Access Storage In Android KITKAT

AccessStorageApi

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;

import android.content.ContentUris;
import android.content.Context;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Build;
import android.os.Environment;
import android.provider.DocumentsContract;
import android.provider.MediaStore;

public class AccessStorageApi {

	public static Bitmap loadPrescaledBitmap(String filename) throws IOException {
		  // Facebook image size
		  final int IMAGE_MAX_SIZE = 630;

		  File file = null;
		  FileInputStream fis;

		  BitmapFactory.Options opts;
		  int resizeScale;
		  Bitmap bmp;

		  file = new File(filename);

		  // This bit determines only the width/height of the bitmap without loading the contents
		  opts = new BitmapFactory.Options();
		  opts.inJustDecodeBounds = true;
		  fis = new FileInputStream(file);
		  BitmapFactory.decodeStream(fis, null, opts);
		  fis.close();

		  // Find the correct scale value. It should be a power of 2
		  resizeScale = 1;

		  if (opts.outHeight > IMAGE_MAX_SIZE || opts.outWidth > IMAGE_MAX_SIZE) {
		    resizeScale = (int)Math.pow(2, (int) Math.round(Math.log(IMAGE_MAX_SIZE / (double) Math.max(opts.outHeight, opts.outWidth)) / Math.log(0.5)));
		  }

		  // Load pre-scaled bitmap
		  opts = new BitmapFactory.Options();
		  opts.inSampleSize = resizeScale;
		  fis = new FileInputStream(file);
		  bmp = BitmapFactory.decodeStream(fis, null, opts);

		  fis.close();

		  return bmp;
		} 
	
	/**
	 * Get a file path from a Uri. This will get the the path for Storage Access
	 * Framework Documents, as well as the _data field for the MediaStore and
	 * other file-based ContentProviders.
	 *
	 * @param context The context.
	 * @param uri The Uri to query.
	 * @author paulburke
	 */
	public static String getPath(final Context context, final Uri uri) {

	    final boolean isKitKat = Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT;

	    // DocumentProvider
	    if (isKitKat && DocumentsContract.isDocumentUri(context, uri)) {
	        // ExternalStorageProvider
	        if (isExternalStorageDocument(uri)) {
	            final String docId = DocumentsContract.getDocumentId(uri);
	            final String[] split = docId.split(":");
	            final String type = split[0];

	            if ("primary".equalsIgnoreCase(type)) {
	                return Environment.getExternalStorageDirectory() + "/" + split[1];
	            }

	            // TODO handle non-primary volumes
	        }
	        // DownloadsProvider
	        else if (isDownloadsDocument(uri)) {

	            final String id = DocumentsContract.getDocumentId(uri);
	            final Uri contentUri = ContentUris.withAppendedId(
	                    Uri.parse("content://downloads/public_downloads"), Long.valueOf(id));

	            return getDataColumn(context, contentUri, null, null);
	        }
	        // MediaProvider
	        else if (isMediaDocument(uri)) {
	            final String docId = DocumentsContract.getDocumentId(uri);
	            final String[] split = docId.split(":");
	            final String type = split[0];

	            Uri contentUri = null;
	            if ("image".equals(type)) {
	                contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
	            } else if ("video".equals(type)) {
	                contentUri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI;
	            } else if ("audio".equals(type)) {
	                contentUri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
	            }

	            final String selection = "_id=?";
	            final String[] selectionArgs = new String[] {
	                    split[1]
	            };

	            return getDataColumn(context, contentUri, selection, selectionArgs);
	        }
	    }
	    // MediaStore (and general)
	    else if ("content".equalsIgnoreCase(uri.getScheme())) {
	        return getDataColumn(context, uri, null, null);
	    }
	    // File
	    else if ("file".equalsIgnoreCase(uri.getScheme())) {
	        return uri.getPath();
	    }

	    return null;
	}

	/**
	 * Get the value of the data column for this Uri. This is useful for
	 * MediaStore Uris, and other file-based ContentProviders.
	 *
	 * @param context The context.
	 * @param uri The Uri to query.
	 * @param selection (Optional) Filter used in the query.
	 * @param selectionArgs (Optional) Selection arguments used in the query.
	 * @return The value of the _data column, which is typically a file path.
	 */
	public static String getDataColumn(Context context, Uri uri, String selection,
	        String[] selectionArgs) {

	    Cursor cursor = null;
	    final String column = "_data";
	    final String[] projection = {
	            column
	    };

	    try {
	        cursor = context.getContentResolver().query(uri, projection, selection, selectionArgs,
	                null);
	        if (cursor != null && cursor.moveToFirst()) {
	            final int column_index = cursor.getColumnIndexOrThrow(column);
	            return cursor.getString(column_index);
	        }
	    } finally {
	        if (cursor != null)
	            cursor.close();
	    }
	    return null;
	}


	/**
	 * @param uri The Uri to check.
	 * @return Whether the Uri authority is ExternalStorageProvider.
	 */
	public static boolean isExternalStorageDocument(Uri uri) {
	    return "com.android.externalstorage.documents".equals(uri.getAuthority());
	}

	/**
	 * @param uri The Uri to check.
	 * @return Whether the Uri authority is DownloadsProvider.
	 */
	public static boolean isDownloadsDocument(Uri uri) {
	    return "com.android.providers.downloads.documents".equals(uri.getAuthority());
	}

	/**
	 * @param uri The Uri to check.
	 * @return Whether the Uri authority is MediaProvider.
	 */
	public static boolean isMediaDocument(Uri uri) {
	    return "com.android.providers.media.documents".equals(uri.getAuthority());
	}

}

Handling secondary volumes for External storage provider

       if ("primary".equalsIgnoreCase(type)) {
                return Environment.getExternalStorageDirectory() + "/" + split[1];
            } else {
                //Below logic is how External Storage provider build URI for documents
                StorageManager mStorageManager = (StorageManager) getActivity().getSystemService(Context.STORAGE_SERVICE);
                final StorageVolume[] volumes = mStorageManager.getVolumeList();
                for (StorageVolume volume : volumes) {
                    final boolean mounted = Environment.MEDIA_MOUNTED.equals(volume.getState())
                        || Environment.MEDIA_MOUNTED_READ_ONLY.equals(volume.getState());
                    //if the media is not mounted, we need not get the volume details
                    if (!mounted) continue;
                    //Primary storage is already handled.
                    if (volume.isPrimary() && volume.isEmulated()) continue;
                    //Build the actual path based on the uuid
                    if (volume.getUuid() != null && volume.getUuid().equals(type)) {
                        return volume.getPath() + "/" +split[1];
                    }
                }
            }

how to get pdf file path when the i get the authority is 'com.google.android.apps.docs.storage'