调用android的camera2获取到的原始图像数据是YUV_420_8888,是无法直接存jpg的，所以需要先利用renderscript进行转换
public static void onImageAvailable(Context context,Image image)
{
try {
// Get the YUV data
// final Image image = reader.acquireLatestImage();
final ByteBuffer yuvBytes = imageToByteBuffer(image);
// Convert YUV to RGB
final RenderScript rs = RenderScript.create(context);
final Bitmap bitmap = Bitmap.createBitmap(image.getWidth(), image.getHeight(), Bitmap.Config.ARGB_8888);
final Allocation allocationRgb = Allocation.createFromBitmap(rs, bitmap);
final Allocation allocationYuv = Allocation.createSized(rs, Element.U8(rs), yuvBytes.array().length);
allocationYuv.copyFrom(yuvBytes.array());
ScriptIntrinsicYuvToRGB scriptYuvToRgb = ScriptIntrinsicYuvToRGB.create(rs, Element.U8_4(rs));
scriptYuvToRgb.setInput(allocationYuv);
scriptYuvToRgb.forEach(allocationRgb);
allocationRgb.copyTo(bitmap);
String path = context.getExternalFilesDir("/pictures").getAbsolutePath();
File file = new File(path+"/"+System.currentTimeMillis()+".jpg");
OutputStream outputStream = new FileOutputStream(file);
bitmap.compress(Bitmap.CompressFormat.JPEG, 100, outputStream);
outputStream.flush();
outputStream.close();
// Release
bitmap.recycle();
allocationYuv.destroy();
allocationRgb.destroy();
rs.destroy();
image.close();
}catch (Exception e){
e.printStackTrace();
}
}
public static ByteBuffer imageToByteBuffer(final Image image)
{
final Rect crop = image.getCropRect();
final int width = crop.width();
final int height = crop.height();
final Image.Plane[] planes = image.getPlanes();
final byte[] rowData = new byte[planes[0].getRowStride()];
final int bufferSize = width * height * ImageFormat.getBitsPerPixel(ImageFormat.YUV_420_888) / 8;
final ByteBuffer output = ByteBuffer.allocateDirect(bufferSize);
int channelOffset = 0;
int outputStride = 0;
for (int planeIndex = 0; planeIndex < 3; planeIndex++)
{
if (planeIndex == 0)
{
channelOffset = 0;
outputStride = 1;
}
else if (planeIndex == 1)
{
channelOffset = width * height + 1;
outputStride = 2;
}
else if (planeIndex == 2)
{
channelOffset = width * height;
outputStride = 2;
}
final ByteBuffer buffer = planes[planeIndex].getBuffer();
final int rowStride = planes[planeIndex].getRowStride();
final int pixelStride = planes[planeIndex].getPixelStride();
final int shift = (planeIndex == 0) ? 0 : 1;
final int widthShifted = width >> shift;
final int heightShifted = height >> shift;
buffer.position(rowStride * (crop.top >> shift) + pixelStride * (crop.left >> shift));
for (int row = 0; row < heightShifted; row++)
{
final int length;
if (pixelStride == 1 && outputStride == 1)
{
length = widthShifted;
buffer.get(output.array(), channelOffset, length);
channelOffset += length;
}
else
{
length = (widthShifted - 1) * pixelStride + 1;
buffer.get(rowData, 0, length);
for (int col = 0; col < widthShifted; col++)
{
output.array()[channelOffset] = rowData[col * pixelStride];
channelOffset += outputStride;
}
}
if (row < heightShifted - 1)
{
buffer.position(buffer.position() + rowStride - length);
}
}
}
return output;
}
