RoundedDrawable.java

package in.srain.cube.image.drawable;

import android.graphics.*;
import android.graphics.drawable.Drawable;

/**
 * A drawable with rounded corners;
 *
 * @author http://www.liaohuqiu.net
 */
public class RoundedDrawable extends Drawable {

    protected final float mCornerRadius;
    protected final int mMargin;

    protected final RectF mRect = new RectF();
    protected final BitmapShader mBitmapShader;
    protected final Paint mPaint;

    public RoundedDrawable(Bitmap bitmap, float cornerRadius, int margin) {
        mCornerRadius = cornerRadius;
        mMargin = margin;

        mBitmapShader = new BitmapShader(bitmap, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP);

        mPaint = new Paint();
        mPaint.setAntiAlias(true);
        mPaint.setShader(mBitmapShader);
    }

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

    @Override
    public void draw(Canvas canvas) {
        canvas.drawRoundRect(mRect, mCornerRadius, mCornerRadius, 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);
    }
}