我有一个链接是图像。现在我想加载这个图像并在Android Studio图像中模糊它。
这是我的班级。这是从网址模糊但它失败了。
private void blurBackGround() {
try {
URL url = new URL(dmMember.getMemberImage());
Bitmap image = BitmapFactory.decodeStream(url.openConnection().getInputStream());
Bitmap blurredBitmap = blur(image);
imageView.setImageBitmap(blurredBitmap);
} catch(IOException e) {
System.out.println(e);
}
}
这是模糊的图像
@SuppressLint("NewApi")
public Bitmap blur(Bitmap image) {
if (null == image) return null;
Bitmap outputBitmap = Bitmap.createBitmap(image);
final RenderScript renderScript = RenderScript.create(this);
Allocation tmpIn = Allocation.createFromBitmap(renderScript, image);
Allocation tmpOut = Allocation.createFromBitmap(renderScript, outputBitmap);
//Intrinsic Gausian blur filter
@SuppressLint({"NewApi", "LocalSuppress"}) ScriptIntrinsicBlur theIntrinsic = ScriptIntrinsicBlur.create(renderScript, Element.U8_4(renderScript));
theIntrinsic.setRadius(BLUR_RADIUS);
theIntrinsic.setInput(tmpIn);
theIntrinsic.forEach(tmpOut);
tmpOut.copyTo(outputBitmap);
return outputBitmap;
}
这里有一个解决方案：https://stackoverflow.com/a/10028267/842607
他使用了盒子模糊和高斯模糊。以下是供参考的代码，以防链接消失
/**
* Stack Blur v1.0 from
* http://www.quasimondo.com/StackBlurForCanvas/StackBlurDemo.html
* Java Author: Mario Klingemann <mario at quasimondo.com>
* http://incubator.quasimondo.com
*
* created Feburary 29, 2004
* Android port : Yahel Bouaziz <yahel at kayenko.com>
* http://www.kayenko.com
* ported april 5th, 2012
*
* This is a compromise between Gaussian Blur and Box blur
* It creates much better looking blurs than Box Blur, but is
* 7x faster than my Gaussian Blur implementation.
*
* I called it Stack Blur because this describes best how this
* filter works internally: it creates a kind of moving stack
* of colors whilst scanning through the image. Thereby it
* just has to add one new block of color to the right side
* of the stack and remove the leftmost color. The remaining
* colors on the topmost layer of the stack are either added on
* or reduced by one, depending on if they are on the right or
* on the left side of the stack.
*
* If you are using this algorithm in your code please add
* the following line:
* Stack Blur Algorithm by Mario Klingemann <[email protected]>
*/
public Bitmap fastblur(Bitmap sentBitmap, float scale, int radius) {
int width = Math.round(sentBitmap.getWidth() * scale);
int height = Math.round(sentBitmap.getHeight() * scale);
sentBitmap = Bitmap.createScaledBitmap(sentBitmap, width, height, false);
Bitmap 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];
Log.e("pix", w + " " + h + " " + pix.length);
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;
}
}
Log.e("pix", w + " " + h + " " + pix.length);
bitmap.setPixels(pix, 0, w, 0, 0, w, h);
return (bitmap);
}
public class Bluer {
private static final float SCALE = 1.7f;
private static final float BLUR_RADIUS = 25f;
public static Bitmap blur(Context context, Bitmap image) {
int height = Math.round(image.getHeight() * SCALE);
int width = Math.round(image.getWidth() * SCALE);
Bitmap inputBitmap = Bitmap.createScaledBitmap(image, width, height, false);
Bitmap outputBitmap = Bitmap.createBitmap(inputBitmap);
RenderScript renderScript = RenderScript.create(context);
ScriptIntrinsicBlur intrinsicBlur = ScriptIntrinsicBlur.create(renderScript, Element.U8_4(renderScript));
Allocation tmIn = Allocation.createFromBitmap(renderScript, inputBitmap);
Allocation tmOut = Allocation.createFromBitmap(renderScript, outputBitmap);
intrinsicBlur.setRadius(BLUR_RADIUS);
intrinsicBlur.setInput(tmIn);
intrinsicBlur.forEach(tmOut);
tmOut.copyTo(outputBitmap);
return outputBitmap;
}
}
Bitmap outputBitmap = Bluer.blur(this, BitmapFactory.decodeResource(getResources(), R.drawable.pic1));
imageview.setImageBitmap(outputBitmap);
public class BlurredAsynctask extends AsyncTask<String, Void, Bitmap> {
private Context context;
private ImageView iv;
private int radius;
public BlurredAsynctask(Context context, ImageView iv, int radius) {
this.context = context;
this.iv = iv;
this.radius = radius;
}
@Override
protected Bitmap doInBackground(String... params) {
URL url = null;
try {
url = new URL(params[0]);
} catch (MalformedURLException e) {
e.printStackTrace();
url = null;
}
try {
if (url != null) {
Bitmap image = BitmapFactory.decodeStream(url.openConnection()
.getInputStream());
return image;
} else {
return null;
}
} catch (IOException e) {
e.printStackTrace();
return null;
}
}
@Override
protected void onPostExecute(Bitmap result) {
super.onPostExecute(result);
if (result != null) {
Bitmap bm = CreateBlurredImage(result, radius);
iv.setImageBitmap(bm);
}
}
private Bitmap CreateBlurredImage(final Bitmap bm, int radius) {
Bitmap blurredBitmap;
RenderScript rs = RenderScript.create(context);
ScriptIntrinsicBlur script = ScriptIntrinsicBlur.create(rs, Element.U8_4(rs));
Allocation input;
input = Allocation.createFromBitmap(rs, bm,
Allocation.MipmapControl.MIPMAP_FULL, Allocation.USAGE_SCRIPT);
script.setRadius(radius);
script.setInput(input);
blurredBitmap = Bitmap.createBitmap(bm.getWidth(),
bm.getHeight(), Bitmap.Config.ARGB_8888);
Allocation output;
output = Allocation.createTyped(rs, input.getType());
script.forEach(output);
output.copyTo(blurredBitmap);
script.destroy();
return blurredBitmap;
}
}
在MainActivity中添加此代码
final ImageView iv_profilepic = (ImageView) findViewById(R.id.iv_profilepic);
final BlurredAsynctask task = new BlurredAsynctask(this, iv_profilepic, 25);
task.execute("https://secure.i.telegraph.co.uk/multimedia/archive/03597/POTD_chick_3597497k.jpg");