Android change color stroke (border) programmatically

Question

I try change color "stroke", through "GradientDrawable" but not work.

also, I don't know how get id stroke, and change only stroke (I see google, all example are failed)

My XML item

<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >
    <item android:id="@+id/selectable_kachel_shape" >
        <shape
            android:innerRadius="0dp"
            android:shape="ring"
            android:thicknessRatio="2"
            android:useLevel="false" >
            <stroke android:width="11dp" android:color="#ff00ffff"/>
            <gradient
                android:centerColor="#FFFFFF"
                android:endColor="#FFFFFF"
                android:startColor="#FFFFFF"
                android:type="sweep" />
        </shape>
    </item>
    </layer-list>

GradientDrawable gd = (GradientDrawable) circleProgress.getBackground();

gd = (GradientDrawable) circleProgress.getBackground();
gd.setColor(Color.RED);

android.graphics.drawable.LayerDrawable cannot be cast to android.graphics.drawable.GradientDrawable

Here Works, but ... not get my item

    GradientDrawable gd = new GradientDrawable();
    gd.setColor(Color.RED);
    gd.setCornerRadius(10);
    gd.setStroke(2, Color.WHITE);


    circleProgress.setBackgroundDrawable(gd);

UPDATE here Works, BUT NOT CHANGE MY STROKE (I TRIED WITH ID BUT NOT WORK) ONLY WORK WITH ID ITEM.

GradientDrawable shape = (GradientDrawable) (layers.findDrawableByLayerId(R.id.selectable_kachel_shape));
        shape.setColor(this.getResources().getColor(android.R.color.background_dark));
        circleProgress.setBackgroundDrawable(shape);

Answer 1

Instead of this you may be use any layout and apply your xml as selector and for that layout you apply dynamic backgrounds via GradientDrawable.

For example , main.xml

           <RelativeLayout 
            android:orientation="vertical"
            android:id="@+id/mainLayout"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:background="@drawable/shapes"/>

Then your xml ,shapes.xml

            <layer-list xmlns:android="http://schemas.android.com/apk/res/android" >
                <item android:id="@+id/selectable_kachel_shape" >
                    <shape
                        android:innerRadius="0dp"
                        android:shape="ring"
                        android:thicknessRatio="2"
                        android:useLevel="false" >
                        <stroke android:width="11dp" android:color="#ff00ffff"/>
                        <gradient
                            android:centerColor="#FFFFFF"
                            android:endColor="#FFFFFF"
                            android:startColor="#FFFFFF"
                            android:type="sweep" />
                    </shape>
                </item>
                </layer-list>

And write following code in your activity.

    RelativeLayout  mainLayout= (RelativeLayout ) findViewById(R.id.mainLayout);
    GradientDrawable gd = new GradientDrawable();
    gd.setColor(Color.RED);
    gd.setCornerRadius(10);
    gd.setStroke(2, Color.WHITE);
    mainLayout.setBackgroundDrawable(gd);

For more GradientDrawable use the link http://developer.android.com/reference/android/graphics/drawable/GradientDrawable.html

Hopes this will help you.