Initial commit.

src/emulator-launcher.ts

@@ -0,0 +1,8 @@
+/**
+ * Creates and launches a new AVD instance with the specified configurations.
+ */
+export async function startEmulator(
+
+): Promise<void> {
+  // TODO
+}

src/main.ts

@@ -0,0 +1,50 @@
+import * as core from '@actions/core';
+import { installAndroidSdk } from './sdk-installer'
+
+async function run() {
+  try {
+    // only support running on macOS
+    if (process.platform !== 'darwin') {
+      throw new Error('This action is expected to be run within a macOS virtual machine to enable hardware acceleration.');
+    }
+
+    // TODO test inputs
+    // TODO test real inputs in test.yml
+
+    // api-level is required
+    // TODO use InputOptions {true}
+    const apiLevel = core.getInput('api-level');
+    // TODO check apiLevel is number and within valid range
+    console.log(`API level - ${apiLevel}`);
+
+    // target is optional with default
+    const target = core.getInput('target');
+    if (target !== 'default' && target !== 'google_apis') {
+      throw new Error(`Target ${target} is unknown. Please use either 'default' or 'google_apis'.`);
+    }
+    console.log(`target - ${target}`);
+
+    // abi is optional with default
+    const abi = core.getInput('abi');
+    if (abi !== 'x86' && abi !== 'x86_64') {
+      throw new Error(`abi ${abi} is unknown (ARM-based emulators are not supported). Please use either 'x86' or 'x86_64'.`);
+    }
+    console.log(`cpu/abi - ${abi}`);
+
+    // headless is optional with default
+    const headless = core.getInput('headless');
+    if (headless !== 'true' && headless !== 'false') {
+      throw new Error(`Input 'headless' should be either 'true' or 'false'.`);
+    }
+    console.log(`headless mode - ${headless}`);
+
+    // install SDK
+    await installAndroidSdk(Number(apiLevel), target, abi);
+
+    // TODO start emulator
+  } catch (error) {
+    core.setFailed(error.message);
+  }
+}
+
+run();

src/sdk-installer.ts

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+import * as exec from '@actions/exec';
+import * as tc from '@actions/tool-cache';
+import * as fs from 'fs';
+
+const BUILD_TOOLS_VERSION = '29.0.2';
+const SDK_URL = 'https://dl.google.com/android/repository/sdk-tools-darwin-4333796.zip';
+
+/**
+ * Downloads and installs the Android SDK for the macOS platform, including SDK platform for the chosen API level, latest build tools, platform tools, Android Emulator,
+ * and the system image for the chosen API level, cpu/abi, and target.
+ */
+export async function installAndroidSdk(apiLevel: number, abi: string, target: string): Promise<void> {
+  // download Android SDK if not already installed
+  if (fs.existsSync(`${process.env.ANDROID_HOME}/tools/bin/sdkmanager`)) {
+    console.log('Android SDK already installed.');
+  } else {
+    console.log('Downloading Android SDK.');
+    const downloadedSdkPath = await tc.downloadTool(SDK_URL);
+    await tc.extractZip(downloadedSdkPath, process.env.ANDROID_HOME);
+  }
+
+  // install specific SDK tools
+  console.log('Installing build tools, platform tools, platform and system image.');
+  await exec.exec(`yes | ${process.env.ANDROID_HOME}/tools/bin/sdkmanager --licenses`);
+  await exec.exec(`${process.env.ANDROID_HOME}/tools/bin/sdkmanager --update`);
+  await exec.exec(`${process.env.ANDROID_HOME}/tools/bin/sdkmanager "build-tools;${BUILD_TOOLS_VERSION}"`);
+  await exec.exec(`${process.env.ANDROID_HOME}/tools/bin/sdkmanager "platform-tools"`);
+  await exec.exec(`${process.env.ANDROID_HOME}/tools/bin/sdkmanager "platforms;android-${apiLevel}"`);
+  await exec.exec(`${process.env.ANDROID_HOME}/tools/bin/sdkmanager "system-images;android-${apiLevel};${target};${abi}"`);
+}