How to grant temporary access to custom content provider using FLAG_GRANT_READ_URI_PERMISSION

I am trying to query custom content provider(App A) from another app(App B).

I can do that when there is no permission protection for content provider. Specifically, I build custom content provider on App A and sent an intent containing the URI to App B. Here is intent-sending part in App A.

class InsertOnClickListener implements OnClickListener{        
        public void onClick(View v) {
            ContentValues values = new ContentValues();
            values.put(DataBaseConfiguation.TableConfiguation.USER_NAME, "Jack");
            Uri uri = getContentResolver().insert(DataBaseConfiguation.TableConfiguation.CONTENT_URI, values);
            System.out.println("uri------------------->" + uri);
            // the uri above should be like "content://com.catking.contentprovider.MyContentProvider/user"
            Uri uri2 = Uri.parse("content://com.catking.contentprovider.MyContentProvider/user");
              Cursor c = managedQuery(uri2, null, null, null, null);
              String sendvalue = null;
               if (c.moveToFirst()) {
                  do{
                     System.out.println("User name:"+c.getString(c.getColumnIndex(DataBaseConfiguation.TableConfiguation.USER_NAME)).toString());               
                     sendvalue = c.getString(c.getColumnIndex(DataBaseConfiguation.TableConfiguation.USER_NAME)).toString();
                  } while (c.moveToNext());
               }
            Intent sendIntent = new Intent();
            sendIntent.setClassName("com.android.web", "com.android.web.Provid");
            sendIntent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
            sendIntent.putExtra("name", uri2.toString());
            sendIntent.setType("text/plain");
            startActivity(sendIntent);
        }
}

followed by manifest file of App A.

<application
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_nam