HaHaLearn shows you an optimal way of typing Chinese using strokes and radicals. Just enter any Chinese character and HaHaLearn will show the sequence of strokes and radicals that make up the character.
The keyboard extension that comes with HaHaLearn is an implementation of the optimal Chinese character typing demonstrated in HaHaLearn, enhanced with predictive typing.
哈哈輸入法用部首和筆劃輸入中文，另加上预测下一字功能。