相机2使用。当我调用 closeCamera 时,显示最后看到的帧而不是黑屏

camera2 used. When I call closeCamera, last seen frame is displayed instead of black screen

我实现了 3 种状态的相机:自拍(正面)、背面和关闭。

除 'off' 状态外,一切正常。

我正在使用 camera2,它显示在 TextureView 上:

<TextureView
    android:id="@+id/texture_view"
    android:layout_width="match_parent"
    android:layout_height="match_parent"/>

Expected: When 'off' state is chosen, I would like to close the camera and show black screen .

实际:在'off'状态下,显示相机最后看到的帧。

closeCamera 方法:

private void closeCamera() {
    try {
        mCameraOpenCloseLock.acquire();
        closePreviewSession();
        if (null != mCameraDevice) {
            mCameraDevice.close();
            mCameraDevice = null;
        }
        if (null != mMediaRecorder) {
            mMediaRecorder.release();
            mMediaRecorder = null;
        }
    } catch (InterruptedException e) {
        throw new RuntimeException("Interrupted while trying to lock camera closing.");
    } finally {
        mCameraOpenCloseLock.release();
    }
}


private void closePreviewSession() {
    if (mPreviewSession != null) {
        mPreviewSession.close();
        mPreviewSession = null;
    }
}

知道如何导致 'closeCamera' 显示黑屏吗?

最简单的选择可能是在关闭相机时用单独的黑色视图覆盖 TextureView。

或者在不使用时隐藏 TextureView。