Round Image Drawable

HeaderRoundDrawable.java

public class HeaderRoundDrawable extends Drawable {

    private static final float ROUND_RADIUS = ScreenUtil.dip2px(AppApplication.getContext(), 6);

    private final RectF mRect = new RectF(), mBitmapRect;
    private final BitmapShader mBitmapShader;
    private final Paint mPaint;
    private Path mPath = new Path();
    private float[] mRadius;

    public HeaderRoundDrawable(Bitmap bitmap) {

        mBitmapShader = new BitmapShader(bitmap, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP);
        mBitmapRect = new RectF(0, 0, bitmap.getWidth(), bitmap.getHeight());

        mPaint = new Paint();
        mPaint.setAntiAlias(true);
        mPaint.setShader(mBitmapShader);
        mRadius = new float[]{ROUND_RADIUS, ROUND_RADIUS, ROUND_RADIUS, ROUND_RADIUS, 0, 0, 0, 0};
    }

    @Override
    protected void onBoundsChange(Rect bounds) {
        super.onBoundsChange(bounds);
        mRect.set(0, 0, bounds.width(), bounds.height());

        // Resize the original bitmap to fit the new bound
        Matrix shaderMatrix = new Matrix();
        shaderMatrix.setRectToRect(mBitmapRect, mRect, Matrix.ScaleToFit.FILL);
        mBitmapShader.setLocalMatrix(shaderMatrix);

    }

    @Override
    public void draw(Canvas canvas) {
        mPath.reset();
        mPath.addRoundRect(mRect, mRadius, Path.Direction.CCW);
        canvas.drawPath(mPath, mPaint);
    }

    @Override
    public int getOpacity() {
        return PixelFormat.TRANSLUCENT;
    }

    @Override
    public void setAlpha(int alpha) {
        mPaint.setAlpha(alpha);
    }

    @Override
    public void setColorFilter(ColorFilter cf) {
        mPaint.setColorFilter(cf);
    }
}