【知識点】Bitmapの一般的な方法

public class BitmapUtil {

	

	/**

     *  SDCard 

     * @param pathName

     * @return

     */

    public static Bitmap getBitmapFromSDCard(String pathName) {

        return BitmapFactory.decodeFile(pathName);

    }

 

    /**

     *  

     * @param bitmap

     * @param width

     * @param height

     * @return

     */

    public static Bitmap zoomBitmap(Bitmap bitmap, int width, int height) {

        int w = bitmap.getWidth();

        int h = bitmap.getHeight();

        Matrix matrix = new Matrix();

        matrix.postScale((float) width / w, (float) height / h);

        return Bitmap.createBitmap(bitmap, 0, 0, w, h, matrix, true);

    }

 

    /**

     *  Drawable Bitmap

     * @param drawable

     * @return

     */

    public static Bitmap drawableToBitmap(Drawable drawable) {

        int width = drawable.getIntrinsicWidth();

        int height = drawable.getIntrinsicHeight();

        Bitmap bitmap = Bitmap.createBitmap(width, height, drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565);

        Canvas canvas = new Canvas(bitmap);

        drawable.setBounds(0, 0, width, height);

        drawable.draw(canvas);

        return bitmap;

    }

 

    /**

     *  

     * @param bitmap

     * @param roundPx

     * @return

     */

    public static Bitmap getRoundedCornerBitmap(Bitmap bitmap, float roundPx) {

        Bitmap output = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), Config.ARGB_8888);

        Canvas canvas = new Canvas(output);

        final Paint paint = new Paint();

        final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());

        final RectF rectF = new RectF(rect);

        canvas.drawRoundRect(rectF, roundPx, roundPx, paint);

        paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));

        canvas.drawBitmap(bitmap, rect, rect, paint);

        return output;

    }

 

    /**

     *  

     * @param bitmap

     * @return

     */

    public static Bitmap getReflectionImageWithOrigin(Bitmap bitmap) {

        final int reflectionGap = 4;

        int width = bitmap.getWidth();

        int height = bitmap.getHeight();

 

        Matrix matrix = new Matrix();

        matrix.preScale(1, -1);

        Bitmap reflectionImage = Bitmap.createBitmap(bitmap, 0, height/2, width, height/2, matrix, false);

        Bitmap bitmapWithReflection = Bitmap.createBitmap(width, (height + height/2), Config.ARGB_8888);

        Canvas canvas = new Canvas(bitmapWithReflection);

        canvas.drawBitmap(bitmap, 0, 0, null);

        Paint defaultPaint = new Paint();

        canvas.drawRect(0, height, width, height + reflectionGap, defaultPaint);

        canvas.drawBitmap(reflectionImage, 0, height + reflectionGap, null);

 

        Paint paint = new Paint();

        LinearGradient shader = new LinearGradient(0, bitmap.getHeight(), 0, bitmapWithReflection.getHeight() + reflectionGap, 0x70ffffff, 0x00ffffff, TileMode.CLAMP);

        paint.setShader(shader);

        paint.setXfermode(new PorterDuffXfermode(Mode.DST_IN));

        canvas.drawRect(0, height, width, bitmapWithReflection.getHeight() + reflectionGap, paint);

        return bitmapWithReflection;

    }

}