Android 灰度可显示
要对可绘制图像进行灰度显示,我需要执行以下操作:Android 灰度可显示,android,svg,Android,Svg,要对可绘制图像进行灰度显示,我需要执行以下操作: ColorMatrix matrix = new ColorMatrix(); matrix.setSaturation(200); ColorMatrixColorFilter filter = new ColorMatrixColorFilter(matrix); drawable.setColorFilter(filter); 作为。它很好用 我正在使用svg android库。所以我试着: PictureDrawable picture
ColorMatrix matrix = new ColorMatrix();
matrix.setSaturation(200);
ColorMatrixColorFilter filter = new ColorMatrixColorFilter(matrix);
drawable.setColorFilter(filter);
作为。它很好用
我正在使用svg android库。所以我试着:
PictureDrawable pictureDrawable = svg.createPictureDrawable();
ColorMatrix matrix = new ColorMatrix();
matrix.setSaturation(200);
ColorMatrixColorFilter filter = new ColorMatrixColorFilter(matrix);
pictureDrawable.setColorFilter(filter);
imageView.setImageDrawable(pictureDrawable);
但是什么都没发生。。。怎么了?恐怕我在Android源代码中找到了原因: Drawable.java
public abstract void setColorFilter(ColorFilter cf);
@Override
public void setColorFilter(ColorFilter colorFilter) {}
picturedravable.java
public abstract void setColorFilter(ColorFilter cf);
@Override
public void setColorFilter(ColorFilter colorFilter) {}
简单地说,任何对
setColorFilter
的调用对于picturedravable
s都是无用的。恐怕我在Android源代码中找到了原因:
Drawable.java
public abstract void setColorFilter(ColorFilter cf);
@Override
public void setColorFilter(ColorFilter colorFilter) {}
picturedravable.java
public abstract void setColorFilter(ColorFilter cf);
@Override
public void setColorFilter(ColorFilter colorFilter) {}
简单地说,任何对
setColorFilter
的调用对于picturedravable
s都是无用的。我刚刚通过谷歌搜索找到了这个页面。如果有人仍然感兴趣,我将使用一些解决方法来解决相同的问题:
Picture pic = svg.getPicture();
Bitmap bm = Bitmap.createBitmap(pic.getWidth(), pic.getHeight(), Bitmap.Config.ARGB_4444);
Canvas c = new Canvas(bm);
c.drawPicture(pic, new Rect(0,0,pic.getWidth(), pic.getHeight()));
c.save();
BitmapDrawable drawable = new BitmapDrawable(getResources(), bm);
drawable.setColorFilter(getBlackAndWhiteFilter());
imageView.setImageDrawable(drawable);
不用pic.getWidth()和pic.getWidth(),你当然可以使用你喜欢的图像大小,这样位图就不会画得太大,因为那样可能会降低性能。我刚通过谷歌搜索找到了这个页面。如果有人仍然感兴趣,我将使用一些解决方法来解决相同的问题:
Picture pic = svg.getPicture();
Bitmap bm = Bitmap.createBitmap(pic.getWidth(), pic.getHeight(), Bitmap.Config.ARGB_4444);
Canvas c = new Canvas(bm);
c.drawPicture(pic, new Rect(0,0,pic.getWidth(), pic.getHeight()));
c.save();
BitmapDrawable drawable = new BitmapDrawable(getResources(), bm);
drawable.setColorFilter(getBlackAndWhiteFilter());
imageView.setImageDrawable(drawable);
不用pic.getWidth()和pic.getWidth(),您当然可以使用首选的图像大小,这样位图就不会画得太大,因为这可能会降低性能。另请参阅我的相关问题和评论中的讨论:另请参阅我的相关问题和评论中的讨论: