Android Wear Watchface背景不会居中

Question

我正在制作一个Android表盘，我注意到无论我做什么，我的背景图像都不会完全居中。这是在模拟器和LG G Watch上测试的，具有相同的效果。

 @Override
    public void onDraw(Canvas canvas, Rect bounds) {
        int width = bounds.width();
        int height = bounds.height();
        float mCenterX = width / 2f;
        float mCenterY = height / 2f;
        if (isInAmbientMode()) {
            canvas.drawColor(Color.BLACK);
        } else {
            canvas.drawBitmap(mBackgroundBitmap, mCenterX, mCenterY, null);
        }

 @Override
    public void onApplyWindowInsets(WindowInsets insets) {
        super.onApplyWindowInsets(insets);

        // Load resources that have alternate values for round watches.
        Resources resources = FaceJake.this.getResources();
        boolean isRound = insets.isRound();
        mXOffset = resources.getDimension(isRound
                ? R.dimen.digital_x_offset_round : R.dimen.digital_x_offset);
        float textSize = resources.getDimension(isRound
                ? R.dimen.digital_text_size_round : R.dimen.digital_text_size);


 public void onCreate(SurfaceHolder holder) {
        super.onCreate(holder);

        setWatchFaceStyle(new WatchFaceStyle.Builder(FaceJake.this)
                .setCardPeekMode(WatchFaceStyle.PEEK_MODE_VARIABLE)
                .setBackgroundVisibility(WatchFaceStyle.BACKGROUND_VISIBILITY_INTERRUPTIVE)
                .setShowSystemUiTime(false)
                .setAcceptsTapEvents(true)
                .build());
        Resources resources = FaceJake.this.getResources();

        mYOffset = resources.getDimension(R.dimen.digital_y_offset);
        Drawable backgroundDrawable = resources.getDrawable(R.drawable.jakehappy);
        mBackgroundBitmap = ((BitmapDrawable) backgroundDrawable).getBitmap();
        mTextPaint = new Paint();
        mTextPaint = createTextPaint(resources.getColor(R.color.digital_text));
        mTime = new Time();

背景图片是320x320，没有此代码，它也没有居中。我甚至尝试通过中心X和Y浮动将值更改为许多不同的值，甚至100f，但这并没有帮助。  （左图：截图。右：图像为背景）