Add rotary reference app

This CL contains the base structure for the app. Rotary demo does not
work yet because FocusArea is not available yet.

Bug: 153470636
Test: make and install
Change-Id: I22ff278fff9ee280cf7f7e040b574ada1b79689a

3 files changed, 164 insertions, 0 deletions

diff --git a/RotaryPlayground/src/com/android/car/rotaryplayground/RotaryActivity.java b/RotaryPlayground/src/com/android/car/rotaryplayground/RotaryActivity.java
new file mode 100644
index 0000000..1b44ac6
--- /dev/null
+++ b/RotaryPlayground/src/com/android/car/rotaryplayground/RotaryActivity.java
@@ -0,0 +1,65 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.android.car.rotaryplayground;
+
+import android.os.Bundle;
+import androidx.fragment.app.Fragment;
+import androidx.fragment.app.FragmentActivity;
+import android.text.Html;
+import android.text.Spanned;
+import android.util.Log;
+import android.view.View;
+import android.widget.Toast;
+
+/**
+ * The main activity for Rotary Playground
+ *
+ * This activity starts the menu fragment and handles event calls (e.g. android:onClick) from
+ * elements in fragments.
+ */
+public class RotaryActivity extends FragmentActivity {
+
+    private static final String TAG = "RotaryActivity";
+    private static final String MESSAGE = "Hello there!";
+
+    private Fragment mMenuFragment = null;
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.rotary_activity);
+        showMenuFragment();
+    }
+
+    /** Event handler for buttons in res/layout/rotary_cards.xml */
+    public void onRotaryCardsButtonClick(View v) {
+        showToast(MESSAGE);
+    }
+
+    private void showMenuFragment() {
+        if (mMenuFragment == null) {
+            mMenuFragment = new RotaryMenu();
+        }
+        getSupportFragmentManager().beginTransaction()
+                .replace(R.id.rotary_menu, mMenuFragment)
+                .commit();
+    }
+
+    private void showToast(String message) {
+        Log.d(TAG, "showToast -> " + message);
+        Toast.makeText(this, message, Toast.LENGTH_SHORT).show();
+    }
+}
\ No newline at end of file
diff --git a/RotaryPlayground/src/com/android/car/rotaryplayground/RotaryCards.java b/RotaryPlayground/src/com/android/car/rotaryplayground/RotaryCards.java
new file mode 100644
index 0000000..28f34a1
--- /dev/null
+++ b/RotaryPlayground/src/com/android/car/rotaryplayground/RotaryCards.java
@@ -0,0 +1,35 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.car.rotaryplayground;
+
+import android.os.Bundle;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import androidx.annotation.Nullable;
+import androidx.fragment.app.Fragment;
+
+/** Fragment to demo a layout with cards that are FocusArea containers. */
+public class RotaryCards extends Fragment {
+
+    @Override
+    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container,
+            @Nullable Bundle savedInstanceState) {
+        View view = inflater.inflate(R.layout.rotary_cards, container, false);
+        return view;
+    }
+}
diff --git a/RotaryPlayground/src/com/android/car/rotaryplayground/RotaryMenu.java b/RotaryPlayground/src/com/android/car/rotaryplayground/RotaryMenu.java
new file mode 100644
index 0000000..272317d
--- /dev/null
+++ b/RotaryPlayground/src/com/android/car/rotaryplayground/RotaryMenu.java
@@ -0,0 +1,64 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.android.car.rotaryplayground;
+
+import android.os.Bundle;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.Button;
+import androidx.annotation.Nullable;
+import androidx.fragment.app.Fragment;
+
+/**
+ * Fragment for the menu.
+ *
+ * On focus of a menu item, the associated fragment will start in the R.id.rotary_content container.
+ */
+public class RotaryMenu extends Fragment {
+
+    private Fragment mRotaryCards = null;
+
+    private Button mCardExamplesButton;
+
+    @Override
+    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container,
+            @Nullable Bundle savedInstanceState) {
+        View view = inflater.inflate(R.layout.rotary_menu, container, false);
+
+        mCardExamplesButton = view.findViewById(R.id.cards_example);
+        mCardExamplesButton.setOnFocusChangeListener((v, hasFocus) -> showRotaryCards(hasFocus));
+        mCardExamplesButton.setOnClickListener(v -> showRotaryCards(/* hasFocus= */ true));
+
+        return view;
+    }
+
+    private void showRotaryCards(boolean hasFocus) {
+        if (!hasFocus) {
+            return; // do nothing if no focus.
+        }
+        if (mRotaryCards == null) {
+            mRotaryCards = new RotaryCards();
+        }
+        showContent(mRotaryCards);
+    }
+
+    private void showContent(Fragment fragment) {
+        getFragmentManager().beginTransaction()
+                .replace(R.id.rotary_content, fragment)
+                .commit();
+    }
+}