commit 6cfe6a8d382002fc9bae18aac4d32f13d49d4324
author Luan Nguyen <luann@google.com> Tue Jun 30 12:13:48 2015 -0700
committer Luan Nguyen <luann@google.com> Tue Jun 30 14:13:14 2015 -0700
tree 28f4a4e8e6a8a22a9026351746b3355ca1a46404
parent 041e01bbdffa85b9b5ffba201d36bd566eaa2651

docs: Move scale Bitmap code to onSurfaceChanged

bug: 21099578
Change-Id: I5e8d1c6c1757ec512ff2695689bc5b8c2c88706f

docs/html/training/wearables/watch-faces/drawing.jd

diff --git a/docs/html/training/wearables/watch-faces/drawing.jd b/docs/html/training/wearables/watch-faces/drawing.jd
index 8b6de76..30a7a6f 100644
--- a/docs/html/training/wearables/watch-faces/drawing.jd
+++ b/docs/html/training/wearables/watch-faces/drawing.jd
@@ -457,9 +457,23 @@
 round devices. You can use this canvas to draw your watch face directly as follows:</p>
 
 <ol>
-<li>If this is the first invocation of the
-<a href="{@docRoot}reference/android/support/wearable/watchface/CanvasWatchFaceService.Engine.html#onDraw(android.graphics.Canvas, android.graphics.Rect)"><code>onDraw()</code></a>
-method, scale your background to fit.</li>
+<li>Override the
+<a href="{@docRoot}reference/android/support/wearable/watchface/CanvasWatchFaceService.Engine.html#onSurfaceChanged(android.view.SurfaceHolder, int, int, int)"><code>onSurfaceChanged()</code></a>
+method to scale your background to fit the device any time the view changes.
+<pre>
+&#64;Override
+public void onSurfaceChanged(
+        SurfaceHolder holder, int format, int width, int height) {
+    if (mBackgroundScaledBitmap == null
+            || mBackgroundScaledBitmap.getWidth() != width
+            || mBackgroundScaledBitmap.getHeight() != height) {
+        mBackgroundScaledBitmap = Bitmap.createScaledBitmap(mBackgroundBitmap,
+                width, height, true /* filter */);
+    }
+    super.onSurfaceChanged(holder, format, width, height);
+}
+</pre>
+</li>
 <li>Check whether the device is in ambient mode or interactive mode.</li>
 <li>Perform any required graphic computations.</li>
 <li>Draw your background bitmap on the canvas.</li>
@@ -482,13 +496,6 @@
     int width = bounds.width();
     int height = bounds.height();
 
-    // Draw the background, scaled to fit.
-    if (mBackgroundScaledBitmap == null
-        || mBackgroundScaledBitmap.getWidth() != width
-        || mBackgroundScaledBitmap.getHeight() != height) {
-        mBackgroundScaledBitmap = Bitmap.createScaledBitmap(mBackgroundBitmap,
-                                      width, height, true);
-    }
     canvas.drawBitmap(mBackgroundScaledBitmap, 0, 0, null);
 
     // Find the center. Ignore the window insets so that, on round watches