android : Add NanovgSampleActivity.

build/android/app/src/main/java/com/facebook/igl/sample/NanovgSampleActivity.java

@@ -0,0 +1,91 @@
+/*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+// @fb-only
+
+package com.facebook.igl.shell;
+
+import android.app.Activity;
+import android.content.Context;
+import android.content.SharedPreferences;
+import android.graphics.Color;
+import android.os.Bundle;
+import android.util.Log;
+import android.view.Gravity;
+import android.view.SurfaceView;
+import android.view.View;
+import android.widget.FrameLayout;
+import android.widget.LinearLayout;
+import android.widget.TextView;
+
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.InputStream;
+
+public class NanovgSampleActivity extends SampleActivity implements View.OnClickListener {
+  private static  String TAG = "NanovgSampleActivity";
+
+  @Override
+  protected void onCreate(Bundle icicle) {
+    mEnableStencilBuffer = true;
+
+    super.onCreate(icicle);
+
+    boolean hasCopy = getSharedPreferences("data", Context.MODE_PRIVATE).getBoolean("HasCopyAssets", false);
+
+    if (!hasCopy) {
+      copyAssetsDirToSDCard(this, "", getFilesDir().getAbsolutePath());
+
+      SharedPreferences.Editor editor = getSharedPreferences("data", Context.MODE_PRIVATE).edit();
+      editor.putBoolean("HasCopyAssets",true);
+      editor.commit();
+    }
+  }
+
+  public static void copyAssetsDirToSDCard(Context context, String assetsDirName, String sdCardPath) {
+    Log.d(TAG, "copyAssetsDirToSDCard() called with: context = [" + context + "], assetsDirName = [" + assetsDirName + "], sdCardPath = [" + sdCardPath + "]");
+    try {
+      String list[] = context.getAssets().list(assetsDirName);
+      if (list.length == 0) {
+        InputStream inputStream = context.getAssets().open(assetsDirName);
+        byte[] mByte = new byte[1024];
+        int bt = 0;
+        File file = new File(sdCardPath + File.separator
+                + assetsDirName);
+        if (!file.exists()) {
+          file.createNewFile();
+        } else {
+          return;
+        }
+        FileOutputStream fos = new FileOutputStream(file);
+        while ((bt = inputStream.read(mByte)) != -1) {
+          fos.write(mByte, 0, bt);
+        }
+        fos.flush();
+        inputStream.close();
+        fos.close();
+      } else {
+        String subDirName = assetsDirName;
+        if (assetsDirName.contains("/")) {
+          subDirName = assetsDirName.substring(assetsDirName.lastIndexOf('/') + 1);
+        }
+        sdCardPath = sdCardPath + File.separator + subDirName;
+        File file = new File(sdCardPath);
+        if (!file.exists())
+          file.mkdirs();
+        for (String s : list) {
+          String fileName = assetsDirName.length() > 0 ?  assetsDirName + File.separator + s : s;
+          copyAssetsDirToSDCard(context, fileName , sdCardPath);
+        }
+      }
+    } catch (
+            Exception e) {
+      e.printStackTrace();
+    }
+  }
+
+}

build/android/app/src/main/java/com/facebook/igl/sample/SampleActivity.java

@@ -33,6 +33,8 @@ public class SampleActivity extends Activity implements View.OnClickListener {
   private final int selectedTabColor = Color.BLUE;
   private final int unSelectedTabColor = Color.GRAY;
 
+  protected boolean mEnableStencilBuffer = false;
+
   @Override
   protected void onCreate(Bundle icicle) {
     super.onCreate(icicle);
@@ -69,7 +71,7 @@ protected void onCreate(Bundle icicle) {
       } else if (mConfigs[i].version.flavor == SampleLib.BackendFlavor.OpenGL_ES) {
         backendView =
             new SampleView(
-                getApplication(), mConfigs[i].version, mConfigs[i].swapchainColorTextureFormat);
+                getApplication(), mConfigs[i].version, mConfigs[i].swapchainColorTextureFormat, mEnableStencilBuffer);
         ((SampleView) backendView).onPause();
       }
 

build/android/nanovg/AndroidManifest.xml

@@ -0,0 +1,27 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools">
+
+    <application
+        android:allowBackup="true"
+        android:dataExtractionRules="@xml/data_extraction_rules"
+        android:fullBackupContent="@xml/backup_rules"
+        android:icon="@mipmap/ic_launcher"
+        android:label="IGLNanovg"
+        android:roundIcon="@mipmap/ic_launcher_round"
+        android:supportsRtl="true"
+        android:theme="@style/Theme.IGL"
+        tools:targetApi="33">
+        <activity
+            android:name=".NanovgSampleActivity"
+            android:configChanges="orientation|screenSize"
+            android:exported="true">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+
+</manifest>

build/android/nanovg/build.gradle

@@ -51,7 +51,7 @@ android {
 
     sourceSets {
         main {
-            manifest.srcFile '../app/src/main/AndroidManifest.xml'
+            manifest.srcFile 'AndroidManifest.xml'
             res.srcDir '../app/src/main/res/'
 
             java.srcDir 'java'