无法在android中将矢量可绘制转换为位图可绘制

我正在尝试将位图转换为字节数组，其中我将矢量可绘制图像转换为位图，然后将其转换为字节数组，但当我打开应用程序时，它显示一个错误类强制转换异常无法将矢量可绘制图像转换为位图可绘制

 Resources res = getResources();
   Drawable drawable = res.getDrawable(R.drawable.ic_motorcycle_black);
    if (drawable != null) {
        drawable.setColorFilter(0xffff0000, PorterDuff.Mode.MULTIPLY);
    }
    Bitmap bitmap = ((BitmapDrawable) drawable).getBitmap();
    ByteArrayOutputStream stream = new ByteArrayOutputStream();
    bitmap.compress(Bitmap.CompressFormat.PNG, 100, stream);
    final byte[] bike = stream.toByteArray();

错误：

  Caused by: java.lang.ClassCastException: android.graphics.drawable.VectorDrawable cannot be cast to android.graphics.drawable.BitmapDrawable
                                                                  at codingtown.coconut.otherexpense.activity.AddNewExpenseCategoryActivity.intialize(AddNewExpenseCategoryActivity.java:82)
                                                                  at codingtown.coconut.otherexpense.activity.AddNewExpenseCategoryActivity.onCreate(AddNewExpenseCategoryActivity.java:67)
                                                                  at android.app.Activity.performCreate(Activity.java:6092)
                                                                  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1112)

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无法将VectorDrawable强制转换为BitmapDrawable。他们没有亲子关系。它们都是Drawable类的直接子类

要从drawable获取位图，需要从drawable元数据创建位图

可能是另一种方法

try {
    Bitmap bitmap;

    bitmap = Bitmap.createBitmap(drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight(), BITMAP_CONFIG);

    Canvas canvas = new Canvas(bitmap);
    drawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());
    drawable.draw(canvas);
    return bitmap;
} catch (OutOfMemoryError e) {
    // Handle the error
    return null;
}

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你可以试试这个。它对我很管用

private BitmapDescriptor bitmapDescriptorFromVector(Context context, @DrawableRes  int vectorDrawableResourceId) {
    Drawable background = ContextCompat.getDrawable(context, R.drawable.ic_map_pin_filled_blue_48dp);
    background.setBounds(0, 0, background.getIntrinsicWidth(), background.getIntrinsicHeight());
    Drawable vectorDrawable = ContextCompat.getDrawable(context, vectorDrawableResourceId);
    vectorDrawable.setBounds(40, 20, vectorDrawable.getIntrinsicWidth() + 40, vectorDrawable.getIntrinsicHeight() + 20);
    Bitmap bitmap = Bitmap.createBitmap(background.getIntrinsicWidth(), background.getIntrinsicHeight(), Bitmap.Config.ARGB_8888);
    Canvas canvas = new Canvas(bitmap);
    background.draw(canvas);
    vectorDrawable.draw(canvas);
    return BitmapDescriptorFactory.fromBitmap(bitmap);
}

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至少要给原作者一些荣誉