ColorExtractionService.java 文件源码

@TargetApi(Build.VERSION_CODES.N)
private Palette getStatusBarPalette() {
    WallpaperManager wallpaperManager = WallpaperManager.getInstance(this);
    int statusBarHeight = getResources()
            .getDimensionPixelSize(R.dimen.status_bar_height);

    if (AndroidVersion.isAtLeastNougat) {
        try (ParcelFileDescriptor fd = wallpaperManager
                .getWallpaperFile(WallpaperManager.FLAG_SYSTEM)) {
            BitmapRegionDecoder decoder = BitmapRegionDecoder
                    .newInstance(fd.getFileDescriptor(), false);
            Rect decodeRegion = new Rect(0, 0,
                    decoder.getWidth(), statusBarHeight);
            Bitmap bitmap = decoder.decodeRegion(decodeRegion, null);
            decoder.recycle();
            if (bitmap != null) {
                return Palette.from(bitmap).clearFilters().generate();
            }
        } catch (IOException | NullPointerException e) {
            e.printStackTrace();
        }
    }

    Bitmap wallpaper = ((BitmapDrawable) wallpaperManager.getDrawable()).getBitmap();
    return Palette.from(wallpaper)
            .setRegion(0, 0, wallpaper.getWidth(), statusBarHeight)
            .clearFilters()
            .generate();
}