Android: Gradle updates (#6653)

* android: Migrate to Kotlin DSL

Includes updates to all android dependencies/ndk (minus billing) and adds support for Kotlin, Android 13, and view binding.

* android: Remove unused tests

* android: Remove unused dependencies

src/android/app/build.gradle.kts

@@ -0,0 +1,203 @@
+// Copyright 2023 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+import android.databinding.tool.ext.capitalizeUS
+
+plugins {
+    id("com.android.application")
+    id("org.jetbrains.kotlin.android")
+}
+
+/**
+ * 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.
+ */
+val autoVersion = (((System.currentTimeMillis() / 1000) - 1451606400) / 10).toInt()
+val abiFilter = listOf("arm64-v8a"/*, "x86", "x86_64"*/)
+
+@Suppress("UnstableApiUsage")
+android {
+    namespace = "org.citra.citra_emu"
+
+    compileSdkVersion = "android-33"
+    ndkVersion = "25.2.9519653"
+
+    compileOptions {
+        sourceCompatibility = JavaVersion.VERSION_17
+        targetCompatibility = JavaVersion.VERSION_17
+    }
+
+    kotlinOptions {
+        jvmTarget = "17"
+    }
+
+    buildFeatures {
+        viewBinding = true
+    }
+
+    lint {
+        // 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 {
+        // TODO If this is ever modified, change application_id in strings.xml
+        applicationId = "org.citra.citra_emu"
+        minSdk = 28
+        targetSdk = 33
+        versionCode = autoVersion
+        versionName = getGitVersion()
+
+        ndk {
+            //noinspection ChromeOsAbiSupport
+            abiFilters += abiFilter
+        }
+
+        externalNativeBuild {
+            cmake {
+                arguments(
+                    "-DENABLE_QT=0", // Don't use QT
+                    "-DENABLE_SDL2=0", // Don't use SDL
+                    "-DANDROID_ARM_NEON=true" // cryptopp requires Neon to work
+                )
+            }
+        }
+    }
+
+    val keystoreFile = System.getenv("ANDROID_KEYSTORE_FILE")
+    if (keystoreFile != null) {
+        signingConfigs {
+            create("release") {
+                storeFile = file(keystoreFile)
+                storePassword = System.getenv("ANDROID_KEYSTORE_PASS")
+                keyAlias = System.getenv("ANDROID_KEY_ALIAS")
+                keyPassword = System.getenv("ANDROID_KEYSTORE_PASS")
+            }
+        }
+    }
+
+    // Define build types, which are orthogonal to product flavors.
+    buildTypes {
+        // Signed by release key, allowing for upload to Play Store.
+        release {
+            signingConfig = if (keystoreFile != null) {
+                signingConfigs.getByName("release")
+            } else {
+                signingConfigs.getByName("debug")
+            }
+        }
+
+        // builds a release build that doesn't need signing
+        // Attaches 'debug' suffix to version and package name, allowing installation alongside the release build.
+        register("relWithDebInfo") {
+            initWith(getByName("release"))
+            applicationIdSuffix = ".debug"
+            versionNameSuffix = "-debug"
+            signingConfig = signingConfigs.getByName("debug")
+            isMinifyEnabled = false
+            isDebuggable = true
+            isJniDebuggable = 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"
+            isDebuggable = true
+            isJniDebuggable = true
+        }
+    }
+
+    flavorDimensions.add("version")
+    productFlavors {
+        create("canary") {
+            dimension = "version"
+            applicationIdSuffix = ".canary"
+        }
+
+        create("nightly") {
+            dimension = "version"
+        }
+    }
+
+    externalNativeBuild {
+        cmake {
+            version = "3.22.1"
+            path = file("../../../CMakeLists.txt")
+        }
+    }
+}
+
+dependencies {
+    implementation("androidx.activity:activity-ktx:1.7.2")
+    implementation("androidx.fragment:fragment-ktx:1.6.0")
+    implementation("androidx.appcompat:appcompat:1.6.1")
+    implementation("androidx.documentfile:documentfile:1.0.1")
+    implementation("androidx.lifecycle:lifecycle-viewmodel-ktx:2.6.1")
+    implementation("androidx.slidingpanelayout:slidingpanelayout:1.2.0")
+    implementation("com.google.android.material:material:1.9.0")
+    implementation("androidx.core:core-splashscreen:1.0.1")
+    implementation("androidx.work:work-runtime:2.8.1")
+
+    // 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("org.ini4j:ini4j:0.5.4")
+    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")
+}
+
+fun getGitVersion(): String {
+    var versionName = "0.0"
+
+    try {
+        versionName = ProcessBuilder("git", "describe", "--always", "--long")
+            .directory(project.rootDir)
+            .redirectOutput(ProcessBuilder.Redirect.PIPE)
+            .redirectError(ProcessBuilder.Redirect.PIPE)
+            .start().inputStream.bufferedReader().use { it.readText() }
+            .trim()
+            .replace(Regex("(-0)?-[^-]+$"), "")
+    } catch (e: Exception) {
+        logger.error("Cannot find git, defaulting to dummy version number")
+    }
+
+    if (System.getenv("GITHUB_ACTIONS") != null) {
+        val gitTag = System.getenv("GIT_TAG_NAME")
+        versionName = gitTag ?: versionName
+    }
+
+    return versionName
+}
+
+android.applicationVariants.configureEach {
+    val variant = this
+    val capitalizedName = variant.name.capitalizeUS()
+
+    val copyTask = tasks.register("copyBundle${capitalizedName}") {
+        doLast {
+            project.copy {
+                from(variant.outputs.first().outputFile.parentFile)
+                include("*.apk")
+                into(layout.buildDirectory.dir("bundle"))
+            }
+            project.copy {
+                from(layout.buildDirectory.dir("outputs/bundle/${variant.name}"))
+                include("*.aab")
+                into(layout.buildDirectory.dir("bundle"))
+            }
+        }
+    }
+    tasks.named("bundle${capitalizedName}").configure { finalizedBy(copyTask) }
+}