相关疑难解决方法(0)

我从LogCat收到这些错误:

10-30 00:31:51.494: D/CameraHal(1205): CameraHal setOverlay/1/00000000/00000000
10-30 00:31:51.494: E/CameraHal(1205): Trying to set overlay, but overlay is null!, line:3472
10-30 00:31:51.494: W/CameraService(1205): Overlay create failed - retrying
...
10-30 00:31:52.526: E/CameraService(1205): Overlay Creation Failed!
...
10-30 00:31:52.588: E/AndroidRuntime(5040): FATAL EXCEPTION: main
10-30 00:31:52.588: E/AndroidRuntime(5040): java.lang.RuntimeException: startPreview failed
10-30 00:31:52.588: E/AndroidRuntime(5040):     at android.hardware.Camera.startPreview(Native Method)
10-30 00:31:52.588: E/AndroidRuntime(5040):     at com.matthewmitchell.nightcam.CameraSurfaceView.surfaceCreated(CameraSurfaceView.java:47)
10-30 00:31:52.588: E/AndroidRuntime(5040):     at android.view.SurfaceView.updateWindow(SurfaceView.java:544)
10-30 00:31:52.588: E/AndroidRuntime(5040):     at android.view.SurfaceView.dispatchDraw(SurfaceView.java:341)
10-30 00:31:52.588: E/AndroidRuntime(5040):     at android.view.ViewGroup.drawChild(ViewGroup.java:1638)
10-30 00:31:52.588: E/AndroidRuntime(5040):     at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1367)
10-30 00:31:52.588: E/AndroidRuntime(5040): …

可能重复:
Android相机无法使用.startPreview失败

我试图在自定义SurfaceView中设置相机预览,但每次执行初始化方法时都会出现异常.

以下是相机预览初始化的代码:

private void init(Context context)
{
    setFocusable(true);
    mRecording = false;
    fileRW = new FileReaderWriter();
    frameCount = 0;
    if(mCamera == null)
    {
        mCamera = Camera.open();
    }
    Parameters parameters = mCamera.getParameters();
    parameters.setPictureFormat(PixelFormat.JPEG);
    mCamera.setParameters(parameters);
    try {
        mCamera.setPreviewDisplay(surfaceHolder);
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    mCamera.startPreview();

}

每次我尝试执行该方法时,该行都会mCamera.setPreviewDisplay(surfaceHolder);抛出异常(setPreviewDisplay failed).

有谁知道什么可能是错的？我非常感谢你的任何帮助.

谢谢!`