Android学习教程之图片毛玻璃效果（4）

package com.siso.crazyworld;import android.content.res.Resources;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.text.TextUtils;import android.view.View;import android.widget.EditText;import android.widget.ImageView;import com.siso.crazyworld.utils.APP;import com.siso.crazyworld.utils.FastBlurUtil;public class BlurimageActivity extends AppCompatActivity {  ImageView image;  EditText edit;  @Override  protected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_blurimage);    image = (ImageView) findViewById(R.id.image);    edit = (EditText) findViewById(R.id.edit);    findViewById(R.id.button2).setOnClickListener(new View.OnClickListener() {      @Override      public void onClick(View v) {        String pattern = edit.getText().toString();        int scaleRatio = 0;        if (TextUtils.isEmpty(pattern)) {          scaleRatio = 0;        } else if (scaleRatio < 0) {          scaleRatio = 10;        } else {          scaleRatio = Integer.parseInt(pattern);        }        //    获取需要被模糊的原图bitmap        Resources res = getResources();        Bitmap scaledBitmap = BitmapFactory.decodeResource(res, R.drawable.filter);        //    scaledBitmap为目标图像，10是缩放的倍数（越大模糊效果越高）        Bitmap blurBitmap = FastBlurUtil.toBlur(scaledBitmap, scaleRatio);        image.setScaleType(ImageView.ScaleType.CENTER_CROP);        image.setImageBitmap(blurBitmap);      }    });    findViewById(R.id.button).setOnClickListener(new View.OnClickListener() {      @Override      public void onClick(View v) {        //url为网络图片的url，10 是缩放的倍数（越大模糊效果越高）        final String pattern = edit.getText().toString();        final String url =            //            "http://imgs.duwu.me/duwu/doc/cover/201601/18/173040803962.jpg";            "http://b.hiphotos.baidu.com/album/pic/item/caef76094b36acafe72d0e667cd98d1000e99c5f.jpg?psign=e72d0e667cd98d1001e93901213fb80e7aec54e737d1b867";        new Thread(new Runnable() {          @Override          public void run() {            int scaleRatio = 0;            if (TextUtils.isEmpty(pattern)) {              scaleRatio = 0;            } else if (scaleRatio < 0) {              scaleRatio = 10;            } else {              scaleRatio = Integer.parseInt(pattern);            }            //            下面的这个方法必须在子线程中执行            final Bitmap blurBitmap2 = FastBlurUtil.GetUrlBitmap(url, scaleRatio);            //            刷新ui必须在主线程中执行            APP.runOnUIThread(new Runnable() {              @Override              public void run() {                image.setScaleType(ImageView.ScaleType.CENTER_CROP);                image.setImageBitmap(blurBitmap2);              }            });          }        }).start();      }    });  }}

<?xml version="1.0" encoding="utf-8"?>  <LinearLayout 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"    android:orientation="vertical">    <ImageView      android:id="@+id/image2"      android:layout_width="match_parent"      android:layout_height="220dp"      android:scaleType="centerCrop"      android:background="@drawable/filter"/>    <LinearLayout      android:layout_width="match_parent"      android:layout_height="wrap_content"      android:orientation="horizontal">      <EditText        android:id="@+id/edit"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_marginTop="15dp"        android:hint="输入模糊度"        />      <Button        android:id="@+id/button2"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="转化毛玻璃"/>      <Button        android:id="@+id/button"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_marginLeft="4dp"        android:text="转化网络图片毛玻璃"/>    </LinearLayout>    <ImageView      android:id="@+id/image"      android:layout_width="match_parent"      android:layout_height="240dp"      android:layout_below="@+id/image2"      />  </LinearLayout>

package com.siso.crazyworld.utils;import android.app.Application;import android.os.Handler;public class APP extends Application {  private static APP sInstance;  public static APP getInstance() {    return sInstance;  }  /**   * 在主线程中刷新UI的方法   *   * @param r   */  public static void runOnUIThread(Runnable r) {    APP.getMainHandler().post(r);  }  /**   * app的入口函数   */  @Override  public void onCreate() {    super.onCreate();    //初始化context    sInstance = this;    //初始化handler    mHandler = new Handler();  }  //qcl用来在主线程中刷新ui  private static Handler mHandler;  public static Handler getMainHandler() {    return mHandler;  }}

package com.siso.crazyworld.utils;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import java.io.BufferedInputStream;import java.io.BufferedOutputStream;import java.io.ByteArrayOutputStream;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import java.net.URL;public class FastBlurUtil {  /**   * 根据imagepath获取bitmap   */  /**   * 得到本地或者网络上的bitmap url - 网络或者本地图片的绝对路径,比如:   * A.网络路径: url="http://blog.foreverlove.us/girl2.png" ;   * B.本地路径:url="file://mnt/sdcard/photo/image.png";   * C.支持的图片格式 ,png, jpg,bmp,gif等等   * @param url   * @return   */  public static int IO_BUFFER_SIZE = 2 * 1024;  public static Bitmap GetUrlBitmap(String url, int scaleRatio) {    int blurRadius = 8;//通常设置为8就行。    if (scaleRatio <= 0) {      scaleRatio = 10;    }    Bitmap originBitmap = null;    InputStream in = null;    BufferedOutputStream out = null;    try {      in = new BufferedInputStream(new URL(url).openStream(), IO_BUFFER_SIZE);      final ByteArrayOutputStream dataStream = new ByteArrayOutputStream();      out = new BufferedOutputStream(dataStream, IO_BUFFER_SIZE);      copy(in, out);      out.flush();      byte[] data = dataStream.toByteArray();      originBitmap = BitmapFactory.decodeByteArray(data, 0, data.length);      Bitmap scaledBitmap = Bitmap.createScaledBitmap(originBitmap,          originBitmap.getWidth() / scaleRatio,          originBitmap.getHeight() / scaleRatio,          false);      Bitmap blurBitmap = doBlur(scaledBitmap, blurRadius, true);      return blurBitmap;    } catch (IOException e) {      e.printStackTrace();      return null;    }  }  private static void copy(InputStream in, OutputStream out)      throws IOException {    byte[] b = new byte[IO_BUFFER_SIZE];    int read;    while ((read = in.read(b)) != -1) {      out.write(b, 0, read);    }  }  //  把本地图片毛玻璃化  public static Bitmap toBlur(Bitmap originBitmap, int scaleRatio) {    //    int scaleRatio = 10;    // 增大scaleRatio缩放比，使用一样更小的bitmap去虚化可以到更好的得模糊效果，而且有利于占用内存的减小；    int blurRadius = 8;//通常设置为8就行。    //增大blurRadius，可以得到更高程度的虚化，不过会导致CPU更加intensive    /* 其中前三个参数很明显，其中宽高我们可以选择为原图尺寸的1/10；    第四个filter是指缩放的效果，filter为true则会得到一个边缘平滑的bitmap，    反之，则会得到边缘锯齿、pixelrelated的bitmap。    这里我们要对缩放的图片进行虚化，所以无所谓边缘效果，filter=false。*/    if (scaleRatio <= 0) {      scaleRatio = 10;    }    Bitmap scaledBitmap = Bitmap.createScaledBitmap(originBitmap,        originBitmap.getWidth() / scaleRatio,        originBitmap.getHeight() / scaleRatio,        false);    Bitmap blurBitmap = doBlur(scaledBitmap, blurRadius, true);    return blurBitmap;  }  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);  }}