至于如何在项目中如何添加OpenCv的SDK在此不再赘述:我引入的OpenCv-SDK版本为OpenCV-3.1.0-android-sdk
在Activity中实现CameraBridgeViewBase.CvCameraViewListener2接口并重写其方法,在
Mat onCameraFrame(CameraBridgeViewBase.CvCameraViewFrame inputFrame)方法中可以使用OpenCv的保存图片的方法,如下:
Imgcodecs.imwrite("/storage/emulated/0/" + "OpenCvimwrite.jpg", inputFrame.rgba());
方法参数为:1.图片名称(包括路径)2.Mat类型的数据注:此方法保存的图片分辨率和预览分辨率相同(即Camera的PreviewSize属性)
另外此图片可能比较模糊,通过查看JavaCameraView类中的Boolean initializeCamera(int width,int height)方法发现有以下两行代码:
int size = mFrameWidth * mFrameHeight;
size = size * ImageFormat.getBitsPerPixel(params.getPreviewFormat()) / 8;
将size改为 size = size * ImageFormat.getBitsPerPixel(params.getPreviewFormat());
照片的效果会稍微好一点。下面切入主题,添加保存照片的方法:
在JavaCameraView类中添加方法:
public void tackPhoto(final String name) {
if (mCamera != null) {
mCamera.takePicture(null, null, new Camera.PictureCallback() {
@Override
public void onPictureTaken(byte[] data, Camera camera) {
Bitmap bmp = BitmapFactory.decodeByteArray(data, 0, data.length);
saveMyBitmap(bmp, name);
}
});
}
public void saveMyBitmap(Bitmap mBitmap, String photoName) {
if (isMediaMounted()) {
String SDCardPath = Environment.getExternalStorageDirectory().getAbsolutePath().toString();
createFileDir(SDCardPath + File.separator + "OpenCv");
String FilePath = SDCardPath + File.separator + "OpenCv" + File.separator + photoName + ".jpg";
File file = new File(FilePath);
// "/storage/emulated/0/OpenCv" + "OpenCv.jpg",
BufferedOutputStream bos = null;
try {
FileOutputStream fos = new FileOutputStream(file);
bos = new BufferedOutputStream(fos);
mBitmap.compress(Bitmap.CompressFormat.JPEG, 100, bos);
bos.flush();
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
if (mBitmap != null) {
mBitmap.recycle();
}
bos.close();
} catch (IOException e) {
e.printStackTrace();
}
}
} else {
Log.e(TAG, "saveMyBitmap: 没有挂载内存卡,无法保存图片");
}
}
/**
* SD卡是否挂载
*
* @return
*/
public static boolean isMediaMounted() {
String status = Environment.getExternalStorageState();
if (status.equals(Environment.MEDIA_MOUNTED)) {
return true;
} else {
return false;
}
}
这样在Activity中就可以调用JavaCameraView的tackPhoto()方法拍照了。