@Override public int getColumnIndex(final String name) {
			return mAppendSummaryColumn && DocumentsContract.Root.COLUMN_SUMMARY.equals(name) ? super.getColumnCount() : super.getColumnIndex(name);
		}
Documents provider for accessing files in / outside Island.

Created by Oasis on 2017/8/29.
fileprovider/src/main/java/com/oasisfeng/island/fileprovider/ExternalStorageProviderProxy.java