高度模糊参考
淡不多扯，直接上代码：
MainActivity:
public class MainActivity extends Activity {
private ImageView old_image, blur_image;
private Bitmap mBitmap, overlay;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
init();
setView();
setModel();
}
private void init() {
old_image = (ImageView) findViewById(R.id.old_image);
blur_image = (ImageView) findViewById(R.id.blur_image);
}
/**
* @return 返回值：
* @作者：Gxy
* @creat on 2016/1/16 14:19
* @用途：设置模糊图片的长和宽
* @params 参数说明：
*/
private void setView() {
ViewGroup.LayoutParams params = blur_image.getLayoutParams();
params.height = 600;
params.width = ViewGroup.LayoutParams.MATCH_PARENT;
blur_image.setLayoutParams(params);
}
/**
* @return 返回值：
* @作者：Gxy
* @creat on 2016/1/16 14:27
* @用途： 通过计算，然后模糊图片，网上搜的，看不明白！
* @params 参数说明：
*/
private void setModel() {
if (null != overlay) {
blur_image.setImageBitmap(overlay);
}
//将old_image对象转化为bitmap对象
old_image.buildDrawingCache();
mBitmap = old_image.getDrawingCache();
mBitmap = ((BitmapDrawable) old_image.getDrawable()).getBitmap();
//下面这两个数字是控制模糊度的，可以自定义，测试了1-15之间的数字，自己感觉合适就行！
float scaleFactor =6;
float radius = 6;
int width = mBitmap.getWidth();
int height = mBitmap.getHeight();
overlay = Bitmap.createBitmap((int) (width / scaleFactor), (int) (height / scaleFactor), Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(overlay);
canvas.scale(1 / scaleFactor, 1 / scaleFactor);
Paint paint = new Paint();
paint.setFlags(Paint.FILTER_BITMAP_FLAG);
canvas.drawBitmap(mBitmap, 0, 0, paint);
overlay = FastBlur.doBlur(overlay, (int) radius, true);
blur_image.setImageBitmap(overlay);
}
}
下面这个类是计算方法，直接用的！
FastBlur：
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);
}
}
布局文件：
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
>
<FrameLayout
android:layout_width="match_parent"
android:layout_height="300dp">
<ImageView
android:id="@+id/old_image"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scaleType="fitXY"
android:src="@mipmap/a5" />
<ImageView
android:id="@+id/blur_image"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scaleType="fitXY">
</ImageView>
</FrameLayout>
</RelativeLayout>
高斯模糊+ 半透明View 更配哦
android:background="#XXxxxxxx"（颜色可以写在color中）
说明：半透明颜色值不同于平时使用的颜色，半透明颜色值共8位，前2位是透明度，后6位是颜色。
也就是说透明度和颜色结合就可以写出各种颜色的透明度。下面是透明度说明表，供大家参考。
| 不透明 | 100% | FF |
| 95% | F2 | |
| 90% | E6 | |
| 85% | D9 | |
| 80% | CC | |
| 75% | BF | |
| 70% | B3 | |
| 65% | A6 | |
| 60% | 99 | |
| 55% | 8C | |
| 半透明 | 50% | 80 |
| 45% | 73 | |
| 40% | 66 | |
| 35% | 59 | |
| 30% | 4D | |
| 25% | 40 | |
| 20% | 33 | |
| 15% | 26 | |
| 10% | 1A | |
| 5% | 0D | |
| 全透明 | 0% | 00 |
举例：
全透明：#00000000
半透明：#80000000
不透明：#FF000000
白色半透明：#80FFFFFF
红色30%透明：#4Dca0d0d
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