feat: add appear/disappear animation

23 files changed, 794 insertions, 51 deletions

diff --git a/README.md b/README.md
index 695949f..136bfb6 100644
--- a/README.md
+++ b/README.md
@@ -69,6 +69,18 @@ Beautiful animations and views from AOSP
 
  停止動畫: `mFingerprintAnimator.stopIconAnimation()`
 
+## Appear / Disappear Animation
+
+  **設置 中 確認密碼時的進入/退出動畫** (API21+)
+
+  Activity 位於：[ConfirmLockPattern](https://android.googlesource.com/platform/packages/apps/Settings/+/master/src/com/android/settings/ConfirmLockPattern.java)
+
+  ![AppearAnimation](https://raw.githubusercontent.com/AndroidSnippet/Animations/master/art/AppearAnimation.GIF)
+
+  使用方法：[參照 Demo AppearAnimationActivity](https://github.com/AndroidSnippet/Animations/tree/master/app/src/main/java/top/trumeet/snippet/aospanimation/AppearAnimationActivity.java)
+
+  `startAnimation2d`的第一個參數 T[][] 是可以傳入 X行X列 的二維數組，比如説 TableLayout。詳見 Demo
+
 # Licenses
 使用本項目請確保您遵守 `Apache License 2.0`
 ```
diff --git a/app/build.gradle b/app/build.gradle
index 64efa10..705f3ca 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -5,7 +5,7 @@ android {
     buildToolsVersion "26.0.1"
     defaultConfig {
         applicationId "top.trumeet.snippet.aospanimation"
-        minSdkVersion 15
+        minSdkVersion 16
         targetSdkVersion 26
         versionCode 1
         versionName "1.0"
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 874160c..cc612f8 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -6,11 +6,13 @@
         android:roundIcon="@mipmap/ic_launcher_round"
         android:supportsRtl="true"
         android:theme="@style/Theme.AppCompat.Light">
-        <activity android:name=".MainActivity">
+        <activity android:name=".LauncherActivity">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
         </activity>
+        <activity android:name=".FingerprintIsloatedActivity" />
+        <activity android:name=".AppearAnimationActivity" />
     </application>
 </manifest>
diff --git a/app/src/main/java/top/trumeet/snippet/aospanimation/AppearAnimationActivity.java b/app/src/main/java/top/trumeet/snippet/aospanimation/AppearAnimationActivity.java
new file mode 100644
index 0000000..b110f68
--- /dev/null
+++ b/app/src/main/java/top/trumeet/snippet/aospanimation/AppearAnimationActivity.java
@@ -0,0 +1,147 @@
+package top.trumeet.snippet.aospanimation;
+
+import android.os.Bundle;
+import android.view.View;
+import android.view.animation.AnimationUtils;
+import android.view.animation.Interpolator;
+import android.widget.TableLayout;
+import android.widget.TableRow;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+
+import top.trumeet.snippet.aospanimation.library.animation.AppearAnimationCreator;
+import top.trumeet.snippet.aospanimation.library.animation.AppearAnimationUtils;
+import top.trumeet.snippet.aospanimation.library.animation.DisappearAnimationUtils;
+
+/**
+ * Created by Trumeet on 2017/8/7.
+ * @see top.trumeet.snippet.aospanimation.library.animation.AppearAnimationUtils
+ */
+
+public class AppearAnimationActivity extends ViewAnimationActivity implements AppearAnimationCreator<Object> {
+    private AppearAnimationUtils mAppearAnimationUtils;
+    private DisappearAnimationUtils mDisappearAnimationUtils;
+
+    private View icon_top;
+    private TableLayout tableLayout;
+
+    @Override
+    public void onCreate (Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.appear);
+        icon_top = findViewById(R.id.icon_top);
+        tableLayout = findViewById(R.id.table);
+        mAppearAnimationUtils = new AppearAnimationUtils(this,
+                AppearAnimationUtils.DEFAULT_APPEAR_DURATION, 2f /* translationScale */,
+                1.3f /* delayScale */, AnimationUtils.loadInterpolator(
+                this, R.anim.linear_out_slow_in));
+        mDisappearAnimationUtils = new DisappearAnimationUtils(this,
+                125, 4f /* translationScale */,
+                0.3f /* delayScale */, AnimationUtils.loadInterpolator(
+                this, R.anim.fast_out_linear_in),
+                new AppearAnimationUtils.RowTranslationScaler() {
+                    @Override
+                    public float getRowTranslationScale(int row, int numRows) {
+                        return (float)(numRows - row) / numRows;
+                    }
+                });
+        startAnimation();
+    }
+
+    @Override
+    public void startAnimation() {
+        mAppearAnimationUtils.startAnimation2d(getViews()
+                , null, this);
+    }
+
+    @Override
+    public void stopAnimation() {
+        mDisappearAnimationUtils.startAnimation2d(getViews(),
+                new Runnable() {
+                    @Override
+                    public void run() {
+                        /*
+                        finish();
+                        overridePendingTransition(
+                                R.anim.confirm_credential_close_enter,
+                                R.anim.confirm_credential_close_exit);
+                        */
+                    }
+                }, this);
+    }
+
+    @Override
+    public void onBackPressed () {
+        mDisappearAnimationUtils.startAnimation2d(getViews(),
+                new Runnable() {
+                    @Override
+                    public void run() {
+                        finish();
+                        overridePendingTransition(
+                                R.anim.confirm_credential_close_enter,
+                                R.anim.confirm_credential_close_exit);
+                    }
+                }, this);
+    }
+
+    @Override
+    public CharSequence getStartText() {
+        return "Appear";
+    }
+
+    @Override
+    public CharSequence getStopText() {
+        return "Disappear";
+    }
+
+    private static List<TableRow> getRows (TableLayout table) {
+        List<TableRow> list = new ArrayList<>(table.getChildCount());
+        for(int i = 0, j = table.getChildCount(); i < j; i++) {
+            View view = table.getChildAt(i);
+            if (view instanceof TableRow) {
+                TableRow row = (TableRow) view;
+                list.add(row);
+            }
+        }
+        return list;
+    }
+
+    private ArrayList<ArrayList<Object>> getAllChildren() {
+        ArrayList<ArrayList<Object>> result = new ArrayList<>();
+        result.add(new ArrayList<Object>(Collections.singletonList(icon_top)));
+        List<TableRow> list = getRows(tableLayout);
+        List<List<View>> radios = new ArrayList<>(list.size() * 5);
+        for (TableRow row : list) {
+            List<View> views = new ArrayList<>(row.getChildCount());
+            for (int i = 0; i < row.getChildCount(); i ++) {
+                views.add(row.getChildAt(i));
+            }
+            radios.add(views);
+        }
+        for (int i = 0; i < radios.size(); i++) {
+            ArrayList<Object> row = new ArrayList<>();
+            row.addAll(radios.get(i));
+            result.add(row);
+        }
+        return result;
+    }
+    private Object[][] getViews () {
+        ArrayList<ArrayList<Object>> result = getAllChildren();
+        Object[][] resultArr = new Object[result.size()][5];
+        for (int i = 0; i < result.size(); i++) {
+            ArrayList<Object> row = result.get(i);
+            for (int j = 0; j < row.size(); j++) {
+                resultArr[i][j] = row.get(j);
+            }
+        }
+        return resultArr;
+    }
+
+    @Override
+    public void createAnimation(Object obj, long delay, long duration, float translationY, boolean appearing, Interpolator interpolator, Runnable finishListener) {
+        mAppearAnimationUtils.createAnimation((View) obj, delay, duration, translationY,
+                appearing, interpolator, finishListener);
+    }
+}
diff --git a/app/src/main/java/top/trumeet/snippet/aospanimation/MainActivity.java b/app/src/main/java/top/trumeet/snippet/aospanimation/FingerprintIsloatedActivity.java
index e1cf783..611e273 100644
--- a/app/src/main/java/top/trumeet/snippet/aospanimation/MainActivity.java
+++ b/app/src/main/java/top/trumeet/snippet/aospanimation/FingerprintIsloatedActivity.java
@@ -4,11 +4,8 @@ import android.annotation.SuppressLint;
 import android.content.res.ColorStateList;
 import android.os.Bundle;
 import android.support.graphics.drawable.AnimatedVectorDrawableCompat;
-import android.support.v7.app.AppCompatActivity;
 import android.support.v7.content.res.AppCompatResources;
 import android.support.v7.widget.AppCompatImageView;
-import android.view.Menu;
-import android.view.MenuItem;
 import android.widget.CheckBox;
 import android.widget.CompoundButton;
 
@@ -19,18 +16,19 @@ import top.trumeet.snippet.aospanimation.library.drawables.LoopAnimatedVectorDra
  * Demo activity
  */
 
-public class MainActivity extends AppCompatActivity {
+public class FingerprintIsloatedActivity extends ViewAnimationActivity {
     private LoopAnimatedVectorDrawableCompat mFingerprintAnimator;
+
     @SuppressLint("RestrictedApi")
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
-        setContentView(R.layout.activity_main);
+        setContentView(R.layout.fingerprint_isloated);
         final AppCompatImageView fingerprintIsolated = findViewById(R.id.fingerprint_animator);
         mFingerprintAnimator = new LoopAnimatedVectorDrawableCompat(AnimatedVectorDrawableCompat.create(this,
                 R.drawable.enrollment_fingerprint_isolated_animation));
 
-        fingerprintIsolated.setBackgroundDrawable(AppCompatResources.getDrawable(MainActivity.this
+        fingerprintIsolated.setBackgroundDrawable(AppCompatResources.getDrawable(FingerprintIsloatedActivity.this
                 , top.trumeet.snippet.aospanimation.library.R.drawable.fp_illustration_enrollment));
         fingerprintIsolated.setSupportBackgroundTintList(ColorStateList.valueOf(getResources().getColor(top.trumeet.snippet.aospanimation.library.R.color.fingerprint_indicator_background_resting)));
 
@@ -39,7 +37,7 @@ public class MainActivity extends AppCompatActivity {
             @Override
             public void onCheckedChanged(CompoundButton compoundButton, boolean b) {
                 if (b) {
-                    fingerprintIsolated.setBackgroundDrawable(AppCompatResources.getDrawable(MainActivity.this
+                    fingerprintIsolated.setBackgroundDrawable(AppCompatResources.getDrawable(FingerprintIsloatedActivity.this
                             , top.trumeet.snippet.aospanimation.library.R.drawable.fp_illustration_enrollment));
                     fingerprintIsolated.setSupportBackgroundTintList(ColorStateList.valueOf(getResources().getColor(top.trumeet.snippet.aospanimation.library.R.color.fingerprint_indicator_background_resting)));
                 } else {
@@ -64,24 +62,12 @@ public class MainActivity extends AppCompatActivity {
     }
 
     @Override
-    public boolean onCreateOptionsMenu (Menu menu) {
-        menu.add(0, 0, 0, "Start")
-                .setShowAsAction(MenuItem.SHOW_AS_ACTION_ALWAYS);
-        menu.add(0, 1, 0, "Stop")
-                .setShowAsAction(MenuItem.SHOW_AS_ACTION_ALWAYS);
-        return true;
+    public void startAnimation() {
+        mFingerprintAnimator.startAnimation();
     }
 
     @Override
-    public boolean onOptionsItemSelected (MenuItem item) {
-        switch (item.getItemId()) {
-            case 0 :
-                mFingerprintAnimator.startAnimation();
-                return true;
-            case 1 :
-                mFingerprintAnimator.stopAnimation();
-                return true;
-        }
-        return false;
+    public void stopAnimation() {
+        mFingerprintAnimator.stopAnimation();
     }
 }
diff --git a/app/src/main/java/top/trumeet/snippet/aospanimation/LauncherActivity.java b/app/src/main/java/top/trumeet/snippet/aospanimation/LauncherActivity.java
new file mode 100644
index 0000000..c24f0d9
--- /dev/null
+++ b/app/src/main/java/top/trumeet/snippet/aospanimation/LauncherActivity.java
@@ -0,0 +1,53 @@
+package top.trumeet.snippet.aospanimation;
+
+import android.content.Intent;
+import android.os.Bundle;
+import android.support.annotation.Nullable;
+import android.support.v7.app.AppCompatActivity;
+import android.view.View;
+import android.widget.AdapterView;
+import android.widget.ListView;
+import android.widget.SimpleAdapter;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * Created by Trumeet on 2017/8/7.
+ * @see FingerprintIsloatedActivity
+ * @see AppearAnimationActivity
+ */
+
+public class LauncherActivity extends AppCompatActivity {
+    private static final Class[] DATA = new Class[] {
+            FingerprintIsloatedActivity.class,
+            AppearAnimationActivity.class
+    };
+    @Override
+    protected void onCreate(@Nullable Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+
+        ArrayList<Map<String, Object>> list = new ArrayList<>(DATA.length);
+        for (Class clz : DATA) {
+            Map<String, Object> map = new HashMap<>(1);
+            map.put("Title", clz.getSimpleName());
+            map.put("Class", clz);
+            list.add(map);
+        }
+
+        ListView listView = new ListView(this);
+        listView.setAdapter(new SimpleAdapter(this, list,
+                android.R.layout.simple_list_item_1, new String[]{"Title"}, new int[]{android.R.id.text1}));
+        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
+            @Override
+            @SuppressWarnings("unchecked")
+            public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
+                Map<String, Object> data = (Map<String, Object>)adapterView.getItemAtPosition(i);
+                startActivity(new Intent(LauncherActivity.this,
+                        (Class)data.get("Class")));
+            }
+        });
+        setContentView(listView);
+    }
+}
diff --git a/app/src/main/java/top/trumeet/snippet/aospanimation/ViewAnimationActivity.java b/app/src/main/java/top/trumeet/snippet/aospanimation/ViewAnimationActivity.java
new file mode 100644
index 0000000..a91f566
--- /dev/null
+++ b/app/src/main/java/top/trumeet/snippet/aospanimation/ViewAnimationActivity.java
@@ -0,0 +1,46 @@
+package top.trumeet.snippet.aospanimation;
+
+import android.support.v7.app.AppCompatActivity;
+import android.view.Menu;
+import android.view.MenuItem;
+
+/**
+ * Created by Trumeet on 2017/8/7.
+ * A abstract activity, include "Start" and "Stop" animation menu
+ */
+
+public abstract class ViewAnimationActivity extends AppCompatActivity {
+
+    @Override
+    public boolean onCreateOptionsMenu (Menu menu) {
+        menu.add(0, 0, 0, getStartText())
+                .setShowAsAction(MenuItem.SHOW_AS_ACTION_ALWAYS);
+        menu.add(0, 1, 0, getStopText())
+                .setShowAsAction(MenuItem.SHOW_AS_ACTION_ALWAYS);
+        return true;
+    }
+
+    @Override
+    public boolean onOptionsItemSelected (MenuItem item) {
+        switch (item.getItemId()) {
+            case 0 :
+                startAnimation();
+                return true;
+            case 1 :
+                stopAnimation();
+                return true;
+        }
+        return false;
+    }
+
+    public abstract void startAnimation();
+    public abstract void stopAnimation();
+
+    public CharSequence getStartText () {
+        return "Start";
+    }
+
+    public CharSequence getStopText () {
+        return "Stop";
+    }
+}
diff --git a/app/src/main/res/layout/activity_main.xml b/app/src/main/res/layout/activity_main.xml
deleted file mode 100644
index 1be4af6..0000000
--- a/app/src/main/res/layout/activity_main.xml
+++ /dev/null
@@ -1,25 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<ScrollView 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">
-    <LinearLayout
-        android:gravity="center_horizontal"
-        android:orientation="vertical"
-        android:layout_width="match_parent"
-        android:layout_height="wrap_content">
-        <android.support.v7.widget.AppCompatImageView
-            android:id="@+id/fingerprint_animator"
-            android:layout_width="@dimen/fingerprint_animation_size"
-            android:layout_height="@dimen/fingerprint_animation_size"
-            app:background="@drawable/fp_illustration_enrollment"
-            app:backgroundTint="@color/fingerprint_indicator_background_resting"
-            />
-        <CheckBox
-            android:id="@+id/check_show_background"
-            android:checked="true"
-            android:text="Show Background"
-            android:layout_width="wrap_content"
-            android:layout_height="wrap_content" />
-    </LinearLayout>
-</ScrollView>
\ No newline at end of file
diff --git a/app/src/main/res/layout/appear.xml b/app/src/main/res/layout/appear.xml
new file mode 100644
index 0000000..4913ef8
--- /dev/null
+++ b/app/src/main/res/layout/appear.xml
@@ -0,0 +1,56 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:orientation="vertical"
+    android:gravity="center_horizontal"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent">
+    <ImageView
+        android:id="@+id/icon_top"
+        android:layout_marginTop="16dp"
+        android:contentDescription="@null"
+        android:src="@mipmap/ic_launcher_round"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content" />
+    <TableLayout
+        android:id="@+id/table"
+        android:layout_gravity="center"
+        android:layout_marginTop="16dp"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content">
+        <TableRow>
+            <RadioButton />
+            <RadioButton />
+            <RadioButton />
+            <RadioButton />
+            <RadioButton />
+        </TableRow>
+        <TableRow>
+            <RadioButton />
+            <RadioButton />
+            <RadioButton />
+            <RadioButton />
+            <RadioButton />
+        </TableRow>
+        <TableRow>
+            <RadioButton />
+            <RadioButton />
+            <RadioButton />
+            <RadioButton />
+            <RadioButton />
+        </TableRow>
+        <TableRow>
+            <RadioButton />
+            <RadioButton />
+            <RadioButton />
+            <RadioButton />
+            <RadioButton />
+        </TableRow>
+        <TableRow>
+            <RadioButton />
+            <RadioButton />
+            <RadioButton />
+            <RadioButton />
+            <RadioButton />
+        </TableRow>
+    </TableLayout>
+</LinearLayout>
\ No newline at end of file
diff --git a/app/src/main/res/layout/fingerprint_isloated.xml b/app/src/main/res/layout/fingerprint_isloated.xml
new file mode 100644
index 0000000..961f3bd
--- /dev/null
+++ b/app/src/main/res/layout/fingerprint_isloated.xml
@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout android:gravity="center_horizontal"
+    android:orientation="vertical"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto">
+    <android.support.v7.widget.AppCompatImageView
+        android:id="@+id/fingerprint_animator"
+        android:layout_width="@dimen/fingerprint_animation_size"
+        android:layout_height="@dimen/fingerprint_animation_size"
+        app:background="@drawable/fp_illustration_enrollment"
+        app:backgroundTint="@color/fingerprint_indicator_background_resting"
+        />
+    <CheckBox
+        android:id="@+id/check_show_background"
+        android:checked="true"
+        android:text="Show Background"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content" />
+</LinearLayout>
\ No newline at end of file
diff --git a/art/AppearAnimation.gif b/art/AppearAnimation.gif
new file mode 100644
index 0000000..03c2031
--- /dev/null
+++ b/art/AppearAnimation.gif
diff --git a/art/appear_animation_demo.mp4 b/art/appear_animation_demo.mp4
new file mode 100644
index 0000000..54ad2e7
--- /dev/null
+++ b/art/appear_animation_demo.mp4
diff --git a/build.gradle b/build.gradle
index 540ef2b..c1344f9 100644
--- a/build.gradle
+++ b/build.gradle
@@ -17,6 +17,11 @@ buildscript {
 }
 
 allprojects {
+    gradle.projectsEvaluated {
+        tasks.withType(JavaCompile) {
+            options.compilerArgs.add('-Xbootclasspath/p:app\\lib\\classes.jar')
+        }
+    }
     repositories {
         google()
         jcenter()
diff --git a/library/build.gradle b/library/build.gradle
index fe4f348..bdb8c18 100644
--- a/library/build.gradle
+++ b/library/build.gradle
@@ -8,7 +8,7 @@ android {
 
 
     defaultConfig {
-        minSdkVersion 15
+        minSdkVersion 16
         targetSdkVersion 26
         versionCode 1
         versionName "1.0"
@@ -31,4 +31,5 @@ dependencies {
     androidTestCompile 'com.android.support.test:runner:0.5'
     androidTestCompile 'com.android.support.test.espresso:espresso-core:2.2.2'
     compile 'com.android.support:appcompat-v7:26.0.0'
+    provided files('lib/classes.jar')
 }
diff --git a/library/lib/classes.jar b/library/lib/classes.jar
new file mode 100644
index 0000000..1036492
--- /dev/null
+++ b/library/lib/classes.jar
diff --git a/library/src/main/java/top/trumeet/snippet/aospanimation/library/animation/AppearAnimationCreator.java b/library/src/main/java/top/trumeet/snippet/aospanimation/library/animation/AppearAnimationCreator.java
new file mode 100644
index 0000000..c4d38ff
--- /dev/null
+++ b/library/src/main/java/top/trumeet/snippet/aospanimation/library/animation/AppearAnimationCreator.java
@@ -0,0 +1,29 @@
+/*
+ * Copyright (C) 2015 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License
+ */
+
+package top.trumeet.snippet.aospanimation.library.animation;
+
+import android.view.animation.Interpolator;
+
+/**
+ * An interface which can create animations when starting an appear animation with
+ * {@link AppearAnimationUtils}
+ */
+public interface AppearAnimationCreator<T> {
+     void createAnimation(T animatedObject, long delay, long duration,
+             float translationY, boolean appearing, Interpolator interpolator,
+             Runnable finishListener);
+}
diff --git a/library/src/main/java/top/trumeet/snippet/aospanimation/library/animation/AppearAnimationUtils.java b/library/src/main/java/top/trumeet/snippet/aospanimation/library/animation/AppearAnimationUtils.java
new file mode 100644
index 0000000..75237a6
--- /dev/null
+++ b/library/src/main/java/top/trumeet/snippet/aospanimation/library/animation/AppearAnimationUtils.java
@@ -0,0 +1,254 @@
+/*
+ * Copyright (C) 2015 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License
+ */
+
+package top.trumeet.snippet.aospanimation.library.animation;
+
+import android.animation.Animator;
+import android.animation.AnimatorListenerAdapter;
+import android.animation.ObjectAnimator;
+import android.annotation.TargetApi;
+import android.content.Context;
+import android.view.RenderNodeAnimator;
+import android.view.View;
+import android.view.animation.AnimationUtils;
+import android.view.animation.Interpolator;
+
+import top.trumeet.snippet.aospanimation.library.R;
+
+/**
+ * A class to make nice appear transitions for views in a tabular layout.
+ *
+ * TODO: use non-hidden apis and support pre-lollipop roms
+ */
+@TargetApi(21)
+public class AppearAnimationUtils implements AppearAnimationCreator<View> {
+
+    public static final long DEFAULT_APPEAR_DURATION = 220;
+
+    private final Interpolator mInterpolator;
+    private final float mStartTranslation;
+    private final AppearAnimationProperties mProperties = new AppearAnimationProperties();
+    protected final float mDelayScale;
+    private final long mDuration;
+    protected RowTranslationScaler mRowTranslationScaler;
+    protected boolean mAppearing;
+
+    public AppearAnimationUtils(Context ctx) {
+        this(ctx, DEFAULT_APPEAR_DURATION,
+                1.0f, 1.0f,
+                AnimationUtils.loadInterpolator(ctx, android.R.interpolator.linear_out_slow_in));
+    }
+
+    public AppearAnimationUtils(Context ctx, long duration, float translationScaleFactor,
+            float delayScaleFactor, Interpolator interpolator) {
+        mInterpolator = interpolator;
+        mStartTranslation = ctx.getResources().getDimensionPixelOffset(
+                R.dimen.appear_y_translation_start) * translationScaleFactor;
+        mDelayScale = delayScaleFactor;
+        mDuration = duration;
+        mAppearing = true;
+    }
+
+    public void startAnimation2d(View[][] objects, final Runnable finishListener) {
+        startAnimation2d(objects, finishListener, this);
+    }
+
+    public void startAnimation(View[] objects, final Runnable finishListener) {
+        startAnimation(objects, finishListener, this);
+    }
+
+    public <T> void startAnimation2d(T[][] objects, final Runnable finishListener,
+            AppearAnimationCreator<T> creator) {
+        AppearAnimationProperties properties = getDelays(objects);
+        startAnimations(properties, objects, finishListener, creator);
+    }
+
+    public <T> void startAnimation(T[] objects, final Runnable finishListener,
+            AppearAnimationCreator<T> creator) {
+        AppearAnimationProperties properties = getDelays(objects);
+        startAnimations(properties, objects, finishListener, creator);
+    }
+
+    private <T> void startAnimations(AppearAnimationProperties properties, T[] objects,
+            final Runnable finishListener, AppearAnimationCreator<T> creator) {
+        if (properties.maxDelayRowIndex == -1 || properties.maxDelayColIndex == -1) {
+            finishListener.run();
+            return;
+        }
+        for (int row = 0; row < properties.delays.length; row++) {
+            long[] columns = properties.delays[row];
+            long delay = columns[0];
+            Runnable endRunnable = null;
+            if (properties.maxDelayRowIndex == row && properties.maxDelayColIndex == 0) {
+                endRunnable = finishListener;
+            }
+            float translationScale = mRowTranslationScaler != null
+                    ? mRowTranslationScaler.getRowTranslationScale(row, properties.delays.length)
+                    : 1f;
+            float translation = translationScale * mStartTranslation;
+            creator.createAnimation(objects[row], delay, mDuration,
+                    mAppearing ? translation : -translation,
+                    mAppearing, mInterpolator, endRunnable);
+        }
+    }
+
+    private <T> void startAnimations(AppearAnimationProperties properties, T[][] objects,
+            final Runnable finishListener, AppearAnimationCreator<T> creator) {
+        if (properties.maxDelayRowIndex == -1 || properties.maxDelayColIndex == -1) {
+            if (finishListener != null) finishListener.run();
+            return;
+        }
+        for (int row = 0; row < properties.delays.length; row++) {
+            long[] columns = properties.delays[row];
+            float translationScale = mRowTranslationScaler != null
+                    ? mRowTranslationScaler.getRowTranslationScale(row, properties.delays.length)
+                    : 1f;
+            float translation = translationScale * mStartTranslation;
+            for (int col = 0; col < columns.length; col++) {
+                long delay = columns[col];
+                Runnable endRunnable = null;
+                if (properties.maxDelayRowIndex == row && properties.maxDelayColIndex == col) {
+                    endRunnable = finishListener;
+                }
+                creator.createAnimation(objects[row][col], delay, mDuration,
+                        mAppearing ? translation : -translation,
+                        mAppearing, mInterpolator, endRunnable);
+            }
+        }
+    }
+
+    private <T> AppearAnimationProperties getDelays(T[] items) {
+        long maxDelay = -1;
+        mProperties.maxDelayColIndex = -1;
+        mProperties.maxDelayRowIndex = -1;
+        mProperties.delays = new long[items.length][];
+        for (int row = 0; row < items.length; row++) {
+            mProperties.delays[row] = new long[1];
+            long delay = calculateDelay(row, 0);
+            mProperties.delays[row][0] = delay;
+            if (items[row] != null && delay > maxDelay) {
+                maxDelay = delay;
+                mProperties.maxDelayColIndex = 0;
+                mProperties.maxDelayRowIndex = row;
+            }
+        }
+        return mProperties;
+    }
+
+    private <T> AppearAnimationProperties getDelays(T[][] items) {
+        long maxDelay = -1;
+        mProperties.maxDelayColIndex = -1;
+        mProperties.maxDelayRowIndex = -1;
+        mProperties.delays = new long[items.length][];
+        for (int row = 0; row < items.length; row++) {
+            T[] columns = items[row];
+            mProperties.delays[row] = new long[columns.length];
+            for (int col = 0; col < columns.length; col++) {
+                long delay = calculateDelay(row, col);
+                mProperties.delays[row][col] = delay;
+                if (items[row][col] != null && delay > maxDelay) {
+                    maxDelay = delay;
+                    mProperties.maxDelayColIndex = col;
+                    mProperties.maxDelayRowIndex = row;
+                }
+            }
+        }
+        return mProperties;
+    }
+
+    protected long calculateDelay(int row, int col) {
+        return (long) ((row * 40 + col * (Math.pow(row, 0.4) + 0.4) * 20) * mDelayScale);
+    }
+
+    public Interpolator getInterpolator() {
+        return mInterpolator;
+    }
+
+    public float getStartTranslation() {
+        return mStartTranslation;
+    }
+
+    @Override
+    public void createAnimation(final View view, long delay, long duration, float translationY,
+            boolean appearing, Interpolator interpolator, final Runnable endRunnable) {
+        if (view != null) {
+            view.setAlpha(appearing ? 0f : 1.0f);
+            view.setTranslationY(appearing ? translationY : 0);
+            Animator alphaAnim;
+            float targetAlpha =  appearing ? 1f : 0f;
+            if (view.isHardwareAccelerated()) {
+                // TODO: Use non-hidden and compat API
+                RenderNodeAnimator alphaAnimRt = new RenderNodeAnimator(RenderNodeAnimator.ALPHA,
+                        targetAlpha);
+                alphaAnimRt.setTarget(view);
+                alphaAnim = alphaAnimRt;
+            } else {
+                alphaAnim = ObjectAnimator.ofFloat(view, View.ALPHA, view.getAlpha(), targetAlpha);
+            }
+            alphaAnim.setInterpolator(interpolator);
+            alphaAnim.setDuration(duration);
+            alphaAnim.setStartDelay(delay);
+            if (view.hasOverlappingRendering()) {
+                view.setLayerType(View.LAYER_TYPE_HARDWARE, null);
+                alphaAnim.addListener(new AnimatorListenerAdapter() {
+                    @Override
+                    public void onAnimationEnd(Animator animation) {
+                        view.setLayerType(View.LAYER_TYPE_NONE, null);
+                    }
+                });
+            }
+            if (endRunnable != null) {
+                alphaAnim.addListener(new AnimatorListenerAdapter() {
+                    @Override
+                    public void onAnimationEnd(Animator animation) {
+                        endRunnable.run();
+                    }
+                });
+            }
+            alphaAnim.start();
+            startTranslationYAnimation(view, delay, duration, appearing ? 0 : translationY,
+                    interpolator);
+        }
+    }
+
+    public static void startTranslationYAnimation(View view, long delay, long duration,
+            float endTranslationY, Interpolator interpolator) {
+        Animator translationAnim;
+        if (view.isHardwareAccelerated()) {
+            RenderNodeAnimator translationAnimRt = new RenderNodeAnimator(
+                    RenderNodeAnimator.TRANSLATION_Y, endTranslationY);
+            translationAnimRt.setTarget(view);
+            translationAnim = translationAnimRt;
+        } else {
+            translationAnim = ObjectAnimator.ofFloat(view, View.TRANSLATION_Y,
+                    view.getTranslationY(), endTranslationY);
+        }
+        translationAnim.setInterpolator(interpolator);
+        translationAnim.setDuration(duration);
+        translationAnim.setStartDelay(delay);
+        translationAnim.start();
+    }
+
+    public class AppearAnimationProperties {
+        public long[][] delays;
+        public int maxDelayRowIndex;
+        public int maxDelayColIndex;
+    }
+
+    public interface RowTranslationScaler {
+        float getRowTranslationScale(int row, int numRows);
+    }
+}
diff --git a/library/src/main/java/top/trumeet/snippet/aospanimation/library/animation/DisappearAnimationUtils.java b/library/src/main/java/top/trumeet/snippet/aospanimation/library/animation/DisappearAnimationUtils.java
new file mode 100644
index 0000000..42c99e1
--- /dev/null
+++ b/library/src/main/java/top/trumeet/snippet/aospanimation/library/animation/DisappearAnimationUtils.java
@@ -0,0 +1,58 @@
+/*
+ * Copyright (C) 2015 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License
+ */
+
+package top.trumeet.snippet.aospanimation.library.animation;
+
+import android.content.Context;
+import android.view.animation.AnimationUtils;
+import android.view.animation.Interpolator;
+
+/**
+ * A class to make nice disappear transitions for views in a tabular layout.
+ */
+public class DisappearAnimationUtils extends AppearAnimationUtils {
+
+    public DisappearAnimationUtils(Context ctx) {
+        this(ctx, DEFAULT_APPEAR_DURATION,
+                1.0f, 1.0f,
+                AnimationUtils.loadInterpolator(ctx, android.R.interpolator.fast_out_linear_in));
+    }
+
+    public DisappearAnimationUtils(Context ctx, long duration, float translationScaleFactor,
+            float delayScaleFactor, Interpolator interpolator) {
+        this(ctx, duration, translationScaleFactor, delayScaleFactor, interpolator,
+                ROW_TRANSLATION_SCALER);
+    }
+
+    public DisappearAnimationUtils(Context ctx, long duration, float translationScaleFactor,
+            float delayScaleFactor, Interpolator interpolator, RowTranslationScaler rowScaler) {
+        super(ctx, duration, translationScaleFactor, delayScaleFactor, interpolator);
+        mRowTranslationScaler = rowScaler;
+        mAppearing = false;
+    }
+
+    protected long calculateDelay(int row, int col) {
+        return (long) ((row * 60 + col * (Math.pow(row, 0.4) + 0.4) * 10) * mDelayScale);
+    }
+
+    private static final RowTranslationScaler ROW_TRANSLATION_SCALER = new RowTranslationScaler() {
+
+        @Override
+        public float getRowTranslationScale(int row, int numRows) {
+            return (float) (Math.pow((numRows - row), 2) / numRows);
+        }
+    };
+}
diff --git a/library/src/main/res/anim/confirm_credential_close_enter.xml b/library/src/main/res/anim/confirm_credential_close_enter.xml
new file mode 100644
index 0000000..fcc3241
--- /dev/null
+++ b/library/src/main/res/anim/confirm_credential_close_enter.xml
@@ -0,0 +1,30 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  ~ Copyright (C) 2015 The Android Open Source Project
+  ~
+  ~ Licensed under the Apache License, Version 2.0 (the "License");
+  ~ you may not use this file except in compliance with the License.
+  ~ You may obtain a copy of the License at
+  ~
+  ~      http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing, software
+  ~ distributed under the License is distributed on an "AS IS" BASIS,
+  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  ~ See the License for the specific language governing permissions and
+  ~ limitations under the License
+  -->
+
+<set xmlns:android="http://schemas.android.com/apk/res/android"
+    android:shareInterpolator="false"
+    android:zAdjustment="top">
+  <alpha android:fromAlpha="0.0" android:toAlpha="1.0"
+      android:interpolator="@*android:interpolator/decelerate_quart"
+      android:fillEnabled="true"
+      android:fillBefore="false" android:fillAfter="true"
+      android:duration="200"/>
+  <translate android:fromYDelta="8%" android:toYDelta="0"
+      android:fillEnabled="true" android:fillBefore="true" android:fillAfter="true"
+      android:interpolator="@*android:interpolator/decelerate_quint"
+      android:duration="350"/>
+</set>
diff --git a/library/src/main/res/anim/confirm_credential_close_exit.xml b/library/src/main/res/anim/confirm_credential_close_exit.xml
new file mode 100644
index 0000000..5afd8b2
--- /dev/null
+++ b/library/src/main/res/anim/confirm_credential_close_exit.xml
@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  ~ Copyright (C) 2015 The Android Open Source Project
+  ~
+  ~ Licensed under the Apache License, Version 2.0 (the "License");
+  ~ you may not use this file except in compliance with the License.
+  ~ You may obtain a copy of the License at
+  ~
+  ~      http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing, software
+  ~ distributed under the License is distributed on an "AS IS" BASIS,
+  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  ~ See the License for the specific language governing permissions and
+  ~ limitations under the License
+  -->
+
+<alpha xmlns:android="http://schemas.android.com/apk/res/android"
+    android:interpolator="@android:interpolator/linear_out_slow_in"
+    android:fromAlpha="1.0" android:toAlpha="0.0"
+    android:duration="350" />
diff --git a/library/src/main/res/anim/fast_out_linear_in.xml b/library/src/main/res/anim/fast_out_linear_in.xml
new file mode 100644
index 0000000..19f95a6
--- /dev/null
+++ b/library/src/main/res/anim/fast_out_linear_in.xml
@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  ~ Copyright (C) 2014 The Android Open Source Project
+  ~
+  ~ Licensed under the Apache License, Version 2.0 (the "License");
+  ~ you may not use this file except in compliance with the License.
+  ~ You may obtain a copy of the License at
+  ~
+  ~      http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing, software
+  ~ distributed under the License is distributed on an "AS IS" BASIS,
+  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  ~ See the License for the specific language governing permissions and
+  ~ limitations under the License
+  -->
+
+<pathInterpolator xmlns:android="http://schemas.android.com/apk/res/android"
+    android:controlX1="0.4"
+    android:controlY1="0"
+    android:controlX2="1"
+    android:controlY2="1"/>
diff --git a/library/src/main/res/anim/linear_out_slow_in.xml b/library/src/main/res/anim/linear_out_slow_in.xml
new file mode 100644
index 0000000..83fc223
--- /dev/null
+++ b/library/src/main/res/anim/linear_out_slow_in.xml
@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  ~ Copyright (C) 2014 The Android Open Source Project
+  ~
+  ~ Licensed under the Apache License, Version 2.0 (the "License");
+  ~ you may not use this file except in compliance with the License.
+  ~ You may obtain a copy of the License at
+  ~
+  ~      http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing, software
+  ~ distributed under the License is distributed on an "AS IS" BASIS,
+  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  ~ See the License for the specific language governing permissions and
+  ~ limitations under the License
+  -->
+
+<pathInterpolator xmlns:android="http://schemas.android.com/apk/res/android"
+    android:controlX1="0"
+    android:controlY1="0"
+    android:controlX2="0.2"
+    android:controlY2="1"/>
diff --git a/library/src/main/res/values/dimens.xml b/library/src/main/res/values/dimens.xml
index 7a84eac..6d5e6c4 100644
--- a/library/src/main/res/values/dimens.xml
+++ b/library/src/main/res/values/dimens.xml
@@ -1,4 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
     <dimen name="fingerprint_animation_size">88dp</dimen>
+
+    <!-- The y translation to apply at the start in appear animations. -->
+    <dimen name="appear_y_translation_start">32dp</dimen>
 </resources>
\ No newline at end of file