@Override public String getColumnName(final int index) {
			return mAppendSummaryColumn && index == super.getColumnCount() ? DocumentsContract.Root.COLUMN_SUMMARY : super.getColumnName(index);
		}
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