android: Add Citra frontend.

src/android/app/build.gradle

@@ -0,0 +1,163 @@
+apply plugin: 'com.android.application'
+
+/**
+ * Use the number of seconds/10 since Jan 1 2016 as the versionCode.
+ * This lets us upload a new build at most every 10 seconds for the
+ * next 680 years.
+ */
+def autoVersion = (int) (((new Date().getTime() / 1000) - 1451606400) / 10)
+def buildType
+def abiFilter = "arm64-v8a" //, "x86"
+
+android {
+    compileSdkVersion 32
+    ndkVersion "25.1.8937393"
+
+    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
+
+        //Uncomment disable lines for test builds...
+        //disable 'MissingTranslation'bin
+        //disable 'ExtraTranslation'
+    }
+
+    defaultConfig {
+        // TODO If this is ever modified, change application_id in strings.xml
+        applicationId "org.citra.citra_emu"
+        minSdkVersion 28
+        targetSdkVersion 29
+        versionCode autoVersion
+        versionName getVersion()
+        ndk.abiFilters abiFilter
+    }
+
+    signingConfigs {
+        //release {
+        //    storeFile file('')
+        //    storePassword System.getenv('ANDROID_KEYPASS')
+        //    keyAlias = 'key0'
+        //    keyPassword System.getenv('ANDROID_KEYPASS')
+        //}
+    }
+
+    applicationVariants.all { variant ->
+        buildType = variant.buildType.name // sets the current build type
+    }
+
+    // Define build types, which are orthogonal to product flavors.
+    buildTypes {
+
+        // Signed by release key, allowing for upload to Play Store.
+        release {
+            signingConfig signingConfigs.debug
+        }
+
+        // builds a release build that doesn't need signing
+        // Attaches 'debug' suffix to version and package name, allowing installation alongside the release build.
+        relWithDebInfo {
+            initWith release
+            applicationIdSuffix ".debug"
+            versionNameSuffix '-debug'
+            signingConfig signingConfigs.debug
+            minifyEnabled false
+            testCoverageEnabled false
+            debuggable true
+            jniDebuggable true
+        }
+
+        // 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'
+            debuggable true
+            jniDebuggable true
+        }
+    }
+
+    flavorDimensions "version"
+    productFlavors {
+        canary {
+            dimension "version"
+            applicationIdSuffix ".canary"
+        }
+        nightly {
+            dimension "version"
+        }
+    }
+
+    externalNativeBuild {
+        cmake {
+            version "3.22.1"
+            path "../../../CMakeLists.txt"
+        }
+    }
+
+    defaultConfig {
+        externalNativeBuild {
+            cmake {
+                arguments "-DENABLE_QT=0", // Don't use QT
+                        "-DENABLE_SDL2=0", // Don't use SDL
+                        "-DENABLE_WEB_SERVICE=0", // Don't use telemetry
+                        "-DANDROID_ARM_NEON=true", // cryptopp requires Neon to work
+                        "-DYUZU_USE_BUNDLED_VCPKG=ON",
+                        "-DYUZU_USE_BUNDLED_FFMPEG=ON"
+
+                abiFilters abiFilter
+            }
+        }
+    }
+}
+
+dependencies {
+    implementation 'androidx.appcompat:appcompat:1.5.1'
+    implementation 'androidx.exifinterface:exifinterface:1.3.4'
+    implementation 'androidx.cardview:cardview:1.0.0'
+    implementation 'androidx.recyclerview:recyclerview:1.2.1'
+    implementation 'androidx.constraintlayout:constraintlayout:2.1.4'
+    implementation 'androidx.lifecycle:lifecycle-viewmodel:2.5.1'
+    implementation 'androidx.fragment:fragment:1.5.3'
+    implementation "androidx.slidingpanelayout:slidingpanelayout:1.2.0"
+    implementation 'com.google.android.material:material:1.6.1'
+
+    // For loading huge screenshots from the disk.
+    implementation 'com.squareup.picasso:picasso:2.71828'
+
+    // Allows FRP-style asynchronous operations in Android.
+    implementation 'io.reactivex:rxandroid:1.2.1'
+    implementation 'com.nononsenseapps:filepicker:4.2.1'
+    implementation 'org.ini4j:ini4j:0.5.4'
+    implementation 'androidx.constraintlayout:constraintlayout:2.1.4'
+    implementation 'androidx.localbroadcastmanager:localbroadcastmanager:1.1.0'
+    implementation 'androidx.swiperefreshlayout:swiperefreshlayout:1.1.0'
+
+    // Please don't upgrade the billing library as the newer version is not GPL-compatible
+    implementation 'com.android.billingclient:billing:2.0.3'
+}
+
+def getVersion() {
+    def versionName = '0.0'
+
+    try {
+        versionName = 'git describe --always --long'.execute([], project.rootDir).text
+                .trim()
+                .replaceAll(/(-0)?-[^-]+$/, "")
+    } catch (Exception) {
+        logger.error('Cannot find git, defaulting to dummy version number')
+    }
+
+    if (System.getenv("GITHUB_ACTIONS") != null) {
+        def gitTag = System.getenv("GIT_TAG_NAME")
+        versionName = gitTag ?: versionName
+    }
+
+    return versionName
+}