catch" RuntimeException：Canvas：试图画得太大......“ [英] catch "RuntimeException: Canvas: trying to draw too large..."

问题描述

我有一个应用程序，它将文件系统中的图像绘制到屏幕上，如下所示：

I have an application which draws an image from the file system to screen like so:

Bitmap image = BitmapFactory.decodeFile(file.getPath());
imageView.setImageBitmap(image);

如果图片非常大，我会看到此错误：

If the image is very large I see this error:

java.lang.RuntimeException: Canvas: trying to draw too large(213828900bytes) bitmap.
    at android.view.DisplayListCanvas.throwIfCannotDraw(DisplayListCanvas.java:260)
    at android.graphics.Canvas.drawBitmap(Canvas.java:1415)
    ...

堆栈无法到达我的代码。我怎么能抓到这个错误？或者是否有更合适的方法将图像绘制到 imageView ，可以避免此错误？

The stack does not reach my code. How can I catch this error? Or is there a more appropriate way to be drawing the image to the imageView that can avoid this error?

推荐答案

Bitmap的大小太大，Bitmap对象无法处理它。因此，ImageView应该有同样的问题。解决方案：在诸如paint.net之类的程序中调整图像大小，或者为位图设置固定大小并缩放它。

The Bitmap is too large in size and the Bitmap object cannot handle it. Thus, ImageView should have the same problem. Solution: resize the image either in programs such as paint.net, or set a fixed size for the bitmap and scale it.

在我走得更远之前，你的堆栈跟踪链接到位图的绘制，而不是创建对象：

Before I go further, your stacktrace links to the drawing of the bitmap, not creating the object:

在android.graphics.Canvas.drawBitmap（Canvas.java:1415）

at android.graphics.Canvas.drawBitmap(Canvas.java:1415)

因此你可以这样做：

Bitmap image = BitmapFactory.decodeFile(file.getPath());//loading the large bitmap is fine. 
int w = image.getWidth();//get width
int h = image.getHeight();//get height
int aspRat = w / h;//get aspect ratio
int W = [handle width management here...];//do whatever you want with width. Fixed, screen size, anything
int H = w * aspRat;//set the height based on width and aspect ratio

Bitmap b = Bitmap.createScaledBitmap(image, W, H, false);//scale the bitmap
imageView.setImageBitmap(b);//set the image view
image = null;//save memory on the bitmap called 'image'

或者，如此处提及，您也可以使用 Picasso

Or, as mentioned here, you can use Picasso as well

注意

当堆栈跟踪来自时，您尝试加载的映像是 213828900字节，即213mb。这可能是具有非常高分辨率的图像，因为它们的尺寸越大，它们的字节越大。

The image you attempted to load in when the stacktrace is from, is 213828900 bytes, which is 213mb. This is probably an image with very high resolution, as the bigger in size they are, the bigger in bytes they are.

图像很大，带缩放的方法可能不起作用，因为它牺牲了太多的质量。由于图像很大，毕加索可能是唯一能够在没有太大分辨率的情况下加载它的东西。

With images that big, the method with scaling may not work as it sacrifices too much of the quality. With images that big, Picasso may be the only thing that loads it in without a too big loss of resolution.

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