I come with a situation, I must blur the background when opening the drawe, but only under the drawer, I have read that I must take a snapshot of the background, select that image, cut it and then blur it, this is the effect searched:
But no idea how, I've tried with the following code:
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Rect;
import android.graphics.drawable.ColorDrawable;
import android.graphics.drawable.Drawable;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarDrawerToggle;
import android.view.View;
import testblur.android.hitcel.com.R;
public class BlurActionBarDrawerToggle extends ActionBarDrawerToggle {
private static final int DOWNSAMPLING = 8;
private final DrawerLayout drawerLayout;
private final BlurAndDimView blurrer;
private Bitmap drawerSnapshot;
private final ColorDrawable imageBackgroundDrawable;
public BlurActionBarDrawerToggle(Activity activity, DrawerLayout drawerLayout, int drawerImageRes, int openDrawerContentDescRes, int closeDrawerContentDescRes, BlurAndDimView blurrer) {
super(activity, drawerLayout, drawerImageRes, openDrawerContentDescRes, closeDrawerContentDescRes);
//this should be roughly the same color as your window background
imageBackgroundDrawable = new ColorDrawable(activity.getResources().getColor(R.color.colorPrimaryDark));
this.drawerLayout = drawerLayout;
this.blurrer = blurrer;
}
@Override
public void onDrawerSlide(final View drawerView, final float slideOffset) {
super.onDrawerSlide(drawerView, slideOffset);
if (slideOffset > 0.0f) {
setBlurAlpha(slideOffset);
} else {
clearBlurImage();
}
}
@Override
public void onDrawerClosed(View view) {
clearBlurImage();
}
private void setBlurAlpha(float slideOffset) {
if (!blurrer.hasImage()) {
setBlurImage();
}
blurrer.handleScroll(slideOffset);
}
public void setBlurImage() {
blurrer.setVisibility(View.VISIBLE);
drawerSnapshot = drawViewToBitmap(drawerSnapshot, drawerLayout, DOWNSAMPLING, imageBackgroundDrawable);
blurrer.setImage(drawerSnapshot, DOWNSAMPLING);
}
public void clearBlurImage() {
blurrer.clearImage();
blurrer.setVisibility(View.INVISIBLE);
}
private Bitmap drawViewToBitmap(Bitmap dest, View view, int downSampling, Drawable background) {
float scale = 1f / downSampling;
int viewWidth = view.getWidth();
int viewHeight = view.getHeight();
int bmpWidth = (int) (viewWidth * scale);
int bmpHeight = (int) (viewHeight * scale);
if (dest == null || dest.getWidth() != bmpWidth || dest.getHeight() != bmpHeight) {
dest = Bitmap.createBitmap(bmpWidth, bmpHeight, Bitmap.Config.ARGB_8888);
}
Canvas c = new Canvas(dest);
background.setBounds(new Rect(0, 0, viewWidth, viewHeight));
background.draw(c);
if (downSampling > 1) {
c.scale(scale, scale);
}
view.draw(c);
view.layout(0, 0, viewWidth, viewHeight);
return dest;
}
}
and this one works with the previous one
public class BlurAndDimView extends View {
private static final int BLUR_RADIUS = 4;
private static final int BLUE_ALPHA = 178;
private static final int MAX_DIM_ALPHA = 127;
private Paint bitmapPaint;
private Paint dimPaint;
private Paint blueSemiTransparentPaint;
private int menuWidth;
private int titleHeight;
private Bitmap image;
private Rect rectDst;
private Rect rectSrc;
private int downSampling;
private Rect rectRest;
public BlurAndDimView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
postConstruct();
}
public BlurAndDimView(Context context, AttributeSet attrs) {
this(context, attrs, 0);
postConstruct();
}
public BlurAndDimView(Context context) {
this(context, null);
postConstruct();
}
private void postConstruct() {
bitmapPaint = new Paint(Paint.FILTER_BITMAP_FLAG | Paint.ANTI_ALIAS_FLAG | Paint.DITHER_FLAG);
dimPaint = new Paint();
blueSemiTransparentPaint = new Paint();
//You might want to also have a semitransparent overlay over your blurred image, since you can't control what's behind your menu.
blueSemiTransparentPaint.setColor(getResources().getColor(R.color.colorPrimaryDark));
blueSemiTransparentPaint.setAlpha(BLUE_ALPHA);
menuWidth = getResources().getDimensionPixelSize(R.dimen.browse_menu_width);
}
@Override
protected void onDraw(Canvas canvas) {
if (image != null) {
canvas.drawBitmap(image, rectSrc, rectDst, bitmapPaint);
canvas.drawRect(rectDst, blueSemiTransparentPaint);
canvas.drawRect(rectRest, dimPaint);
}
}
public void handleScroll(float xOffset) {
if(image != null) {
rectSrc.right = (int) (image.getWidth() * xOffset);
rectDst.right = rectSrc.right * downSampling;
rectRest.left = rectDst.right;
dimPaint.setAlpha((int) (xOffset * MAX_DIM_ALPHA));
invalidate();
}
}
public void setImage(Bitmap bmp, int downSampling) {
Bitmap cropped = Bitmap.createBitmap(bmp, 0, 0, menuWidth / downSampling, getHeight() / downSampling);
this.image = Blur.fastblur(getContext(), cropped, BLUR_RADIUS);
rectSrc = new Rect(0, 0, bmp.getWidth(), bmp.getHeight());
rectDst = new Rect(0, 0, menuWidth, getHeight());
rectRest = new Rect(menuWidth, 0, getWidth(), getHeight());
this.downSampling = downSampling;
invalidate();
}
public boolean hasImage() {
return image != null;
}
public void clearImage() {
image = null;
}
}
Additional this class is used to blur the image:
public class Blur {
private static final String TAG = "Blur";
@SuppressLint("NewApi")
public static Bitmap fastblur(Context context, Bitmap sentBitmap, int radius) {
if (Build.VERSION.SDK_INT > 16) {
Bitmap bitmap = sentBitmap.copy(sentBitmap.getConfig(), true);
final RenderScript rs = RenderScript.create(context);
final Allocation input = Allocation.createFromBitmap(rs, sentBitmap, Allocation.MipmapControl.MIPMAP_NONE,
Allocation.USAGE_SCRIPT);
final Allocation output = Allocation.createTyped(rs, input.getType());
final ScriptIntrinsicBlur script = ScriptIntrinsicBlur.create(rs, Element.U8_4(rs));
script.setRadius(radius /* e.g. 3.f */);
script.setInput(input);
script.forEach(output);
output.copyTo(bitmap);
return bitmap;
}
// 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]>
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);
}
but nothing, but I have no idea how to implement this in the Actual NavigationDrawer View created by Android Studio