Java-only version of SkAR: drawing on android Canvas

Bug: skia:
Change-Id: I3b85fac93a2854d1575f71554e2a7da66e8a6a6f
Reviewed-on: https://skia-review.googlesource.com/138920
Reviewed-by: Mike Reed <reed@google.com>

1 files changed, 45 insertions, 0 deletions

diff --git a/platform_tools/android/apps/skar_java/src/main/java/com/google/ar/core/examples/java/helloskar/ARSurfaceView.java b/platform_tools/android/apps/skar_java/src/main/java/com/google/ar/core/examples/java/helloskar/ARSurfaceView.java
new file mode 100644
index 0000000000..eaa336cc9e
--- /dev/null
+++ b/platform_tools/android/apps/skar_java/src/main/java/com/google/ar/core/examples/java/helloskar/ARSurfaceView.java
@@ -0,0 +1,45 @@
+package com.google.ar.core.examples.java.helloskar;
+
+import android.content.Context;
+import android.graphics.Color;
+import android.graphics.PixelFormat;
+import android.util.AttributeSet;
+import android.view.SurfaceHolder;
+import android.view.SurfaceView;
+
+/**
+ * SurfaceView that is overlayed on top of a GLSurfaceView. All 2D drawings can be done on this
+ * surface.
+ */
+public class ARSurfaceView extends SurfaceView implements SurfaceHolder.Callback {
+
+    boolean running;
+
+    public ARSurfaceView(Context context, AttributeSet attrs) {
+        super(context, attrs);
+
+        SurfaceHolder holder = getHolder();
+        this.setBackgroundColor(Color.TRANSPARENT);
+        this.setZOrderOnTop(true);
+        holder.setFormat(PixelFormat.TRANSPARENT);
+        holder.addCallback(this);
+    }
+
+    public boolean isRunning() {
+        return running;
+    }
+
+    @Override
+    public void surfaceCreated(SurfaceHolder holder) {
+        running = true;
+    }
+
+    @Override
+    public void surfaceDestroyed(SurfaceHolder holder) {
+        running = false;
+    }
+
+    @Override
+    public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
+    }
+}