[UI] android.app.NativeActivity > WindowedAppActivity + code style

android/android_studio_project/app/src/main/AndroidManifest.xml

@@ -2,12 +2,23 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="jp.xenia.emulator">
 
-    <uses-feature android:name="android.hardware.vulkan.level" android:version="0" android:required="true" />
-    <uses-feature android:name="android.hardware.vulkan.version" android:version="0x400000" android:required="true" />
-    <!-- Granted automatically - guest sockets -->
+    <uses-feature
+        android:name="android.hardware.vulkan.level"
+        android:required="true"
+        android:version="0" />
+
+    <uses-feature
+        android:name="android.hardware.vulkan.version"
+        android:required="true"
+        android:version="0x400000" />
+
+    <!-- Granted automatically - guest sockets. -->
     <uses-permission android:name="android.permission.INTERNET" />
-    <!-- Needs to be requested - loading games from outside the app data directory -->
-    <!-- WRITE_EXTERNAL_STORAGE is not required to write to the external app data directory since API 19 -->
+
+    <!--
+    Needs to be requested - loading games from outside the app data directory.
+    WRITE_EXTERNAL_STORAGE is not required to write to the external app data directory since API 19.
+    -->
     <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
 
     <application
@@ -17,12 +28,14 @@
         android:roundIcon="@mipmap/ic_launcher_round"
         android:supportsRtl="true"
         android:theme="@android:style/Theme.Material.Light">
-        <activity android:name="jp.xenia.emulator.DemoActivity">
+
+        <activity android:name="jp.xenia.emulator.WindowDemoActivity">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
         </activity>
+
     </application>
 
 </manifest>

android/android_studio_project/app/src/main/java/jp/xenia/emulator/DemoActivity.java

@@ -1,12 +0,0 @@
-package jp.xenia.emulator;
-
-import android.app.Activity;
-import android.os.Bundle;
-
-public class DemoActivity extends Activity {
-    @Override
-    protected void onCreate(Bundle savedInstanceState) {
-        super.onCreate(savedInstanceState);
-        setContentView(R.layout.activity_demo);
-    }
-}

android/android_studio_project/app/src/main/java/jp/xenia/emulator/WindowDemoActivity.java

@@ -0,0 +1,8 @@
+package jp.xenia.emulator;
+
+public class WindowDemoActivity extends WindowedAppActivity {
+    @Override
+    protected String getWindowedAppIdentifier() {
+        return "xenia_ui_window_vulkan_demo";
+    }
+}

android/android_studio_project/app/src/main/java/jp/xenia/emulator/WindowedAppActivity.java

@@ -0,0 +1,45 @@
+package jp.xenia.emulator;
+
+import android.app.Activity;
+import android.content.res.AssetManager;
+import android.os.Bundle;
+import android.util.Log;
+
+public abstract class WindowedAppActivity extends Activity {
+    private static final String TAG = "WindowedAppActivity";
+
+    static {
+        // TODO(Triang3l): Move all demos to libxenia.so.
+        System.loadLibrary("xenia-ui-window-vulkan-demo");
+    }
+
+    private long mAppContext;
+
+    private native long initializeWindowedAppOnCreateNative(
+            String windowedAppIdentifier, AssetManager assetManager);
+
+    private native void onDestroyNative(long appContext);
+
+    protected abstract String getWindowedAppIdentifier();
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+
+        mAppContext = initializeWindowedAppOnCreateNative(getWindowedAppIdentifier(), getAssets());
+        if (mAppContext == 0) {
+            Log.e(TAG, "Error initializing the windowed app");
+            finish();
+            return;
+        }
+    }
+
+    @Override
+    protected void onDestroy() {
+        if (mAppContext != 0) {
+            onDestroyNative(mAppContext);
+        }
+        mAppContext = 0;
+        super.onDestroy();
+    }
+}

android/android_studio_project/app/src/main/res/layout/activity_window_demo.xml

@@ -3,6 +3,6 @@
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
-    tools:context="jp.xenia.emulator.DemoActivity">
+    tools:context="jp.xenia.emulator.WindowDemoActivity">
 
 </RelativeLayout>