Adding AccelerometerPlay to prebuilts

Change-Id: I0ae95dc8552e92328b4c7136b5d056a3f413eab8
diff --git a/prebuilts/gradle/AccelerometerPlay/.google/packaging.yaml b/prebuilts/gradle/AccelerometerPlay/.google/packaging.yaml
new file mode 100644
index 0000000..9c6e99e
--- /dev/null
+++ b/prebuilts/gradle/AccelerometerPlay/.google/packaging.yaml
@@ -0,0 +1,20 @@
+
+# GOOGLE SAMPLE PACKAGING DATA
+#
+# This file is used by Google as part of our samples packaging process.
+# End users may safely ignore this file. It has no relevance to other systems.
+---
+status:       PUBLISHED
+technologies: [Android]
+categories:   [Sensors]
+languages:    [Java]
+solutions:    [Mobile]
+github:       android-AccelerometerPlay
+level:        ADVANCED
+icon:         screenshots/big_icon.png
+apiRefs:
+    - android:android.hardware.Sensor
+    - android:android.hardware.SensorEvent
+    - android:android.hardware.SensorEventListener
+    - android:android.hardware.SensorManager
+license: apache2
diff --git a/prebuilts/gradle/AccelerometerPlay/CONTRIBUTING.md b/prebuilts/gradle/AccelerometerPlay/CONTRIBUTING.md
new file mode 100644
index 0000000..faa8b5c
--- /dev/null
+++ b/prebuilts/gradle/AccelerometerPlay/CONTRIBUTING.md
@@ -0,0 +1,35 @@
+# How to become a contributor and submit your own code
+
+## Contributor License Agreements
+
+We'd love to accept your sample apps and patches! Before we can take them, we
+have to jump a couple of legal hurdles.
+
+Please fill out either the individual or corporate Contributor License Agreement (CLA).
+
+  * If you are an individual writing original source code and you're sure you
+    own the intellectual property, then you'll need to sign an [individual CLA]
+    (https://cla.developers.google.com).
+  * If you work for a company that wants to allow you to contribute your work,
+    then you'll need to sign a [corporate CLA]
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+
+Follow either of the two links above to access the appropriate CLA and
+instructions for how to sign and return it. Once we receive it, we'll be able to
+accept your pull requests.
+
+## Contributing A Patch
+
+1. Submit an issue describing your proposed change to the repo in question.
+1. The repo owner will respond to your issue promptly.
+1. If your proposed change is accepted, and you haven't already done so, sign a
+   Contributor License Agreement (see details above).
+1. Fork the desired repo, develop and test your code changes.
+1. Ensure that your code adheres to the existing style in the sample to which
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+   recommended coding standards for this organization.
+1. Ensure that your code has an appropriate set of unit tests which all pass.
+1. Submit a pull request.
+
diff --git a/prebuilts/gradle/AccelerometerPlay/LICENSE b/prebuilts/gradle/AccelerometerPlay/LICENSE
new file mode 100644
index 0000000..4f22946
--- /dev/null
+++ b/prebuilts/gradle/AccelerometerPlay/LICENSE
@@ -0,0 +1,647 @@
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+     TO YOU ON ANY LEGAL THEORY (INCLUDING, WITHOUT LIMITATION,
+     NEGLIGENCE) OR OTHERWISE FOR ANY DIRECT, SPECIAL, INDIRECT,
+     INCIDENTAL, CONSEQUENTIAL, PUNITIVE, EXEMPLARY, OR OTHER LOSSES,
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+     USE OF THE LICENSED MATERIAL, EVEN IF THE LICENSOR HAS BEEN
+     ADVISED OF THE POSSIBILITY OF SUCH LOSSES, COSTS, EXPENSES, OR
+     DAMAGES. WHERE A LIMITATION OF LIABILITY IS NOT ALLOWED IN FULL OR
+     IN PART, THIS LIMITATION MAY NOT APPLY TO YOU.
+
+  c. The disclaimer of warranties and limitation of liability provided
+     above shall be interpreted in a manner that, to the extent
+     possible, most closely approximates an absolute disclaimer and
+     waiver of all liability.
+
+
+Section 6 -- Term and Termination.
+
+  a. This Public License applies for the term of the Copyright and
+     Similar Rights licensed here. However, if You fail to comply with
+     this Public License, then Your rights under this Public License
+     terminate automatically.
+
+  b. Where Your right to use the Licensed Material has terminated under
+     Section 6(a), it reinstates:
+
+       1. automatically as of the date the violation is cured, provided
+          it is cured within 30 days of Your discovery of the
+          violation; or
+
+       2. upon express reinstatement by the Licensor.
+
+     For the avoidance of doubt, this Section 6(b) does not affect any
+     right the Licensor may have to seek remedies for Your violations
+     of this Public License.
+
+  c. For the avoidance of doubt, the Licensor may also offer the
+     Licensed Material under separate terms or conditions or stop
+     distributing the Licensed Material at any time; however, doing so
+     will not terminate this Public License.
+
+  d. Sections 1, 5, 6, 7, and 8 survive termination of this Public
+     License.
+
+
+Section 7 -- Other Terms and Conditions.
+
+  a. The Licensor shall not be bound by any additional or different
+     terms or conditions communicated by You unless expressly agreed.
+
+  b. Any arrangements, understandings, or agreements regarding the
+     Licensed Material not stated herein are separate from and
+     independent of the terms and conditions of this Public License.
+
+
+Section 8 -- Interpretation.
+
+  a. For the avoidance of doubt, this Public License does not, and
+     shall not be interpreted to, reduce, limit, restrict, or impose
+     conditions on any use of the Licensed Material that could lawfully
+     be made without permission under this Public License.
+
+  b. To the extent possible, if any provision of this Public License is
+     deemed unenforceable, it shall be automatically reformed to the
+     minimum extent necessary to make it enforceable. If the provision
+     cannot be reformed, it shall be severed from this Public License
+     without affecting the enforceability of the remaining terms and
+     conditions.
+
+  c. No term or condition of this Public License will be waived and no
+     failure to comply consented to unless expressly agreed to by the
+     Licensor.
+
+  d. Nothing in this Public License constitutes or may be interpreted
+     as a limitation upon, or waiver of, any privileges and immunities
+     that apply to the Licensor or You, including from the legal
+     processes of any jurisdiction or authority.
+
+=======================================================================
+
+Creative Commons is not a party to its public licenses.
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+licenses to material it publishes and in those instances will be
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+that material is shared under a Creative Commons public license or as
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+to any of its public licenses or any other arrangements,
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+the avoidance of doubt, this paragraph does not form part of the public
+licenses.
+
+Creative Commons may be contacted at creativecommons.org.
+
diff --git a/prebuilts/gradle/AccelerometerPlay/NOTICE b/prebuilts/gradle/AccelerometerPlay/NOTICE
new file mode 100644
index 0000000..29ea77b
--- /dev/null
+++ b/prebuilts/gradle/AccelerometerPlay/NOTICE
@@ -0,0 +1,16 @@
+
+This sample uses the following software:
+
+Copyright 2016 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.
diff --git a/prebuilts/gradle/AccelerometerPlay/README.md b/prebuilts/gradle/AccelerometerPlay/README.md
new file mode 100644
index 0000000..55bc126
--- /dev/null
+++ b/prebuilts/gradle/AccelerometerPlay/README.md
@@ -0,0 +1,67 @@
+
+Android AccelerometerPlay Sample
+===================================
+
+Sample demonstrating how to use an accelerometer sensor as input for a physics-based view.
+
+Introduction
+------------
+
+This sample demonstrates how to use an accelerometer [sensor][1] as input for
+a physics-based view. The input from the accelerometer is used to simulate a
+virtual surface, and a number of free-moving objects placed on top of it.
+
+<p>Any effects from the device's acceleration vector (including both gravity and
+temporary movement) will be translated to the on-screen particles.
+
+[1]: https://developer.android.com/reference/android/hardware/Sensor.html
+
+Pre-requisites
+--------------
+
+- Android SDK 23
+- Android Build Tools v24.0.0 rc1
+- Android Support Repository
+
+Screenshots
+-------------
+
+<img src="screenshots/screenshot1.png" height="400" alt="Screenshot"/> 
+
+Getting Started
+---------------
+
+This sample uses the Gradle build system. To build this project, use the
+"gradlew build" command or use "Import Project" in Android Studio.
+
+Support
+-------
+
+- Google+ Community: https://plus.google.com/communities/105153134372062985968
+- Stack Overflow: http://stackoverflow.com/questions/tagged/android
+
+If you've found an error in this sample, please file an issue:
+https://github.com/googlesamples/android-AccelerometerPlay
+
+Patches are encouraged, and may be submitted by forking this project and
+submitting a pull request through GitHub. Please see CONTRIBUTING.md for more details.
+
+License
+-------
+
+Copyright 2016 The Android Open Source Project, Inc.
+
+Licensed to the Apache Software Foundation (ASF) under one or more contributor
+license agreements.  See the NOTICE file distributed with this work for
+additional information regarding copyright ownership.  The ASF licenses this
+file to you 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.
diff --git a/prebuilts/gradle/AccelerometerPlay/app/build.gradle b/prebuilts/gradle/AccelerometerPlay/app/build.gradle
new file mode 100644
index 0000000..609f320
--- /dev/null
+++ b/prebuilts/gradle/AccelerometerPlay/app/build.gradle
@@ -0,0 +1,19 @@
+apply plugin: 'com.android.application'
+
+android {
+    compileSdkVersion 23
+    buildToolsVersion "24.0.1"
+
+    defaultConfig {
+        applicationId "com.example.android.accelerometerplay"
+        minSdkVersion 11
+        targetSdkVersion 23
+    }
+
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.txt'
+        }
+    }
+}
diff --git a/prebuilts/gradle/AccelerometerPlay/app/src/main/AndroidManifest.xml b/prebuilts/gradle/AccelerometerPlay/app/src/main/AndroidManifest.xml
new file mode 100644
index 0000000..3c3ec27
--- /dev/null
+++ b/prebuilts/gradle/AccelerometerPlay/app/src/main/AndroidManifest.xml
@@ -0,0 +1,39 @@
+<?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.
+-->
+
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+      android:versionCode="1"
+      android:versionName="1.0" package="com.example.android.accelerometerplay">
+    <application android:icon="@mipmap/ic_launcher" android:label="@string/app_name">
+        <activity android:name=".AccelerometerPlayActivity"
+                  android:label="@string/app_name"
+                  android:screenOrientation="portrait"
+                  android:theme="@android:style/Theme.NoTitleBar.Fullscreen">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+
+    </application>
+
+
+<uses-sdk android:minSdkVersion="5"></uses-sdk>
+<uses-permission android:name="android.permission.VIBRATE"></uses-permission>
+
+<uses-permission android:name="android.permission.WAKE_LOCK"></uses-permission>
+
+</manifest>
diff --git a/prebuilts/gradle/AccelerometerPlay/app/src/main/java/com/example/android/accelerometerplay/AccelerometerPlayActivity.java b/prebuilts/gradle/AccelerometerPlay/app/src/main/java/com/example/android/accelerometerplay/AccelerometerPlayActivity.java
new file mode 100644
index 0000000..b156852
--- /dev/null
+++ b/prebuilts/gradle/AccelerometerPlay/app/src/main/java/com/example/android/accelerometerplay/AccelerometerPlayActivity.java
@@ -0,0 +1,429 @@
+/*
+ * 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.accelerometerplay;
+
+import android.annotation.TargetApi;
+import android.app.Activity;
+import android.content.Context;
+import android.graphics.Bitmap;
+import android.graphics.Canvas;
+import android.graphics.BitmapFactory.Options;
+import android.hardware.Sensor;
+import android.hardware.SensorEvent;
+import android.hardware.SensorEventListener;
+import android.hardware.SensorManager;
+import android.os.Build;
+import android.os.Bundle;
+import android.os.PowerManager;
+import android.os.PowerManager.WakeLock;
+import android.util.AttributeSet;
+import android.util.DisplayMetrics;
+import android.view.Display;
+import android.view.Surface;
+import android.view.View;
+import android.view.ViewGroup;
+import android.view.WindowManager;
+import android.widget.FrameLayout;
+
+/**
+ * This is an example of using the accelerometer to integrate the device's
+ * acceleration to a position using the Verlet method. This is illustrated with
+ * a very simple particle system comprised of a few iron balls freely moving on
+ * an inclined wooden table. The inclination of the virtual table is controlled
+ * by the device's accelerometer.
+ *
+ * @see SensorManager
+ * @see SensorEvent
+ * @see Sensor
+ */
+
+public class AccelerometerPlayActivity extends Activity {
+
+    private SimulationView mSimulationView;
+    private SensorManager mSensorManager;
+    private PowerManager mPowerManager;
+    private WindowManager mWindowManager;
+    private Display mDisplay;
+    private WakeLock mWakeLock;
+
+    /** Called when the activity is first created. */
+    @Override
+    public void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+
+        // Get an instance of the SensorManager
+        mSensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);
+
+        // Get an instance of the PowerManager
+        mPowerManager = (PowerManager) getSystemService(POWER_SERVICE);
+
+        // Get an instance of the WindowManager
+        mWindowManager = (WindowManager) getSystemService(WINDOW_SERVICE);
+        mDisplay = mWindowManager.getDefaultDisplay();
+
+        // Create a bright wake lock
+        mWakeLock = mPowerManager.newWakeLock(PowerManager.SCREEN_BRIGHT_WAKE_LOCK, getClass()
+                .getName());
+
+        // instantiate our simulation view and set it as the activity's content
+        mSimulationView = new SimulationView(this);
+        mSimulationView.setBackgroundResource(R.drawable.wood);
+        setContentView(mSimulationView);
+    }
+
+    @Override
+    protected void onResume() {
+        super.onResume();
+        /*
+         * when the activity is resumed, we acquire a wake-lock so that the
+         * screen stays on, since the user will likely not be fiddling with the
+         * screen or buttons.
+         */
+        mWakeLock.acquire();
+
+        // Start the simulation
+        mSimulationView.startSimulation();
+    }
+
+    @Override
+    protected void onPause() {
+        super.onPause();
+        /*
+         * When the activity is paused, we make sure to stop the simulation,
+         * release our sensor resources and wake locks
+         */
+
+        // Stop the simulation
+        mSimulationView.stopSimulation();
+
+        // and release our wake-lock
+        mWakeLock.release();
+    }
+
+    class SimulationView extends FrameLayout implements SensorEventListener {
+        // diameter of the balls in meters
+        private static final float sBallDiameter = 0.004f;
+        private static final float sBallDiameter2 = sBallDiameter * sBallDiameter;
+
+        private final int mDstWidth;
+        private final int mDstHeight;
+
+        private Sensor mAccelerometer;
+        private long mLastT;
+
+        private float mXDpi;
+        private float mYDpi;
+        private float mMetersToPixelsX;
+        private float mMetersToPixelsY;
+        private float mXOrigin;
+        private float mYOrigin;
+        private float mSensorX;
+        private float mSensorY;
+        private float mHorizontalBound;
+        private float mVerticalBound;
+        private final ParticleSystem mParticleSystem;
+        /*
+         * Each of our particle holds its previous and current position, its
+         * acceleration. for added realism each particle has its own friction
+         * coefficient.
+         */
+        class Particle extends View {
+            private float mPosX = (float) Math.random();
+            private float mPosY = (float) Math.random();
+            private float mVelX;
+            private float mVelY;
+
+            public Particle(Context context) {
+                super(context);
+            }
+
+            public Particle(Context context, AttributeSet attrs) {
+                super(context, attrs);
+            }
+
+            public Particle(Context context, AttributeSet attrs, int defStyleAttr) {
+                super(context, attrs, defStyleAttr);
+            }
+
+            @TargetApi(Build.VERSION_CODES.LOLLIPOP)
+            public Particle(Context context, AttributeSet attrs, int defStyleAttr,
+                            int defStyleRes) {
+                super(context, attrs, defStyleAttr, defStyleRes);
+            }
+
+            public void computePhysics(float sx, float sy, float dT) {
+
+                final float ax = -sx/5;
+                final float ay = -sy/5;
+
+                mPosX += mVelX * dT + ax * dT * dT / 2;
+                mPosY += mVelY * dT + ay * dT * dT / 2;
+
+                mVelX += ax * dT;
+                mVelY += ay * dT;
+            }
+
+            /*
+             * Resolving constraints and collisions with the Verlet integrator
+             * can be very simple, we simply need to move a colliding or
+             * constrained particle in such way that the constraint is
+             * satisfied.
+             */
+            public void resolveCollisionWithBounds() {
+                final float xmax = mHorizontalBound;
+                final float ymax = mVerticalBound;
+                final float x = mPosX;
+                final float y = mPosY;
+                if (x > xmax) {
+                    mPosX = xmax;
+                    mVelX = 0;
+                } else if (x < -xmax) {
+                    mPosX = -xmax;
+                    mVelX = 0;
+                }
+                if (y > ymax) {
+                    mPosY = ymax;
+                    mVelY = 0;
+                } else if (y < -ymax) {
+                    mPosY = -ymax;
+                    mVelY = 0;
+                }
+            }
+        }
+
+        /*
+         * A particle system is just a collection of particles
+         */
+        class ParticleSystem {
+            static final int NUM_PARTICLES = 5;
+            private Particle mBalls[] = new Particle[NUM_PARTICLES];
+
+            ParticleSystem() {
+                /*
+                 * Initially our particles have no speed or acceleration
+                 */
+                for (int i = 0; i < mBalls.length; i++) {
+                    mBalls[i] = new Particle(getContext());
+                    mBalls[i].setBackgroundResource(R.drawable.ball);
+                    mBalls[i].setLayerType(LAYER_TYPE_HARDWARE, null);
+                    addView(mBalls[i], new ViewGroup.LayoutParams(mDstWidth, mDstHeight));
+                }
+            }
+
+            /*
+             * Update the position of each particle in the system using the
+             * Verlet integrator.
+             */
+            private void updatePositions(float sx, float sy, long timestamp) {
+                final long t = timestamp;
+                if (mLastT != 0) {
+                    final float dT = (float) (t - mLastT) / 1000.f /** (1.0f / 1000000000.0f)*/;
+                        final int count = mBalls.length;
+                        for (int i = 0; i < count; i++) {
+                            Particle ball = mBalls[i];
+                            ball.computePhysics(sx, sy, dT);
+                        }
+                }
+                mLastT = t;
+            }
+
+            /*
+             * Performs one iteration of the simulation. First updating the
+             * position of all the particles and resolving the constraints and
+             * collisions.
+             */
+            public void update(float sx, float sy, long now) {
+                // update the system's positions
+                updatePositions(sx, sy, now);
+
+                // We do no more than a limited number of iterations
+                final int NUM_MAX_ITERATIONS = 10;
+
+                /*
+                 * Resolve collisions, each particle is tested against every
+                 * other particle for collision. If a collision is detected the
+                 * particle is moved away using a virtual spring of infinite
+                 * stiffness.
+                 */
+                boolean more = true;
+                final int count = mBalls.length;
+                for (int k = 0; k < NUM_MAX_ITERATIONS && more; k++) {
+                    more = false;
+                    for (int i = 0; i < count; i++) {
+                        Particle curr = mBalls[i];
+                        for (int j = i + 1; j < count; j++) {
+                            Particle ball = mBalls[j];
+                            float dx = ball.mPosX - curr.mPosX;
+                            float dy = ball.mPosY - curr.mPosY;
+                            float dd = dx * dx + dy * dy;
+                            // Check for collisions
+                            if (dd <= sBallDiameter2) {
+                                /*
+                                 * add a little bit of entropy, after nothing is
+                                 * perfect in the universe.
+                                 */
+                                dx += ((float) Math.random() - 0.5f) * 0.0001f;
+                                dy += ((float) Math.random() - 0.5f) * 0.0001f;
+                                dd = dx * dx + dy * dy;
+                                // simulate the spring
+                                final float d = (float) Math.sqrt(dd);
+                                final float c = (0.5f * (sBallDiameter - d)) / d;
+                                final float effectX = dx * c;
+                                final float effectY = dy * c;
+                                curr.mPosX -= effectX;
+                                curr.mPosY -= effectY;
+                                ball.mPosX += effectX;
+                                ball.mPosY += effectY;
+                                more = true;
+                            }
+                        }
+                        curr.resolveCollisionWithBounds();
+                    }
+                }
+            }
+
+            public int getParticleCount() {
+                return mBalls.length;
+            }
+
+            public float getPosX(int i) {
+                return mBalls[i].mPosX;
+            }
+
+            public float getPosY(int i) {
+                return mBalls[i].mPosY;
+            }
+        }
+
+        public void startSimulation() {
+            /*
+             * It is not necessary to get accelerometer events at a very high
+             * rate, by using a slower rate (SENSOR_DELAY_UI), we get an
+             * automatic low-pass filter, which "extracts" the gravity component
+             * of the acceleration. As an added benefit, we use less power and
+             * CPU resources.
+             */
+            mSensorManager.registerListener(this, mAccelerometer, SensorManager.SENSOR_DELAY_GAME);
+        }
+
+        public void stopSimulation() {
+            mSensorManager.unregisterListener(this);
+        }
+
+        public SimulationView(Context context) {
+            super(context);
+            mAccelerometer = mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
+
+            DisplayMetrics metrics = new DisplayMetrics();
+            getWindowManager().getDefaultDisplay().getMetrics(metrics);
+            mXDpi = metrics.xdpi;
+            mYDpi = metrics.ydpi;
+            mMetersToPixelsX = mXDpi / 0.0254f;
+            mMetersToPixelsY = mYDpi / 0.0254f;
+
+            // rescale the ball so it's about 0.5 cm on screen
+            mDstWidth = (int) (sBallDiameter * mMetersToPixelsX + 0.5f);
+            mDstHeight = (int) (sBallDiameter * mMetersToPixelsY + 0.5f);
+            mParticleSystem = new ParticleSystem();
+
+            Options opts = new Options();
+            opts.inDither = true;
+            opts.inPreferredConfig = Bitmap.Config.RGB_565;
+        }
+
+        @Override
+        protected void onSizeChanged(int w, int h, int oldw, int oldh) {
+            // compute the origin of the screen relative to the origin of
+            // the bitmap
+            mXOrigin = (w - mDstWidth) * 0.5f;
+            mYOrigin = (h - mDstHeight) * 0.5f;
+            mHorizontalBound = ((w / mMetersToPixelsX - sBallDiameter) * 0.5f);
+            mVerticalBound = ((h / mMetersToPixelsY - sBallDiameter) * 0.5f);
+        }
+
+        @Override
+        public void onSensorChanged(SensorEvent event) {
+            if (event.sensor.getType() != Sensor.TYPE_ACCELEROMETER)
+                return;
+            /*
+             * record the accelerometer data, the event's timestamp as well as
+             * the current time. The latter is needed so we can calculate the
+             * "present" time during rendering. In this application, we need to
+             * take into account how the screen is rotated with respect to the
+             * sensors (which always return data in a coordinate space aligned
+             * to with the screen in its native orientation).
+             */
+
+            switch (mDisplay.getRotation()) {
+                case Surface.ROTATION_0:
+                    mSensorX = event.values[0];
+                    mSensorY = event.values[1];
+                    break;
+                case Surface.ROTATION_90:
+                    mSensorX = -event.values[1];
+                    mSensorY = event.values[0];
+                    break;
+                case Surface.ROTATION_180:
+                    mSensorX = -event.values[0];
+                    mSensorY = -event.values[1];
+                    break;
+                case Surface.ROTATION_270:
+                    mSensorX = event.values[1];
+                    mSensorY = -event.values[0];
+                    break;
+            }
+        }
+
+        @Override
+        protected void onDraw(Canvas canvas) {
+            /*
+             * Compute the new position of our object, based on accelerometer
+             * data and present time.
+             */
+            final ParticleSystem particleSystem = mParticleSystem;
+            final long now = System.currentTimeMillis();
+            final float sx = mSensorX;
+            final float sy = mSensorY;
+
+            particleSystem.update(sx, sy, now);
+
+            final float xc = mXOrigin;
+            final float yc = mYOrigin;
+            final float xs = mMetersToPixelsX;
+            final float ys = mMetersToPixelsY;
+            final int count = particleSystem.getParticleCount();
+            for (int i = 0; i < count; i++) {
+                /*
+                 * We transform the canvas so that the coordinate system matches
+                 * the sensors coordinate system with the origin in the center
+                 * of the screen and the unit is the meter.
+                 */
+                final float x = xc + particleSystem.getPosX(i) * xs;
+                final float y = yc - particleSystem.getPosY(i) * ys;
+                particleSystem.mBalls[i].setTranslationX(x);
+                particleSystem.mBalls[i].setTranslationY(y);
+            }
+
+            // and make sure to redraw asap
+            invalidate();
+        }
+
+        @Override
+        public void onAccuracyChanged(Sensor sensor, int accuracy) {
+        }
+    }
+}
diff --git a/prebuilts/gradle/AccelerometerPlay/app/src/main/res/drawable-hdpi/ball.png b/prebuilts/gradle/AccelerometerPlay/app/src/main/res/drawable-hdpi/ball.png
new file mode 100644
index 0000000..e79e4d6
--- /dev/null
+++ b/prebuilts/gradle/AccelerometerPlay/app/src/main/res/drawable-hdpi/ball.png
Binary files differ
diff --git a/prebuilts/gradle/AccelerometerPlay/app/src/main/res/drawable-hdpi/wood.jpg b/prebuilts/gradle/AccelerometerPlay/app/src/main/res/drawable-hdpi/wood.jpg
new file mode 100644
index 0000000..883f491
--- /dev/null
+++ b/prebuilts/gradle/AccelerometerPlay/app/src/main/res/drawable-hdpi/wood.jpg
Binary files differ
diff --git a/prebuilts/gradle/AccelerometerPlay/app/src/main/res/layout/main.xml b/prebuilts/gradle/AccelerometerPlay/app/src/main/res/layout/main.xml
new file mode 100644
index 0000000..c69b222
--- /dev/null
+++ b/prebuilts/gradle/AccelerometerPlay/app/src/main/res/layout/main.xml
@@ -0,0 +1,23 @@
+<?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.
+-->
+
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:orientation="vertical"
+    android:layout_width="fill_parent"
+    android:layout_height="fill_parent"
+    android:background="@drawable/wood"
+    >
+</FrameLayout>
diff --git a/prebuilts/gradle/AccelerometerPlay/app/src/main/res/mipmap-hdpi/ic_launcher.png b/prebuilts/gradle/AccelerometerPlay/app/src/main/res/mipmap-hdpi/ic_launcher.png
new file mode 100644
index 0000000..800c556
--- /dev/null
+++ b/prebuilts/gradle/AccelerometerPlay/app/src/main/res/mipmap-hdpi/ic_launcher.png
Binary files differ
diff --git a/prebuilts/gradle/AccelerometerPlay/app/src/main/res/mipmap-mdpi/ic_launcher.png b/prebuilts/gradle/AccelerometerPlay/app/src/main/res/mipmap-mdpi/ic_launcher.png
new file mode 100644
index 0000000..1d6e9e5
--- /dev/null
+++ b/prebuilts/gradle/AccelerometerPlay/app/src/main/res/mipmap-mdpi/ic_launcher.png
Binary files differ
diff --git a/prebuilts/gradle/AccelerometerPlay/app/src/main/res/mipmap-xhdpi/ic_launcher.png b/prebuilts/gradle/AccelerometerPlay/app/src/main/res/mipmap-xhdpi/ic_launcher.png
new file mode 100644
index 0000000..2989356
--- /dev/null
+++ b/prebuilts/gradle/AccelerometerPlay/app/src/main/res/mipmap-xhdpi/ic_launcher.png
Binary files differ
diff --git a/prebuilts/gradle/AccelerometerPlay/app/src/main/res/mipmap-xxhdpi/ic_launcher.png b/prebuilts/gradle/AccelerometerPlay/app/src/main/res/mipmap-xxhdpi/ic_launcher.png
new file mode 100644
index 0000000..56b87a2
--- /dev/null
+++ b/prebuilts/gradle/AccelerometerPlay/app/src/main/res/mipmap-xxhdpi/ic_launcher.png
Binary files differ
diff --git a/prebuilts/gradle/AccelerometerPlay/app/src/main/res/mipmap-xxxhdpi/ic_launcher.png b/prebuilts/gradle/AccelerometerPlay/app/src/main/res/mipmap-xxxhdpi/ic_launcher.png
new file mode 100644
index 0000000..5005433
--- /dev/null
+++ b/prebuilts/gradle/AccelerometerPlay/app/src/main/res/mipmap-xxxhdpi/ic_launcher.png
Binary files differ
diff --git a/prebuilts/gradle/AccelerometerPlay/app/src/main/res/values/strings.xml b/prebuilts/gradle/AccelerometerPlay/app/src/main/res/values/strings.xml
new file mode 100644
index 0000000..6e3785e
--- /dev/null
+++ b/prebuilts/gradle/AccelerometerPlay/app/src/main/res/values/strings.xml
@@ -0,0 +1,19 @@
+<?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.
+-->
+
+<resources>
+    <string name="app_name">AccelerometerPlay</string>
+</resources>
diff --git a/prebuilts/gradle/AccelerometerPlay/build.gradle b/prebuilts/gradle/AccelerometerPlay/build.gradle
new file mode 100644
index 0000000..ea234b2
--- /dev/null
+++ b/prebuilts/gradle/AccelerometerPlay/build.gradle
@@ -0,0 +1,26 @@
+// Top-level build file where you can add configuration options common to all sub-projects/modules.
+buildscript {
+    repositories {
+        jcenter()
+    }
+    dependencies {
+        classpath 'com.android.tools.build:gradle:2.1.3'
+    }
+}
+
+allprojects {
+    repositories {
+        jcenter()
+    }
+}
+
+
+
+
+
+
+
+
+
+
+
diff --git a/prebuilts/gradle/AccelerometerPlay/gradle/wrapper/gradle-wrapper.jar b/prebuilts/gradle/AccelerometerPlay/gradle/wrapper/gradle-wrapper.jar
new file mode 100644
index 0000000..13372ae
--- /dev/null
+++ b/prebuilts/gradle/AccelerometerPlay/gradle/wrapper/gradle-wrapper.jar
Binary files differ
diff --git a/prebuilts/gradle/AccelerometerPlay/gradle/wrapper/gradle-wrapper.properties b/prebuilts/gradle/AccelerometerPlay/gradle/wrapper/gradle-wrapper.properties
new file mode 100644
index 0000000..98d19c3
--- /dev/null
+++ b/prebuilts/gradle/AccelerometerPlay/gradle/wrapper/gradle-wrapper.properties
@@ -0,0 +1,6 @@
+#Tue Aug 16 14:25:21 PDT 2016
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-2.14.1-all.zip
diff --git a/prebuilts/gradle/AccelerometerPlay/gradlew b/prebuilts/gradle/AccelerometerPlay/gradlew
new file mode 100755
index 0000000..9d82f78
--- /dev/null
+++ b/prebuilts/gradle/AccelerometerPlay/gradlew
@@ -0,0 +1,160 @@
+#!/usr/bin/env bash
+
+##############################################################################
+##
+##  Gradle start up script for UN*X
+##
+##############################################################################
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS=""
+
+APP_NAME="Gradle"
+APP_BASE_NAME=`basename "$0"`
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD="maximum"
+
+warn ( ) {
+    echo "$*"
+}
+
+die ( ) {
+    echo
+    echo "$*"
+    echo
+    exit 1
+}
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+case "`uname`" in
+  CYGWIN* )
+    cygwin=true
+    ;;
+  Darwin* )
+    darwin=true
+    ;;
+  MINGW* )
+    msys=true
+    ;;
+esac
+
+# Attempt to set APP_HOME
+# Resolve links: $0 may be a link
+PRG="$0"
+# Need this for relative symlinks.
+while [ -h "$PRG" ] ; do
+    ls=`ls -ld "$PRG"`
+    link=`expr "$ls" : '.*-> \(.*\)$'`
+    if expr "$link" : '/.*' > /dev/null; then
+        PRG="$link"
+    else
+        PRG=`dirname "$PRG"`"/$link"
+    fi
+done
+SAVED="`pwd`"
+cd "`dirname \"$PRG\"`/" >/dev/null
+APP_HOME="`pwd -P`"
+cd "$SAVED" >/dev/null
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD="$JAVA_HOME/jre/sh/java"
+    else
+        JAVACMD="$JAVA_HOME/bin/java"
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD="java"
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if [ "$cygwin" = "false" -a "$darwin" = "false" ] ; then
+    MAX_FD_LIMIT=`ulimit -H -n`
+    if [ $? -eq 0 ] ; then
+        if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
+            MAX_FD="$MAX_FD_LIMIT"
+        fi
+        ulimit -n $MAX_FD
+        if [ $? -ne 0 ] ; then
+            warn "Could not set maximum file descriptor limit: $MAX_FD"
+        fi
+    else
+        warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
+    fi
+fi
+
+# For Darwin, add options to specify how the application appears in the dock
+if $darwin; then
+    GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
+fi
+
+# For Cygwin, switch paths to Windows format before running java
+if $cygwin ; then
+    APP_HOME=`cygpath --path --mixed "$APP_HOME"`
+    CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
+    JAVACMD=`cygpath --unix "$JAVACMD"`
+
+    # We build the pattern for arguments to be converted via cygpath
+    ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
+    SEP=""
+    for dir in $ROOTDIRSRAW ; do
+        ROOTDIRS="$ROOTDIRS$SEP$dir"
+        SEP="|"
+    done
+    OURCYGPATTERN="(^($ROOTDIRS))"
+    # Add a user-defined pattern to the cygpath arguments
+    if [ "$GRADLE_CYGPATTERN" != "" ] ; then
+        OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
+    fi
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    i=0
+    for arg in "$@" ; do
+        CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
+        CHECK2=`echo "$arg"|egrep -c "^-"`                                 ### Determine if an option
+
+        if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then                    ### Added a condition
+            eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
+        else
+            eval `echo args$i`="\"$arg\""
+        fi
+        i=$((i+1))
+    done
+    case $i in
+        (0) set -- ;;
+        (1) set -- "$args0" ;;
+        (2) set -- "$args0" "$args1" ;;
+        (3) set -- "$args0" "$args1" "$args2" ;;
+        (4) set -- "$args0" "$args1" "$args2" "$args3" ;;
+        (5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
+        (6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
+        (7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
+        (8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
+        (9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
+    esac
+fi
+
+# Split up the JVM_OPTS And GRADLE_OPTS values into an array, following the shell quoting and substitution rules
+function splitJvmOpts() {
+    JVM_OPTS=("$@")
+}
+eval splitJvmOpts $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS
+JVM_OPTS[${#JVM_OPTS[*]}]="-Dorg.gradle.appname=$APP_BASE_NAME"
+
+exec "$JAVACMD" "${JVM_OPTS[@]}" -classpath "$CLASSPATH" org.gradle.wrapper.GradleWrapperMain "$@"
diff --git a/prebuilts/gradle/AccelerometerPlay/gradlew.bat b/prebuilts/gradle/AccelerometerPlay/gradlew.bat
new file mode 100644
index 0000000..8a0b282
--- /dev/null
+++ b/prebuilts/gradle/AccelerometerPlay/gradlew.bat
@@ -0,0 +1,90 @@
+@if "%DEBUG%" == "" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS=
+
+set DIRNAME=%~dp0
+if "%DIRNAME%" == "" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if "%ERRORLEVEL%" == "0" goto init
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto init
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:init
+@rem Get command-line arguments, handling Windowz variants
+
+if not "%OS%" == "Windows_NT" goto win9xME_args
+if "%@eval[2+2]" == "4" goto 4NT_args
+
+:win9xME_args
+@rem Slurp the command line arguments.
+set CMD_LINE_ARGS=
+set _SKIP=2
+
+:win9xME_args_slurp
+if "x%~1" == "x" goto execute
+
+set CMD_LINE_ARGS=%*
+goto execute
+
+:4NT_args
+@rem Get arguments from the 4NT Shell from JP Software
+set CMD_LINE_ARGS=%$
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS%
+
+:end
+@rem End local scope for the variables with windows NT shell
+if "%ERRORLEVEL%"=="0" goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+exit /b 1
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega
diff --git a/prebuilts/gradle/AccelerometerPlay/screenshots/big_icon.png b/prebuilts/gradle/AccelerometerPlay/screenshots/big_icon.png
new file mode 100644
index 0000000..4011568
--- /dev/null
+++ b/prebuilts/gradle/AccelerometerPlay/screenshots/big_icon.png
Binary files differ
diff --git a/prebuilts/gradle/AccelerometerPlay/screenshots/screenshot1.png b/prebuilts/gradle/AccelerometerPlay/screenshots/screenshot1.png
new file mode 100644
index 0000000..f1abe0e
--- /dev/null
+++ b/prebuilts/gradle/AccelerometerPlay/screenshots/screenshot1.png
Binary files differ
diff --git a/prebuilts/gradle/AccelerometerPlay/settings.gradle b/prebuilts/gradle/AccelerometerPlay/settings.gradle
new file mode 100644
index 0000000..e7b4def
--- /dev/null
+++ b/prebuilts/gradle/AccelerometerPlay/settings.gradle
@@ -0,0 +1 @@
+include ':app'