Add gradle project for android library

android/gradle/.gitignore

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+.gradle
+**/build/
+!src/**/build/
+
+# Ignore Gradle GUI config
+gradle-app.setting
+
+# Avoid ignoring Gradle wrapper jar file (.jar files are usually ignored)
+!gradle-wrapper.jar
+
+# Avoid ignore Gradle wrappper properties
+!gradle-wrapper.properties
+
+# Cache of project
+.gradletasknamecache
+
+# Eclipse Gradle plugin generated files
+# Eclipse Core
+.project
+# JDT-specific (Eclipse Java Development Tools)
+.classpath

android/gradle/build.gradle

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+buildscript {
+    repositories {
+        google()
+        maven {
+            url "https://plugins.gradle.org/m2/"
+        }
+    }
+    dependencies {
+        classpath "com.android.tools.build:gradle:7.1.3"
+        classpath 'org.mozilla.rust-android-gradle:plugin:0.9.2'
+    }
+}
+
+apply plugin: 'com.android.library'
+apply plugin: 'org.mozilla.rust-android-gradle.rust-android'
+
+android {
+    ndkVersion "23.1.7779620"
+
+    compileSdkVersion 27
+
+    defaultConfig {
+        minSdkVersion 21
+        targetSdkVersion 27
+        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 = "../"
+    targets = ["arm64"]
+    libname = "maplibre"
+
+    features {
+        defaultAnd "foo", "bar"
+        noDefaultBut("foo", "bar")
+        all()
+    }
+
+    def ndkDir = android.ndkDirectory
+
+    exec = { spec, toolchain ->
+        spec.environment("TEST", "test")
+
+        // https://github.com/mozilla/rust-android-gradle/issues/91
+        if (toolchain.target == "aarch64-linux-android") {
+        	spec.environment("AR_aarch64-linux-android", "$ndkDir/toolchains/llvm/prebuilt/linux-x86_64/bin/llvm-ar")
+        }
+    }
+}
+
+repositories {
+    google()
+}
+
+dependencies {
+    androidTestImplementation('com.android.support.test.espresso:espresso-core:2.2.2', {
+        exclude group: 'com.android.support', module: 'support-annotations'
+    })
+    implementation 'com.android.support:appcompat-v7:27.1.1'
+    testImplementation 'junit:junit:4.12'
+}
+
+afterEvaluate {
+    // The `cargoBuild` task isn't available until after evaluation.
+    android.libraryVariants.all { variant ->
+        def productFlavor = ""
+        variant.productFlavors.each {
+            productFlavor += "${it.name.capitalize()}"
+        }
+        def buildType = "${variant.buildType.name.capitalize()}"
+        tasks["generate${productFlavor}${buildType}Assets"].dependsOn(tasks["cargoBuild"])
+    }
+}

android/gradle/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 /Users/nishtahir/Library/Android/sdk/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 *;
+#}
+
+# 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

android/gradle/src/androidTest/java/com/nishtahir/library/ExampleInstrumentedTest.java

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+package org.maplibre-rs;
+
+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.library.test", appContext.getPackageName());
+    }
+}

android/gradle/src/main/AndroidManifest.xml

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+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+
+    package="org.maplibre-rs">
+
+    <application android:allowBackup="true" android:label="@string/app_name"
+        android:supportsRtl="true">
+
+    </application>
+
+</manifest>

android/gradle/src/main/res/values/strings.xml

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+<resources>
+    <string name="app_name">maplibre-rs</string>
+</resources>