android創建透明bitmap_android中怎麼把一個圖片設置透明化

❶ android bitmap alpha 什麼是圖片的alpha值,alpha值有什麼作用

這個指的就是透明度，android裡面xml是八位16進制數表示，譬如#ff123a11 前兩位是透明度,後六位是顏色數值，也可以直接使用後6位，這樣前兩位的數值就默認為ff即為白色，前兩位就是alpha值

❷ android 文本框中加入多個bitmap圖片, 點擊bitmap 彈出對話框該怎麼寫呢是不是要獲取透明的焦點

最簡單的辦法是，重寫一個文本框，bitmap的顯示採用imageSpan的方式設置到文本中，點擊彈出對話框採用獲取點擊時觸摸的文本的位置判斷為在圖片位置即彈出對話框。

❸ android中怎麼把一個圖片設置透明化。

直接用一下代碼可以讓圖片變得透明，具體效果自己看看吧：

java">
/**


*圖片透明度處理

*

*@paramsourceImg

*原始圖片

*@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());

//獲得圖片的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怎麼生成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生成畫布
Canvas canvas = new Canvas(bitmap);

//把view中的內容繪制在畫布上
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,如何設置背景色

此方法是根據int[] colors色素組創建Bitmap，你可以到這里看一下：http://blog.csdn.net/gaomatrix/article/details/6532468

❻ android 怎麼創建bitmap.xml

首先創建工程，並在工程Build Path>Configure Build Path…>libraries 中選擇「Add Externel JARs…」，選定 MapApi.jar，點擊OK，這樣就可以將高德地圖Android API 庫文件引入。

❼ android如何將圖片的紅色部分設為透明

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 如何創建一張透明bitmap

使用一張全透明的PNG圖片作為drawable，將它轉換為bitmap即可。

❾ android UI中添加一張圖片如何將這張圖片中某一部分設為透明的

讓ui設計師給你做圖做成那樣。我一般都是這樣的。或者你要麻煩一點你就去了解一下caves畫筆（不知道我是否拼寫錯誤）估計那玩意可以把你的imageview里的某張圖片的一部分設置透明度，我沒用過，看人用過。

❿ android 實現毛玻璃透明效果有幾種方法

1、如果系統的api在16以上，可以使用系統提供的方法直接處理圖片

復制代碼代碼如下:

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條件不滿足，可以使用如下方法

復制代碼代碼如下:

@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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