Update instructions to setup Exporting for Android (#4520)

getting_started/workflow/export/exporting_for_android.rst

@@ -9,24 +9,33 @@ The following steps detail what is needed to setup the SDK and the engine.
 Download the Android SDK
 ------------------------
 
-Download and install the Android SDK from
-`developer.android.com <https://developer.android.com/studio/>`__.
+Download and install the Android SDK. 
 
-If you install Android Studio, you need to run it once to complete the SDK setup.
+- You can install it using `Android Studio <https://developer.android.com/studio/>`__.
+  
+  - Run it once to complete the SDK setup using these `instructions <https://developer.android.com/studio/intro/update#sdk-manager>`__.
+  - Ensure that the `required packages <https://developer.android.com/studio/intro/update#recommended>`__ are installed as well.
 
-Install OpenJDK 8
+- You can install it using the `command line tools <https://developer.android.com/studio/#command-tools>`__.
+  
+  - Once the command line tools are installed, run the `sdkmanager <https://developer.android.com/studio/command-line/sdkmanager>`__ command to complete the setup process:
+
+::
+
+    sdkmanager --sdk_root=<android_sdk_path> "platform-tools" "build-tools;30.0.1" "platforms;android-29" "cmdline-tools;latest"
+
+Install OpenJDK
 -----------------
 
-Download and install  `OpenJDK 8 <https://adoptopenjdk.net/index.html?variant=openjdk8&jvmVariant=hotspot>`__,
-newer versions do not work.
+Download and install  `OpenJDK <https://adoptopenjdk.net/index.html>`__.
 
 Create a debug.keystore
 -----------------------
 
 Android needs a debug keystore file to install to devices and distribute
 non-release APKs. If you have used the SDK before and have built
-projects, ant or eclipse probably generated one for you (on Linux and
-macOS, you can find it in the ``~/.android`` directory).
+projects, ant or eclipse probably generated one for you (in the ``~/.android`` directory on Linux and
+macOS, in the ``C:\Users\<user>\.android\`` directory on Windows).
 
 If you can't find it or need to generate one, the keytool command from
 the JDK can be used for this purpose::
@@ -35,13 +44,6 @@ the JDK can be used for this purpose::
 
 This will create a ``debug.keystore`` file in your current directory. You should move it to a memorable location such as ``%USERPROFILE%\.android\``, because you will need its location in a later step. For more information on ``keytool`` usage, see `this Q&A article <https://godotengine.org/qa/21349/jdk-android-file-missing>`__.
 
-Make sure you have adb
-----------------------
-
-Android Debug Bridge (``adb``) is the command line tool used to communicate with
-Android devices. It's installed with the SDK, but you may need to install one
-(any) of the Android API levels for it to be installed in the SDK directory.
-
 Setting it up in Godot
 ----------------------
 
@@ -55,13 +57,10 @@ Scroll down to the section where the Android settings are located:
 
 .. image:: img/androidsdk.png
 
-In that screen, the path to 3 files needs to be set:
+In that screen, 2 paths need to be set:
 
-- The ``adb`` executable (``adb.exe`` on Windows)
-  - It can usually be found at ``%LOCALAPPDATA%\Android\Sdk\platform-tools\adb.exe``.
-
-- The ``jarsigner`` executable (from JDK 6 or 8)
-  - On Windows, OpenJDK installs to a directory like ``%PROGRAMFILES%\AdoptOpenJDK\jdk-8.0.252.09-hotspot\bin``. On Linux, it typically installs to a directory like ``/usr/bin/jarsigner``. The exact path may vary depending on the OpenJDK update you've installed and your machine's operating system.
+- The ``Android Sdk Path`` should be the location where the Android SDK was installed.
+  - For example ``%LOCALAPPDATA%\Android\Sdk\`` on Windows or ``/Users/$USER/Library/Android/sdk/`` on macOS.
 
 - The debug ``.keystore`` file
   - It can be found in the folder where you put the ``debug.keystore`` file you created above.