Remove duplicate setup instructions from android custom build page

tutorials/export/android_custom_build.rst

@@ -13,10 +13,9 @@ There are some reasons why you may want to do this:
 * Modify the project before it's built.
 * Add external SDKs that build with your project.
 
-Configuring the custom build is a more or less straightforward process,
-but it may take a while to get used to how the Android SDK works.
-
-Instructions will be provided as detailed as possible to do this process.
+Configuring the custom build is a fairly straightforward process. But first
+you need to follow the steps in :ref:`exporting for android<doc_exporting_for_android>`
+up to **Setting it up in Godot**. After doing that, follow the steps below.
 
 Set up the custom build environment
 -----------------------------------
@@ -32,239 +31,6 @@ A Gradle-based Android project will be created under ``res://android/build``.
 Editing these files is not needed unless you want to :ref:`create
 your own add-ons<doc_android_plugin>`, or you really need to modify the project.
 
-Install the Android SDK (command-line version)
-----------------------------------------------
-
-These are the steps for installing the Android SDK using command line. The
-advantage of this approach is the simplicity and small download/install size. It
-can be more challenging though. The Android Studio approach is easier, but it
-requires downloading and installing Android Studio (which may require more than
-1 GB of storage).
-
-Install a JDK
-^^^^^^^^^^^^^
-
-The Android SDK doesn't come with Java, so it needs to be installed manually.
-You need to install a Java SDK (**not** just the runtime or JRE).
-`OpenJDK 8 <https://adoptopenjdk.net/index.html>`__ is required, newer
-versions won't work.
-
-On Windows, make sure that you enable "Set ``JAVA_HOME`` variable" in the *Custom Setup* view
-of the installer. You have to restart Godot after this, otherwise Godot can't
-find the ``JAVA_HOME`` variable.
-
-Download the command-line tools
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-
-Go to the `Android Studio download page <https://developer.android.com/studio/#command-tools>`_.
-To save disk space, you don't want the full IDE, so don't download it.
-
-.. note::
-
-    If you do want Android Studio, read further down for instructions for
-    doing the same using Android Studio.
-
-Look on that page for the *Command line tools only* section. Currently, they are listed under
-*Download Options*. Scroll down a bit until you see them and download the ZIP file for
-your platform.
-
-This may appear a little confusing, but be sure to follow these instructions
-carefully:
-
-Create a new folder anywhere you want named ``android-sdk`` (it **must** be
-an empty directory). On Windows, the following path is usually good enough:
-
-.. code-block:: none
-
-  C:\users\<yourusername>\android-sdk
-
-Create an empty folder named ``cmdline-tools`` inside of the ``android-sdk`` folder.
-Then unzip the Android SDK ZIP file into the ``android-sdk/cmdline-tools`` folder.
-
-.. note::
-
-    If you're on Windows, you must not extract the ZIP archive with the default
-    Windows extractor (e.g. Windows Explorer). You have to use another tool
-    like 7zip, WinRAR or the Powershell ``Expand-Archive`` command. If you
-    extract the archive with the default Windows extractor, the files are not
-    extracted correctly and you will run into errors later on!
-
-The ``cmdline-tools`` folder should now contain the unzipped folder called ``tools``.
-Finally, rename the ``tools`` folder to ``latest``.
-
-Your final directory structure should look like this :
-
-.. code-block:: none
-
-  android-sdk/
-  android-sdk/cmdline-tools/
-  android-sdk/cmdline-tools/latest
-  android-sdk/cmdline-tools/latest/allTheOtherFiles
-
-We need to setup the directory structure this way for the sdkmanager (inside the bin folder) to work.
-
-Accepting the licenses
-^^^^^^^^^^^^^^^^^^^^^^
-
-To be able to use the Android SDK tools, Google requires you to accept
-its licenses.
-
-To do this, the ``sdkmanager`` must be executed from the command line with a
-special argument. Navigate to the ``tools/bin`` directory inside the SDK folder
-(instructions provided for Windows users, as Linux and macOS users are expected
-to understand how command line navigation works):
-
-.. image:: img/custom_build_bin_folder.png
-
-Then open a command line window:
-
-.. image:: img/custom_build_open_shell.png
-
-In there, run ``sdkmanager --licenses``:
-
-.. image:: img/custom_build_sdkmanager.png
-
-This will ask you to accept several licenses, just write ``y`` and press :kbd:`Enter`
-on every of them until it's done.
-
-Afterwards, install the platform tools (this is required to install ``adb``):
-
-.. image:: img/custom_build_platform_tools.png
-
-If you get an error saying ``Warning: Could not create settings``, try ``./sdkmanager --sdk_root=../../ --licenses`` or ``./sdkmanager --sdk_root=../../ platform-tools``. These must be executed inside the ``/tools/bin/`` folder because the path for ``--sdk_root`` is relative.
-
-Generating the keystore
-^^^^^^^^^^^^^^^^^^^^^^^
-
-Once the *platform tools* are installed, the last step is to generate a debug
-keystore (this is needed to build). Go up two folders by writing:
-
-.. code-block:: shell
-
-    cd ..\..\..
-
-(or open a new shell in the ``android-sdk`` folder).
-
-And you need to input the following line (This should work out of the box.
-However, if you haven't set the ``JAVA_HOME`` variable on Windows,
-there are further instructions below):
-
-.. code-block:: shell
-
-    keytool -keyalg RSA -genkeypair -alias androiddebugkey -keypass android -keystore debug.keystore -storepass android -dname "CN=Android Debug,O=Android,C=US" -validity 9999
-
-On Windows, if you did not install the ``JAVA_HOME`` variable, the full path to Java
-should be provided. You need to add ``&`` at the beginning of the line if you use
-PowerShell; it's not needed for the regular ``cmd.exe`` console.
-
-To make it clearer, here is an capture of a line that works on PowerShell (by
-adding ``&`` and the full Java path before ``keytool.exe``). Again, keep in mind that you
-need Java installed:
-
-.. image:: img/custom_build_command_line.png
-
-(right-click and open the image in a new tab if this appears too small)
-
-
-Setting up Godot
-^^^^^^^^^^^^^^^^
-
-Go to the **Editor Settings** and set up a few fields in **Export > Android**.
-Make sure they look like the following:
-
-.. image:: img/custom_build_editor_settings.png
-
-(right-click and open the image in a new tab if this appears too small)
-
-As it can be seen, most paths are inside either the ``android-sdk`` folder you
-originally created, or inside the Java install. For Linux and macOS users,
-``jarsigner`` is often located in ``/usr/bin``.
-
-With this, you should be all set.
-
-
-Install the Android SDK (Android Studio)
-----------------------------------------
-
-If you just finished installing the SDK via the command-line tools, feel free to
-skip this section entirely. The Android Studio path is easier, but it takes up
-more disk space. It's also useful if you plan to develop Godot for Android
-(modify the Java source code) or if you plan to develop add-ons.
-
-Download and install Android Studio
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-
-Download the latest version of Android Studio. When installing, pay attention to
-where the *android-sdk* directory is created.
-
-.. image:: img/custom_build_install_android_studio1.png
-
-.. note:: This is funny, the path it proposes by default contains whitespace (and complains about it). It must be changed.
-
-In any case, it's better to select a different path inside your user folders.
-The recommended one is usually:
-
-.. code-block:: none
-
-  C:\Users\<yourusername>\Documents\android-sdk
-
-Replace *yourusername* by your actual user name. Once it's correct, select from
-the list above in the same screen:
-
-* Android SDK
-* Android SDK Platform
-
-The rest are not needed, because the build system will fetch them itself. After
-selecting them, go on with the installation.
-
-
-Generating the keystore
-^^^^^^^^^^^^^^^^^^^^^^^
-
-Go to the folder where you installed ``android-sdk`` in the previous step, use File
-Explorer and open a command line tool there:
-
-.. image:: img/custom_build_open_shell.png
-
-The actual command line to type is the following. On Linux and macOS, it should
-work out of the box, but on Windows, it needs additional details (keep reading
-afterwards).
-
-.. code-block:: shell
-
-    keytool -keyalg RSA -genkeypair -alias androiddebugkey -keypass android -keystore debug.keystore -storepass android -dname "CN=Android Debug,O=Android,C=US" -validity 9999
-
-On Windows, the full path to Java should be provided (and ``&`` needs to be
-added at the beginning on the line if you use PowerShell, it's not needed for
-the regular ``cmd.exe`` console). Don't worry, at least by using Android Studio
-on Windows, Java comes bundled with it.
-
-To make it clearer, here is a screen capture of a line that works on PowerShell
-(by adding ``&`` and the full Java Path to ``keytool.exe``; remove ``&`` if you
-use ``cmd.exe``). It uses a path to the Java version that comes with Android
-Studio:
-
-.. image:: img/custom_build_command_line2.png
-
-(right-click and open the image in a new tab if this appears too small)
-
-
-Setting up Godot
-^^^^^^^^^^^^^^^^
-
-Go to the **Editor Settings** and set up a few fields in **Export > Android**.
-Make sure they look like the following:
-
-.. image:: img/custom_build_editor_settings2.png
-
-(right-click and open the image in a new tab if this appears too small)
-
-As it can be seen, most paths are inside either the ``android-sdk`` folder you
-originally created, or inside the Java install. For Linux and macOS users,
-``jarsigner`` is often located in ``/usr/bin``.
-
-With this, you should be all set.
-
 
 Enabling the custom build and exporting
 ---------------------------------------