@Override public String[] getColumnNames() {
			String[] names = super.getColumnNames();
			if (mAppendSummaryColumn) {
				names = Arrays.copyOf(names, names.length + 1);
				names[names.length - 1] = DocumentsContract.Root.COLUMN_SUMMARY;
			}
			return names;
		}
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