我想合并两张图片,然后保存在Android SDCard上。一张来自相机,一张来自resources文件夹。问题是我收到此错误:由:java.lang.IllegalStateException:传递给 Canvas 构造函数的不可变位图引起。谢谢。
Bitmap bottomImage = BitmapFactory.decodeResource(getResources(),R.drawable.blink);
Bitmap topImage = (Bitmap) data.getExtras().get("data");
// As described by Steve Pomeroy in a previous comment,
// use the canvas to combine them.
// Start with the first in the constructor..
Canvas comboImage = new Canvas(bottomImage);
// Then draw the second on top of that
comboImage.drawBitmap(topImage, 0f, 0f, null);
// bottomImage is now a composite of the two.
// To write the file out to the SDCard:
OutputStream os = null;
try {
os = new FileOutputStream("/sdcard/DCIM/Camera/" + "myNewFileName.png");
bottomImage.compress(CompressFormat.PNG, 50, os);
//Bitmap image.compress(CompressFormat.PNG, 50, os);
} catch(IOException e) {
Log.v("error saving","error saving");
e.printStackTrace();
}
通过简单地进行此更改设法修复它:
int w = bottomImage.getWidth();
int h = bottomImage.getHeight();
Bitmap new_image = Bitmap.createBitmap(w, h ,bottomImage.getConfig());
现在的问题是它不保存图像。你知道为什么吗?
最佳答案
This会帮助你 =)
编辑:(从链接嵌入答案)
返回可变位图的唯一静态“构造函数”是:
(Class: Bitmap) public static Bitmap createBitmap(int width, int height, boolean hasAlpha)
Returns: a mutable bitmap with the specified width and height.
因此您可以使用 getPixels/setPixels 或像这样:
Bitmap bitmapResult = bm.createBitmap(widthOfOld, heightOfOld, hasAlpha); Canvas c = new Canvas(); c.setDevice(bitmapResult); // drawXY will result on that Bitmap c.drawBitmap(bitmapOld, left, top, paint);
如何从 Bitmap 获取 drawable:通过使用扩展 Drawable 的 BitmapDrawable-Subclass,如下所示:
Bitmap myBitmap = BitmapFactory.decode(path); Drawable bd = new BitmapDrawable(myBitmap);
关于Android合并两张图片,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/6944061/