MaskedImageView.java

package oak.widget;

import android.content.Context;
import android.content.res.Resources;
import android.content.res.TypedArray;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.PorterDuff;
import android.graphics.PorterDuffXfermode;
import android.graphics.Rect;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.graphics.drawable.NinePatchDrawable;
import android.util.AttributeSet;
import android.widget.ImageView;

import oak.R;

public class MaskedImageView extends ImageView {

    private BitmapDrawable maskDrawable;
    private NinePatchDrawable maskDrawableNine;
    private BitmapDrawable overlayDrawable;
    private NinePatchDrawable overlayDrawableNine;
    private int mFillColor;
    private int shadowColor;

    public MaskedImageView(Context context) {
        super(context);
    }

    public MaskedImageView(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public MaskedImageView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);

        Resources res = getResources();
        TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.MaskedImageView);
        if (typedArray != null && res != null) {
            int fillColorResourceId = typedArray.getResourceId(R.styleable.MaskedImageView_oakFillColor, -1);
            int glareColorResourceId = typedArray.getResourceId(R.styleable.MaskedImageView_oakGlareColor, -1);
            int maskResourceId = typedArray.getResourceId(R.styleable.MaskedImageView_oakMask, -1);
            int overlayResourceId = typedArray.getResourceId(R.styleable.MaskedImageView_oakOverlay, -1);

            if (fillColorResourceId != -1) {
                setFillColor(res.getColor(fillColorResourceId));
            }
            if (glareColorResourceId != -1) {
                setGlareColor(res.getColor(glareColorResourceId));
            }
            if (maskResourceId != -1) {
                Drawable d = res.getDrawable(maskResourceId);
                if (d != null && d instanceof BitmapDrawable) {
                    setMaskDrawable((BitmapDrawable) d);
                } else if (d != null && d instanceof NinePatchDrawable) {
                    setMaskDrawable((NinePatchDrawable) d);
                }
            }
            if (overlayResourceId != -1) {
                Drawable d = res.getDrawable(overlayResourceId);
                if (d != null && d instanceof BitmapDrawable) {
                    setOverlayDrawable((BitmapDrawable) d);
                } else if (d != null && d instanceof NinePatchDrawable) {
                    setOverlayDrawable((NinePatchDrawable) d);
                }
            }
            typedArray.recycle();
        }
    }

    public void setFillColor(int color) {
        mFillColor = color;
    }

    private void setGlareColor(int color) {
        shadowColor = color;
    }

    @Override
    protected void onDraw(Canvas canvas) {
        BitmapDrawable bmDrawable = (BitmapDrawable) getDrawable();
        Rect rect = new Rect();
        getDrawingRect(rect);
        Bitmap product = Bitmap.createBitmap(rect.width(), rect.height(), Bitmap.Config.ARGB_8888);

        if (bmDrawable != null && bmDrawable.getBitmap() != null) {
            product.setDensity(bmDrawable.getBitmap().getDensity());
            Canvas c = new Canvas(product);
            c.setDensity(canvas.getDensity());
            c.drawColor(mFillColor);
            super.onDraw(c);
            if (maskDrawable != null) {
                Paint p = new Paint();
                p.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.MULTIPLY));
                c.drawBitmap(maskDrawable.getBitmap(), null, rect, p);
            } else if (maskDrawableNine != null) {
                maskDrawableNine.setBounds(rect);
                maskDrawableNine.getPaint().setXfermode(new PorterDuffXfermode(PorterDuff.Mode.MULTIPLY));
                maskDrawableNine.draw(c);
            }
            if (shadowColor != 0) {
                //draw glare
                Paint glarePaint = new Paint();
                glarePaint.setColor(shadowColor);
                glarePaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
                Path glarePath = new Path();
                glarePath.moveTo(rect.centerX() - rect.width() / 2, rect.centerY() - rect.height() / 2);
                glarePath.lineTo(rect.centerX() - rect.width() / 2, rect.centerY() + rect.height() / 2 - rect.height() / 5);
                glarePath.lineTo(rect.centerX() + rect.width() / 2, rect.centerY() - rect.height() / 2 + rect.height() / 5);
                glarePath.lineTo(rect.centerX() + rect.width() / 2, rect.centerY() - rect.height() / 2);
                c.drawPath(glarePath, glarePaint);
            }
            if (overlayDrawable != null) {
                Paint p = new Paint();
                c.drawBitmap(overlayDrawable.getBitmap(), null, rect, p);
            } else if (overlayDrawableNine != null) {
                overlayDrawableNine.setBounds(rect);
                overlayDrawableNine.draw(c);
            }
            canvas.drawBitmap(product, null, rect, new Paint());
        }
        product.recycle();
    }

    public void setMaskDrawable(BitmapDrawable bmDrawable) {
        this.maskDrawable = bmDrawable;
    }

    public void setMaskDrawable(NinePatchDrawable bmDrawable) {
        this.maskDrawableNine = bmDrawable;
    }

    public void setOverlayDrawable(BitmapDrawable bmDrawable) {
        this.overlayDrawable = bmDrawable;
    }

    public void setOverlayDrawable(NinePatchDrawable npDrawable) {
        this.overlayDrawableNine = npDrawable;
    }

    @Override
    public void setImageDrawable(Drawable drawable) {
        super.setImageDrawable(drawable);
    }

    @Override
    public void requestLayout() {
        // do nothing -- the layout changes so this optimizes things a bit
    }
}