- 博客使用 FastBlur 的步骤1) 使用下面的代码拍摄背景快照private static Bitmap takeScreenShot(Activity 活动){查看视图 = activity.getWindow().getDecorView();view.setDrawingCacheEnabled(true);view.buildDrawingCache();位图 b1 = view.getDrawingCache();矩形框 = new Rect();activity.getWindow().getDecorView().getWindowVisibleDisplayFrame(frame);int statusBarHeight = frame.top;int width = activity.getWindowManager().getDefaultDisplay().getWidth();int height = activity.getWindowManager().getDefaultDisplay().getHeight();位图 b = Bitmap.createBitmap(b1, 0, statusBarHeight, width, height - statusBarHeight);view.destroyDrawingCache();返回 b;}像这样使用它 Bitmap map=takeScreenShot(BlurImageView.this);//你的活动名称2) 调用方法 Bitmap fast=fastblur(map, 10); 来自 这里 public Bitmap fastblur(Bitmap sentBitmap, int radius) {位图位图 = sentBitmap.copy(sentBitmap.getConfig(), true);如果(半径<1){返回(空);}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 = 半径 + 半径 + 1;int r[] = 新的 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 0) {林苏姆 += 先生 [0];人参 += 先生 [1];binsum += 先生[2];} 别的 {routsum += 先生 [0];痛风+=先生[1];较量 += 先生 [2];}}堆栈指针 = 半径;for (x = 0; x 0) {林苏姆 += 先生 [0];人参 += 先生 [1];binsum += 先生[2];} 别的 {routsum += 先生 [0];痛风+=先生[1];较量 += 先生 [2];}如果(我<嗯){yp += w;}}yi = x;堆栈指针 = 半径;对于 (y = 0; y 3) 最后在 Button 点击btnblur.setOnClickListener(new OnClickListener() {@覆盖公共无效onClick(查看视图){AlertDialog.Builder builder=new AlertDialog.Builder(BlurImageView.this,R.style.Theme_D1NoTitleDim);builder.setTitle("内容");builder.setMessage("点击确定退出");builder.setPositiveButton("ON", new DialogInterface.OnClickListener() {@覆盖public void onClick(DialogInterface dialog, int which) {back_dim_layout.setVisibility(View.GONE);对话框取消();}});警报=builder.create();位图 map=takeScreenShot(BlurImageView.this);位图 fast=fastblur(map, 10);final Drawable draw=new BitmapDrawable(getResources(),fast);alert.getWindow().setBackgroundDrawable(draw);警报.显示();}});就是这样,您可以看到活动背后的模糊图像希望这对任何人都有帮助...As we know from API 14 the Below Blur has been deprecated dialog.getWindow().addFlags(WindowManager.LayoutParams.FLAG_BLUR_BEHIND);Is there any alternative for this to make the Screen Blur behind DialogI have tried FAST blur 解决方案 Update:We can also use renderscript api to blur background for API level >= 17 and uses fastblur for API level < 17. Please find below Github project. - Github Project - BlogSteps Using FastBlur1) Take the Snapshot of Your Background using Below Codeprivate static Bitmap takeScreenShot(Activity activity) { View view = activity.getWindow().getDecorView(); view.setDrawingCacheEnabled(true); view.buildDrawingCache(); Bitmap b1 = view.getDrawingCache(); Rect frame = new Rect(); activity.getWindow().getDecorView().getWindowVisibleDisplayFrame(frame); int statusBarHeight = frame.top; int width = activity.getWindowManager().getDefaultDisplay().getWidth(); int height = activity.getWindowManager().getDefaultDisplay().getHeight(); Bitmap b = Bitmap.createBitmap(b1, 0, statusBarHeight, width, height - statusBarHeight); view.destroyDrawingCache(); return b; }use it Like This Bitmap map=takeScreenShot(BlurImageView.this);// Your Actitvity Name2) Call the Method Bitmap fast=fastblur(map, 10); Got it From Here public Bitmap fastblur(Bitmap sentBitmap, int radius) { 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); }3) Finally on Button clickbtnblur.setOnClickListener(new OnClickListener() { @Override public void onClick(View view) { AlertDialog.Builder builder=new AlertDialog.Builder(BlurImageView.this,R.style.Theme_D1NoTitleDim); builder.setTitle("Content"); builder.setMessage("CLICK OK to Exit"); builder.setPositiveButton("ON", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { back_dim_layout.setVisibility(View.GONE); dialog.cancel(); } }); alert=builder.create(); Bitmap map=takeScreenShot(BlurImageView.this); Bitmap fast=fastblur(map, 10); final Drawable draw=new BitmapDrawable(getResources(),fast); alert.getWindow().setBackgroundDrawable(draw); alert.show(); } });That's It Now You can see the Blur Image Behind You ActivityHope this could Help full for AnyOne... 这篇关于模糊 AlertDialog 背后的背景的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持! 上岸,阿里云!