add state animation demo;

app/src/main/java/com/ocnyang/androidanimationset/MyRecyclerViewAdapter.java

@@ -15,6 +15,7 @@
 import com.ocnyang.propertyanimation.PropertyAnimationActivity;
 import com.ocnyang.revealanimation.RevealAnimationActivity;
 import com.ocnyang.rippleanimation.TouchFeedbackActivity;
+import com.ocnyang.stateanimation.StateAnimationActivity;
 import com.ocnyang.transitionanimation.TransitionAnimationActivity;
 import com.ocnyang.viewanimation.ViewAnimationActivity;
 
@@ -74,6 +75,7 @@ public void onClick(View v) {
                         mContext.startActivity(new Intent(mContext,TransitionAnimationActivity.class));
                         break;
                     case 6:
+                        mContext.startActivity(new Intent(mContext, StateAnimationActivity.class));
                         break;
                     case 7:
                         break;

state-animation/README.md

@@ -36,8 +36,12 @@
 > 如果一个item没有任何的状态说明，那么它将可以被任何一个状态匹配。
 
 View 状态改变的动画主要是两个类： 
-1. StateListAnimator 是个动画, 在res/anim中  
-2. AnimatedStateListDrawable 是个 Drawable, 在res/drawable中。 
+1. StateListAnimator 是个动画, 在 res/anim (或者 res/animator)中  
+2. AnimatedStateListDrawable 是个 Drawable, 在 res/drawable 中。 
+
+> ps:这里的 StateListAnimator 大多教程都说放在 `res/anim` 目录下，放在此目录下能够正常使用，但在 AS3.0.1 中会有警示
+*`<selector> XML file should be in either "animator" or "drawable", not "anim"`* 。  
+> 我尝试放到 `res/animator` 后不再有警示，并且完全不影响使用。所以这里建议大家以后都放到此目录下。
 
 ### StateListAnimator 
 
@@ -81,8 +85,8 @@ xml文件：你可以改成任意一种objectAnimator动画。 这里使用的
 
 ### AnimatedStateListDrawable
 
-xml布局：这个效果有点意思   
-当你是 pressed 状态的时候 animation-list 正着走一遍，drawable 使用最后一个。 
+xml布局：这个效果有点意思（ps:但没卵用啊，目前我是没有发现那种场景可以使用）   
+当你是 pressed 状态的时候 animation-list 正着走一遍，drawable 使用最后一个。  
 当你是 default 状态时 animation-list 反着走一遍，drawable 使用第一个。
 
 `res/drawable/myanimstatedrawable`

state-animation/build.gradle

@@ -28,6 +28,7 @@ dependencies {
     implementation fileTree(dir: 'libs', include: ['*.jar'])
 
     implementation 'com.android.support:appcompat-v7:27.1.0'
+    implementation 'com.android.support.constraint:constraint-layout:1.0.2'
     testImplementation 'junit:junit:4.12'
     androidTestImplementation 'com.android.support.test:runner:1.0.1'
     androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.1'

state-animation/src/main/AndroidManifest.xml

@@ -1,2 +1,10 @@
+<?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
-          package="com.ocnyang.stateanimation"/>
+          package="com.ocnyang.stateanimation">
+
+    <application>
+        <activity android:name=".StateAnimationActivity">
+        </activity>
+    </application>
+
+</manifest>

state-animation/src/main/java/com/ocnyang/stateanimation/StateAnimationActivity.java

@@ -0,0 +1,39 @@
+package com.ocnyang.stateanimation;
+
+import android.animation.AnimatorInflater;
+import android.animation.StateListAnimator;
+import android.os.Bundle;
+import android.support.v7.app.AppCompatActivity;
+import android.support.v7.widget.Toolbar;
+import android.view.MenuItem;
+
+public class StateAnimationActivity extends AppCompatActivity {
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_state_animation);
+        initToolbar();
+        setStateListAnimator();
+    }
+
+    private void setStateListAnimator() {
+        StateListAnimator stateListAnimator = AnimatorInflater.loadStateListAnimator(this, R.animator.anim_view_state_change_2);
+        findViewById(R.id.view_puppet2).setStateListAnimator(stateListAnimator);
+    }
+
+    private void initToolbar() {
+        Toolbar toolbar = ((Toolbar) findViewById(R.id.toolbar));
+        setSupportActionBar(toolbar);
+        getSupportActionBar().setDisplayHomeAsUpEnabled(true);
+    }
+
+    @Override
+    public boolean onOptionsItemSelected(MenuItem item) {
+        int i = item.getItemId();
+        if (i == android.R.id.home) {
+            finish();
+        }
+        return super.onOptionsItemSelected(item);
+    }
+}

state-animation/src/main/res/anim/anim_view_state_change.xml

@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="utf-8"?>
+<selector xmlns:android="http://schemas.android.com/apk/res/android">
+    <item android:state_pressed="true">
+        <set>
+            <objectAnimator
+                android:duration="@android:integer/config_shortAnimTime"
+                android:propertyName="translationZ"
+                android:valueTo="7dp"
+                android:valueType="floatType"/>
+        </set>
+    </item>
+
+    <item
+        android:state_pressed="false">
+        <set>
+            <objectAnimator
+                android:duration="100"
+                android:propertyName="translationZ"
+                android:valueTo="2dp"
+                android:valueType="floatType"/>
+        </set>
+    </item>
+</selector>

state-animation/src/main/res/animator/anim_view_state_change_2.xml

@@ -0,0 +1,33 @@
+<?xml version="1.0" encoding="utf-8"?>
+<selector xmlns:android="http://schemas.android.com/apk/res/android">
+    <item android:state_pressed="true">
+        <set>
+            <objectAnimator
+                android:duration="@android:integer/config_shortAnimTime"
+                android:propertyName="translationZ"
+                android:valueTo="5dp"
+                android:valueType="floatType"/>
+            <objectAnimator
+                android:duration="@android:integer/config_shortAnimTime"
+                android:propertyName="rotationX"
+                android:valueTo="10"
+                android:valueType="floatType"/>
+        </set>
+    </item>
+
+    <item
+        android:state_pressed="false">
+        <set>
+            <objectAnimator
+                android:duration="100"
+                android:propertyName="translationZ"
+                android:valueTo="2dp"
+                android:valueType="floatType"/>
+            <objectAnimator
+                android:duration="@android:integer/config_shortAnimTime"
+                android:propertyName="rotationX"
+                android:valueTo="0"
+                android:valueType="floatType"/>
+        </set>
+    </item>
+</selector>

state-animation/src/main/res/drawable/bg_animated_statelist_drawable.xml

@@ -0,0 +1,100 @@
+<?xml version="1.0" encoding="utf-8"?>
+<animated-selector
+    xmlns:android="http://schemas.android.com/apk/res/android">
+
+    <!-- provide a different drawable for each state -->
+    <item
+        android:id="@+id/pressed"
+        android:drawable="@drawable/img29"
+        android:state_pressed="true"/>
+    <!-- <item
+        android:id="@+id/focused"
+        android:drawable="@drawable/btn_focused"
+        android:state_focused="true"/> -->
+    <item
+        android:id="@id/default1"
+        android:drawable="@drawable/img1"/>
+
+    <!-- specify a transition -->
+    <transition
+        android:fromId="@+id/default1"
+        android:toId="@+id/pressed">
+        <animation-list>
+            <item
+                android:drawable="@drawable/img2"
+                android:duration="100"/>
+            <item
+                android:drawable="@drawable/img3"
+                android:duration="100"/>
+            <item
+                android:drawable="@drawable/img4"
+                android:duration="100"/>
+            <item
+                android:drawable="@drawable/img5"
+                android:duration="100"/>
+            <item
+                android:drawable="@drawable/img6"
+                android:duration="100"/>
+            <item
+                android:drawable="@drawable/img7"
+                android:duration="100"/>
+            <item
+                android:drawable="@drawable/img8"
+                android:duration="100"/>
+            <item
+                android:drawable="@drawable/img9"
+                android:duration="100"/>
+            <item
+                android:drawable="@drawable/img10"
+                android:duration="100"/>
+            <item
+                android:drawable="@drawable/img13"
+                android:duration="100"/>
+            <item
+                android:drawable="@drawable/img14"
+                android:duration="100"/>
+            <item
+                android:drawable="@drawable/img15"
+                android:duration="100"/>
+            <item
+                android:drawable="@drawable/img17"
+                android:duration="100"/>
+            <item
+                android:drawable="@drawable/img18"
+                android:duration="100"/>
+            <item
+                android:drawable="@drawable/img19"
+                android:duration="100"/>
+            <item
+                android:drawable="@drawable/img20"
+                android:duration="100"/>
+            <item
+                android:drawable="@drawable/img21"
+                android:duration="100"/>
+            <item
+                android:drawable="@drawable/img22"
+                android:duration="100"/>
+            <item
+                android:drawable="@drawable/img23"
+                android:duration="100"/>
+            <item
+                android:drawable="@drawable/img24"
+                android:duration="100"/>
+            <item
+                android:drawable="@drawable/img25"
+                android:duration="100"/>
+            <item
+                android:drawable="@drawable/img26"
+                android:duration="100"/>
+            <item
+                android:drawable="@drawable/img27"
+                android:duration="100"/>
+            <item
+                android:drawable="@drawable/img28"
+                android:duration="100"/>
+            <item
+                android:drawable="@drawable/img29"
+                android:duration="100"/>
+        </animation-list>
+    </transition>
+</animated-selector>

state-animation/src/main/res/layout/activity_state_animation.xml

@@ -0,0 +1,47 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:orientation="vertical"
+    tools:context="com.ocnyang.stateanimation.StateAnimationActivity">
+
+    <android.support.v7.widget.Toolbar
+        android:id="@+id/toolbar"
+        android:layout_width="match_parent"
+        android:layout_height="?attr/actionBarSize"
+        android:background="?attr/colorPrimary"
+        android:minHeight="?attr/actionBarSize"/>
+
+    <TextView
+        android:id="@+id/view_puppet1"
+        android:layout_width="200dp"
+        android:layout_height="80dp"
+        android:layout_gravity="center_horizontal"
+        android:layout_margin="15dp"
+        android:background="@android:color/white"
+        android:clickable="true"
+        android:stateListAnimator="@anim/anim_view_state_change"/>
+
+    <TextView
+        android:id="@+id/view_puppet2"
+        android:layout_width="200dp"
+        android:layout_height="80dp"
+        android:layout_gravity="center_horizontal"
+        android:layout_margin="15dp"
+        android:background="@android:color/white"
+        android:clickable="true"/>
+
+    <View
+        android:id="@+id/view_puppet3"
+        android:layout_width="150dp"
+        android:layout_height="150dp"
+        android:layout_gravity="center_horizontal"
+        android:layout_margin="15dp"
+        android:background="@drawable/bg_animated_statelist_drawable"
+        android:clickable="true"/>
+
+
+</LinearLayout>