在previewFrame相机不叫 [英] Camera onPreviewFrame not called

问题描述

（Camera.start prevew（））。现在的问题是，如果我做出previewFrame使用MediaRecorder录像不会被调用了。

when using the Camera.PreviewCallback implementation the onPreviewFrame is called without problem after initializing camera and starting preview (Camera.startPrevew()). The problem is if I make a video recording using MediaRecorder onPreviewFrame does not get called any more.

据我所知，使用MediaRecorder录制视频时停止摄像机。previewCallback，但为什么不能重新开始？

I understand that when using MediaRecorder to record video stops the Camera.PreviewCallback, but why can't it be restarted?

我曾尝试复位相机preVIEW回调（套previewCallback（回调））并重新启动启动preVIEW，但同时我有一个preVIEW有没有通话previewFrame。

I have tried resetting the camera preview callback (setPreviewCallback(callback)) and restarting startPreview, but while I have a preview there is no call to onPreviewFrame.

推荐答案

您一定要调用surfaceChanged方法设置previewCallback，不仅在surfaceCreated。

You must to call setPreviewCallback in surfaceChanged method, not only in surfaceCreated.

public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
if (mHolder.getSurface() == null){
  return;
}

try {
    mCamera.stopPreview();
} catch (Exception e){
  // ignore: tried to stop a non-existent preview
}

try {
    mCamera.setPreviewCallback(this);
    mCamera.setPreviewDisplay(mHolder);
    mCamera.startPreview();

} catch (Exception e){
    Log.d(TAG, "Error starting camera preview: " + e.getMessage());
}
}

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