Add new subject and animation of to-do list

app/src/main/kotlin/cn/super12138/todo/views/todo/ToDoFragment.kt

@@ -105,6 +105,7 @@ class ToDoFragment : Fragment() {
                             R.id.subject_history -> getString(R.string.subject_history)
                             R.id.subject_physics -> getString(R.string.subject_physics)
                             R.id.subject_law -> getString(R.string.subject_law)
+                            R.id.subject_other -> getString(R.string.subject_other)
                             else -> getString(R.string.subject_unknown)
                         }
 
@@ -172,10 +173,20 @@ class ToDoFragment : Fragment() {
 
         todoViewModel.emptyTipVis.observe(viewLifecycleOwner, Observer { visibility ->
             if (visibility == View.VISIBLE) {
+                binding.todoList.alpha = 1f
+                binding.todoList.animate().alpha(0f).duration = 200
                 binding.todoList.visibility = View.GONE
+
+                binding.emptyTip.alpha = 0f
                 binding.emptyTip.visibility = View.VISIBLE
+                binding.emptyTip.animate().alpha(1f).duration = 200
             } else {
+                binding.todoList.alpha = 0f
                 binding.todoList.visibility = View.VISIBLE
+                binding.todoList.animate().alpha(1f).duration = 200
+
+                binding.emptyTip.alpha = 1f
+                binding.emptyTip.animate().alpha(0f).duration = 200
                 binding.emptyTip.visibility = View.GONE
             }
             if (todoList.size == 0 && !binding.addItem.isShown) {

app/src/main/res/layout/dialog_add_todo.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
+<androidx.core.widget.NestedScrollView xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     android:layout_width="match_parent"
     android:layout_height="match_parent">
@@ -106,6 +106,13 @@
                 android:layout_height="wrap_content"
                 android:text="@string/subject_law" />
 
+            <com.google.android.material.chip.Chip
+                android:id="@+id/subject_other"
+                style="@style/Widget.Material3.Chip.Filter"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:text="@string/subject_other" />
+
         </com.google.android.material.chip.ChipGroup>
     </LinearLayout>
-</ScrollView>
+</androidx.core.widget.NestedScrollView>

app/src/main/res/layout/fragment_todo.xml

@@ -3,7 +3,6 @@
     xmlns:app="http://schemas.android.com/apk/res-auto"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
-    android:animateLayoutChanges="true"
     android:orientation="vertical">
 
     <!--<LinearLayout

app/src/main/res/values-zh-rCN/strings.xml

@@ -20,6 +20,7 @@
     <string name="subject_history">历史</string>
     <string name="subject_geography">地理</string>
     <string name="subject_law">道法</string>
+    <string name="subject_other">其它</string>
     <!--UI-->
     <string name="cancel">取消</string>
     <string name="ok">确定</string>

app/src/main/res/values/strings.xml

@@ -20,6 +20,7 @@
     <string name="subject_history">History</string>
     <string name="subject_geography">Geography</string>
     <string name="subject_law">Law</string>
+    <string name="subject_other">Other</string>
     <!--UI-->
     <string name="cancel">Cancel</string>
     <string name="ok">OK</string>