StreamDrawable.java

package com.cellasoft.univrapp.utils;

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

public class StreamDrawable extends Drawable {
    private static final boolean USE_VIGNETTE = true;

    private final float mCornerRadius;
    private final RectF mRect = new RectF();
    private final BitmapShader mBitmapShader;
    private final Paint mPaint;
    private final int mMargin;

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

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

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

        mMargin = margin;
    }

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

        if (USE_VIGNETTE) {
            RadialGradient vignette = new RadialGradient(mRect.centerX(),
                    mRect.centerY() * 1.0f / 0.7f, mRect.centerX() * 1.8f,
                    new int[]{0, 0, 0x7f000000}, new float[]{0.0f, 0.7f,
                    1.0f}, Shader.TileMode.CLAMP);

            Matrix oval = new Matrix();
            oval.setScale(1.0f, 0.7f);
            vignette.setLocalMatrix(oval);

            mPaint.setShader(new ComposeShader(mBitmapShader, vignette,
                    PorterDuff.Mode.SRC_OVER));
        }
    }

    @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);
    }
}