所谓的 Adaptive Icon，其实就是拥有前景和背景两个 Drawale 的对象，把它们依次重叠绘制出就好。
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public class IconUtil { public static Bitmap getAppIcon(PackageManager mPackageManager, String packageName) { try { Drawable drawable = mPackageManager.getApplicationIcon(packageName); if (drawable instanceof BitmapDrawable) { return ((BitmapDrawable) drawable).getBitmap(); } else if (drawable instanceof AdaptiveIconDrawable) { Drawable background = ((AdaptiveIconDrawable) drawable).getBackground(); Drawable foreground = ((AdaptiveIconDrawable) drawable).getForeground(); LayerDrawable layerDrawable = new LayerDrawable(new Drawable[2] { background, foreground }); int width = layerDrawable.getIntrinsicWidth(); int height = layerDrawable.getIntrinsicHeight(); Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888); Canvas canvas = new Canvas(bitmap); layerDrawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight()); layerDrawable.draw(canvas); return bitmap; } } catch (PackageManager.NameNotFoundException e) { e.printStackTrace(); } return null; } } |
（上面的代码其实漏了对图标轮廓/形状的处理。在 setBounds 之前，理应加入
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<span class="hljs-type"> AdaptiveIconDrawable</span> <span class="hljs-variable">adaptiveIconDrawable</span> <span class="hljs-operator">=</span> (AdaptiveIconDrawable) drawable; Path path = new Path(); adaptiveIconDrawable.getIconMask().getOutline(new Outline().getPath(path)); canvas.clipPath(path); // 裁剪 canvas 以保持透明部分 |
，更新于 2024-08-01）
不过这个方案看着专业，其实略显繁复。既然 AdaptiveIconDrawable 也是 Drawable，那大一统岂不美哉，
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@NonNull private Bitmap getBitmapFromDrawable(@NonNull Drawable drawable) { final Bitmap bitmap = Bitmap.createBitmap(drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight(), Bitmap.Config.ARGB_8888); final Canvas canvas = new Canvas(bitmap); drawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight()); drawable.draw(canvas); return bitmap; } |
不过要注意，有些 Drawable 是不会返回宽高信息的，例如纯色；另外，如果传进来的是个 BitmapDrawable，那就别再费劲画了，直接返回 getBitmap() 就好。