android将drawable转成bitmap,android – 如何将PictureDrawable转换为Bitmap

如何将PictureDrawable对象转换为Bitmap对象？我尝试了下面显示的以下代码,它给出了空指针.

//Convert PictureDrawable to Bitmap

private Bitmap pictureDrawable2Bitmap(PictureDrawable pictureDrawable){

Bitmap bitmap = Bitmap.createBitmap(pictureDrawable.getIntrinsicWidth(),pictureDrawable.getIntrinsicHeight(),Config.ARGB_8888);

Toast.makeText(HTMLActivity.this,"bitmap " + bitmap.toString(),Toast.LENGTH_LONG).show();

Canvas canvas = new Canvas(bitmap);

canvas.drawPicture(pictureDrawable.getPicture());

return bitmap;

}

这是一个示例,用于显示我在代码中所做的事情;

private Picture picture;

private String url;

private WebView webview;

private Bitmap HTMLBitmap;

private PictureDrawable HTMLPicDraw;

// goal is to convert WebView --> Picture --> PictureDrawable --> Bitmap

picture = webview.capturePicture();

HTMLPicDraw = new PictureDrawable(picture);

// HTMLPicDraw a PictureDrawable object is good,no null pointer exception here

// what is left is to go from PictureDrawable to Bitmap