1. 子供の EditText にも id を振った方が良い TextInputLayout は以下のように、EditText を入れ子にして使います。 <android.support.design.widget.TextInputLayout android:id="@+id/text_input_message" android:layout_width="match_parent" android:layout_height="wrap_content"> <EditText android:id="@+id/message" android:layout_width="match_parent" android:layout_height="wrap_content" android:hint="@string/some_hints" android:inputType="tex
![TextInputLayout の Tips 5 選 - Qiita](https://cdn-ak-scissors.b.st-hatena.com/image/square/a55fdb5066dbfe46b7ec3af82a7b71dbd374da0c/height=288;version=1;width=512/https%3A%2F%2Fqiita-user-contents.imgix.net%2Fhttps%253A%252F%252Fcdn.qiita.com%252Fassets%252Fpublic%252Farticle-ogp-background-9f5428127621718a910c8b63951390ad.png%3Fixlib%3Drb-4.0.0%26w%3D1200%26mark64%3DaHR0cHM6Ly9xaWl0YS11c2VyLWNvbnRlbnRzLmltZ2l4Lm5ldC9-dGV4dD9peGxpYj1yYi00LjAuMCZ3PTkxNiZoPTMzNiZ0eHQ9VGV4dElucHV0TGF5b3V0JTIwJUUzJTgxJUFFJTIwVGlwcyUyMDUlMjAlRTklODElQjgmdHh0LWNvbG9yPSUyMzIxMjEyMSZ0eHQtZm9udD1IaXJhZ2lubyUyMFNhbnMlMjBXNiZ0eHQtc2l6ZT01NiZ0eHQtY2xpcD1lbGxpcHNpcyZ0eHQtYWxpZ249bGVmdCUyQ3RvcCZzPTk2ODhkNWVmODgyNDhiMjYxMjZkMDA5NGMxZjg5NjRm%26mark-x%3D142%26mark-y%3D112%26blend64%3DaHR0cHM6Ly9xaWl0YS11c2VyLWNvbnRlbnRzLmltZ2l4Lm5ldC9-dGV4dD9peGxpYj1yYi00LjAuMCZ3PTYxNiZ0eHQ9JTQwaGt1cm9rYXdhJnR4dC1jb2xvcj0lMjMyMTIxMjEmdHh0LWZvbnQ9SGlyYWdpbm8lMjBTYW5zJTIwVzYmdHh0LXNpemU9MzYmdHh0LWFsaWduPWxlZnQlMkN0b3Amcz1iZGU3ZWVjOTJhZGI0ZmEwZjVjZWM1NzI0ODVkMzc4MA%26blend-x%3D142%26blend-y%3D491%26blend-mode%3Dnormal%26s%3Df844094c7b3bfc2172d1bdd3dd805d65)