updated example to work with RN 0.20

Example/MotionExample/.flowconfig

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+[ignore]
+
+# We fork some components by platform.
+.*/*.web.js
+.*/*.android.js
+
+# Some modules have their own node_modules with overlap
+.*/node_modules/node-haste/.*
+
+# Ugh
+.*/node_modules/babel.*
+.*/node_modules/babylon.*
+.*/node_modules/invariant.*
+
+# Ignore react and fbjs where there are overlaps, but don't ignore
+# anything that react-native relies on
+.*/node_modules/fbjs/lib/Map.js
+.*/node_modules/fbjs/lib/Promise.js
+.*/node_modules/fbjs/lib/fetch.js
+.*/node_modules/fbjs/lib/ExecutionEnvironment.js
+.*/node_modules/fbjs/lib/isEmpty.js
+.*/node_modules/fbjs/lib/crc32.js
+.*/node_modules/fbjs/lib/ErrorUtils.js
+
+# Flow has a built-in definition for the 'react' module which we prefer to use
+# over the currently-untyped source
+.*/node_modules/react/react.js
+.*/node_modules/react/lib/React.js
+.*/node_modules/react/lib/ReactDOM.js
+
+# Ignore commoner tests
+.*/node_modules/commoner/test/.*
+
+# See https://github.com/facebook/flow/issues/442
+.*/react-tools/node_modules/commoner/lib/reader.js
+
+# Ignore jest
+.*/node_modules/jest-cli/.*
+
+# Ignore Website
+.*/website/.*
+
+[include]
+
+[libs]
+node_modules/react-native/Libraries/react-native/react-native-interface.js
+
+[options]
+module.system=haste
+
+munge_underscores=true
+
+module.name_mapper='^image![a-zA-Z0-9$_-]+$' -> 'GlobalImageStub'
+module.name_mapper='^[./a-zA-Z0-9$_-]+\.\(bmp\|gif\|jpg\|jpeg\|png\|psd\|svg\|webp\|m4v\|mov\|mp4\|mpeg\|mpg\|webm\|aac\|aiff\|caf\|m4a\|mp3\|wav\|html\)$' -> 'RelativeImageStub'
+
+suppress_type=$FlowIssue
+suppress_type=$FlowFixMe
+suppress_type=$FixMe
+
+suppress_comment=\\(.\\|\n\\)*\\$FlowFixMe\\($\\|[^(]\\|(\\(>=0\\.\\(2[0-1]\\|1[0-9]\\|[0-9]\\).[0-9]\\)? *\\(site=[a-z,_]*react_native[a-z,_]*\\)?)\\)
+suppress_comment=\\(.\\|\n\\)*\\$FlowIssue\\((\\(>=0\\.\\(2[0-1]\\|1[0-9]\\|[0-9]\\).[0-9]\\)? *\\(site=[a-z,_]*react_native[a-z,_]*\\)?)\\)?:? #[0-9]+
+suppress_comment=\\(.\\|\n\\)*\\$FlowFixedInNextDeploy
+
+[version]
+0.21.0

Example/MotionExample/.gitignore

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+# OSX
+#
+.DS_Store
+
+# Xcode
+#
+build/
+*.pbxuser
+!default.pbxuser
+*.mode1v3
+!default.mode1v3
+*.mode2v3
+!default.mode2v3
+*.perspectivev3
+!default.perspectivev3
+xcuserdata
+*.xccheckout
+*.moved-aside
+DerivedData
+*.hmap
+*.ipa
+*.xcuserstate
+project.xcworkspace
+
+# Android/IJ
+#
+.idea
+.gradle
+local.properties
+
+# node.js
+#
+node_modules/
+npm-debug.log

Example/MotionExample/.watchmanconfig

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+{}

Example/MotionExample/android/app/build.gradle

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+apply plugin: "com.android.application"
+
+import com.android.build.OutputFile
+
+/**
+ * The react.gradle file registers a task for each build variant (e.g. bundleDebugJsAndAssets
+ * and bundleReleaseJsAndAssets).
+ * These basically call `react-native bundle` with the correct arguments during the Android build
+ * cycle. By default, bundleDebugJsAndAssets is skipped, as in debug/dev mode we prefer to load the
+ * bundle directly from the development server. Below you can see all the possible configurations
+ * and their defaults. If you decide to add a configuration block, make sure to add it before the
+ * `apply from: "react.gradle"` line.
+ *
+ * project.ext.react = [
+ *   // the name of the generated asset file containing your JS bundle
+ *   bundleAssetName: "index.android.bundle",
+ *
+ *   // the entry file for bundle generation
+ *   entryFile: "index.android.js",
+ *
+ *   // whether to bundle JS and assets in debug mode
+ *   bundleInDebug: false,
+ *
+ *   // whether to bundle JS and assets in release mode
+ *   bundleInRelease: true,
+ *
+ *   // whether to bundle JS and assets in another build variant (if configured).
+ *   // See http://tools.android.com/tech-docs/new-build-system/user-guide#TOC-Build-Variants
+ *   // The configuration property is in the format 'bundleIn${productFlavor}${buildType}'
+ *   // bundleInFreeDebug: true,
+ *   // bundleInPaidRelease: true,
+ *   // bundleInBeta: true,
+ *
+ *   // the root of your project, i.e. where "package.json" lives
+ *   root: "../../",
+ *
+ *   // where to put the JS bundle asset in debug mode
+ *   jsBundleDirDebug: "$buildDir/intermediates/assets/debug",
+ *
+ *   // where to put the JS bundle asset in release mode
+ *   jsBundleDirRelease: "$buildDir/intermediates/assets/release",
+ *
+ *   // where to put drawable resources / React Native assets, e.g. the ones you use via
+ *   // require('./image.png')), in debug mode
+ *   resourcesDirDebug: "$buildDir/intermediates/res/merged/debug",
+ *
+ *   // where to put drawable resources / React Native assets, e.g. the ones you use via
+ *   // require('./image.png')), in release mode
+ *   resourcesDirRelease: "$buildDir/intermediates/res/merged/release",
+ *
+ *   // by default the gradle tasks are skipped if none of the JS files or assets change; this means
+ *   // that we don't look at files in android/ or ios/ to determine whether the tasks are up to
+ *   // date; if you have any other folders that you want to ignore for performance reasons (gradle
+ *   // indexes the entire tree), add them here. Alternatively, if you have JS files in android/
+ *   // for example, you might want to remove it from here.
+ *   inputExcludes: ["android/**", "ios/**"]
+ * ]
+ */
+
+apply from: "react.gradle"
+
+/**
+ * Set this to true to create three separate APKs instead of one:
+ *   - A universal APK that works on all devices
+ *   - An APK that only works on ARM devices
+ *   - An APK that only works on x86 devices
+ * The advantage is the size of the APK is reduced by about 4MB.
+ * Upload all the APKs to the Play Store and people will download
+ * the correct one based on the CPU architecture of their device.
+ */
+def enableSeparateBuildPerCPUArchitecture = false
+
+/**
+ * Run Proguard to shrink the Java bytecode in release builds.
+ */
+def enableProguardInReleaseBuilds = false
+
+android {
+    compileSdkVersion 23
+    buildToolsVersion "23.0.1"
+
+    defaultConfig {
+        applicationId "com.motionexample"
+        minSdkVersion 16
+        targetSdkVersion 22
+        versionCode 1
+        versionName "1.0"
+        ndk {
+            abiFilters "armeabi-v7a", "x86"
+        }
+    }
+    splits {
+        abi {
+            enable enableSeparateBuildPerCPUArchitecture
+            universalApk false
+            reset()
+            include "armeabi-v7a", "x86"
+        }
+    }
+    buildTypes {
+        release {
+            minifyEnabled enableProguardInReleaseBuilds
+            proguardFiles getDefaultProguardFile("proguard-android.txt"), "proguard-rules.pro"
+        }
+    }
+    // applicationVariants are e.g. debug, release
+    applicationVariants.all { variant ->
+        variant.outputs.each { output ->
+            // For each separate APK per architecture, set a unique version code as described here:
+            // http://tools.android.com/tech-docs/new-build-system/user-guide/apk-splits
+            def versionCodes = ["armeabi-v7a":1, "x86":2]
+            def abi = output.getFilter(OutputFile.ABI)
+            if (abi != null) {  // null for the universal-debug, universal-release variants
+                output.versionCodeOverride =
+                        versionCodes.get(abi) * 1048576 + defaultConfig.versionCode
+            }
+        }
+    }
+}
+
+dependencies {
+    compile fileTree(dir: "libs", include: ["*.jar"])
+    compile "com.android.support:appcompat-v7:23.0.1"
+    compile "com.facebook.react:react-native:0.20.+"
+}

Example/MotionExample/android/app/proguard-rules.pro

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+# Add project specific ProGuard rules here.
+# By default, the flags in this file are appended to flags specified
+# in /usr/local/Cellar/android-sdk/24.3.3/tools/proguard/proguard-android.txt
+# You can edit the include path and order by changing the proguardFiles
+# directive in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# Add any project specific keep options here:
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Disabling obfuscation is useful if you collect stack traces from production crashes
+# (unless you are using a system that supports de-obfuscate the stack traces).
+-dontobfuscate
+
+# React Native
+
+# Keep our interfaces so they can be used by other ProGuard rules.
+# See http://sourceforge.net/p/proguard/bugs/466/
+-keep,allowobfuscation @interface com.facebook.proguard.annotations.DoNotStrip
+-keep,allowobfuscation @interface com.facebook.proguard.annotations.KeepGettersAndSetters
+
+# Do not strip any method/class that is annotated with @DoNotStrip
+-keep @com.facebook.proguard.annotations.DoNotStrip class *
+-keepclassmembers class * {
+    @com.facebook.proguard.annotations.DoNotStrip *;
+}
+
+-keepclassmembers @com.facebook.proguard.annotations.KeepGettersAndSetters class * {
+  void set*(***);
+  *** get*();
+}
+
+-keep class * extends com.facebook.react.bridge.JavaScriptModule { *; }
+-keep class * extends com.facebook.react.bridge.NativeModule { *; }
+-keepclassmembers,includedescriptorclasses class * { native <methods>; }
+-keepclassmembers class *  { @com.facebook.react.uimanager.UIProp <fields>; }
+-keepclassmembers class *  { @com.facebook.react.uimanager.annotations.ReactProp <methods>; }
+-keepclassmembers class *  { @com.facebook.react.uimanager.annotations.ReactPropGroup <methods>; }
+
+-dontwarn com.facebook.react.**
+
+# okhttp
+
+-keepattributes Signature
+-keepattributes *Annotation*
+-keep class com.squareup.okhttp.** { *; }
+-keep interface com.squareup.okhttp.** { *; }
+-dontwarn com.squareup.okhttp.**
+
+# okio
+
+-keep class sun.misc.Unsafe { *; }
+-dontwarn java.nio.file.*
+-dontwarn org.codehaus.mojo.animal_sniffer.IgnoreJRERequirement
+-dontwarn okio.**
+
+# stetho
+
+-dontwarn com.facebook.stetho.**

Example/MotionExample/android/app/react.gradle

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+import org.apache.tools.ant.taskdefs.condition.Os
+
+def config = project.hasProperty("react") ? project.react : [];
+
+def bundleAssetName = config.bundleAssetName ?: "index.android.bundle"
+def entryFile = config.entryFile ?: "index.android.js"
+
+// because elvis operator
+def elvisFile(thing) {
+    return thing ? file(thing) : null;
+}
+
+def reactRoot = elvisFile(config.root) ?: file("../../")
+def inputExcludes = config.inputExcludes ?: ["android/**", "ios/**"]
+
+void runBefore(String dependentTaskName, Task task) {
+    Task dependentTask = tasks.findByPath(dependentTaskName);
+    if (dependentTask != null) {
+        dependentTask.dependsOn task
+    }
+}
+
+gradle.projectsEvaluated {
+    // Grab all build types and product flavors
+    def buildTypes = android.buildTypes.collect { type -> type.name }
+    def productFlavors = android.productFlavors.collect { flavor -> flavor.name }
+
+    // When no product flavors defined, use empty
+    if (!productFlavors) productFlavors.add('')
+
+    productFlavors.each { productFlavorName ->
+        buildTypes.each { buildTypeName ->
+            // Create variant and source names
+            def sourceName = "${buildTypeName}"
+            def targetName = "${sourceName.capitalize()}"
+            if (productFlavorName) {
+                sourceName = "${productFlavorName}${targetName}"
+            }
+
+            // React js bundle directories
+            def jsBundleDirConfigName = "jsBundleDir${targetName}"
+            def jsBundleDir = elvisFile(config."$jsBundleDirConfigName") ?:
+                    file("$buildDir/intermediates/assets/${sourceName}")
+
+            def resourcesDirConfigName = "jsBundleDir${targetName}"
+            def resourcesDir = elvisFile(config."${resourcesDirConfigName}") ?:
+                    file("$buildDir/intermediates/res/merged/${sourceName}")
+            def jsBundleFile = file("$jsBundleDir/$bundleAssetName")
+
+            // Bundle task name for variant
+            def bundleJsAndAssetsTaskName = "bundle${targetName}JsAndAssets"
+
+            def currentBundleTask = tasks.create(
+                    name: bundleJsAndAssetsTaskName,
+                    type: Exec) {
+                group = "react"
+                description = "bundle JS and assets for ${targetName}."
+
+                // Create dirs if they are not there (e.g. the "clean" task just ran)
+                doFirst {
+                    jsBundleDir.mkdirs()
+                    resourcesDir.mkdirs()
+                }
+
+                // Set up inputs and outputs so gradle can cache the result
+                inputs.files fileTree(dir: reactRoot, excludes: inputExcludes)
+                outputs.dir jsBundleDir
+                outputs.dir resourcesDir
+
+                // Set up the call to the react-native cli
+                workingDir reactRoot
+
+                // Set up dev mode
+                def devEnabled = !targetName.toLowerCase().contains("release")
+                if (Os.isFamily(Os.FAMILY_WINDOWS)) {
+                    commandLine "cmd", "/c", "react-native", "bundle", "--platform", "android", "--dev", "${devEnabled}",
+                            "--entry-file", entryFile, "--bundle-output", jsBundleFile, "--assets-dest", resourcesDir
+                } else {
+                    commandLine "react-native", "bundle", "--platform", "android", "--dev", "${devEnabled}",
+                            "--entry-file", entryFile, "--bundle-output", jsBundleFile, "--assets-dest", resourcesDir
+                }
+
+                enabled config."bundleIn${targetName}" ?: targetName.toLowerCase().contains("release")
+            }
+
+            // Hook bundle${productFlavor}${buildType}JsAndAssets into the android build process
+            currentBundleTask.dependsOn("merge${targetName}Resources")
+            currentBundleTask.dependsOn("merge${targetName}Assets")
+
+            runBefore("processArmeabi-v7a${targetName}Resources", currentBundleTask)
+            runBefore("processX86${targetName}Resources", currentBundleTask)
+            runBefore("processUniversal${targetName}Resources", currentBundleTask)
+            runBefore("process${targetName}Resources", currentBundleTask)
+        }
+    }
+}