Luanti Android build

All Luanti builds, including the Android variant, are based on the same code. However, additional Java code is used for proper Android integration.

Controls

While you're playing the game normally (that is, no menu or inventory is shown), the following controls are available:

Look around: touch screen and slide finger
Tap: Place a node, punch an object or use the selected item (default)
Long tap: Dig a node or use the selected item (default)
Press back: Pause menu
Touch buttons: Press button
Buttons:

Left upper corner: Chat
Right lower corner: Jump
Right lower corner: Crouch
Left lower corner (Joystick): Walk/step...
Left lower corner: Display inventory

When a menu or inventory is displayed:

Double tap outside menu area: Close menu
Press back: Close menu
Tap on an item stack: Select that stack
Tap on an empty slot: If a stack are selected already, that stack is placed here
Drag and drop: Touch stack and hold finger down, move the stack to another slot, tap another finger while keeping first finger on screen --> places a single item from dragged stack into current (first touched) slot. If a stack is selected, the stack will be split as half and one of the splitted stack will be selected

Limitations

Some old Android device only support 2 touch at a time, some game/mod contain button combination that need 3 touch (example: jump + Aux1 + hold)
Complicated control can be difficult or impossible on Android device

File Path

There are some settings especially useful for Android users. The Luanti-wide configuration file can usually be found at:

Before 5.4.2:
- /sdcard/Minetest/ or /storage/emulated/0/ if stored on the device
- /storage/emulated/(varying folder name)/ if stored on an SD card
After 5.4.2:
- /sdcard/Android/data/net.minetest.minetest/ or /storage/emulated/0/Android/data/net.minetest.minetest/ if stored on the device
- /storage/emulated/(varying folder name)/Android/data/net.minetest.minetest/ if stored on the SD card
Learn more about Android directory

Useful settings

gui_scaling

this is a user-specified scaling factor for the GUI in case main menu is too big or small on your device, try changing this value.

mapblock_limit

Mobile device generally have less RAM than PC, this setting limit how many mapblock can keep in RAM

fps_limit

this setting limit max FPS (Frame per second). Default value is 60, which lowest Android device screen refresh rate commonly found, but if you're using an device have lower refresh rate, change this

Requirements

The recommended system requirements for Luanti are listed below.

CPU

Supported architectures:

ARMv7
AArch64
x86
x86_64

Rendering

Unlike on PC, Android devices use OpenGL ES which less powerful than OpenGL, thus some shader settings cannot be used on OpenGL ES. Changing the graphic driver setting to OpenGL will not work.

Building Requirements

In order to build, your PC has to be set up to build Luanti in the usual manner (see the regular Luanti documentation for how to get this done). In addition to what is required for Luanti in general, you will need the following software packages. The version number in parenthesis denotes the version that was tested at the time this README was drafted; newer/older versions may or may not work.

Android SDK 29
Android NDK r21
Android Studio 3 [optional]

Additionally, you'll need to have an Internet connection available on the build system, as the Android build will download some source packages.

Build

The new build system Luanti Android is fully functional and is designed to speed up and simplify the work, as well as adding the possibility of cross-platform build. You can use ./gradlew assemblerelease or ./gradlew assembledebug from the command line or use Android Studio and click the build button.

When using gradlew, the newest NDK will be downloaded and installed automatically. Or you can create a local.properties file and specify sdk.dir and ndk.dir yourself.

In order to make a release build you'll have to have a keystore setup to sign the resulting apk package. How this is done is not part of this README. There are different tutorials on the web explaining how to do it
- choose one yourself.
Once your keystore is setup, enter the android subdirectory and create a new file "ant.properties" there. Add the following lines to that file:

key.store= key.alias=Minetest

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