很多時候我們深夜看些電影 偶爾會看些這樣的。

充滿馬賽克的電影，當你云雨一番的時候，看著旁邊的衛生紙的時候，有沒有想安卓能不能實現類似這樣的功能呢。

下面我就帶大家來做這種模糊功能類似馬賽克。

首先做這個之前，我們需要先找一張讓人臉紅的照片來給他打上馬賽克。

?下面我們就要辣手摧花了。

首先我們先把 一個高斯模糊 算法工具類 導入，置于這個算法是怎么算的，我不懂，你們也別浪費時間，反正也不搞不懂。

FastBlur.java

package com.example.gaosi;import android.graphics.Bitmap;/*** 高斯模糊。圖片背景變成毛玻璃*/ public class FastBlur {public static Bitmap doBlur(Bitmap sentBitmap, int radius, boolean canReuseInBitmap) {// Stack Blur v1.0 from// http://www.quasimondo.com/StackBlurForCanvas/StackBlurDemo.html//// Java Author: Mario Klingemann <mario at="" quasimondo.com="">// http://incubator.quasimondo.com// created Feburary 29, 2004// Android port : Yahel Bouaziz <yahel at="" kayenko.com="">// http://www.kayenko.com// ported april 5th, 2012// This is a compromise between Gaussian Blur and Box blur// It creates much better looking blurs than Box Blur, but is// 7x faster than my Gaussian Blur implementation.//// I called it Stack Blur because this describes best how this// filter works internally: it creates a kind of moving stack// of colors whilst scanning through the image. Thereby it// just has to add one new block of color to the right side// of the stack and remove the leftmost color. The remaining// colors on the topmost layer of the stack are either added on// or reduced by one, depending on if they are on the right or// on the left side of the stack.//// If you are using this algorithm in your code please add// the following line://// Stack Blur Algorithm by Mario Klingemann <mario@quasimondo.com>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);} } 下面就是我們的邏輯實現代碼 很簡單。

MainActivity.java

package com.example.gaosi; import android.support.v7.app.ActionBarActivity; import android.annotation.SuppressLint; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.Canvas; import android.graphics.Matrix; import android.graphics.Paint; import android.graphics.drawable.BitmapDrawable; import android.os.Bundle; import android.view.Menu; import android.view.View; import android.view.ViewTreeObserver.OnPreDrawListener; import android.widget.LinearLayout;public class MainActivity extends ActionBarActivity {private LinearLayout gaosiBackLayout;private Paint paint;protected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);gaussianBlur();}//高斯模糊private void gaussianBlur() {// TODO Auto-generated method stubCanvas canvas=new Canvas();gaosiBackLayout=(LinearLayout) findViewById(R.id.wode_fastBlur_gaosi_layout);final Bitmap bitmap = BitmapFactory.decodeResource(getResources(),R.drawable.abc);// 獲得圖片的寬高int width = bitmap.getWidth();int height = bitmap.getHeight();// 設置想要的大小int newWidth = 1200;int newHeight = 1200;// 計算縮放比例float scaleWidth = ((float) newWidth) / width;float scaleHeight = ((float) newHeight) / height;// 取得想要縮放的matrix參數Matrix matrix = new Matrix();matrix.postScale(scaleWidth, scaleHeight);// 得到新的圖片final Bitmap newbm = Bitmap.createBitmap(bitmap, 0, 0, width, height, matrix, true);// 放在畫布上canvas.drawBitmap(newbm, 0, 0, paint);// 設置想要的大小gaosiBackLayout.getViewTreeObserver().addOnPreDrawListener(new OnPreDrawListener() {@Overridepublic boolean onPreDraw() {blur(newbm, gaosiBackLayout);return true;}});}@SuppressLint("NewApi") private void blur(Bitmap bkg, View view) {//這里是選擇我們模糊的程度float scaleFactor = 8;//模糊筆的粗度float radius = 2;Bitmap overlay = Bitmap.createBitmap((int) (view.getMeasuredWidth() / scaleFactor),(int) (view.getMeasuredHeight() / scaleFactor),Bitmap.Config.ARGB_8888);Canvas canvas = new Canvas(overlay);canvas.translate(-view.getLeft() / scaleFactor, -view.getTop()/ scaleFactor);canvas.scale(1 / scaleFactor, 1 / scaleFactor);Paint paint = new Paint();paint.setFlags(Paint.FILTER_BITMAP_FLAG);canvas.drawBitmap(bkg, 0, 0, paint);overlay = FastBlur.doBlur(overlay, (int) radius, true);view.setBackground(new BitmapDrawable(getResources(), overlay));}} 我們的布局：

<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"tools:context="com.example.gaosi.MainActivity" ><LinearLayout android:orientation="vertical"android:id="@+id/wode_fastBlur_gaosi_layout"android:layout_width="match_parent"android:layout_height="match_parent"android:background="@drawable/abc"android:layout_gravity="center_horizontal"> </LinearLayout> </RelativeLayout>
下面 就是我們的效果圖了

好的 我們的效果就實現了 就這么簡單 就實現了馬賽克功能

源碼 傳不上去 ，所有代碼都貼出來了。

總結

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