demo for new reversing behavior in Animator

Change-Id: I50c736ce504105101f71551d6074750dca9d1391

samples/ApiDemos/AndroidManifest.xml

@@ -831,6 +831,13 @@
             </intent-filter>
         </activity>
 
+        <activity android:name=".animation.ReversingAnimation" android:label="Animation/Reversing">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.SAMPLE_CODE" />
+            </intent-filter>
+        </activity>
+
         <!-- ************************************* -->
         <!--     ANIMATION PACKAGE SAMPLES         -->
         <!-- ************************************* -->

samples/ApiDemos/res/layout/animation_reversing.xml

@@ -0,0 +1,40 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2010 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.
+-->
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:orientation="vertical"
+    android:layout_width="fill_parent"
+    android:layout_height="fill_parent"
+    android:id="@+id/container"
+    >
+    <LinearLayout
+        android:orientation="horizontal"
+        android:layout_width="fill_parent"
+        android:layout_height="wrap_content"
+        >
+        <Button
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="Play"
+            android:id="@+id/startButton"
+            />
+        <Button
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="Reverse"
+            android:id="@+id/reverseButton"
+            />
+    </LinearLayout>
+</LinearLayout>

samples/ApiDemos/src/com/example/android/apis/animation/ReversingAnimation.java

@@ -0,0 +1,142 @@
+/*
+ * Copyright (C) 2010 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 com.example.android.apis.animation;
+
+// Need the following import to get access to the app resources, since this
+// class is in a sub-package.
+import com.example.android.apis.R;
+
+import java.util.ArrayList;
+
+import android.animation.Animatable;
+import android.animation.Animator;
+import android.animation.PropertyAnimator;
+import android.animation.Sequencer;
+import android.animation.Animatable.AnimatableListener;
+import android.app.Activity;
+import android.content.Context;
+import android.graphics.Canvas;
+import android.graphics.Paint;
+import android.graphics.RadialGradient;
+import android.graphics.Shader;
+import android.graphics.drawable.ShapeDrawable;
+import android.graphics.drawable.shapes.OvalShape;
+import android.os.Bundle;
+import android.view.View;
+import android.view.animation.AccelerateInterpolator;
+import android.widget.Button;
+import android.widget.LinearLayout;
+
+public class ReversingAnimation extends Activity {
+
+    @Override
+    public void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.animation_reversing);
+        LinearLayout container = (LinearLayout) findViewById(R.id.container);
+        final MyAnimationView animView = new MyAnimationView(this);
+        container.addView(animView);
+
+        Button starter = (Button) findViewById(R.id.startButton);
+        starter.setOnClickListener(new View.OnClickListener() {
+
+            @Override
+            public void onClick(View v) {
+                animView.startAnimation();
+            }
+        });
+
+        Button reverser = (Button) findViewById(R.id.reverseButton);
+        reverser.setOnClickListener(new View.OnClickListener() {
+
+            @Override
+            public void onClick(View v) {
+                animView.reverseAnimation();
+            }
+        });
+
+    }
+
+    public class MyAnimationView extends View implements Animator.AnimatorUpdateListener {
+
+        public final ArrayList<ShapeHolder> balls = new ArrayList<ShapeHolder>();
+        Animator bounceAnim = null;
+        ShapeHolder ball = null;
+
+        public MyAnimationView(Context context) {
+            super(context);
+            ball = createBall(25, 25);
+        }
+
+        private void createAnimation() {
+            if (bounceAnim == null) {
+                bounceAnim = new PropertyAnimator(1500, ball, "y",
+                        ball.getY(), getHeight() - 50f);
+                bounceAnim.setInterpolator(new AccelerateInterpolator(2f));
+                bounceAnim.addUpdateListener(this);
+            }
+        }
+
+        public void startAnimation() {
+            createAnimation();
+            bounceAnim.start();
+        }
+
+        public void reverseAnimation() {
+            createAnimation();
+            bounceAnim.reverse();
+        }
+
+        public void seek(long seekTime) {
+            createAnimation();
+            bounceAnim.setCurrentPlayTime(seekTime);
+        }
+
+        private ShapeHolder createBall(float x, float y) {
+            OvalShape circle = new OvalShape();
+            circle.resize(50f, 50f);
+            ShapeDrawable drawable = new ShapeDrawable(circle);
+            ShapeHolder shapeHolder = new ShapeHolder(drawable);
+            shapeHolder.setX(x - 25f);
+            shapeHolder.setY(y - 25f);
+            int red = (int)(Math.random() * 255);
+            int green = (int)(Math.random() * 255);
+            int blue = (int)(Math.random() * 255);
+            int color = 0xff000000 | red << 16 | green << 8 | blue;
+            Paint paint = drawable.getPaint(); //new Paint(Paint.ANTI_ALIAS_FLAG);
+            int darkColor = 0xff000000 | red/4 << 16 | green/4 << 8 | blue/4;
+            RadialGradient gradient = new RadialGradient(37.5f, 12.5f,
+                    50f, color, darkColor, Shader.TileMode.CLAMP);
+            paint.setShader(gradient);
+            shapeHolder.setPaint(paint);
+            return shapeHolder;
+        }
+
+        @Override
+        protected void onDraw(Canvas canvas) {
+            canvas.save();
+            canvas.translate(ball.getX(), ball.getY());
+            ball.getShape().draw(canvas);
+            canvas.restore();
+        }
+
+        public void onAnimationUpdate(Animator animation) {
+            invalidate();
+        }
+
+    }
+}