java在曲面视图中打开前摄像头

Question

我遇到异常java.lang.RuntimeException: Fail to get camera info 在Camera.getCameraInfo(cameraId,info);

我的代码是：

public void surfaceCreated(SurfaceHolder holder) {
    int cameraId = -1;
    for(int i=0;i<Camera.getNumberOfCameras();i++){
        Camera.CameraInfo info = new Camera.CameraInfo();
        Camera.getCameraInfo(cameraId,info);
        if(info.facing== Camera.CameraInfo.CAMERA_FACING_FRONT){
            cameraId = i;
            break;
        }
    }
    camera = Camera.open(cameraId);
}

而舱单也有：

<uses-permission 安卓:name="安卓.permission.CAMERA" />

<uses-feature 安卓:name="安卓.hardware.camera" />
<uses-feature 安卓:name="安卓.hardware.camera.front" />
<uses-feature 安卓:name="安卓.hardware.camera.autofocus" />

遗漏了什么，我该如何解决？ 欢迎任何帮助

Answer 1

您得到异常是因为您将RAID初始化为-1，这是错误的。 并通过它获取摄像机信息

Camera.getCameraInfo(cameraId,info);

将cameraId初始化为0以摆脱异常

Answer 2

此方法将返回前摄像头Id：

private int getFrontCameraId(){
            int camId = -1;
            int numberOfCameras = Camera.getNumberOfCameras();
            Camera.CameraInfo ci = new Camera.CameraInfo();

            for(int i = 0;i < numberOfCameras;i++){
                Camera.getCameraInfo(i,ci);
                if(ci.facing == Camera.CameraInfo.CAMERA_FACING_FRONT){
                    camId = i;
                }
            }

            return camId;
        }

将此id传递到此处：camera=Camera.open(getFrontCameraId());

Answer 3

我改变了方法；以前我是实现SurfaceHolder.Callback，但现在我创建了它的对象

我将代码从SurfaceCreated移动到了onResume()

public void onResume() {
    super.onResume();
    for(int i=0;i<Camera.getNumberOfCameras();i++){
        Camera.CameraInfo info = new Camera.CameraInfo();
        Camera.getCameraInfo(i,info);
        if(info.facing== Camera.CameraInfo.CAMERA_FACING_FRONT){
            cameraId = i;
            break;
        }
    }
    camera=Camera.open(cameraId);
    camera.startPreview();
}

回调的对象是：

SurfaceHolder.Callback surfaceCallback=new SurfaceHolder.Callback() {
    public void surfaceCreated(SurfaceHolder holder) {
        // no-op   wait until surfaceChanged()

    }
    public void surfaceChanged(SurfaceHolder holder,
                               int format, int width,
                               int height) {
        Camera.Parameters parameters=camera.getParameters();
        Camera.Size size=getBestPreviewSize(width, height,
                    parameters);
        Display display = ((WindowManager)getSystemService(WINDOW_SERVICE)).getDefaultDisplay();

        if (size!=null) {
            parameters.setPreviewSize(size.width, size.height);
            camera.setParameters(parameters);
            camera.setDisplayOrientation(90);
            cameraConfigured=true;
        }
        camera.startPreview();
    }
    public void surfaceDestroyed(SurfaceHolder holder) {
        // no-op
    }
};

这解决了我的问题