android图片二值化并显示在ImageView

请各位大侠帮忙。是个按钮的监听实现。下面得到图片的方法一和二 结果是一样的吗？？
ImageView上只显示Bitmap格式的图片吗？？？
怎么把像素数组转化成Bitmap并显示在ImageView上？？
万分感谢！！


/*得到图片的大小 一*/
BitmapFactory.Options bmOptions = new BitmapFactory.Options();
bmOptions.inJustDecodeBounds = true;//dont save pic to memory ,only get width and height
Bitmap bitmap = BitmapFactory.decodeFile(mCurrentPhotoPath, bmOptions);
//the resulting width and height of the bitmap
int photoW = bmOptions.outWidth;
int photoH = bmOptions.outHeight;

/*得到图片的大小 二*/

BufferedImage image = null;
File f = new File(mCurrentPhotoPath);

try {
image=ImageIO.read(f);
} catch (IOException e) {

e.printStackTrace();
}
int iw = image.getWidth();
int ih = image.getHeight();
// 上面两种方法得到的图片的大小是一样的吗？？

/*存储图片*/

int pixels [] = new int [iw*ih]; //如果想存储到二位数组中，怎么实现呢？？

/*图片做黑白处理*/
int grey = 100;
// 对图像进行二值化处理，Alpha值保持不变
ColorModel cm = ColorModel.getRGBdefault();
for (int i = 0; i < iw * ih; i++) {
int red, green, blue;
int alpha = cm.getAlpha(pixels);
if (cm.getRed(pixels) > grey) {
red = 255;
} else {
red = 0;
}
if (cm.getGreen(pixels) > grey) {
green = 255;
} else {
green = 0;

}
if (cm.getBlue(pixels) > grey) {
blue = 255; } else { blue = 0; }
pixels = alpha << 24 | red << 16 | green << 8 | blue;

/*图片显示在ImageView上*/
bmOptions.inJustDecodeBounds = false;
bitmap = BitmapFactory.decodeFile(mCurrentPhotoPath, bmOptions);
bitmap.setPixels(pixels, 0, photoW, 0, 0, photoW, photoH);

mImageView.setImageBitmap(bitmap);
mImageView.setVisibility(View.VISIBLE);




一点按钮就异常退出了
































































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