Android 实现高斯模糊效果

方法一的原文链接未查询到，对原创作者表示歉意。
目前我知道的有2中办法
第一种，调用Android的API完成，但是支持API17及以上
第二种，Github的方法，每个像素点去做模糊，链接：https://github.com/kikoso/android-stackblur/blob/master/StackBlur/src/com/enrique/stackblur/JavaBlurProcess.java

方法一：

public class RSBlurProcess implements BlurProcess {    private Context context;    public RSBlurProcess(Context context) {        this.context = context;    }    /**     *     * @param original 需要模糊的bitmap     * @param radius   模糊的半径，最大值25     * @return     */    @TargetApi(Build.VERSION_CODES.JELLY_BEAN_MR1)    @Override    public Bitmap blur(Bitmap original, float radius) {        long start = System.currentTimeMillis();        //Let's create an empty bitmap with the same size of the bitmap we want to blur        Bitmap outBitmap = Bitmap.createBitmap(original.getWidth(), original.getHeight(), Bitmap.Config.ARGB_8888);        //Instantiate a new Renderscript        RenderScript rs = RenderScript.create(context);        //Create an Intrinsic Blur Script using the Renderscript        ScriptIntrinsicBlur blurScript = ScriptIntrinsicBlur.create(rs, Element.U8_4(rs));        //Create the Allocations (in/out) with the Renderscript and the in/out bitmaps        Allocation allIn = Allocation.createFromBitmap(rs, original);        Allocation allOut = Allocation.createFromBitmap(rs, outBitmap);        //Set the radius of the blur        blurScript.setRadius(radius);        //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        original.recycle();        //After finishing everything, we destroy the Renderscript.        rs.destroy();        return outBitmap;    }}

第二种方法代码较多，建议直接去github查看。

建议尽可能不要在客户端做高斯模糊，因为内存开销太大，如果不是特殊需求（如模糊需要动态变化），尽可能直接服务端做模糊。