Intent selectionintent = new Intent(Intent.ACTION_GET_CONTENT);
            selectionintent.setType("application/pdf");
            selectionintent.addCategory(Intent.CATEGORY_OPENABLE);
            PackageManager packageManager = getPackageManager();

            List activitiesPDF = packageManager.queryIntentActivities(selectionintent,
                    PackageManager.MATCH_DEFAULT_ONLY);
            boolean isIntentSafePDF = activitiesPDF.size() > 0;
            if (isIntentSafePDF)
                startActivityForResult(selectionintent, CODE_RESULT);
            else
                Toast.makeText(UpdateFileActivity.this, "Only select pdf files", Toast.LENGTH_SHORT).show();

if (requestCode == CODE_RESULT && resultCode == RESULT_OK) {
        Uri uri = data.getData();
        String file = uri.toString();
        File f = new File(file);
        if (file.startsWith("content://")) {
            Cursor cursor = null;
            try {
                cursor = getContentResolver().query(uri, null, null, null, null);
                if (cursor != null && cursor.moveToFirst()) {
                    displayName = cursor.getString(cursor.getColumnIndex(OpenableColumns.DISPLAY_NAME));
                }
            } finally {
                cursor.close();
            }
        } else if (file.startsWith("file://")) {
            displayName = f.getName();
        }
        filetext.setText(displayName);
    }