Access the properties of an element in an XML drawable resource - android-layout

Question

Excuse the title - not sure how to word this question.
I created a file called rectangle.xml inside res/drawable. It is an extremely basic rectangle shape, the I'm using with an ImageView within a custom listview.
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle">
<solid android:color="#FF0000" />
<corners android:radius="4dp"/>
</shape>
Using it like so:
<ImageView
android:id="#+id/row_colorRect"
android:layout_width="24dp"
android:layout_height="match_parent"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:src="#drawable/rectangle" />
I want to be able to access that rectangle's solid property so I can change its color on the fly. I can't access that property through the ImageView .. so I imagine I have to somehow dig into the children of the ImageView, find the shape, and change it that way.
How do I go about this?
Thanks!

Answer 1

Just tried it and I managed to do it.
ImageView imageView = (ImageView) findViewById(R.id.row_colorRect);
((GradientDrawable) imageView.getDrawable()).setColor(Color.RED);
Accessing the ImageView GradientDrawable, that represents your rectangle.xml resource, you can change its solid color, among other attributes.

Answer 2

Try this way,hope this will help you to solve your problem.
shape.xml (Drawable)
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle">
<solid android:color="#FF0000" />
<corners android:radius="4dp"/>
</shape>
main.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center">
<ImageView
android:id="#+id/imageView"
android:layout_width="100dp"
android:layout_height="100dp"
android:background="#drawable/shape"/>
</LinearLayout>
MyActivity.java
public class MyActivity extends Activity {
private ImageView imageView;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
imageView = (ImageView) findViewById(R.id.imageView);
imageView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
GradientDrawable sd = (GradientDrawable) imageView.getBackground().mutate();
sd.setColor(Color.parseColor("#CCC111"));
sd.invalidateSelf();
}
});
}
}