CodeScanner.java 文件源码

/**
 * Camera to use
 *
 * @param cameraId Camera id (between {@code 0} and
 *                 {@link Camera#getNumberOfCameras()} - {@code 1})
 */
@MainThread
public void setCamera(int cameraId) {
    mInitializeLock.lock();
    try {
        if (mCameraId != cameraId) {
            mCameraId = cameraId;
            if (mInitialized) {
                boolean previewActive = mPreviewActive;
                releaseResources();
                if (previewActive) {
                    initialize();
                }
            }
        }
    } finally {
        mInitializeLock.unlock();
    }
}