Install platforms for the specified api level (#384)

* Install platforms for the specified api level

* Fix typo

Author: joshrlesch

lib/sdk-installer.js

@@ -70,7 +70,7 @@ function installAndroidSdk(apiLevel, target, arch, channelId, emulatorBuild, ndk
             // accept all Android SDK licenses
             yield exec.exec(`sh -c \\"yes | sdkmanager --licenses > /dev/null"`);
             console.log('Installing latest build tools, platform tools, and platform.');
-            yield exec.exec(`sh -c \\"sdkmanager --install 'build-tools;${BUILD_TOOLS_VERSION}' platform-tools > /dev/null"`);
+            yield exec.exec(`sh -c \\"sdkmanager --install 'build-tools;${BUILD_TOOLS_VERSION}' platform-tools 'platforms;android-${apiLevel}'> /dev/null"`);
             console.log('Installing latest emulator.');
             yield exec.exec(`sh -c \\"sdkmanager --install emulator --channel=${channelId} > /dev/null"`);
             if (emulatorBuild) {

src/sdk-installer.ts

@@ -43,7 +43,7 @@ export async function installAndroidSdk(apiLevel: string, target: string, arch:
 
     console.log('Installing latest build tools, platform tools, and platform.');
 
-    await exec.exec(`sh -c \\"sdkmanager --install 'build-tools;${BUILD_TOOLS_VERSION}' platform-tools > /dev/null"`);
+    await exec.exec(`sh -c \\"sdkmanager --install 'build-tools;${BUILD_TOOLS_VERSION}' platform-tools 'platforms;android-${apiLevel}'> /dev/null"`);
 
     console.log('Installing latest emulator.');
     await exec.exec(`sh -c \\"sdkmanager --install emulator --channel=${channelId} > /dev/null"`);