录制视频时想获取手机支持的录制视频的分辨率，使用代码如下：

List<Camera.Size> videoSize = camera.getParameters().getSupportedVideoSizes();
Iterator<Camera.Size> itos = videoSize.iterator();
        while (itos.hasNext()) {
            Camera.Size curSize = itos.next();
            int curSupporSize = curSize.width * curSize.height;
            int fixPictrueSize = setFixPictureWidth * setFixPictureHeight;
            if (curSupporSize > fixPictrueSize) {
                setFixPictureWidth = curSize.width;
                setFixPictureHeight = curSize.height;
            }
        }
mediaRecorder.setVideoSize(setFixPictureWidth,
        setFixPictureHeight);

出现了两次错误，一次是录制视频时调用camera.getParameters()时报parameters is empty，这是由于在camera.unlock()之后调用了该函数，将其在unlock之前获取就ok了。
还有一个错误就是setVideoSize called in a invalid state 1，进入setVideoSize函数中可以发现抛出异常的条件说明

 /**
     * Sets the width and height of the video to be captured.  Must be called
     * after setVideoSource(). Call this after setOutFormat() but before
     * prepare().
     *
     * @param width the width of the video to be captured
     * @param height the height of the video to be captured
     * @throws IllegalStateException if it is called after
     * prepare() or before setOutputFormat()
     */
    public native void setVideoSize(int width, int height)
            throws IllegalStateException;

IllegalStateException if it is called after prepare() or before setOutputFormat()表示如果setVideoSize在prepare() 之后或者setOutputFormat()之前调用的话就会出现该异常，即是说要求setVideoSize函数在prepare()之前以及setOutputFormat()之后调用。
查了下代码，发现我调用setVideoSize竟然是在setOutputFormat()之前，改到setOutputFormat()之后就ok了。