Add support for --presplash-lottie option of p4a

allow using Lottie animation as splashscreen on Android

buildozer/default.spec

@@ -74,13 +74,19 @@ osx.kivy_version = 1.9.1
 # (bool) Indicate if the application should be fullscreen or not
 fullscreen = 0
 
-# (string) Presplash background color (for new android toolchain)
+# (string) Presplash background color (for android toolchain)
 # Supported formats are: #RRGGBB #AARRGGBB or one of the following names:
 # red, blue, green, black, white, gray, cyan, magenta, yellow, lightgray,
 # darkgray, grey, lightgrey, darkgrey, aqua, fuchsia, lime, maroon, navy,
 # olive, purple, silver, teal.
 #android.presplash_color = #FFFFFF
 
+# (string) Presplash animation using Lottie format.
+# see https://lottiefiles.com/ for examples and https://airbnb.design/lottie/
+# for general documentation.
+# Lottie files can be created using various tools, like Adobe After Effect or Synfig.
+#android.presplash_lottie = "path/to/lottie/file.json"
+
 # (list) Permissions
 #android.permissions = INTERNET
 

buildozer/targets/android.py

@@ -1092,7 +1092,12 @@ class TargetAndroid(Target):
         for activity in add_activities:
             build_cmd += [("--add-activity", activity)]
 
-        # add presplash
+        # add presplash, lottie animation or static
+        presplash = config.getdefault('app', 'android.presplash_lottie', '')
+        if presplash:
+            build_cmd += [("--presplash-lottie", join(self.buildozer.root_dir,
+                                                      presplash))]
+        else:
             presplash = config.getdefault('app', 'presplash.filename', '')
             if presplash:
                 build_cmd += [("--presplash", join(self.buildozer.root_dir,