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Merge "docs: Move scale Bitmap code to onSurfaceChanged" into mnc-preview-docs

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This commit is contained in:
Luan Nguyen
2015-06-30 21:53:15 +00:00
committed by Android (Google) Code Review
parent 3de121f94c 6cfe6a8d38
commit ed053477d0
1 changed files with 17 additions and 10 deletions
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27
docs/html/training/wearables/watch-faces/drawing.jd
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@@ -457,9 +457,23 @@ watch face. The bounds take into account any inset areas, such as the "chin" on
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 @@ public void onDraw(Canvas canvas, Rect bounds) {
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