使用：
1.在执行弹出界面前，先将其当前屏幕截图。
BlurBuilder.snapShotWithoutStatusBar(getActivity());
2.为了确保界面切入无效果。
startActivity(wechatIntent);
context.overridePendingTransition(
android.view.animation.Animation.INFINITE,
android.view.animation.Animation.INFINITE);
3.在切换的页面中初始化背景ImageView：
private void applyBlur() {
iv_shared_layout.setImageBitmap(BlurBuilder.blur(iv_shared_layout));
if (BlurBuilder.isBlurFlag()) {
iv_shared_layout.setVisibility(View.VISIBLE);
}
}
4.在acitivity的super.finish();或者在onDestroy中回收资源：
@Override
public void finish() {
defaultFinishNotActivityHelper();
BlurBuilder.recycle();
overridePendingTransition(android.view.animation.Animation.INFINITE,
android.view.animation.Animation.INFINITE);
}
毛玻璃模糊效果使用类：
public class BlurBuilder {
private static final float BITMAP_SCALE = 0.4f;
private static final float BLUR_RADIUS = 7.5f;
private static Bitmap tab_bg = null;
private static Bitmap overlay = null;
private static boolean blurFlag = false;
public static boolean isBlurFlag() {
return BlurBuilder.blurFlag;
}
public static void setBlurFlag(boolean blurFlag) {
BlurBuilder.blurFlag = blurFlag;
}
public static Bitmap blur(View v) {
if (tab_bg == null) {
android.util.Log.i("", "tab_bg == null");
blurFlag = false;
return null;
}
blurFlag = true;
blur(v.getContext(), tab_bg);
return overlay;
}
public static void blur(Context ctx, Bitmap image) {
if (overlay != null) {
recycle();
}
try {
int width = Math.round(image.getWidth() * BITMAP_SCALE);
int height = Math.round(image.getHeight() * BITMAP_SCALE);
overlay = Bitmap.createScaledBitmap(image, (int) (width),
(int) (height), false);
overlay = FastBlur.doBlur(overlay, (int) BLUR_RADIUS, true);
} catch (Exception e) {
e.printStackTrace();
}
}
public static void getScreenshot(View v) {
if (tab_bg != null) {
recycle();
}
try {
tab_bg = Bitmap.createBitmap(v.getWidth(), v.getHeight(),
Bitmap.Config.RGB_565);
Canvas c = new Canvas(tab_bg);
v.draw(c);
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 获取当前屏幕截图，不包含状态栏
*
* @param activity
* @return
*/
public static void snapShotWithoutStatusBar(Activity activity) {
if (tab_bg != null) {
recycle();
}
View view = activity.getWindow().getDecorView();
try {
view.setDrawingCacheEnabled(true);
view.buildDrawingCache();
tab_bg = view.getDrawingCache();
Rect frame = new Rect();
activity.getWindow().getDecorView()
.getWindowVisibleDisplayFrame(frame);
int statusBarHeight = frame.top;
int width = ScreenUtils.getScreenWidth(activity);
int height = ScreenUtils.getScreenHeight(activity);
tab_bg = Bitmap.createBitmap(tab_bg, 0, statusBarHeight, width,
height - statusBarHeight);
view.destroyDrawingCache();
} catch (Exception e) {
e.printStackTrace();
getScreenshot(view);
}
}
public static void recycle() {
try {
if (tab_bg != null) {
tab_bg.recycle();
System.gc();
tab_bg = null;
}
if (overlay != null) {
overlay.recycle();
System.gc();
overlay = null;
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
毛玻璃模糊效果类：
public class FastBlur {
public static Bitmap doBlur(Bitmap sentBitmap, int radius,
boolean canReuseInBitmap) {
Bitmap bitmap;
if (canReuseInBitmap) {
bitmap = sentBitmap;
} else {
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];
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;
}
}
bitmap.setPixels(pix, 0, w, 0, 0, w, h);
return (bitmap);
}
}