ボタンをimageButtonに変更， #254

Closed k-kosuga wants to merge 3 commits into nitta-lab-2022:master from nitta-lab-2022:DrawingActivity

2022-11-01	39422a4 Browse files » レイアウトを調整，筆の透明度を実装 m-mifune committed on 1 Nov 2022
	a6fda71 Browse files » Merge branch 'master' of http://nitta-lab-www.is.konan-u.ac.jp/gitbucket/git/nitta-lab-2022/IrisClient into DrawingActivity m-mifune committed on 1 Nov 2022
	ec443bf Browse files » ボタンをimageButtonに変更， m-mifune committed on 1 Nov 2022