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实现思路是结合Glide和RenderScript来实现高斯模糊的效果

1.在Module的build.gradle的defaultConfig标签下配置

renderscriptTargetApi 19

renderscriptSupportModeEnabled true

2.引用Glide的问题这里就不多提了,直接上Glide的实现代码

public static void displayBlurImg(Context context,String url,ImageView imageView) {

Glide.with(context)

.load(url)

.placeholder(R.drawable.image_smile)

.error(R.drawable.image_smile)

.crossFade(1000)

.bitmapTransform(new BlurTransformation(context,23,4)) // “23”:设置模糊度(在0.0到25.0之间),默认”25";"4":图片缩放比例,默认“1”。

.into(imageView);

}

3.实现的关键就是这个转换器BlurTransformation

public class BlurTransformation implements Transformation{

private static int MAX_RADIUS = 25;

private static int DEFAULT_DOWN_SAMPLING = 1;

private Context mContext;

private BitmapPool mBitmapPool;

private int mRadius;

private int mSampling;

public BlurTransformation(Context context) {

this(context, Glide.get(context).getBitmapPool(), MAX_RADIUS, DEFAULT_DOWN_SAMPLING);

}

public BlurTransformation(Context context, BitmapPool pool) {

this(context, pool, MAX_RADIUS, DEFAULT_DOWN_SAMPLING);

}

public BlurTransformation(Context context, BitmapPool pool, int radius) {

this(context, pool, radius, DEFAULT_DOWN_SAMPLING);

}

public BlurTransformation(Context context, int radius) {

this(context, Glide.get(context).getBitmapPool(), radius, DEFAULT_DOWN_SAMPLING);

}

public BlurTransformation(Context context, BitmapPool pool, int radius, int sampling) {

mContext = context;

mBitmapPool = pool;

mRadius = radius;

mSampling = sampling;

}

public BlurTransformation(Context context, int radius, int sampling) {

mContext = context;

mBitmapPool = Glide.get(context).getBitmapPool();

mRadius = radius;

mSampling = sampling;

}

@Override

public Resourcetransform(Resourceresource, int outWidth, int outHeight) {

Bitmap source = resource.get();

int width = source.getWidth();

int height = source.getHeight();

int scaledWidth = width / mSampling;

int scaledHeight = height / mSampling;

Bitmap bitmap = mBitmapPool.get(scaledWidth, scaledHeight, Bitmap.Config.ARGB_8888);

if (bitmap == null) {

bitmap = Bitmap.createBitmap(scaledWidth, scaledHeight, Bitmap.Config.ARGB_8888);

}

Canvas canvas = new Canvas(bitmap);

canvas.scale(1 / (float) mSampling, 1 / (float) mSampling);

Paint paint = new Paint();

paint.setFlags(Paint.FILTER_BITMAP_FLAG);

canvas.drawBitmap(source, 0, 0, paint);

RenderScriptGaussianBlur rsBlur = new RenderScriptGaussianBlur(mContext);

bitmap = rsBlur.blur(mRadius, bitmap);

rsBlur.destroy();

return BitmapResource.obtain(bitmap, mBitmapPool);

}

@Override public String getId() {

return "BlurTransformation(radius=" + mRadius + ", sampling=" + mSampling + ")";

}

}

最后实现的效果是这样的

59bc4709aab1b182b93040b0acb0e833.png