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I have this xml where I already set stroke color but I sometimes I want to change stoke color programmatically. The file name is dummy.xml
<?xml version="1.0" encoding="UTF-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
<solid android:color="#ffffffff" />
<stroke
android:width="1dp"
android:color="#ff000000" />
<padding
android:bottom="1dp"
android:left="1dp"
android:right="1dp"
android:top="1dp" />
<corners
android:bottomLeftRadius="7dp"
android:bottomRightRadius="7dp"
android:topLeftRadius="7dp"
android:topRightRadius="7dp" />
</shape>
I want to change color (stroke color) programmatically, how I can do this?
I use this xml here :
<LinearLayout
android:layout_marginTop="2dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/a"
android:layout_gravity="center"
android:background="#drawable/dummy"
android:layout_marginBottom="2sp"
android:orientation="horizontal"
android:padding="5dp">
<RelativeLayout
android:id="#+id/serverStatusWrapper"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="2dp"
android:background="#drawable/shadow_green"
android:padding="2dp">
<ImageView
android:id="#+id/serverStatus"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:antialias="true"
android:src="#drawable/ic_settings_input_antenna_white_24dp" />
</RelativeLayout>
<RelativeLayout
android:id="#+id/locationStatusWrapper"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#drawable/shadow_red"
android:padding="2dp">
<ImageView
android:id="#+id/locationStatus"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:antialias="true"
android:src="#drawable/ic_warning_white_24dp" />
</RelativeLayout>
</LinearLayout>

LinearLayout linearLayout = (LinearLayout) findViewById(R.id.a);
You can change the stroke as
GradientDrawable drawable = (GradientDrawable)linearLayout.getBackground();
drawable.setStroke(3, Color.RED);
And can change solid color as
GradientDrawable drawable = (GradientDrawable)linearLayout.getBackground();
drawable.setColor(Color.RED);
Hope this helps

If you have drawable file for a "view" like this
Then you can change
a. Stroke color :
GradientDrawable drawable = (GradientDrawable)view.getBackground();
drawable.setStroke(3, Color.RED); // set stroke width and stroke color
b. Solid color :
GradientDrawable drawable = (GradientDrawable)view.getBackground();
drawable.setColor(Color.RED); // set solid color
If you have drawable file for a "view" like this
Then you can change the individual item attributes by taking separate drawable objects by there positions.
StateListDrawable drawable = (StateListDrawable)view.getBackground();
DrawableContainerState dcs = (DrawableContainerState)drawable.getConstantState();
Drawable[] drawableItems = dcs.getChildren();
GradientDrawable gradientDrawableChecked = (GradientDrawable)drawableItems[0]; // item 1
GradientDrawable gradientDrawableUnChecked = (GradientDrawable)drawableItems[1]; // item 2
now to change stroke or solid color :
//solid color
gradientDrawableChecked.setColor(Color.BLUE);
gradientDrawableUnChecked.setColor(Color.RED);
//stroke
gradientDrawableChecked.setStroke(1, Color.RED);
gradientDrawableUnChecked.setStroke(1, Color.BLUE);