android将彩图转为黑白_Android Bitmap保存为.bmp格式 图像转化为黑白图片

/**

*把一个View的对象转换成bitmap

*/

staticBitmapgetViewBitmap(Viewv){

v.clearFocus();

v.setPressed(false);

//能画缓存就返回false

booleanwillNotCache=v.willNotCacheDrawing();

v.setWillNotCacheDrawing(false);

intcolor=v.getDrawingCacheBackgroundColor();

v.setDrawingCacheBackgroundColor(0);

if(color!=0){

v.destroyDrawingCache();

}

v.buildDrawingCache();

BitmapcacheBitmap=v.getDrawingCache();

if(cacheBitmap==null){

Log.e("BtPrinter","failedgetViewBitmap("+v+")",newRuntimeException());

returnnull;

}

Bitmapbitmap=Bitmap.createBitmap(cacheBitmap);

//Restoretheview

v.destroyDrawingCache();

v.setWillNotCacheDrawing(willNotCache);

v.setDrawingCacheBackgroundColor(color);

returnbitmap;

}

/**

*将彩色图转换为黑白图

*

*@param位图

*@return返回转换好的位图

*/

publicstaticBitmapconvertToBlackWhite(Bitmapbmp){

intwidth=bmp.getWidth();//获取位图的宽

intheight=bmp.getHeight();//获取位图的高

int[]pixels=newint[width*height];//通过位图的大小创建像素点数组

bmp.getPixels(pixels,0,width,0,0,width,height);

intalpha=0xFF<

for(inti=0;i

for(intj=0;j

intgrey=pixels[width*i+j];

intred=((grey&0x00FF0000)>>16);

intgreen=((grey&0x0000FF00)>>8);

intblue=(grey&0x000000FF);

grey=(int)(red*0.3+green*0.59+blue*0.11);

grey=alpha|(grey<

pixels[width*i+j]=grey;

}

}

BitmapnewBmp=Bitmap.createBitmap(width,height,Config.RGB_565);

newBmp.setPixels(pixels,0,width,0,0,width,height);

BitmapresizeBmp=ThumbnailUtils.extractThumbnail(newBmp,380,460);

returnresizeBmp;

}

/**

*将Bitmap存为.bmp格式图片

*@parambitmap

*/

privatevoidsaveBmp(Bitmapbitmap){

if(bitmap==null)

return;

//位图大小

intnBmpWidth=bitmap.getWidth();

intnBmpHeight=bitmap.getHeight();

//图像数据大小

intbufferSize=nBmpHeight*(nBmpWidth*3+nBmpWidth%4);

try{

//存储文件名

Stringfilename="/sdcard/test.bmp";

Filefile=newFile(filename);

if(!file.exists()){

file.createNewFile();

}

FileOutputStreamfileos=newFileOutputStream(filename);

//bmp文件头

intbfType=0x4d42;

longbfSize=14+40+bufferSize;

intbfReserved1=0;

intbfReserved2=0;

longbfOffBits=14+40;

//保存bmp文件头

writeWord(fileos,bfType);

writeDword(fileos,bfSize);

writeWord(fileos,bfReserved1);

writeWord(fileos,bfReserved2);

writeDword(fileos,bfOffBits);

//bmp信息头

longbiSize=40L;

longbiWidth=nBmpWidth;

longbiHeight=nBmpHeight;

intbiPlanes=1;

intbiBitCount=24;

longbiCompression=0L;

longbiSizeImage=0L;

longbiXpelsPerMeter=0L;

longbiYPelsPerMeter=0L;

longbiClrUsed=0L;

longbiClrImportant=0L;

//保存bmp信息头

writeDword(fileos,biSize);

writeLong(fileos,biWidth);

writeLong(fileos,biHeight);

writeWord(fileos,biPlanes);

writeWord(fileos,biBitCount);

writeDword(fileos,biCompression);

writeDword(fileos,biSizeImage);

writeLong(fileos,biXpelsPerMeter);

writeLong(fileos,biYPelsPerMeter);

writeDword(fileos,biClrUsed);

writeDword(fileos,biClrImportant);

//像素扫描

bytebmpData[]=newbyte[bufferSize];

intwWidth=(nBmpWidth*3+nBmpWidth%4);

for(intnCol=0,nRealCol=nBmpHeight-1;nCol

for(intwRow=0,wByteIdex=0;wRow

intclr=bitmap.getPixel(wRow,nCol);

bmpData[nRealCol*wWidth+wByteIdex]=(byte)Color.blue(clr);

bmpData[nRealCol*wWidth+wByteIdex+1]=(byte)Color.green(clr);

bmpData[nRealCol*wWidth+wByteIdex+2]=(byte)Color.red(clr);

}

fileos.write(bmpData);

fileos.flush();

fileos.close();

}catch(FileNotFoundExceptione){

e.printStackTrace();

}catch(IOExceptione){

e.printStackTrace();

}

}

protectedvoidwriteWord(FileOutputStreamstream,intvalue)throwsIOException{

byte[]b=newbyte[2];

b[0]=(byte)(value&0xff);

b[1]=(byte)(value>>8&0xff);

stream.write(b);

}

protectedvoidwriteDword(FileOutputStreamstream,longvalue)throwsIOException{

byte[]b=newbyte[4];

b[0]=(byte)(value&0xff);

b[1]=(byte)(value>>8&0xff);

b[2]=(byte)(value>>16&0xff);

b[3]=(byte)(value>>24&0xff);

stream.write(b);

}

protectedvoidwriteLong(FileOutputStreamstream,longvalue)throwsIOException{

byte[]b=newbyte[4];

b[0]=(byte)(value&0xff);

b[1]=(byte)(value>>8&0xff);

b[2]=(byte)(value>>16&0xff);

b[3]=(byte)(value>>24&0xff);

stream.write(b);

}