Question

I want to pass a List<Map<String, String>> to another Activity. How to implement Parcelable for it?

Answer 1

You could extend Map and implement Parcelable for it. When writing to parcel, you could write elements count as a first int, then iterate over entries and add them one after another like:

destParcelable.writeInt(size());
for (final Entry<String, String> entry : getEntries()) {
  destParcelable.writeString(entry.getKey());
  destParcelable.writeString(entry.getValue());
}

When reading from parcel just read the first int (that will be your entries count) and start a loop reading key and values one by one:

final int size = srcParcelable.readInt();
for (int i=0; i<size; i++) {
  put(srcParcelable.readString(), srcParcelable.readString());
}

And I believe there is a method to add list of parcelables to bundle, and since your map is a parcelable now it won’t be any problems.