Camera2Source.java 文件源码

/**
 * Opens the camera and starts sending preview frames to the underlying detector.  The supplied
 * texture view is used for the preview so frames can be displayed to the user.
 *
 * @param textureView the surface holder to use for the preview frames
 * @param displayOrientation the display orientation for a non stretched preview
 * @throws IOException if the supplied texture view could not be used as the preview display
 */
@RequiresPermission(Manifest.permission.CAMERA)
public Camera2Source start(@NonNull AutoFitTextureView textureView, int displayOrientation) throws IOException {
    mDisplayOrientation = displayOrientation;
    if(ContextCompat.checkSelfPermission(mContext, Manifest.permission.CAMERA) == PackageManager.PERMISSION_GRANTED) {
        if (cameraStarted) {
            return this;
        }
        cameraStarted = true;
        startBackgroundThread();

        mProcessingThread = new Thread(mFrameProcessor);
        mFrameProcessor.setActive(true);
        mProcessingThread.start();

        mTextureView = textureView;
        if (mTextureView.isAvailable()) {
            setUpCameraOutputs(mTextureView.getWidth(), mTextureView.getHeight());
        }
    }
    return this;
}