Android SDK basic sample project and symlinked SDK Mentat binaries (#729) r=nalexander

* Add an IntelliJ section to gitignore
* Add Android SDK sample project which exercises mentat SDK
* Symlink libmentat_ffi.so in Android SDK to the generated --release files
* README files for Android SDK and mentat_ffi

.gitignore

@@ -54,8 +54,10 @@ pom.xml.asc
 /fixtures/*.db-shm
 /fixtures/*.db-wal
 /query-parser/out/
+
 ## Build generated
 /sdks/swift/Mentat/build/
+/sdks/android/**/build
 DerivedData
 build.xcarchive
 
@@ -78,4 +80,10 @@ build.xcarchive
 
 ## Obj-C/Swift specific
 *.hmap
-*.ipa
+*.ipa
+
+
+# Android & IntelliJ
+**/*.iml
+**/.idea
+/sdks/android/**/local.properties

ffi/README.md

@@ -0,0 +1,22 @@
+# Development flow for Mentat FFI
+
+## Android SDK
+Android Mentat SDK is one of two first-party consumers (the other one being iOS Mentat SDK).
+
+Binaries produced by `cargo build ...` are symlinked from within the SDK, and a number of target-specific `libmentat_ffi.so` binaries are bundled together and distributed with the SDK.
+
+There is a build script at `<mentat_root>/scripts/android_build.sh` which knows how to cross-compile `mentat_ffi` for various Android targets.
+
+- `./<mentat_root>/scripts/android_build.sh` - compiles for all supported targets
+- `./<mentat_root>/scripts/android_build.sh x86` - compiles for `x86`
+- `./<mentat_root>/scripts/android_build.sh x86 arm` - compiles for `x86`, `arm` 
+
+General development flow while working on the Android SDK is:
+- (pre) compile for all targets, if you've never done so
+- make changes to `mentat_ffi` and/or `mentat`
+- re-compile `mentat_ffi` binaries using `./android_build.sh x86`. During development it's faster to compile just for the target which matches your emulator, e.g. `x86`
+- make corresponding changes in the Android SDK, try them out from within the bundled sample project
+- since binaries are symlinked, no manual copy step is necessary for the Android SDK to pick up the changes
+
+## iOS SDK
+TODO, contribute via [issue #732](https://github.com/mozilla/mentat/issues/732).

sdks/android/Mentat/build.gradle

@@ -7,6 +7,12 @@ buildscript {
             version: '0.3.1'
     ]
 
+    ext.build = [
+            compileSdkVersion: 27,
+            targetSdkVersion: 27,
+            minSdkVersion: 16
+    ]
+
     repositories {
         jcenter()
         google()

sdks/android/Mentat/gradle/wrapper/gradle-wrapper.properties

@@ -1,4 +1,4 @@
-#Mon May 28 21:36:15 EDT 2018
+#Thu May 31 19:25:23 EDT 2018
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME

sdks/android/Mentat/library/build.gradle

@@ -5,12 +5,11 @@ apply plugin: 'com.jfrog.bintray'
 apply plugin: 'com.github.dcendents.android-maven'
 
 android {
-    compileSdkVersion 27
+    compileSdkVersion rootProject.ext.build['compileSdkVersion']
     defaultConfig {
-        minSdkVersion 16
+        minSdkVersion rootProject.ext.build['minSdkVersion']
-        targetSdkVersion 27
+        targetSdkVersion rootProject.ext.build['targetSdkVersion']
-        versionCode 1
+
-        versionName "1.0"
         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
     }
     buildTypes {

sdks/android/Mentat/library/src/main/jniLibs/arm64/libmentat_ffi.so

@@ -0,0 +1 @@
+../../../../../../../../target/aarch64-linux-android/release/libmentat_ffi.so

sdks/android/Mentat/library/src/main/jniLibs/armeabi/libmentat_ffi.so

@@ -0,0 +1 @@
+../../../../../../../../target/armv7-linux-androideabi/release/libmentat_ffi.so

sdks/android/Mentat/library/src/main/jniLibs/x86/libmentat_ffi.so

@@ -0,0 +1 @@
+../../../../../../../../target/i686-linux-android/release/libmentat_ffi.so

sdks/android/Mentat/samples/basic/build.gradle

@@ -0,0 +1,38 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+apply plugin: 'com.android.application'
+apply plugin: 'kotlin-android'
+apply plugin: 'kotlin-android-extensions'
+
+android {
+    compileSdkVersion rootProject.ext.build['compileSdkVersion']
+
+    defaultConfig {
+        applicationId "org.mozilla.samples.mentat.basic"
+        minSdkVersion rootProject.ext.build['minSdkVersion']
+        targetSdkVersion rootProject.ext.build['targetSdkVersion']
+        versionCode 1
+        versionName "1.0"
+
+        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
+    }
+
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
+        }
+    }
+}
+
+dependencies {
+    implementation project(':library')
+    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
+    implementation "com.android.support:appcompat-v7:27.1.1"
+}
+
+repositories {
+    mavenCentral()
+}

sdks/android/Mentat/samples/basic/proguard-rules.pro

@@ -0,0 +1,21 @@
+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# 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 *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile

sdks/android/Mentat/samples/basic/src/main/AndroidManifest.xml

@@ -0,0 +1,29 @@
+<?xml version="1.0" encoding="utf-8"?>
+    <!-- Copyright 2018 Mozilla
+    * 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="org.mozilla.samples.basic">
+
+    <application
+        android:allowBackup="true"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:supportsRtl="true"
+        android:theme="@style/Theme.AppCompat.Light.NoActionBar">
+        <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>

sdks/android/Mentat/samples/basic/src/main/java/org/mozilla/samples/basic/MainActivity.kt

@@ -0,0 +1,28 @@
+/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
+ * Copyright 2018 Mozilla
+ * 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 org.mozilla.samples.basic
+
+import android.support.v7.app.AppCompatActivity
+import android.os.Bundle
+
+import org.mozilla.mentat.Mentat
+
+class MainActivity : AppCompatActivity() {
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_main)
+
+        Mentat(this.getDatabasePath("test.db").absolutePath).use {
+        }
+    }
+}
+

sdks/android/Mentat/samples/basic/src/main/res/drawable-v24/ic_launcher_foreground.xml

@@ -0,0 +1,34 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:aapt="http://schemas.android.com/aapt"
+    android:width="108dp"
+    android:height="108dp"
+    android:viewportHeight="108"
+    android:viewportWidth="108">
+    <path
+        android:fillType="evenOdd"
+        android:pathData="M32,64C32,64 38.39,52.99 44.13,50.95C51.37,48.37 70.14,49.57 70.14,49.57L108.26,87.69L108,109.01L75.97,107.97L32,64Z"
+        android:strokeColor="#00000000"
+        android:strokeWidth="1">
+        <aapt:attr name="android:fillColor">
+            <gradient
+                android:endX="78.5885"
+                android:endY="90.9159"
+                android:startX="48.7653"
+                android:startY="61.0927"
+                android:type="linear">
+                <item
+                    android:color="#44000000"
+                    android:offset="0.0" />
+                <item
+                    android:color="#00000000"
+                    android:offset="1.0" />
+            </gradient>
+        </aapt:attr>
+    </path>
+    <path
+        android:fillColor="#FFFFFF"
+        android:fillType="nonZero"
+        android:pathData="M66.94,46.02L66.94,46.02C72.44,50.07 76,56.61 76,64L32,64C32,56.61 35.56,50.11 40.98,46.06L36.18,41.19C35.45,40.45 35.45,39.3 36.18,38.56C36.91,37.81 38.05,37.81 38.78,38.56L44.25,44.05C47.18,42.57 50.48,41.71 54,41.71C57.48,41.71 60.78,42.57 63.68,44.05L69.11,38.56C69.84,37.81 70.98,37.81 71.71,38.56C72.44,39.3 72.44,40.45 71.71,41.19L66.94,46.02ZM62.94,56.92C64.08,56.92 65,56.01 65,54.88C65,53.76 64.08,52.85 62.94,52.85C61.8,52.85 60.88,53.76 60.88,54.88C60.88,56.01 61.8,56.92 62.94,56.92ZM45.06,56.92C46.2,56.92 47.13,56.01 47.13,54.88C47.13,53.76 46.2,52.85 45.06,52.85C43.92,52.85 43,53.76 43,54.88C43,56.01 43.92,56.92 45.06,56.92Z"
+        android:strokeColor="#00000000"
+        android:strokeWidth="1" />
+</vector>

sdks/android/Mentat/samples/basic/src/main/res/drawable/ic_launcher_background.xml

@@ -0,0 +1,170 @@
+<?xml version="1.0" encoding="utf-8"?>
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="108dp"
+    android:height="108dp"
+    android:viewportHeight="108"
+    android:viewportWidth="108">
+    <path
+        android:fillColor="#26A69A"
+        android:pathData="M0,0h108v108h-108z" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M9,0L9,108"
+        android:strokeColor="#33FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,0L19,108"
+        android:strokeColor="#33FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M29,0L29,108"
+        android:strokeColor="#33FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M39,0L39,108"
+        android:strokeColor="#33FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M49,0L49,108"
+        android:strokeColor="#33FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M59,0L59,108"
+        android:strokeColor="#33FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M69,0L69,108"
+        android:strokeColor="#33FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M79,0L79,108"
+        android:strokeColor="#33FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M89,0L89,108"
+        android:strokeColor="#33FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M99,0L99,108"
+        android:strokeColor="#33FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,9L108,9"
+        android:strokeColor="#33FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,19L108,19"
+        android:strokeColor="#33FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,29L108,29"
+        android:strokeColor="#33FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,39L108,39"
+        android:strokeColor="#33FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,49L108,49"
+        android:strokeColor="#33FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,59L108,59"
+        android:strokeColor="#33FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,69L108,69"
+        android:strokeColor="#33FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,79L108,79"
+        android:strokeColor="#33FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,89L108,89"
+        android:strokeColor="#33FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,99L108,99"
+        android:strokeColor="#33FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,29L89,29"
+        android:strokeColor="#33FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,39L89,39"
+        android:strokeColor="#33FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,49L89,49"
+        android:strokeColor="#33FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,59L89,59"
+        android:strokeColor="#33FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,69L89,69"
+        android:strokeColor="#33FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,79L89,79"
+        android:strokeColor="#33FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M29,19L29,89"
+        android:strokeColor="#33FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M39,19L39,89"
+        android:strokeColor="#33FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M49,19L49,89"
+        android:strokeColor="#33FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M59,19L59,89"
+        android:strokeColor="#33FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M69,19L69,89"
+        android:strokeColor="#33FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M79,19L79,89"
+        android:strokeColor="#33FFFFFF"
+        android:strokeWidth="0.8" />
+</vector>

sdks/android/Mentat/samples/basic/src/main/res/layout/activity_main.xml

@@ -0,0 +1,18 @@
+<?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=".MainActivity">
+
+    <TextView
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="Mentat SDK Sample"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintLeft_toLeftOf="parent"
+        app:layout_constraintRight_toRightOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
+
+</android.support.constraint.ConstraintLayout>

sdks/android/Mentat/samples/basic/src/main/res/mipmap-anydpi-v26/ic_launcher.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@drawable/ic_launcher_background" />
+    <foreground android:drawable="@drawable/ic_launcher_foreground" />
+</adaptive-icon>

sdks/android/Mentat/samples/basic/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@drawable/ic_launcher_background" />
+    <foreground android:drawable="@drawable/ic_launcher_foreground" />
+</adaptive-icon>

sdks/android/Mentat/samples/basic/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>

sdks/android/Mentat/samples/basic/src/main/res/values/strings.xml

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

sdks/android/Mentat/samples/basic/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>

sdks/android/Mentat/settings.gradle

@@ -1 +1,5 @@
 include ':library'
+
+// SDK sample
+include ':samples-basic'
+project(':samples-basic').projectDir = new File(rootDir, 'samples/basic')

sdks/android/README.md

@@ -0,0 +1,8 @@
+# Android Mentat SDK
+
+Exposes Mentat functionality to Android applications via the foreign function interface provided by `mentat_ffi`.
+
+Note that `libmentat_ffi.so` binaries are symlinked. Use [the cross-compilation script](https://github.com/mozilla/mentat/tree/master/scripts/android_build.sh) to build them. Windows users: apologies if you're on FAT; symlinks are supported on NTFS (on Vista and later).
+
+- See [sample projects](https://github.com/mozilla/mentat/tree/master/sdks/android/Mentat/samples) for how one might use the SDK.
+- See [documentation](https://github.com/mozilla/mentat/tree/master/ffi/README.md) within the `mentat_ffi` crate for development flow.