How to set Corner in Drawable at runtime?

Question

I would like edit the background of layout in runtime. My image drawable is in the class and I would like to set the image with corners like background of the layout. How to do this?

Answer 1

1. First get the background from your view using getBackground() .
2. Cast it to a GradientDrawable variable.
3. Finally call method setCornerRadius(float value) with the value.

setCornerRadius(float value) will set all four corners with the same value.

So it also has the method setCornerRadii(float []radii), which can be used to set corners of all four sides, from top-left, top-right, bottom-right, bottom-left;

setCornerRadii(float []radii)

Specify radii for each of the 4 corners. For each corner, the array contains 2 values, [X_radius, Y_radius]. The corners are ordered top-left, top-right, bottom-right, bottom-left. This property is honored only when the shape is of type RECTANGLE.

GradientDrawable drawable = (GradientDrawable) view.getBackground();
drawable.setCornerRadii(radii);

OR

float values[] = {1.1f, 2.2f, 1.5f, 3.3f};
GradientDrawable drawable = (GradientDrawable) view.getBackground();
drawable.setCornerRadii(values);

This means, top-left corner is 1.1f, top-right corner is 2.2, bottom-right corner is 1.5f and finally bottom-left corner is 3.3f.

Answer 2

Try this:

GradientDrawable bg = (GradientDrawable) relative_layout.getBackground();
bg.setCornerRadii();

Answer 3

Create drawables resource for your normal and curved background and place them in res/drawable/ folder.

For example:

box.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">
</shape>

box_curved.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">
    <corners android:radius="5dp" />
</shape>

Then at runtime, change background by :

view.setBackground(getResources().getDrawable(R.drawable.box));

or

view.setBackground(getResources().getDrawable(R.drawable.box_curved));

Answer 4

 int sdk = android.os.Build.VERSION.SDK_INT; if(sdk < android.os.Build.VERSION_CODES.JELLY_BEAN) { setBackgroundDrawable(); } else { setBackground(); } 

see : https://stackoverflow.com/a/11947755/3329488

Answer 5

To create Shape Drawable Programetically

public static void createShapeDrawable(View v, int backgroundColor, int borderColor)
    {
        GradientDrawable shape = new GradientDrawable();
        shape.setShape(GradientDrawable.RECTANGLE);
        shape.setCornerRadii(new float[] { 8, 8, 8, 8, 0, 0, 0, 0 }); // set corner Radious 
        shape.setColor(backgroundColor);
        shape.setStroke(3, borderColor);
        v.setBackgroundDrawable(shape);
    }