Init commit

.gitignore

@@ -0,0 +1,41 @@
+*.apk
+*.ap_
+*.dex
+*.class
+bin/
+gen/
+out/
+.gradle/
+build/
+local.properties
+proguard/
+*.log
+.navigation/
+captures/
+*.iml
+.idea/
+.externalNativeBuild
+cmake-build-debug/
+*.iws
+/out/
+.idea_modules/
+atlassian-ide-plugin.xml
+.idea/replstate.xml
+com_crashlytics_export_strings.xml
+crashlytics.properties
+crashlytics-build.properties
+fabric.properties
+modules.xml
+.idea/misc.xml
+*.ipr
+/target/
+Cargo.lock
+**/*.rs.bk
+.gradle
+**/build/
+gradle-app.setting
+!gradle-wrapper.jar
+.gradletasknamecache
+
+.cargo
+**/maven-repo/

build.gradle

@@ -0,0 +1,23 @@
+buildscript {
+    ext.kotlin_version = '1.1.4-3'
+
+    repositories {
+        mavenCentral()
+        maven {
+            url "https://plugins.gradle.org/m2/"
+        }
+    }
+    dependencies {
+        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
+    }
+}
+
+subprojects {
+    repositories {
+        mavenCentral()
+        google()
+        maven {
+            url "https://plugins.gradle.org/m2/"
+        }
+    }
+}

gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,6 @@
+#Tue Sep 12 21:04:48 EDT 2017
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.1-all.zip

gradlew

@@ -0,0 +1,172 @@
+#!/usr/bin/env sh
+
+##############################################################################
+##
+##  Gradle start up script for UN*X
+##
+##############################################################################
+
+# 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
+
+APP_NAME="Gradle"
+APP_BASE_NAME=`basename "$0"`
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS=""
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD="maximum"
+
+warn () {
+    echo "$*"
+}
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+}
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "`uname`" in
+  CYGWIN* )
+    cygwin=true
+    ;;
+  Darwin* )
+    darwin=true
+    ;;
+  MINGW* )
+    msys=true
+    ;;
+  NONSTOP* )
+    nonstop=true
+    ;;
+esac
+
+CLASSPATH=$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 "$darwin" = "false" -a "$nonstop" = "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
+
+# Escape application args
+save () {
+    for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
+    echo " "
+}
+APP_ARGS=$(save "$@")
+
+# Collect all arguments for the java command, following the shell quoting and substitution rules
+eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
+
+# by default we should be in the correct project dir, but when run from Finder on Mac, the cwd is wrong
+if [ "$(uname)" = "Darwin" ] && [ "$HOME" = "$PWD" ]; then
+  cd "$(dirname "$0")"
+fi
+
+exec "$JAVACMD" "$@"

gradlew.bat

@@ -0,0 +1,84 @@
+@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
+
+set DIRNAME=%~dp0
+if "%DIRNAME%" == "" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@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=
+
+@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 Windows variants
+
+if not "%OS%" == "Windows_NT" goto win9xME_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=%*
+
+: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

plugin/build.gradle

@@ -0,0 +1,49 @@
+apply plugin: "java-gradle-plugin"
+apply plugin: "maven-publish"
+apply plugin: "kotlin"
+
+gradlePlugin {
+    plugins {
+        simplePlugin {
+            id = "com.nishtahir.rust-android"
+            implementationClass = "com.nishtahir.RustAndroidPlugin"
+        }
+    }
+}
+
+group 'com.nishtahir'
+version '0.0.1'
+
+publishing {
+    repositories {
+        maven {
+            url "../sample/maven-repo"
+        }
+    }
+    publications {
+        maven(MavenPublication) {
+            groupId 'com.nishtahir'
+            artifactId 'rust-android'
+            version '0.0.1'
+
+            from components.java
+        }
+    }
+}
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    compileOnly gradleApi()
+    implementation "com.android.tools.build:gradle:2.3.3"
+    implementation "org.jetbrains.kotlin:kotlin-stdlib-jre8:$kotlin_version"
+}
+
+compileKotlin {
+    kotlinOptions.jvmTarget = "1.8"
+}
+compileTestKotlin {
+    kotlinOptions.jvmTarget = "1.8"
+}

plugin/src/main/kotlin/com/nishtahir/CargoBuildTask.kt

@@ -0,0 +1,42 @@
+package com.nishtahir;
+
+import org.gradle.api.DefaultTask
+import org.gradle.api.Project
+import org.gradle.api.tasks.TaskAction
+import java.io.File
+
+open class CargoBuildTask : DefaultTask() {
+
+    @Suppress("unused")
+    @TaskAction
+    fun build() = with(project) {
+        extensions[CargoExtension::class].apply {
+            targets.forEach { target ->
+                val toolchain = toolchains.find { (arch) -> arch == target }
+                if (toolchain != null) {
+                    buildProjectForTarget(project, toolchain, this)
+
+                    copy { spec ->
+                        spec.from(File(project.projectDir, "$module/target/${toolchain.target}/debug"))
+                        spec.into(File(buildDir, "jniLibs/${toolchain.folder}"))
+                        spec.include("*.so")
+                    }
+                } else {
+                    println("No such target $target")
+                }
+            }
+        }
+    }
+
+    private fun buildProjectForTarget(project: Project, toolchain: Toolchain, cargoExtension: CargoExtension) {
+        project.exec { spec ->
+            val CCompiler = "${project.getToolchainDirectory()}/${toolchain.bin()}"
+            println("using compiler: $CCompiler")
+            spec.standardOutput = System.out
+            spec.workingDir = File(project.project.projectDir, cargoExtension.module)
+            spec.environment("CC", CCompiler)
+            spec.environment("RUSTFLAGS", "-C linker=$CCompiler")
+            spec.commandLine = listOf("cargo", "build", "--target=${toolchain.target}")
+        }.assertNormalExitValue()
+    }
+}

plugin/src/main/kotlin/com/nishtahir/CargoExtension.kt

@@ -0,0 +1,6 @@
+package com.nishtahir
+
+open class CargoExtension {
+    var module: String = ""
+    var targets: List<String> = emptyList()
+}

plugin/src/main/kotlin/com/nishtahir/Extensions.kt

@@ -0,0 +1,17 @@
+package com.nishtahir
+
+import org.gradle.api.Project
+import org.gradle.api.plugins.ExtensionContainer
+import java.io.File
+import kotlin.reflect.KClass
+
+val TOOLS_FOLDER = ".cargo/toolchain"
+val TARGET_FOLDER = "build/"
+
+operator fun <T : Any> ExtensionContainer.get(type: KClass<T>): T {
+    return getByType(type.java)!!
+}
+
+fun Project.getToolchainDirectory(): File {
+    return File(projectDir, TOOLS_FOLDER)
+}

plugin/src/main/kotlin/com/nishtahir/RustAndroidPlugin.kt

@@ -0,0 +1,65 @@
+package com.nishtahir
+
+import com.android.build.gradle.AppExtension
+import com.android.build.gradle.AppPlugin
+import org.gradle.api.Plugin
+import org.gradle.api.Project
+import java.io.File
+
+val toolchains = listOf<Toolchain>(
+        Toolchain("arm",
+                "arm-linux-androideabi",
+                "bin/arm-linux-androideabi-clang",
+                "armeabi"),
+        Toolchain("mips",
+                "mipsel-linux-android",
+                "bin/mipsel-linux-android-clang",
+                "mips"),
+        Toolchain("x86",
+                "i686-linux-android",
+                "bin/i686-linux-android-clang",
+                "x86")
+)
+
+data class Toolchain(val platform: String,
+                     val target: String,
+                     val compiler: String,
+                     val folder: String) {
+    fun bin(): String = "$platform/$compiler"
+}
+
+open class RustAndroidPlugin : Plugin<Project> {
+
+    override fun apply(project: Project) = with(project) {
+        extensions.add("cargo", CargoExtension::class.java)
+
+        afterEvaluate {
+            plugins.all {
+                when (it) {
+                    is AppPlugin -> {
+                        val app = extensions[AppExtension::class]
+                        val minSdk = app.defaultConfig.minSdkVersion.apiLevel
+                        val ndk = app.ndkDirectory
+                        println("Checking for existing toolchain in ${getToolchainDirectory().absolutePath}")
+                        if (!getToolchainDirectory().exists()) {
+                            println("Preparing standalone toolchains...")
+                            toolchains.filterNot { (arch) -> minSdk < 21 && arch.endsWith("64") }
+                                    .forEach { (arch) ->
+                                        exec { spec ->
+                                            spec.standardOutput = System.out
+                                            spec.commandLine = listOf("$ndk/build/tools/make_standalone_toolchain.py")
+                                            spec.args = listOf("--arch=$arch", "--api=$minSdk", "--install-dir=${getToolchainDirectory()}/$arch")
+                                        }
+                                    }
+                        } else {
+                            println("Existing toolchains found. Clean to regenerate")
+                        }
+                        app.sourceSets.getByName("main").jniLibs.srcDir(File("$buildDir/jniLibs/"))
+                        tasks.create("cargoBuild", CargoBuildTask::class.java)
+                    }
+                }
+            }
+        }
+    }
+}
+

rust/.gitignore

@@ -0,0 +1,3 @@
+/target/
+**/*.rs.bk
+Cargo.lock

rust/Cargo.toml

@@ -0,0 +1,10 @@
+[package]
+name = "rust"
+version = "0.1.0"
+authors = ["Nish Tahir <nish.tahir@willowtreeapps.com>"]
+
+[dependencies]
+jni = "0.5.2"
+
+[lib]
+crate_type = ["staticlib", "dylib"]

rust/src/lib.rs

@@ -0,0 +1,42 @@
+extern crate jni;
+
+// This is the interface to the JVM that we'll call the majority of our
+// methods on.
+use jni::JNIEnv;
+
+// These objects are what you should use as arguments to your native
+// function. They carry extra lifetime information to prevent them escaping
+// this context and getting used after being GC'd.
+use jni::objects::{JClass, JString};
+
+// This is just a pointer. We'll be returning it from our function. We
+// can't return one of the objects with lifetime information because the
+// lifetime checker won't let us.
+use jni::sys::jstring;
+
+// This keeps rust from "mangling" the name and making it unique for this
+// crate.
+#[no_mangle]
+// This turns off linter warnings because the name doesn't conform to
+// conventions.
+#[allow(non_snake_case)]
+pub extern "C" fn Java_com_nishtahir_androidrust_MainActivity_stringFromJNI(env: JNIEnv,
+                                             // this is the class that owns our
+                                             // static method. Not going to be
+                                             // used, but still needs to have an
+                                             // argument slot
+                                             _: JClass)
+                                             -> jstring {
+    // First, we have to get the string out of java. Check out the `strings`
+    // module for more info on how this works.
+    //let input: String =
+    //   env.get_string(input).expect("Couldn't get java string!").into();
+
+    // Then we have to create a new java string to return. Again, more info
+    // in the `strings` module.
+    let output = env.new_string("Hello, Rust!")
+        .expect("Couldn't create java string!");
+
+    // Finally, extract the raw pointer to return.
+    return output.into_inner();
+}

sample/build.gradle

@@ -0,0 +1,59 @@
+buildscript {
+    repositories {
+        mavenCentral()
+        maven {
+            url "https://plugins.gradle.org/m2/"
+        }
+        maven {
+            url "./maven-repo"
+        }
+    }
+    dependencies {
+        classpath "com.nishtahir:rust-android:0.0.1"
+    }
+}
+
+apply plugin: 'com.android.application'
+apply plugin: "com.nishtahir.rust-android"
+
+android {
+    compileSdkVersion 26
+    buildToolsVersion "26.0.1"
+    defaultConfig {
+        applicationId "com.nishtahir.androidrust"
+        minSdkVersion 19
+        targetSdkVersion 26
+        versionCode 1
+        versionName "1.0"
+        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
+    }
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
+        }
+    }
+}
+
+cargo {
+    module = "../rust"
+    targets = ["arm"]
+}
+
+repositories {
+    mavenCentral()
+    maven {
+        url "./maven-repo"
+    }
+}
+
+dependencies {
+    compile fileTree(dir: 'libs', include: ['*.jar'])
+    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
+        exclude group: 'com.android.support', module: 'support-annotations'
+    })
+    compile 'com.android.support:appcompat-v7:26.+'
+    compile 'com.android.support.constraint:constraint-layout:1.0.2'
+    testCompile 'junit:junit:4.12'
+}
+

sample/src/androidTest/java/com/nishtahir/androidrust/ExampleInstrumentedTest.java

@@ -0,0 +1,26 @@
+package com.nishtahir.androidrust;
+
+import android.content.Context;
+import android.support.test.InstrumentationRegistry;
+import android.support.test.runner.AndroidJUnit4;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import static org.junit.Assert.*;
+
+/**
+ * Instrumentation test, which will execute on an Android device.
+ *
+ * @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
+ */
+@RunWith(AndroidJUnit4.class)
+public class ExampleInstrumentedTest {
+    @Test
+    public void useAppContext() throws Exception {
+        // Context of the app under test.
+        Context appContext = InstrumentationRegistry.getTargetContext();
+
+        assertEquals("com.nishtahir.androidrust", appContext.getPackageName());
+    }
+}

sample/src/main/AndroidManifest.xml

@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.nishtahir.androidrust">
+
+    <application
+        android:allowBackup="true"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:roundIcon="@mipmap/ic_launcher_round"
+        android:supportsRtl="true"
+        android:theme="@style/AppTheme">
+        <activity android:name=".MainActivity">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+
+</manifest>

sample/src/main/java/com/nishtahir/androidrust/MainActivity.java

@@ -0,0 +1,30 @@
+package com.nishtahir.androidrust;
+
+import android.os.Bundle;
+import android.support.v7.app.AppCompatActivity;
+import android.widget.TextView;
+
+public class MainActivity extends AppCompatActivity {
+
+    // Used to load the 'lib' library on application startup.
+    static {
+        System.loadLibrary("lib");
+    }
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_main);
+
+        // Example of a call to a native method
+        TextView tv = (TextView) findViewById(R.id.sample_text);
+        tv.setText(stringFromJNI());
+
+    }
+
+    /**
+     * A native method that is implemented by the 'lib' native library,
+     * which is packaged with this application.
+     */
+    public native String stringFromJNI();
+}

sample/src/main/res/layout/activity_main.xml

@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="utf-8"?>
+<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    tools:context="com.nishtahir.androidrust.MainActivity">
+
+    <TextView
+        android:id="@+id/sample_text"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="Hello World!"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintLeft_toLeftOf="parent"
+        app:layout_constraintRight_toRightOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
+
+</android.support.constraint.ConstraintLayout>

sample/src/main/res/values/colors.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <color name="colorPrimary">#3F51B5</color>
+    <color name="colorPrimaryDark">#303F9F</color>
+    <color name="colorAccent">#FF4081</color>
+</resources>

sample/src/main/res/values/strings.xml

@@ -0,0 +1,3 @@
+<resources>
+    <string name="app_name">AndroidRust</string>
+</resources>

sample/src/main/res/values/styles.xml

@@ -0,0 +1,11 @@
+<resources>
+
+    <!-- Base application theme. -->
+    <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
+        <!-- Customize your theme here. -->
+        <item name="colorPrimary">@color/colorPrimary</item>
+        <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
+        <item name="colorAccent">@color/colorAccent</item>
+    </style>
+
+</resources>

sample/src/test/java/com/nishtahir/androidrust/ExampleUnitTest.java

@@ -0,0 +1,17 @@
+package com.nishtahir.androidrust;
+
+import org.junit.Test;
+
+import static org.junit.Assert.*;
+
+/**
+ * Example local unit test, which will execute on the development machine (host).
+ *
+ * @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
+ */
+public class ExampleUnitTest {
+    @Test
+    public void addition_isCorrect() throws Exception {
+        assertEquals(4, 2 + 2);
+    }
+}

settings.gradle

@@ -0,0 +1,4 @@
+rootProject.name = 'rust-android'
+include 'plugin'
+include 'sample'
+