最近專案中有需要到“毛玻璃”效果，網上找一下，千篇一律。高談闊論扯淡的多，真正有用的沒幾個！

藉助此文，做修改之後，實現效果！我只是個搬運工，在此表示感謝！

淡不多扯，直接上程式碼：

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：初始化元件
* @params 引數說明：
*/
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：設定模糊圖片的長和寬
* @params 引數說明：
*/
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： 通過計算，然後模糊圖片，網上搜的，看不明白！
* @params 引數說明：
*/
private void setModel() {
        if (null != overlay) {
            blur_image.setImageBitmap(overlay);
        }
        //將old_image物件轉化為bitmap物件
old_image.buildDrawingCache();
        mBitmap = old_image.getDrawingCache();
        mBitmap = ((BitmapDrawable) old_image.getDrawable()).getBitmap();
        //下面這兩個數字是控制模糊度的，可以自定義，測試了1-15之間的數字，自己感覺合適就行！
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);
    }
}

下面這個類是計算方法，直接用的，不是吾等暫時能搞明白的！

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);
    }
}

<?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>