getImageResource() Android. Is this possible?
I have set an image for an ImageView
using the setImageResource(R.drawable.icon1)
.
Now my requirement is to find out what is the image that is set for an ImageView
and do some processing.
Like
if (imageView.getImageResource() == R.drawable.icon1) {
//do some processing
else if (imageView.getImageResource() == R.drawable.icon2) {
//do somethign else
else
//display
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
.
Thanks. Sana.开发者_JAVA百科
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).
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
}
You should be able to use the tag property as follows:
imageView.setImageResource(R.drawable.icon1);
imageView.setTag(Integer.valueOf(R.drawable.icon1));
// later
int drawable = (Integer) imageView.getTag();
switch(drawable) {
case R.drawable.icon1:
// do_something....
break;
case R.drawable.icon2:
// do_something....
break;
...
}
Another alternative, if possible, would be to subclass the ImageView and store the integer in an overridden setImageResource().
public class MyImageView extends ImageView {
int rememberId = -1;
@override void setImageResource(int resId){
rememberId = resId;
}
int getMyResId(){
return rememberId;
}
}
You should be able to use Bundle and set whatever properties you need.
Intent i = new Intent();
Bundle extras = new Bundle();
i.putExtra("prop", "value");
package com.widget;
import android.content.Context;
import android.util.AttributeSet;
import android.widget.ImageButton;
/**
* custom star type imagebutton that can be obtain the background image resource
* id.
*
* </p> your layout xml resource might be like the following code: <br>
* <view class="com.widget.StarButton" <br>
* android:id="@+id/starButton" <br>
* android:layout_width="wrap_content" <br>
* android:layout_height="wrap_content" <br>
* android:background="@android:color/background_light" <br>
* android:paddingTop="10dp" <br>
* android:src="@drawable/star" /> <br>
*
* @author Jeffen
*
*/
public class StarButton extends ImageButton {
private int mLastResourceId = -1;
public StarButton(Context context) {
super(context);
}
public StarButton(Context context, AttributeSet attrs) {
this(context, attrs, android.R.attr.imageButtonStyle);
}
public StarButton(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
setFocusable(true);
}
/**
* set image resource and sync image resource id.
*/
@Override
public void setImageResource(int resId) {
super.setImageResource(resId);
setImageResourceId(resId);
}
public int getImageResourceId() {
return mLastResourceId;
}
public void setImageResourceId(int resId) {
mLastResourceId = resId;
}
}
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