After a lengthy pastoral ministry in which he stood out as a wise and saintly bishop, he died in , venerated by the bishops of the region, his priests, people and the Holy Father Pius XI for having steered the ship of the Church through stormy waters. In this period of Italian history, Italy experienced the struggle over the labour unions, the rise of modernism among the clergy, the ongoing political struggle between Church and State, World War I and the reconstruction, the beginning of Luigi Sturzo's Popular Party, the rise of Mussolini and Fascism, the Concordat of Pius XI, to mention a few of the changes that are associated with modern times.
The example of lived faith at home and in his parish stayed with Giacinto throughout his life. He remarked that "Fiumicello is full of people who live a deep piety and faith". He received the name Andrea when he joined the Capuchins. In he entered the Capuchin Friars at their house of the Holy Redeemer in Venice and received the habit. On 4 October he made his final profession and on 19 June he was ordained priest.
Fr Andrea was an excellent and talented preacher. However, after a few years, his superiors assigned him to the work of formation in his province where he taught theology and was spiritual director for the students of the Order. On 18 April , at the age of 40, Fr Andrea was elected provincial minister. For two years, he governed the friars of the province, a task that prepared him to be Bishop of Treviso. In April , much to his surprise, during a private audience, St Pius X personally appointed the Servant of God as Bishop of Treviso and obliged him to accept the appointment.
Bishop Longhin accomplished a great deal as diocesan bishop. The first thing he did was to set out on a visitation of the diocese that lasted from to Then he organized and held a Synod in using much of the material from a Synod Pius X held as Patriarch of Venice. In he began a second visitation of the diocese that was interrupted by World War I and finished in In the diocese held a Eucharistic Congress.
In he launched the third pastoral visitation which he finished in Bishop Longhin was a great promoter of vocations to the priesthood and consecrated life. He was also a bishop who promoted holiness among the clergy with retreats, days of recollection and formation weeks.
