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安卓 imageview资源图片ID获取方法

2016-10-17 10:44 417 查看


img.setImageResource(R.drawable.a2);
img.setTag(R.drawable.a2);

this.img.getTag()

来自http://stackoverflow.com/questions/4526585/imageview-drawable-id-in-android


imageview
drawable id in android

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i had taken one imageview and set a drawable on it. Now i need to get id of drawable onclick event of imageview dynamicaly. How can i get it? anyone who already messes with it and have a solution pls help me.



android imageview
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asked Dec 24 '10 at 13:26





chirag shah
4,51042135

 
 
Paste your code, please. –  Cristian Dec
24 '10 at 13:53
 
what have you tried so far ? have you tried by yourself, or directly run here for the solution? –  Paresh
MayaniDec
24 '10 at 15:31
 
imgtopcolor=(ImageView)findViewById(R.id.topcolor); imgtopcolor.setImageResource(R.drawable.dr); now ontouchevent of
imgtopcolor i want to need drawable id .bcoz i am setting different drawable each time and want to compare the drawable with other. –  chirag
shah Dec
25 '10 at 3:06
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4 Answers

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I think if I understand correctly this is what you are doing.
ImageView view = (ImageView) findViewById(R.id.someImage);
view.setOnClickListener(new OnClickListener() {
public void onClick(View view) {
ImageView imageView = (ImageView) view;
assert(R.id.someImage == imageView.getId());
switch(getDrawableId(imageView)) {
case R.drawable.foo:
imageView.setDrawableResource(R.drawable.bar);
break;
case R.drawable.bar:
default:
imageView.setDrawableResource(R.drawable.foo);

break;
}
});


Right? So that function getDrawableId() doesn't exist. You can't get a the id that a drawable was instantiated from because the id is just a reference to the location of data on the device on how to construct a drawable. Once the drawable is constructed it
doesn't have a way to get back the resourceId that was used to create it. But you could make it work something like this:
ImageView view = (ImageView) findViewById(R.id.someImage);
view.setOnClickListener(new OnClickListener() {
public void onClick(View view) {
ImageView imageView = (ImageView) view;
assert(R.id.someImage == imageView.getId());
Integer integer = (Integer) imageView.getTag();
integer = integer == null ? 0 : integer;
switch(integer) {
case R.drawable.foo:
imageView.setDrawableResource(R.drawable.bar);
imageView.setTag(R.drawable.bar);
break;
case R.drawable.bar:
default:
imageView.setDrawableResource(R.drawable.foo);
imageView.setTag(R.drawable.foo);
break;
}
});


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edited Dec
25 '10 at 6:02

answered Dec 25 '10 at 3:52




Greg Giacovelli
6,39322453

 
 
Thanks for reply.but i think there is no such method like getDrawableID(). –  chirag
shah Dec
25 '10 at 5:21
 
That's what I said. Please read the whole solution. –  Greg
Giacovelli Dec
25 '10 at 5:47
 
Thanks for reply.i think it will work for me –  chirag
shah Dec
27 '10 at 9:29
 
did it work for you? –  Greg
Giacovelli Dec
28 '10 at 8:53
 
ya sure but i have to than convert the tag object into integer to get tag.and my job is done –  chirag
shah Jan
1 '11 at 5:12 
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I answered something like this in another question already, but will change it just a little for this one.

Unfortunately, there is no 
getImageResource()
 or 
getDrawableId()
.
But, I created a simple workaround by using the ImageView tags.

In onCreate():
imageView0 = (ImageView) findViewById(R.id.imageView0);
imageView1 = (ImageView) findViewById(R.id.imageView1);
imageView2 = (ImageView) findViewById(R.id.imageView2);

imageView0.setTag(R.drawable.apple);
imageView1.setTag(R.drawable.banana);
imageView2.setTag(R.drawable.cereal);


Then, if you like, you can create a simple function to get the drawable id:
private int getDrawableId(ImageView iv) {
return (Integer) iv.getTag();
}


Too easy.

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