android: add build files

src/android/app/CMakeLists.txt

@@ -0,0 +1,6 @@
+cmake_minimum_required(VERSION 3.6.0)
+
+# TODO: actually add files to compile
+
+# find Android's log library
+find_library(log-lib log)

src/android/app/build.gradle

@@ -0,0 +1,136 @@
+apply plugin: 'com.android.application'
+
+android {
+    compileSdkVersion 26
+    buildToolsVersion '28.0.3'
+
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
+
+    lintOptions {
+        // This is important as it will run lint but not abort on error
+        // Lint has some overly obnoxious "errors" that should really be warnings
+        abortOnError false
+    }
+
+    defaultConfig {
+        applicationId "org.citra_emu"
+        minSdkVersion 21
+        targetSdkVersion 26
+
+        versionCode(getBuildVersionCode())
+
+        versionName "${getVersion()}"
+    }
+
+    signingConfigs {
+        release {
+            if (project.hasProperty('keystore')) {
+                storeFile file(project.property('keystore'))
+                storePassword project.property('storepass')
+                keyAlias project.property('keyalias')
+                keyPassword project.property('keypass')
+            }
+        }
+    }
+
+    // Define build types, which are orthogonal to product flavors.
+    buildTypes {
+        // Signed by release key, allowing for upload to Play Store.
+        release {
+            signingConfig signingConfigs.release
+        }
+
+        // Signed by debug key disallowing distribution on Play Store.
+        // Attaches 'debug' suffix to version and package name, allowing installation alongside the release build.
+        debug {
+            // TODO If this is ever modified, change application_id in debug/strings.xml
+            applicationIdSuffix ".debug"
+            versionNameSuffix '-debug'
+            jniDebuggable true
+        }
+    }
+
+    externalNativeBuild {
+        cmake {
+            version getCmakeVersion()
+            path "CMakeLists.txt"
+        }
+    }
+
+    defaultConfig {
+        externalNativeBuild {
+            cmake {
+                cppFlags "-std=c++17"
+                arguments "-DENABLE_QT=0", // Don't use QT
+                        "-DENABLE_SDL2=0", // Don't use SDL
+                        "-DANDROID_ARM_NEON=true", // cryptopp requires Neon to work
+                        "-DENABLE_CUBEB=0"
+                        "-DANDROID_STL=c++_shared"
+
+                abiFilters "arm64-v8a", "x86_64"
+            }
+        }
+    }
+}
+
+ext {
+    androidSupportVersion = '26.1.0'
+}
+
+dependencies {
+    implementation "com.android.support:support-v13:$androidSupportVersion"
+    implementation "com.android.support:cardview-v7:$androidSupportVersion"
+    implementation "com.android.support:recyclerview-v7:$androidSupportVersion"
+    implementation "com.android.support:design:$androidSupportVersion"
+
+    // Android TV UI libraries.
+    implementation "com.android.support:leanback-v17:$androidSupportVersion"
+
+    implementation 'com.android.support.constraint:constraint-layout:1.1.0'
+}
+
+def getVersion() {
+    def versionNumber = '0.0'
+
+    try {
+        versionNumber = 'git describe --always --long'.execute([], project.rootDir).text
+                .trim()
+                .replaceAll(/(-0)?-[^-]+$/, "")
+    } catch (Exception e) {
+        logger.error('Cannot find git, defaulting to dummy version number')
+    }
+
+    return versionNumber
+}
+
+
+def getBuildVersionCode() {
+    try {
+        def versionNumber = 'git rev-list --first-parent --count HEAD'.execute([], project.rootDir).text
+                .trim()
+        return Integer.valueOf(versionNumber)
+    } catch (Exception e) {
+        logger.error('Cannot find git, defaulting to dummy version number')
+    }
+
+    return 0
+}
+
+def getCmakeVersion() {
+    try {
+        // Tokenized form of the output will be - ["cmake", "version", "M.m.p-rcx"], the version number
+        // will be at index 2
+        def version_string = 'cmake -version'.execute([], project.rootDir).text
+                .trim().tokenize()[2]
+
+        return version_string
+    }
+    catch(Exception e) {
+        logger.error('Cannot find Cmake, using default Cmake')
+    }
+
+    return null
+}

src/android/app/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

src/android/app/src/androidTest/java/org/citra_emu/citra/ExampleInstrumentedTest.java

@@ -0,0 +1,26 @@
+package org.citra_emu.citra;
+
+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.*;
+
+/**
+ * Instrumented 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() {
+        // Context of the app under test.
+        Context appContext = InstrumentationRegistry.getTargetContext();
+
+        assertEquals("org.citra_emu.citra_android", appContext.getPackageName());
+    }
+}

src/android/app/src/test/java/org/citra_emu/citra/ExampleUnitTest.java

@@ -0,0 +1,17 @@
+package org.citra_emu.citra;
+
+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() {
+        assertEquals(4, 2 + 2);
+    }
+}