Retrieve images of particular folder in Android

问题

In my application I created the GridView to show the image from particular folder. The issue is that I want to retrieve images from the DCIM/100ANDRO folder. Which type of arguments should be passed through query to retrieve such type of images? Please provide me solution.

I am using following code to retrieve which gives me images captured by camera

        //importing only camera images and storing in ArrayList of class Images     type
        String[] projection = {
        MediaStore.Images.Media._ID, MediaStore.Images.Media.BUCKET_DISPLAY_NAME,
        MediaStore.Images.Media.DISPLAY_NAME
        };
        String selection = MediaStore.Images.Media.BUCKET_DISPLAY_NAME + " = ?";
        String[] selectionArgs = new String[] {
            "Camera"
        };

        Cursor mImageCursor = getContentResolver().query(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, projection, selection, selectionArgs, null ); 

        if (mImageCursor != null)
        {

            mImageCursor.moveToFirst();

            for (int i = 0; i < mImageCursor.getCount(); i++)
            {
                Images im=new Images();
                eachImageView=new ImageView(this);
                int imageId = mImageCursor.getInt((mImageCursor.getColumnIndex( MediaStore.Images.Media._ID)));
                Bitmap bm = MediaStore.Images.Thumbnails.getThumbnail(getContentResolver(), 
                    imageId, MediaStore.Images.Thumbnails.MINI_KIND, null);
                im.setBitmap(bm);
                eachImageView.setImageBitmap(bm);
                im.setImageView(eachImageView);

                arrayOfImages.add(im);

                mImageCursor.moveToNext();
            }
        }

Suggestion will be appreciated!

回答1:

File folder = new File(Environment.getExternalStorageDirectory().toString() + "/Folder Name/");
folder.mkdirs();
File[] allFiles = folder.listFiles(new FilenameFilter() {
    public boolean accept(File dir, String name) {
        return (name.endsWith(".jpg") || name.endsWith(".jpeg") || name.endsWith(".png"));
    }
});

回答2:

First, assert the path that you are accessing and then use Bitmap.DecodePath(path) to load the bitmap. Try this out.

File path = new File(Environment.getExternalStorageDirectory(),"DCIM/100ANDRO");
if(path.exists())
{
    String[] fileNames = path.list();
}
for(int i = 0; i < filename.length; i++)
{
     Bitmap mBitmap = Bitmap.decodeFile(path.getPath()+"/"+ fileNames[i]);
     ///Now set this bitmap on imageview
} 

回答3:

Once check this one

 File sdcardPath = new File(Environment.getExternalStorageDirectory()
    .getPath() + "/100ANDRO"); 
   Log.v(sdcardPath.getPath());

Check if this prints the correct path which you require If sdcardPath is not null then try the following logic

int imageCount = sdcardPath.listFiles().length;
  for (int count = 0; count < imageCount - 1; count++) {
   ImageView eachImageView= new ImageView(this);
   Bitmap bmp = BitmapFactory.decodeFile(sdcardPath.listFiles()[count].getAbsolutePath());
   eachImageView.setImageBitmap(bmp);

回答4:

If I understand you correctly, you wish to have your GridView show images from a certain folder on the device.

In your query, you use the following Uri: MediaStore.Images.Media.EXTERNAL_CONTENT_URI. This will search for images everywhere on the "primary" external storage. If you only want to search in a specific folder - use a specific Uri.

You can create a File object with the path of your location, then create a Uri from that File. For example:

File myFile = new File("/scard/myfolder");
Uri myUri = Uri.fromFile(myFile);

Then in your query for images, you can use this Uri instead. That is to say you would have:

Cursor mImageCursor = getContentResolver().query(myUri, projection, selection, selectionArgs, null );

Then you could still handle the returned cursor in the same way, as the format of data is the same. However, the returned data would only contain images from your desired folder.

Hope this helps :)

来源：https://stackoverflow.com/questions/14858694/retrieve-images-of-particular-folder-in-android