获取位图矢量从绘制 [英] Getting Bitmap from vector drawable

问题描述

在我的申请，我必须设置一个大图标的通知。
LargeIcon必须是一个位图，我可绘是矢量图像（在Android的新功能，请参阅此链接）
问题是，当我试图去code的资源是一个矢量图像，我得到一个空返回。

In my application, I have to set a large icon for a notification. LargeIcon must be a Bitmap, and my drawables are vector images (the new feature in Android, see this link) The problem is when I try to decode a resource that is a vector image, I get a null returned.

下面是code的样本：

Here is the sample of code :

if (BitmapFactory.decodeResource(arg0.getResources(), R.drawable.vector_menu_objectifs) == null)
        Log.d("ISNULL", "NULL");
    else
        Log.d("ISNULL", "NOT NULL");

在这个例子中，当我和一个正常的形象，为一为例更换PNG R.drawable.vector_menu_objectifs，结果不是空（我得到正确的位图）
是否有什么我失踪？

In this sample, when I replace R.drawable.vector_menu_objectifs with a "normal" image, a png for exemple, the result is not null (I get the correct bitmap) Is there something I'm missing?

推荐答案

您可以使用下面的方法：

You can use the following method:

@TargetApi(Build.VERSION_CODES.LOLLIPOP)
private static Bitmap getBitmap(VectorDrawable vectorDrawable) {
    Bitmap bitmap = Bitmap.createBitmap(vectorDrawable.getIntrinsicWidth(),
            vectorDrawable.getIntrinsicHeight(), Bitmap.Config.ARGB_8888);
    Canvas canvas = new Canvas(bitmap);
    vectorDrawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());
    vectorDrawable.draw(canvas);
    return bitmap;
}

我有时结合起来：

which I sometimes combine with:

private static Bitmap getBitmap(Context context, int drawableId) {
    Drawable drawable = ContextCompat.getDrawable(context, drawableId);
    if (drawable instanceof BitmapDrawable) {
        return ((BitmapDrawable) drawable).getBitmap();
    } else if (drawable instanceof VectorDrawable) {
        return getBitmap((VectorDrawable) drawable);
    } else {
        throw new IllegalArgumentException("unsupported drawable type");
    }
}

这篇关于获取位图矢量从绘制的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！