android创建透明bitmap_android中怎么把一个图片设置透明化

❶ android bitmap alpha 什么是图片的alpha值,alpha值有什么作用

这个指的就是透明度，android里面xml是八位16进制数表示，譬如#ff123a11 前两位是透明度,后六位是颜色数值，也可以直接使用后6位，这样前两位的数值就默认为ff即为白色，前两位就是alpha值

❷ android 文本框中加入多个bitmap图片, 点击bitmap 弹出对话框该怎么写呢是不是要获取透明的焦点

最简单的办法是，重写一个文本框，bitmap的显示采用imageSpan的方式设置到文本中，点击弹出对话框采用获取点击时触摸的文本的位置判断为在图片位置即弹出对话框。

❸ android中怎么把一个图片设置透明化。

直接用一下代码可以让图片变得透明，具体效果自己看看吧：

java">
/**


*图片透明度处理

*

*@paramsourceImg

*原始图片

*@paramnumber

*透明度

*@return

*/

publicstaticBitmapsetAlpha(BitmapsourceImg,intnumber){

int[]argb=newint[sourceImg.getWidth()*sourceImg.getHeight()];

sourceImg.getPixels(argb,0,sourceImg.getWidth(),0,0,sourceImg.getWidth(),sourceImg.getHeight());

//获得图片的ARGB值

number=number*255/100;

for(inti=0;i<argb.length;i++){

argb=(number<<24)|(argb&0x00FFFFFF);

//修改最高2位的值

}

sourceImg=Bitmap.createBitmap(argb,sourceImg.getWidth(),sourceImg.getHeight(),Config.ARGB_8888);

returnsourceImg;

}

❹ android怎么生成bitmap

1、

[java] view plain
public Bitmap convertViewToBitmap(View view){

Bitmap bitmap = Bitmap.createBitmap(view.getWidth(), view.getHeight(),
Bitmap.Config.ARGB_8888);
//利用bitmap生成画布
Canvas canvas = new Canvas(bitmap);

//把view中的内容绘制在画布上
view.draw(canvas);

return bitmap;
}

2、

[java] view plain
/**
* save view as a bitmap
*/
private Bitmap saveViewBitmap(View view) {
// get current view bitmap
view.setDrawingCacheEnabled(true);
view.buildDrawingCache(true);
Bitmap bitmap = view.getDrawingCache(true);

Bitmap bmp = plicateBitmap(bitmap);
if (bitmap != null && !bitmap.isRecycled()) { bitmap.recycle(); bitmap = null; }
// clear the cache
view.setDrawingCacheEnabled(false);
return bmp;
}

public static Bitmap plicateBitmap(Bitmap bmpSrc)
{
if (null == bmpSrc)
{ return null; }

int bmpSrcWidth = bmpSrc.getWidth();
int bmpSrcHeight = bmpSrc.getHeight();

Bitmap bmpDest = Bitmap.createBitmap(bmpSrcWidth, bmpSrcHeight, Config.ARGB_8888); if (null != bmpDest) { Canvas canvas = new Canvas(bmpDest); final Rect rect = new Rect(0, 0, bmpSrcWidth, bmpSrcHeight);

canvas.drawBitmap(bmpSrc, rect, rect, null); }

return bmpDest;
}

❺ android createBitmap,如何设置背景色

此方法是根据int[] colors色素组创建Bitmap，你可以到这里看一下：http://blog.csdn.net/gaomatrix/article/details/6532468

❻ android 怎么创建bitmap.xml

首先创建工程，并在工程Build Path>Configure Build Path…>libraries 中选择“Add Externel JARs…”，选定 MapApi.jar，点击OK，这样就可以将高德地图Android API 库文件引入。

❼ android如何将图片的红色部分设为透明

public Bitmap transparentImage(Bitmap bmp) {
int m_ImageWidth, m_ImageHeigth;
int m_ImageWidth = bmp.getWidth();
int m_ImageHeigth = bmp.getHeight();
int[] m_BmpPixel = new int[m_ImageWidth * m_ImageHeigth];
bmp.getPixels(m_BmpPixel, 0, m_ImageWidth, 0, 0, m_ImageWidth,
m_ImageHeigth);

for (int i = 0; i < m_ImageWidth * m_ImageHeigth; i++) {
if ((m_BmpPixel[i] & 0x00ffffff) == 0x00ff0000) {
m_BmpPixel[i] = 0x00000000;
}
}

bmp.setPixels(m_BmpPixel, 0, m_ImageWidth, 0, 0, m_ImageWidth,
m_ImageHeigth);

return bmp;

}

❽ android 如何创建一张透明bitmap

使用一张全透明的PNG图片作为drawable，将它转换为bitmap即可。

❾ android UI中添加一张图片如何将这张图片中某一部分设为透明的

让ui设计师给你做图做成那样。我一般都是这样的。或者你要麻烦一点你就去了解一下caves画笔（不知道我是否拼写错误）估计那玩意可以把你的imageview里的某张图片的一部分设置透明度，我没用过，看人用过。

❿ android 实现毛玻璃透明效果有几种方法

1、如果系统的api在16以上，可以使用系统提供的方法直接处理图片

复制代码代码如下:

if (VERSION.SDK_INT > 16) {
Bitmap bitmap = sentBitmap.(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.To(bitmap);
return bitmap;
}

2、如果Api条件不满足，可以使用如下方法

复制代码代码如下:

@SuppressLint("NewApi")
public static Bitmap fastblur(Context context, Bitmap sentBitmap, int radius) {

Bitmap bitmap = sentBitmap.(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 temp = 256 * divsum;
int dv[] = new int[temp];
for (i = 0; i < temp; 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);
}

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