Make BackgroundMode public. (#45747)

shell/platform/android/BUILD.gn

@@ -419,6 +419,7 @@ action("robolectric_tests") {
     "test/io/flutter/embedding/android/FlutterAndroidComponentTest.java",
     "test/io/flutter/embedding/android/FlutterFragmentTest.java",
     "test/io/flutter/embedding/android/FlutterViewTest.java",
+    "test/io/flutter/embedding/android/RobolectricFlutterActivity.java",
     "test/io/flutter/embedding/engine/FlutterEngineCacheTest.java",
     "test/io/flutter/embedding/engine/FlutterEngineTest.java",
     "test/io/flutter/embedding/engine/FlutterJNITest.java",
@@ -429,6 +430,7 @@ action("robolectric_tests") {
     "test/io/flutter/embedding/engine/plugins/shim/ShimPluginRegistryTest.java",
     "test/io/flutter/embedding/engine/renderer/FlutterRendererTest.java",
     "test/io/flutter/embedding/engine/systemchannels/PlatformChannelTest.java",
+    "test/io/flutter/external/FlutterLaunchTests.java",
     "test/io/flutter/plugin/common/StandardMessageCodecTest.java",
     "test/io/flutter/plugin/editing/TextInputPluginTest.java",
     "test/io/flutter/plugin/platform/SingleViewPresentationTest.java",

shell/platform/android/io/flutter/embedding/android/FlutterActivityLaunchConfigs.java

@@ -4,23 +4,29 @@
 
 package io.flutter.embedding.android;
 
-class FlutterActivityLaunchConfigs {
+/**
+ * Collection of Flutter launch configuration options.
+ */
+// This class is public so that Flutter app developers can reference
+// BackgroundMode
+@SuppressWarnings("WeakerAccess")
+public class FlutterActivityLaunchConfigs {
   // Meta-data arguments, processed from manifest XML.
-  static final String DART_ENTRYPOINT_META_DATA_KEY = "io.flutter.Entrypoint";
-  static final String INITIAL_ROUTE_META_DATA_KEY = "io.flutter.InitialRoute";
-  static final String SPLASH_SCREEN_META_DATA_KEY = "io.flutter.embedding.android.SplashScreenDrawable";
-  static final String NORMAL_THEME_META_DATA_KEY = "io.flutter.embedding.android.NormalTheme";
+  /* package */ static final String DART_ENTRYPOINT_META_DATA_KEY = "io.flutter.Entrypoint";
+  /* package */ static final String INITIAL_ROUTE_META_DATA_KEY = "io.flutter.InitialRoute";
+  /* package */ static final String SPLASH_SCREEN_META_DATA_KEY = "io.flutter.embedding.android.SplashScreenDrawable";
+  /* package */ static final String NORMAL_THEME_META_DATA_KEY = "io.flutter.embedding.android.NormalTheme";
 
   // Intent extra arguments.
-  static final String EXTRA_INITIAL_ROUTE = "initial_route";
-  static final String EXTRA_BACKGROUND_MODE = "background_mode";
-  static final String EXTRA_CACHED_ENGINE_ID = "cached_engine_id";
-  static final String EXTRA_DESTROY_ENGINE_WITH_ACTIVITY = "destroy_engine_with_activity";
+  /* package */ static final String EXTRA_INITIAL_ROUTE = "initial_route";
+  /* package */ static final String EXTRA_BACKGROUND_MODE = "background_mode";
+  /* package */ static final String EXTRA_CACHED_ENGINE_ID = "cached_engine_id";
+  /* package */ static final String EXTRA_DESTROY_ENGINE_WITH_ACTIVITY = "destroy_engine_with_activity";
 
   // Default configuration.
-  static final String DEFAULT_DART_ENTRYPOINT = "main";
-  static final String DEFAULT_INITIAL_ROUTE = "/";
-  static final String DEFAULT_BACKGROUND_MODE = BackgroundMode.opaque.name();
+  /* package */ static final String DEFAULT_DART_ENTRYPOINT = "main";
+  /* package */ static final String DEFAULT_INITIAL_ROUTE = "/";
+  /* package */ static final String DEFAULT_BACKGROUND_MODE = BackgroundMode.opaque.name();
 
   /**
    * The mode of the background of a Flutter {@code Activity}, either opaque or transparent.

shell/platform/android/test/io/flutter/FlutterTestSuite.java

@@ -18,6 +18,7 @@
 import io.flutter.embedding.engine.plugins.shim.ShimPluginRegistryTest;
 import io.flutter.embedding.engine.renderer.FlutterRendererTest;
 import io.flutter.embedding.engine.systemchannels.PlatformChannelTest;
+import io.flutter.external.FlutterLaunchTests;
 import io.flutter.plugin.common.StandardMessageCodecTest;
 import io.flutter.plugin.editing.TextInputPluginTest;
 import io.flutter.plugin.platform.SingleViewPresentationTest;
@@ -37,6 +38,7 @@
     FlutterEngineTest.class,
     FlutterFragmentTest.class,
     FlutterJNITest.class,
+    FlutterLaunchTests.class,
     FlutterShellArgsTest.class,
     FlutterRendererTest.class,
     FlutterViewTest.class,

shell/platform/android/test/io/flutter/embedding/android/RobolectricFlutterActivity.java

@@ -0,0 +1,34 @@
+package io.flutter.embedding.android;
+
+import android.content.Intent;
+
+import org.robolectric.Robolectric;
+import org.robolectric.android.controller.ActivityController;
+
+/**
+ * Creates a {@code FlutterActivity} for use by test code that do not sit
+ * within the {@code io.flutter.embedding.android} package, and offers public
+ * access to some package private properties of {@code FlutterActivity} for
+ * testing purposes.
+ */
+public class RobolectricFlutterActivity {
+    /**
+     * Creates a {@code FlutterActivity} that is controlled by Robolectric, which
+     * otherwise can not be done in a test outside of the io.flutter.embedding.android
+     * package.
+     */
+    public static FlutterActivity createFlutterActivity(Intent intent) {
+        ActivityController<FlutterActivity> activityController = Robolectric.buildActivity(FlutterActivity.class, intent);
+        FlutterActivity flutterActivity = activityController.get();
+        flutterActivity.setDelegate(new FlutterActivityAndFragmentDelegate(flutterActivity));
+        return flutterActivity;
+    }
+
+    /**
+     * Returns a given {@code FlutterActivity}'s {@code BackgroundMode} for use by
+     * tests that do not sit in the {@code io.flutter.embedding.android} package.
+     */
+    public static FlutterActivityLaunchConfigs.BackgroundMode getBackgroundMode(FlutterActivity activity) {
+        return activity.getBackgroundMode();
+    }
+}

shell/platform/android/test/io/flutter/external/FlutterLaunchTests.java

@@ -0,0 +1,39 @@
+package io.flutter.external;
+
+import android.content.Intent;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.robolectric.RobolectricTestRunner;
+import org.robolectric.RuntimeEnvironment;
+import org.robolectric.annotation.Config;
+
+import io.flutter.embedding.android.FlutterActivity;
+import io.flutter.embedding.android.FlutterActivityLaunchConfigs.BackgroundMode;
+import io.flutter.embedding.android.FlutterView;
+import io.flutter.embedding.android.RobolectricFlutterActivity;
+
+import static org.junit.Assert.assertArrayEquals;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNull;
+import static org.junit.Assert.assertTrue;
+
+@Config(manifest=Config.NONE)
+@RunWith(RobolectricTestRunner.class)
+public class FlutterLaunchTests {
+  @Test
+  public void launchFlutterActivity_with_defaultIntent_expect_defaultConfiguration() {
+    Intent intent = FlutterActivity.createDefaultIntent(RuntimeEnvironment.application);
+    FlutterActivity flutterActivity = RobolectricFlutterActivity.createFlutterActivity(intent);
+
+    assertEquals("main", flutterActivity.getDartEntrypointFunctionName());
+    assertEquals("/", flutterActivity.getInitialRoute());
+    assertArrayEquals(new String[]{}, flutterActivity.getFlutterShellArgs().toArray());
+    assertTrue(flutterActivity.shouldAttachEngineToActivity());
+    assertNull(flutterActivity.getCachedEngineId());
+    assertTrue(flutterActivity.shouldDestroyEngineWithHost());
+    assertEquals(BackgroundMode.opaque, RobolectricFlutterActivity.getBackgroundMode(flutterActivity));
+    assertEquals(FlutterView.RenderMode.surface, flutterActivity.getRenderMode());
+    assertEquals(FlutterView.TransparencyMode.opaque, flutterActivity.getTransparencyMode());
+  }
+}

shell/platform/android/test/io/flutter/external/README.md

@@ -0,0 +1 @@
+This `external` package exists to run tests in a package other than where the code under test is defined. This is offered for tests that need to verify that app devs, with their own packages, can reference and execute APIs that Flutter intends to be public.