使用Android原生相机停止保存照片

Question

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,其他照片副本保存到DCIM文件夹.

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);

如何防止将其他图像副本保存到DCIM文件夹？

非常感谢

Answer 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.然后检查上次修改时间是否在最后几秒内.您可能还需要检查相机存储图像的位置的确切位置.

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;
        }

    }

Answer 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.我更喜欢用这种方式:

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副本.我用上面的代码找到最后拍摄的照片.

注意:请勿cursor.close();在使用managedQuery后使用,将光标留给Android系统进行管理,不要调用它.你可以看到managedQuery()

注意2:不推荐使用managedQuery方法,应该避免使用,而是实现CursorLoaders.

Answer 3

检查这个代码..

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());
} 

这就是该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());   
        }         
    }       

}