带BitmapRegionDecoder的Android sprite动画

Question

   @Override
protected void onDraw(Canvas canvas) {
    super.onDraw(canvas);
    try {
        if (isInited && region != null) canvas.drawBitmap(region, 0, 0, paint);
    } catch (Throwable t) {
        Timber.w(t, null);
    }
}

class AnimatePlaceholderRunnable implements Runnable {
    @Override
    public void run() {
        try {
            if (Build.VERSION.SDK_INT < 10) return;
            if (!isAnimating) return;
            if ((top + height + empty) <= maxTop) top = top + height + empty;
            else
                top = 0;
            bottom = top + height;
            src = new Rect(left, top, right, bottom);
            region = decoder.decodeRegion(src, null);
            invalidate();
            postDelayed(placeholderRunnable, 41);
        } catch (Throwable t) {
            Timber.w(t, null);
        }
    }
}

Answer 1

我曾经有过类似的问题。问题是我使用的库没有捆绑64位arm代码。Android有一个错误，它假设如果一个库捆绑了64位原生代码，那么它假设所有使用原生代码的库都有64位代码。我相信Galaxy S7是一款64位的手机。检查一下你爆炸的apk，看看是不是这样。

您可以使用Java代码加载整个sprint并从中裁剪区域。您可以在本文中找到如何做到这一点的答案。Android Devs，让你的工具栏和视图背景变得冰霜

简言之：

Matrix matrix = new Matrix();
//half the size of the cropped bitmap
//to increase performance, it will also
//increase the blur effect.
matrix.setScale(0.5f, 0.5f);
Bitmap bitmap = Bitmap.createBitmap(spriteBitmap,
    (int) targetView.getX(), //start x
    (int) targetView.getY(), //start y
    targetView.getMeasuredWidth(), //end x
    targetView.getMeasureHeight(), //end y
    matrix,
    true);