/************************ 
* 高斯模糊處理 
* @param bitmap 
* @param context 
* @return 
***********************/ 
public static Bitmap blurBitmap(Bitmap bitmap, Context context) { 
// 用需要創(chuàng)建高斯模糊bitmap創(chuàng)建一個空的bitmap 
Bitmap outBitmap = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), Config.ARGB_8888); 
// 初始化Renderscript，該類提供了RenderScript context，創(chuàng)建其他RS類之前必須先創(chuàng)建這個類，其控制RenderScript的初始化，資源管理及釋放 
RenderScript rs = RenderScript.create(context); 
// 創(chuàng)建高斯模糊對象 
ScriptIntrinsicBlur blurScript = ScriptIntrinsicBlur.create(rs, Element.U8_4(rs)); 
// 創(chuàng)建Allocations，此類是將數(shù)據(jù)傳遞給RenderScript內(nèi)核的主要方法，并制定一個后備類型存儲給定類型 
Allocation allIn = Allocation.createFromBitmap(rs, bitmap); 
Allocation allOut = Allocation.createFromBitmap(rs, outBitmap); 
//設(shè)定模糊度(注：Radius最大只能設(shè)置25.f) 
blurScript.setRadius(15.f); 
// Perform the Renderscript 
blurScript.setInput(allIn); 
blurScript.forEach(allOut); 
// Copy the final bitmap created by the out Allocation to the outBitmap 
allOut.copyTo(outBitmap); 
// recycle the original bitmap 
bitmap.recycle(); 
// After finishing everything, we destroy the Renderscript. 
rs.destroy(); 
return outBitmap; 
}

/** 
* Compress image by pixel, this will modify image width/height. 
* 
* @param imgPath image path 
* @param pixelW target pixel of width 
* @param pixelH target pixel of height 
* @return 
*/ 
public static Bitmap ratio(String imgPath, float pixelW, float pixelH) { 
BitmapFactory.Options newOpts = new BitmapFactory.Options(); 
// 開始讀入圖片，此時把options.inJustDecodeBounds 設(shè)回true，即只讀邊不讀內(nèi)容 
newOpts.inJustDecodeBounds = true; 
newOpts.inPreferredConfig = Config.RGB_565; 
// Get bitmap info, but notice that bitmap is null now 
Bitmap bitmap = BitmapFactory.decodeFile(imgPath,newOpts); 
newOpts.inJustDecodeBounds = false; 
int w = newOpts.outWidth; 
int h = newOpts.outHeight; 
float ww = pixelW; //設(shè)置寬度為120f，可以明顯看到圖片縮小了 
float hh = pixelH; //設(shè)置高度為240f時，可以明顯看到圖片縮小了 
//縮放比，由于是固定比例縮放，只用高或者寬其中一個數(shù)據(jù)進(jìn)行計算即可 
int be = 1;//表示不縮放 
if (w > h && w > ww) { //如果寬度大的話根據(jù)寬度固定大小縮放 
be = (int) (newOpts.outWidth / ww); 
} else if (w < h && h > hh) { //如果高度高的話根據(jù)寬度固定大小縮放 
be = (int) (newOpts.outHeight / hh); 
} 
if (be <= 0) be = 1; 
newOpts.inSampleSize = be;//設(shè)置縮放比例 
// 開始壓縮圖片，注意此時已經(jīng)把options.inJustDecodeBounds 設(shè)回false了 
bitmap = BitmapFactory.decodeFile(imgPath, newOpts); 
// 壓縮好比例大小后再進(jìn)行質(zhì)量壓縮 
//return compress(bitmap, maxSize); //這里再進(jìn)行質(zhì)量壓縮的意義不大，反而耗資源，刪除 
return bitmap; 
} 

import android.support.v8.renderscript.Allocation; 
import android.support.v8.renderscript.Element; 
import android.support.v8.renderscript.RenderScript; 
import android.support.v8.renderscript.ScriptIntrinsicBlur;