add sensor graph sample

sensor-graph/README.md

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+Sensor-Graph
+============
+Sensor graph is a C++ Android sample that read current accelerometer values and draw them using OpenGL.
+
+It demonstrate usage of the following Native C++ API:
+- [Sensors](http://developer.android.com/ndk/reference/group___sensor.html)
+- [Assets](http://developer.android.com/ndk/reference/group___asset.html)
+
+Pre-requisites
+--------------
+
+- Android Studio 1.3 with [NDK](https://developer.android.com/ndk/) bundle.
+
+Getting Started
+---------------
+
+1. [Download Android Studio](http://developer.android.com/sdk/index.html)
+1. Launch Android Studio.
+1. Open `android-ndk/sensor-graph` sample.
+1. Open *File/Project Structure...*
+  1. Click *Download* or *Select NDK location*.
+1. Click *Tools/Android/Sync Project with Gradle Files*.
+1. Click *Run/Run 'app'*.
+
+Screenshots
+-----------
+
+![screenshot](screenshot.png)
+
+Support
+-------
+
+If you've found an error in these samples, please [file an issue](https://github.com/googlesamples/android-ndk/issues/new).
+
+Patches are encouraged, and may be submitted by [forking this project](https://github.com/googlesamples/android-ndk/fork) and
+submitting a pull request through GitHub. Please see [CONTRIBUTING.md](CONTRIBUTING.md) for more details.
+
+- [Stack Overflow](http://stackoverflow.com/questions/tagged/android-ndk)
+- [Google+ Community](https://plus.google.com/communities/105153134372062985968)
+- [Android Tools Feedbacks](http://tools.android.com/feedback)
+
+License
+-------
+
+Copyright 2015 Google, 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.

sensor-graph/app/build.gradle

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+apply plugin: 'com.android.model.application'
+
+model {
+    android {
+        compileSdkVersion = 21
+        buildToolsVersion = "22.0.1"
+
+        defaultConfig.with {
+            applicationId    = "com.android.gl2jni"
+            minSdkVersion.apiLevel    = 8
+            targetSdkVersion.apiLevel = 8
+        }
+    }
+    android.ndk {
+        moduleName = "sensorgraph"
+        cppFlags  += "-Werror"
+        ldLibs    += ["log", "GLESv2", "android"]
+        stl        = "c++_static"
+    }
+
+    android.buildTypes {
+        release {
+            minifyEnabled = false
+            proguardFiles  += file('proguard-rules.txt')
+        }
+    }
+
+    android.productFlavors {
+        create ("arm7") {
+            ndk.abiFilters += "armeabi-v7a"
+        }
+        create ("arm8") {
+            ndk.abiFilters += "arm64-v8a"
+        }
+        create ("x86-32") {
+            ndk.abiFilters += "x86"
+        }
+        // for detailed abiFilter descriptions, refer to "Supported ABIs" @
+        // https://developer.android.com/ndk/guides/abis.html#sa
+
+        // build one including all cpu architectures
+        create("all")
+    }
+}
+

sensor-graph/app/src/main/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<!--
+/*
+**
+** Copyright 2009, 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"
+    package="com.android.sensorgraph">
+    <uses-feature android:glEsVersion="0x00020000" android:required="true"/>
+    <application
+            android:icon="@mipmap/ic_launcher"
+            android:allowBackup="false"
+            android:label="@string/gl2jni_activity">
+        <activity android:name="com.android.sensorgraph.SensorGraphActivity"
+                android:theme="@android:style/Theme.NoTitleBar.Fullscreen"
+            	android:launchMode="singleTask"
+            	android:configChanges="orientation|keyboardHidden">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+</manifest>

sensor-graph/app/src/main/assets/shader.glslf

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+precision mediump float;
+
+uniform vec4 uFragColor;
+
+void main() {
+    gl_FragColor = uFragColor;
+}

sensor-graph/app/src/main/assets/shader.glslv

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+attribute float vPosition;
+attribute float vSensorValue;
+
+void main() {
+    gl_Position = vec4(vPosition, vSensorValue/9.81, 0, 1);
+}

sensor-graph/app/src/main/java/com/android/sensorgraph/SensorGraphActivity.java

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+/*
+ * Copyright (C) 2007 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.android.sensorgraph;
+
+import android.app.Activity;
+import android.opengl.GLSurfaceView;
+import android.os.Bundle;
+
+import javax.microedition.khronos.egl.EGLConfig;
+import javax.microedition.khronos.opengles.GL10;
+
+
+public class SensorGraphActivity extends Activity {
+
+    GLSurfaceView mView;
+
+    @Override protected void onCreate(Bundle icicle) {
+        super.onCreate(icicle);
+        mView = new GLSurfaceView(getApplication());
+        mView.setEGLContextClientVersion(2);
+        mView.setRenderer(new GLSurfaceView.Renderer() {
+            @Override
+            public void onSurfaceCreated(GL10 gl, EGLConfig config) {
+                SensorGraphJNI.surfaceCreated();
+            }
+
+            @Override
+            public void onSurfaceChanged(GL10 gl, int width, int height) {
+                SensorGraphJNI.surfaceChanged(width, height);
+            }
+
+            @Override
+            public void onDrawFrame(GL10 gl) {
+                SensorGraphJNI.drawFrame();
+            }
+        });
+        mView.queueEvent(new Runnable() {
+            @Override
+            public void run() {
+                SensorGraphJNI.init(getAssets());
+            }
+        });
+	    setContentView(mView);
+    }
+
+    @Override protected void onPause() {
+        super.onPause();
+        mView.onPause();
+        mView.queueEvent(new Runnable() {
+            @Override
+            public void run() {
+                SensorGraphJNI.pause();
+            }
+        });
+    }
+
+    @Override protected void onResume() {
+        super.onResume();
+        mView.onResume();
+        mView.queueEvent(new Runnable() {
+            @Override
+            public void run() {
+                SensorGraphJNI.resume();
+            }
+        });
+    }
+}

sensor-graph/app/src/main/java/com/android/sensorgraph/SensorGraphJNI.java

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+/*
+ * Copyright (C) 2007 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.android.sensorgraph;
+
+// Wrapper for native library
+
+import android.content.res.AssetManager;
+
+public class SensorGraphJNI {
+
+     static {
+         System.loadLibrary("sensorgraph");
+     }
+
+     public static native void init(AssetManager assetManager);
+     public static native void surfaceCreated();
+     public static native void surfaceChanged(int width, int height);
+     public static native void drawFrame();
+     public static native void pause();
+     public static native void resume();
+}