fixes release mode misdetection in android_old and android + fix gradle detection when copying the apk

buildozer/targets/android.py

@@ -774,7 +774,7 @@ class TargetAndroid(Target):
             mode = 'debug'
         else:
             build_cmd += [("release", )]
-            mode = 'release-unsigned'
+            mode = self.get_release_mode()
 
         self.execute_build_package(build_cmd)
 
@@ -787,7 +787,10 @@ class TargetAndroid(Target):
             pass
 
         # XXX found how the apk name is really built from the title
-        if exists(join(dist_dir, "build.gradle")):
+        gradle_files = ["build.gradle", "gradle", "gradlew"]
+        is_gradle_build = any((
+            exists(join(dist_dir, x)) for x in gradle_files))
+        if is_gradle_build:
             # on gradle build, the apk use the package name, and have no version
             packagename = config.get('app', 'package.name')
             apk = u'{packagename}-{mode}.apk'.format(
@@ -819,6 +822,9 @@ class TargetAndroid(Target):
         self.buildozer.state['android:latestapk'] = apk_dest
         self.buildozer.state['android:latestmode'] = self.build_mode
 
+    def get_release_mode(self):
+        return "release-unsigned"
+
     def _update_libraries_references(self, dist_dir):
         # ensure the project.properties exist
         project_fn = join(dist_dir, 'project.properties')

buildozer/targets/android_new.py

@@ -4,6 +4,7 @@ Android target, based on python-for-android project
 '''
 
 import sys
+import os
 
 from buildozer import USE_COLOR
 from buildozer.targets.android import TargetAndroid
@@ -94,7 +95,8 @@ class TargetAndroidNew(TargetAndroid):
                 continue
             elif option == "release":
                 cmd.append("--release")
-                cmd.append("--sign")
+                if self.check_p4a_sign_env(True):
+                    cmd.append("--sign")
                 continue
             if option == "--window":
                 cmd.append("--window")
@@ -153,6 +155,24 @@ class TargetAndroidNew(TargetAndroid):
         cmd = " ".join(cmd)
         self._p4a(cmd)
 
+    def get_release_mode(self):
+        if self.check_p4a_sign_env():
+            return "release"
+        return "release-unsigned"
+
+    def check_p4a_sign_env(self, error=False):
+        keys = ["KEYALIAS", "KEYSTORE_PASSWD", "KEYSTORE", "KEYALIAS_PASSWD"]
+        check = True
+        for key in keys:
+            key = "P4A_RELEASE_{}".format(key)
+            if key not in os.environ:
+                if error:
+                    self.buildozer.error(
+                        ("Asking for release but {} is missing"
+                         "--sign will not be passed").format(key))
+                check = False
+        return check
+
     def cmd_run(self, *args):
         entrypoint = self.buildozer.config.getdefault(
             'app', 'android.entrypoint')