Android学习教程之图片毛玻璃效果（4）

本教程为大家分享了android毛玻璃效果的具体代码，供大家参考，具体内容如下

blurimageactivity.java代码:

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();


      }
    });
  }
}

activity_blurimage.xml内容:

<?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>

utils文件夹下app.java代码:

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;
  }
}

fastblurutil.cs代码:

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);
  }

}

运行结果如图:

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。