问题描述
在我的应用程序扩展了ImageView的和重写它的onDraw()方法。我使用的是彩色滤光片操纵位图添加像倒置,灰度ETCC一定的影响。绘制位图后,我试图挽救它,但我只能够保存原始位没有增加的影响。下面是的onDraw(在code)及保存方法:结果
In my application I extended the ImageView and overriden its onDraw() method. I am using a color filter to manipulate the bitmap for adding some effects like invert, grayscale etcc. After drawing the bitmap I am trying to save it but I am only able to save the original bitmap with no added effects. Here is the code for onDraw() and save method:
protected void onDraw(Canvas canvas)
{
Paint paint = mPaint;
//cmf is the color matrix filter
paint.setColorFilter(cmf);
if(mBitmap != null)
{
canvas.drawBitmap(mBitmap, offsetW, offsetH, paint);
}
}
code保存位图:结果
code for saving the bitmap:
try
{
FileOutputStream fout = new FileOutputStream(path);
mBitmap.compress(CompressFormat.JPEG, 100, fout);
} catch (FileNotFoundException e)
{
e.printStackTrace();
}
我是不是做错了什么?任何帮助将AP pretiated。
Am I doing something wrong? Any help will be appretiated.
推荐答案
您的画显示的画布上,原始位不被改变。您应该创建一个新的位图和油漆就可以了。当彩色矩阵过滤器的更换做到这一点:
You are painting on the canvas that is displayed, original bitmap is not changed. You should create a new bitmap and paint on it. When color matrix filter changes do this:
Bitmap tmp = Bitmap.createBitmap(mBitmap.getWidth(), mBitmap.getHeight(), mBitmap.getConfig())
Canvas canvas = new Canvas(tmp)
cnvas.drawBitmap(tmp, 0, 0, paint);
然后,您可以使用此TMP位图绘制并保存它。
Then, you can use this tmp bitmap to draw it and save it.
而不是使用自定义的的ImageView
使用正常的,并设置其形象到这个新位图:
Instead of using customized ImageView
use a normal one and set its image to this new bitmap:
imageView.setImageBitmap(tmp)
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