Upgrade minsdkversion of RN OSS template to API level 21

Summary:
This diff updates the minsdkversion of RN OSS template to API level 21.

Changelog: [Android][Deprecated] Deprecate support of Android API levels 19 and 20. The new minSDK version will be 21+ moving forward.

Reviewed By: fkgozali

Differential Revision: D24379607

fbshipit-source-id: 6801cdcd363065807cdc11006bd94217f914fac7

.circleci/Dockerfiles/scripts/run-android-docker-instrumentation-tests.sh

@@ -10,7 +10,7 @@ mount -o remount,exec /dev/shm
 AVD_UUID=$(cat /dev/urandom | tr -dc 'a-zA-Z0-9' | fold -w 8 | head -n 1)
 
 # create virtual device
-echo no | android create avd -n "$AVD_UUID" -f -t android-19 --abi default/armeabi-v7a
+echo no | android create avd -n "$AVD_UUID" -f -t android-21 --abi default/armeabi-v7a
 
 # emulator setup
 emulator64-arm -avd $AVD_UUID -no-skin -no-audio -no-window -no-boot-anim &

.circleci/Dockerfiles/scripts/run-ci-e2e-tests.sh

@@ -109,7 +109,7 @@ function e2e_suite() {
 
         # create virtual device
         if ! android list avd | grep "$AVD_UUID" > /dev/null; then
-            echo no | android create avd -n "$AVD_UUID" -f -t android-19 --abi default/armeabi-v7a
+            echo no | android create avd -n "$AVD_UUID" -f -t android-21 --abi default/armeabi-v7a
         fi
 
         # newline at end of adb devices call and first line is headers

.circleci/config.yml

@@ -642,7 +642,7 @@ jobs:
           name: Setup Android SDKs
           command: |
             sdkmanager --licenses
-            sdkmanager "system-images;android-19;google_apis;armeabi-v7a"
+            sdkmanager "system-images;android-21;google_apis;armeabi-v7a"
             sdkmanager "platforms;android-%ANDROID_BUILD_VERSION%"
             sdkmanager "build-tools;%ANDROID_TOOLS_VERSION%"
             sdkmanager "add-ons;addon-google_apis-google-23"

ReactAndroid/build.gradle

@@ -393,7 +393,7 @@ android {
     }
 
     defaultConfig {
-        minSdkVersion(19)
+        minSdkVersion(21)
         targetSdkVersion(28)
         versionCode(1)
         versionName("1.0")

ReactAndroid/src/main/jni/Application.mk

@@ -6,7 +6,7 @@
 APP_BUILD_SCRIPT := Android.mk
 
 APP_ABI := armeabi-v7a x86 arm64-v8a x86_64
-APP_PLATFORM := android-16
+APP_PLATFORM := android-21
 
 APP_MK_DIR := $(dir $(lastword $(MAKEFILE_LIST)))
 

packages/rn-tester/android/app/build.gradle

@@ -147,7 +147,7 @@ android {
 
     defaultConfig {
         applicationId "com.facebook.react.uiapp"
-        minSdkVersion 19
+        minSdkVersion 21
         targetSdkVersion 29
         versionCode 1
         versionName "1.0"
@@ -250,7 +250,7 @@ if (enableCodegen) {
             externalNativeBuild {
                 ndkBuild {
                     abiFilters "armeabi-v7a", "x86", "x86_64", "arm64-v8a"
-                    arguments "APP_PLATFORM=android-16",
+                    arguments "APP_PLATFORM=android-21",
                             "APP_STL=c++_shared",
                             "NDK_TOOLCHAIN_VERSION=clang",
                             // The following paths assume building React Native from source.

template/android/build.gradle

@@ -3,7 +3,7 @@
 buildscript {
     ext {
         buildToolsVersion = "29.0.3"
-        minSdkVersion = 19
+        minSdkVersion = 21
         compileSdkVersion = 29
         targetSdkVersion = 29
         ndkVersion = "20.1.5948944"