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
