优化样式

student/src/main/res/layout/activity_message_box.xml

@@ -54,6 +54,7 @@
                 android:layout_marginBottom="10dp"
                 android:background="@drawable/bg_unread_red"
                 android:gravity="center"
+                android:includeFontPadding="false"
                 android:minWidth="@dimen/dp_14"
                 android:paddingLeft="4dp"
                 android:paddingRight="4dp"
@@ -104,6 +105,7 @@
                 android:layout_marginBottom="10dp"
                 android:background="@drawable/bg_unread_red"
                 android:gravity="center"
+                android:includeFontPadding="false"
                 android:minWidth="@dimen/dp_14"
                 android:paddingLeft="4dp"
                 android:paddingRight="4dp"
@@ -154,6 +156,7 @@
                 android:layout_marginBottom="10dp"
                 android:background="@drawable/bg_unread_red"
                 android:gravity="center"
+                android:includeFontPadding="false"
                 android:minWidth="@dimen/dp_14"
                 android:paddingLeft="4dp"
                 android:paddingRight="4dp"

teacher/src/main/res/layout/activity_message_box.xml

@@ -55,6 +55,7 @@
                 android:background="@drawable/bg_unread_red"
                 android:gravity="center"
                 android:minWidth="@dimen/dp_14"
+                android:includeFontPadding="false"
                 android:paddingLeft="4dp"
                 android:paddingRight="4dp"
                 android:textColor="@color/white"
@@ -105,6 +106,7 @@
                 android:background="@drawable/bg_unread_red"
                 android:gravity="center"
                 android:minWidth="@dimen/dp_14"
+                android:includeFontPadding="false"
                 android:paddingLeft="4dp"
                 android:paddingRight="4dp"
                 android:textColor="@color/white"
@@ -156,6 +158,7 @@
                 android:gravity="center"
                 android:minWidth="@dimen/dp_14"
                 android:paddingLeft="4dp"
+                android:includeFontPadding="false"
                 android:paddingRight="4dp"
                 android:textColor="@color/white"
                 android:textSize="@dimen/sp_11"