java Android：如何将图像资源与 R.drawable.imagename 进行比较？
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Android: How to compare resource of an image with R.drawable.imagename?
提问by rizalp1
I am working on a sample application in which I need to get the resource of an image view in a onClick listener and compare that with the image source that I know exists. If the resources are the same, I want to launch another intent. The problem I am facing right now is to access that ImageView (and hence its resource Id integer) to compare to the drawable resource.
我正在开发一个示例应用程序，其中我需要在 onClick 侦听器中获取图像视图的资源，并将其与我知道存在的图像源进行比较。如果资源相同，我想启动另一个意图。我现在面临的问题是访问 ImageView（以及它的资源 Id 整数）以与可绘制资源进行比较。
@Override
// should int be final ??
public View getView(final int position, View convertView, ViewGroup parent) {
ImageView imageView;
if (convertView == null) { // if it's not recycled, initialize some attributes
imageView = new ImageView(mContext);
imageView.setLayoutParams(new GridView.LayoutParams(85, 85));
imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
imageView.setPadding(8, 8, 8, 8);
} else {
imageView = (ImageView) convertView;
}
imageView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// This is not working and I need to find a way to solve this >>
if (((ImageView)v).getResources().getInteger(0) == R.drawable.imageToCompare)
{
// do nothing
}
else
{
// do something
}
采纳答案by Michael
You can't get a drawable id from an ImageView. But if you set it from code, you can also store it somewhere, for example in the tag field. Take a look at the similar question: Who I compare an background Image resource TextView with a R.drawable.bg_image for switch.
你不能从ImageView. 但是如果你从代码中设置它，你也可以将它存储在某个地方，例如在标签字段中。看看类似的问题：谁我将背景图像资源 TextView 与 R.drawable.bg_image 进行比较。
回答by swat
if(((ImageView)v).getDrawable().getConstantState() == MainActivity.this
.getResources().getDrawable(R.drawable.unlock)
.getConstantState()))
{
// Do Something
}
回答by sandalone
The proper way is to user setTag()and getTag. I guess you are making your own adapter.
正确的方法是用户setTag()和getTag。我猜你正在制作自己的适配器。
In the method public View getView(int position, View convertView, ViewGroup parent), you set tag to Imageviewwhen you add other properties to it.
在方法中public View getView(int position, View convertView, ViewGroup parent)，Imageview当您向其添加其他属性时，将标记设置为。
ImageView temp = (ImageView) v.findViewById(resId);
temp.setImageResource(icon);
temp.setTag(icon); //drawable unique ID will be my identifier here
Then in the onClickyou simply compare View vwith your drawableid. For example, I wanted to change image on click and I coded it this way. Take notice how I also change tag when I set a new drawable
然后在onClick您只需View v与您的drawableid进行比较。例如，我想在单击时更改图像，并以这种方式对其进行编码。请注意我在设置新的可绘制对象时如何更改标签
img.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
if ((Integer)v.getTag() == R.drawable.current_img) {
v.setBackgroundResource(R.drawable.new_img);
v.setTag(R.drawable.new_img);
}
}
});
