Fix issue #881: Add android.allow_backup parameter to buildozer.spec (#1206)

* Add android.allow_backup parameter to buildozer.spec
* Rework patch to only use --allow-backup when it is set to false
* Added testcase for android.allow_backup
* Added default value for android.allow_backup to spec

buildozer/default.spec

@@ -228,6 +228,9 @@ android.arch = armeabi-v7a
 # this is not the same as app version and should only be edited if you know what you're doing
 # android.numeric_version = 1
 
+# (bool) enables Android auto backup feature (Android API >=23)
+android.allow_backup = True
+
 #
 # Python for android (p4a) specific
 #

buildozer/targets/android.py

@@ -1158,6 +1158,11 @@ class TargetAndroid(Target):
         if numeric_version:
             build_cmd += [("--numeric-version", numeric_version)]
 
+        # android.allow_backup
+        allow_backup = config.getbooldefault('app', 'android.allow_backup', True)
+        if not allow_backup:
+            build_cmd += [('--allow-backup', 'false')]
+
         # build only in debug right now.
         if self.build_mode == 'debug':
             build_cmd += [("debug", )]

tests/targets/test_android.py

@@ -298,3 +298,29 @@ class TestTargetAndroid:
                 ]
             )
         ]
+
+    def test_allow_backup(self):
+        """The `android.allow_backup` config should be passed to `build_package()`."""
+        target_android = init_target(self.temp_dir, {
+            "android.allow_backup": "false"
+        })
+        buildozer = target_android.buildozer
+        m_execute_build_package = call_build_package(target_android)
+        assert m_execute_build_package.call_args_list == [
+            mock.call(
+                [
+                    ("--name", "'My Application'"),
+                    ("--version", "0.1"),
+                    ("--package", "org.test.myapp"),
+                    ("--minsdk", "21"),
+                    ("--ndk-api", "21"),
+                    ("--private", "{buildozer_dir}/android/app".format(buildozer_dir=buildozer.buildozer_dir)),
+                    ("--android-entrypoint", "org.kivy.android.PythonActivity"),
+                    ("--android-apptheme", "@android:style/Theme.NoTitleBar"),
+                    ("--orientation", "portrait"),
+                    ("--window",),
+                    ("--allow-backup", "false"),
+                    ("debug",),
+                ]
+            )
+        ]