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# Android

Ren'Py support devices running the Android operating system, such as smartphones and tablets. While these devices do not support 100% of Ren'Py's functionality, with minimal modification code can be packaged and ported to these devices.

## User Instructions

When a Ren'Py game has been launched on Android, the following keybindings work:

Home
  Returns to the Android home screen, suspending the Ren'Py game. As part of the suspend process, Ren'Py will automatically save the game. If necessary, the save will be automatically loaded when the user returns to the game.
Menu
  Brings up the in-game menu, and returns to the game.
Back
  Rolls back.
Volume Up, Volume Down
  Controls Android's media volume.

## Downloading Ren'Py for Android

Ren'Py for Android is distributed as an engine that must be downloaded separately from the games that use it. Games can be run by placing them in the `renpy` directory on the device's external memory (SD Card), or by downloading a game package. In the latter case, the package will prompt the user to download Ren'Py if it is not installed.

Ren'Py for Android is distributed through the Android market, and as .apk files available on the Ren'Py website. There are two versions of Ren'Py for Android available:

- Ren'Py for Android
- Ren'Py for Android (Beta)

The beta version will be updated when a new version of Ren'Py is undergoing test. While we will attempt to maintain compatibility between Ren'Py versions, the beta version will games to be tested with newer code.

## Platform Differences

There are many important differences between the touch-based Android platform and the mouse-based platforms that Ren'Py supports. Changes due to the Android software and hardware are:

- The touchscreen is treated as if it was a mouse. However, it will only produce mouse events when the user is actively touching the screen. When the user is not touching the screen, the virtual pointer will move to the upper-left corner of the screen.
- `ImageDissolve()`, `AlphaDissolve()`, and `AlphaBlend()` are not supported.
- Functions that render to a texture can only render an opaque texture. This means that the `Dissolve()` and `Pixellate()` transitions will only produce opaque output.
- The `focus_mask` property is not supported. It will be treated as if all pixels in the mask are opaque.
- Movie playback is not supported.
- Launching the web browser is not supported.
- Some python modules (including network communication) modules are not supported.
- Ren'Py cannot change the device volume. However, the android volume buttons work

In addition, there are a few changes that may be necessary due to human factors:

- Since Android smartphones can be smaller than a computer monitor, it may be necessary to increase text size.
- Since touch input is less accurate than mouse input, touch-based buttons need to be larger than mouse-based ones.

To help you adapt to these differences, Ren'Py for Android automatically selects a screen variant of `touch`. See Screen Variants for more information.

## Files

Ren'Py for Android requires you to include android.txt, icon.png, and .nomedia files as part of your game. These files should be placed in the game's base directory. (This is the directory above the game directory)

The layout should look like:

- mygame/android.txt
- mygame/icon.ong
- mygame/main.py
- mygame/.nomedia
- mygame/game/...

### android.txt

The android.txt file is a file that's used to control how your game is displayed in the list of games, and how it is displayed while running.

It is a Java Properties file, which consists of a list of keys separated from values by an equals sign. An example android.txt file is:

    title=The Question
    author=ATP Projects et al.
    api=61200
    orientation=landscape

The following keys are supported:

name
  The title of the game. Displayed in the list of games.
author
  The author of the game. Displayed in the list of games.
api

  The minimum version of Ren'Py this games requires. This should be a number, which is generated from the three components of the Ren'Py version multiplying the first component by 10000, the second component by 100, the third component by 1, and adding the numbers together. For example, version 6.12.0 would use an API version of 61200.

  If the user has an older version of Ren'Py for Android, than the game requires, they will be asked to upgraded to a newer version.

orientation
  One of "portrait" or "landscape". This controls the orientation of the game on the device.

### icon.png

The icon.png file should be a small png file. It's used as an icon in the list of games.

### .nomedia

The .nomedia file should be an empty file. It's used to tell Android not to scan this directory for media files. If it didn't exist, then image and audio files used by the game would be indexed and added to the various galleries on the device.

## Testing the Game

To test the game, place it onto the device's external storage (usually the SD card). This can be done in two ways:

### Mounting the Card

The first is to mount the devices external storage (usually a SD card) on your computer, creating a `renpy` directory on that device, and then placing your game's directory underneath that. Then unmount the card so that the device can read it before running Ren'Py.

### ADB Push

The game can be pushed to the device using the adb tool, which can be downloaded as part of the Android SDK. It's useful to place the adb command into your path.

The game must be placed into a directory underneath the renpy directory on the device's sdcard, using a command like:

    adb push mygame /sdcard/renpy/mygame

### Running

Once the game is on the device, launching Ren'Py will display it in a list of games. Choosing the game from this list will launch it.

If the game encounters problems, the traceback.txt, errors.txt, and log.txt files will be created in the directory on the SD card storing the game.

## Packaging

Note

While the Mac, Windows, and Linux platforms are easy to build distributions for, Android is a bit harder. It requires a large number of external tools to build an APK and place it in the Android market.

Ren'Py games can be converted to .apk packages, for use in the Android market. This can be done using the tools developed for the Pygame for Android package, using a `--engine` argument of `renpy`.

Please see the Pygame Subset for Android documentation for instructions on how to use this tool. Packaging a Ren'Py game will involve a command that looks like:

    ./build.py --dir mygame --package com.domain.mygame \
        --name "My Game" --version 1.0 --engine renpy \
        debug

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