getImageResource()Android.这可能吗? [英] getImageResource() Android. Is this possible?

问题描述

我已经使用setImageResource(R.drawable.icon1)为ImageView设置了图像.

I have set an image for an ImageView using the setImageResource(R.drawable.icon1).

现在我的要求是找出为ImageView设置的图像是什么，并进行一些处理.

Now my requirement is to find out what is the image that is set for an ImageView and do some processing.

喜欢

if (imageView.getImageResource() == R.drawable.icon1) {
  //do some processing
else if (imageView.getImageResource() == R.drawable.icon2) {
  //do somethign else
else 
 //display

所以我想知道是否存在一个方法(AFAIK，它不存在)，以及它是否不该如何跟踪为ImageView设置了哪些资源.

So I would like to know if there exists a method(AFAIK, it doesn't) and if it doesn't how to keep a track of what resources have been set for an ImageView.

谢谢. 萨那.

推荐答案

您假设，因为您输入了整数，所以可以取回整数，而setImageResource()则不是这样.请参见 ImageView#setImageResource().这只是为您提供的一种便捷方法:Android在后台进行操作，正在查找Drawable资源(在大多数情况下，它是BitmapDrawable，但可以是任何类型)，然后将该资源作为位图对象(即仅图像数据-它不知道其原始资源ID"以前是什么).

You're assuming that because you put an integer in, you are able to get an integer back out, and that's not how setImageResource() works. See ImageView#setImageResource(). This is just a convenience method for you: what Android is doing behind the scenes, is looking up the Drawable resource (in most cases, it's a BitmapDrawable, but it could be any type), and then applying that resource to the ImageView as a Bitmap object (i.e., image data only -- it does not have any idea what its original "resource id" was previously).

您最好的解决方案是跟踪您使用的最后一个资源ID:

Your best solution is going to be keeping track of the last resource id you used:

imageView.setImageResource(R.drawable.image1);
this.mLastResourceId = R.drawable.image1;
// ...

// Later, when checking the resource:
if (this.mLastResourceId == R.drawable.image1) {
    // Do something
}

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