How to create android shape background programmatically?

You can do it like this:

public static void customView(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 });
    shape.setColor(backgroundColor);
    shape.setStroke(3, borderColor);
    v.setBackground(shape);
}

See the documentation for the meaning of setCornerRadii params.

You can use this function throughout your app and can put border and background color of your choice.

I've created a library which can help to create drawables programmatically.

See here: DrawableToolbox.

With DrawableToolbox, you can create it by:

Drawable drawable = new DrawableBuilder()
        .rectangle()
        .solidColor(0xffe67e22)
        .bottomLeftRadius(20) // in pixels
        .bottomRightRadius(20) // in pixels
//        .cornerRadii(0, 0, 20, 20) // the same as the two lines above
        .build();

If what you want is just a simple rounded rectangle, cut the long story short.

    float r=8; // the border radius in pixel
    ShapeDrawable shape = new ShapeDrawable (new RoundRectShape(new float[] { r, r, r, r, r, r, r, r },null,null));
    shape.getPaint().setColor(Color.RED);
    view.setBackground(shape);

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• What is the RoundRectShape ?

RoundRectShape specifies an outer (round) rect and an optional inner (round) rect.

// RoundRectShape constructor

   RoundRectShape(float[] outerRadii,
                     RectF inset,
                   float[] innerRadii);

• outerRadii is an array of 8 radius values, for the outer roundrect. The first two floats are for the top-left corner (remaining pairs correspond clockwise). For no rounded corners on the outer rectangle, just pass null.

For example:

• inset is a RectF that specifies the distance from the inner rect to each side of the outer rect. For no inner, pass null.

• innerRadii is an array of 8 radius values, for the inner roundrect. The first two floats are for the top-left corner (remaining pairs correspond clockwise). For no rounded corners on the inner rectangle, pass null. If inset parameter is null, this parameter is ignored.

For example:

ShapeDrawable shape = new ShapeDrawable(
        new RoundRectShape(
            new float[]{20, 20, 20, 20, 20, 20, 20, 20},
            new RectF(10, 20, 10, 20),
            new float[]{40, 40, 40, 40, 40, 40, 40, 40}));