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问题描述
This has me baffled. I need to copy the Bitmap from one ImageView into another. I do not want to simply copy one ImageView to another because I need to do some changes to the bitmap on its way over.
Here is some code that doesn't work.
ImageView ivSrc = (ImageView) findViewById(R.id.photo);
ivSrc.setDrawingCacheEnabled(true);
Bitmap bmSrc1 = ivSrc.getDrawingCache(); // will cause nullPointerException
Bitmap bmSrc2 = Bitmap.createBitmap(ivSrc.getDrawingCache());//bmSrc2 will be null
View vSrc = (View) ivSrc.getParent();
vSrc.setDrawingCacheEnabled(true);
Bitmap bmSrc3 = Bitmap.createBitmap(vSrc.getDrawingCache()); //black bitmap
//To test the bitmaps:
ImageView ivDest = (ImageView) findViewById(R.id.photo2);
ivDest.setImageBitmap(bmSrc1); //bmSrc1, 2, 3 results shown above
I have to going about this wrong because doing a copy should be so easy. TIA
解决方案
Not used the drawing cache, but wouldn't you need to call buildDrawingCache() ?
The way I'd do it:
Bitmap bmSrc1 = ((BitmapDrawable)ivSrc.getDrawable()).getBitmap();
Bitmap bmSrc2 = bmSrc1.copy(bmSrc1.getConfig(), true);
Note that bmSrc2 is mutable, i.e. you can stick it in a Canvas and do whatever you like with it before drawing it somewhere.
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