() == cameraDupe.lastModified()) 
                    if (cameraDupe.delete()) 
                        LogUtils.LOGE("***> camera", "duplicate deleted");
                    
                
            
        
        cursor.close();
    

【讨论】:

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