Android 自定义设置图片模糊度、高斯模糊效果

最近项目中有需要到“毛玻璃”效果，网上找一下，千篇一律。高谈阔论扯淡的多，真正有用的没几个！

借助此文，做修改之后，实现效果！我只是个搬运工，在此表示感谢！

http://gqdy365.iteye.com/blog/2193913

点击打开链接

淡不多扯，直接上代码：

MainActivity:

public class MainActivity extends Activity {    private ImageView old_image, blur_image;    private Bitmap mBitmap, overlay;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        init();        setView();        setModel();    }    /**     * @return 返回值：     * @作者：Gxy     * @creat on 2016/1/16 14:24     * @用途：初始化组件     * @params 参数说明：     */    private void init() {        old_image = (ImageView) findViewById(R.id.old_image);        blur_image = (ImageView) findViewById(R.id.blur_image);    }    /**     * @return 返回值：     * @作者：Gxy     * @creat on 2016/1/16 14:19     * @用途：设置模糊图片的长和宽     * @params 参数说明：     */    private void setView() {        ViewGroup.LayoutParams params = blur_image.getLayoutParams();        params.height = 600;        params.width = ViewGroup.LayoutParams.MATCH_PARENT;        blur_image.setLayoutParams(params);    }    /**     * @return 返回值：     * @作者：Gxy     * @creat on 2016/1/16 14:27     * @用途： 通过计算，然后模糊图片，网上搜的，看不明白！     * @params 参数说明：     */    private void setModel() {        if (null != overlay) {            blur_image.setImageBitmap(overlay);        }        //将old_image对象转化为bitmap对象        old_image.buildDrawingCache();        mBitmap = old_image.getDrawingCache();        mBitmap = ((BitmapDrawable) old_image.getDrawable()).getBitmap();        //下面这两个数字是控制模糊度的，可以自定义，测试了1-15之间的数字，自己感觉合适就行！        float scaleFactor =6;        float radius = 6;        int width = mBitmap.getWidth();        int height = mBitmap.getHeight();        overlay = Bitmap.createBitmap((int) (width / scaleFactor), (int) (height / scaleFactor), Bitmap.Config.ARGB_8888);        Canvas canvas = new Canvas(overlay);        canvas.scale(1 / scaleFactor, 1 / scaleFactor);        Paint paint = new Paint();        paint.setFlags(Paint.FILTER_BITMAP_FLAG);        canvas.drawBitmap(mBitmap, 0, 0, paint);        overlay = FastBlur.doBlur(overlay, (int) radius, true);        blur_image.setImageBitmap(overlay);    }}

下面这个类是计算方法，直接用的，不是吾等暂时能搞明白的！

FastBlur：

public class FastBlur {    public static Bitmap doBlur(Bitmap sentBitmap, int radius,                                boolean canReuseInBitmap) {        Bitmap bitmap;        if (canReuseInBitmap) {            bitmap = sentBitmap;        } else {            bitmap = sentBitmap.copy(sentBitmap.getConfig(), true);        }        if (radius < 1) {            return (null);        }        int w = bitmap.getWidth();        int h = bitmap.getHeight();        int[] pix = new int[w * h];        bitmap.getPixels(pix, 0, w, 0, 0, w, h);        int wm = w - 1;        int hm = h - 1;        int wh = w * h;        int div = radius + radius + 1;        int r[] = new int[wh];        int g[] = new int[wh];        int b[] = new int[wh];        int rsum, gsum, bsum, x, y, i, p, yp, yi, yw;        int vmin[] = new int[Math.max(w, h)];        int divsum = (div + 1) >> 1;        divsum *= divsum;        int dv[] = new int[256 * divsum];        for (i = 0; i < 256 * divsum; i++) {            dv[i] = (i / divsum);        }        yw = yi = 0;        int[][] stack = new int[div][3];        int stackpointer;        int stackstart;        int[] sir;        int rbs;        int r1 = radius + 1;        int routsum, goutsum, boutsum;        int rinsum, ginsum, binsum;        for (y = 0; y < h; y++) {            rinsum = ginsum = binsum = routsum = goutsum = boutsum = rsum = gsum = bsum = 0;            for (i = -radius; i <= radius; i++) {                p = pix[yi + Math.min(wm, Math.max(i, 0))];                sir = stack[i + radius];                sir[0] = (p & 0xff0000) >> 16;                sir[1] = (p & 0x00ff00) >> 8;                sir[2] = (p & 0x0000ff);                rbs = r1 - Math.abs(i);                rsum += sir[0] * rbs;                gsum += sir[1] * rbs;                bsum += sir[2] * rbs;                if (i > 0) {                    rinsum += sir[0];                    ginsum += sir[1];                    binsum += sir[2];                } else {                    routsum += sir[0];                    goutsum += sir[1];                    boutsum += sir[2];                }            }            stackpointer = radius;            for (x = 0; x < w; x++) {                r[yi] = dv[rsum];                g[yi] = dv[gsum];                b[yi] = dv[bsum];                rsum -= routsum;                gsum -= goutsum;                bsum -= boutsum;                stackstart = stackpointer - radius + div;                sir = stack[stackstart % div];                routsum -= sir[0];                goutsum -= sir[1];                boutsum -= sir[2];                if (y == 0) {                    vmin[x] = Math.min(x + radius + 1, wm);                }                p = pix[yw + vmin[x]];                sir[0] = (p & 0xff0000) >> 16;                sir[1] = (p & 0x00ff00) >> 8;                sir[2] = (p & 0x0000ff);                rinsum += sir[0];                ginsum += sir[1];                binsum += sir[2];                rsum += rinsum;                gsum += ginsum;                bsum += binsum;                stackpointer = (stackpointer + 1) % div;                sir = stack[(stackpointer) % div];                routsum += sir[0];                goutsum += sir[1];                boutsum += sir[2];                rinsum -= sir[0];                ginsum -= sir[1];                binsum -= sir[2];                yi++;            }            yw += w;        }        for (x = 0; x < w; x++) {            rinsum = ginsum = binsum = routsum = goutsum = boutsum = rsum = gsum = bsum = 0;            yp = -radius * w;            for (i = -radius; i <= radius; i++) {                yi = Math.max(0, yp) + x;                sir = stack[i + radius];                sir[0] = r[yi];                sir[1] = g[yi];                sir[2] = b[yi];                rbs = r1 - Math.abs(i);                rsum += r[yi] * rbs;                gsum += g[yi] * rbs;                bsum += b[yi] * rbs;                if (i > 0) {                    rinsum += sir[0];                    ginsum += sir[1];                    binsum += sir[2];                } else {                    routsum += sir[0];                    goutsum += sir[1];                    boutsum += sir[2];                }                if (i < hm) {                    yp += w;                }            }            yi = x;            stackpointer = radius;            for (y = 0; y < h; y++) {                // Preserve alpha channel: ( 0xff000000 & pix[yi] )                pix[yi] = (0xff000000 & pix[yi]) | (dv[rsum] << 16)                        | (dv[gsum] << 8) | dv[bsum];                rsum -= routsum;                gsum -= goutsum;                bsum -= boutsum;                stackstart = stackpointer - radius + div;                sir = stack[stackstart % div];                routsum -= sir[0];                goutsum -= sir[1];                boutsum -= sir[2];                if (x == 0) {                    vmin[y] = Math.min(y + r1, hm) * w;                }                p = x + vmin[y];                sir[0] = r[p];                sir[1] = g[p];                sir[2] = b[p];                rinsum += sir[0];                ginsum += sir[1];                binsum += sir[2];                rsum += rinsum;                gsum += ginsum;                bsum += binsum;                stackpointer = (stackpointer + 1) % div;                sir = stack[stackpointer];                routsum += sir[0];                goutsum += sir[1];                boutsum += sir[2];                rinsum -= sir[0];                ginsum -= sir[1];                binsum -= sir[2];                yi += w;            }        }        bitmap.setPixels(pix, 0, w, 0, 0, w, h);        return (bitmap);    }}
布局文件：

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"     >    <FrameLayout        android:layout_width="match_parent"        android:layout_height="300dp">        <ImageView            android:id="@+id/old_image"            android:layout_width="match_parent"            android:layout_height="match_parent"            android:scaleType="fitXY"            android:src="@mipmap/a5" />        <ImageView            android:id="@+id/blur_image"            android:layout_width="match_parent"            android:layout_height="match_parent"            android:scaleType="fitXY">        </ImageView>    </FrameLayout></RelativeLayout>