使用自定义Camera实现简单拍照功能_flutter 自定义相机-优快云博客

本文链接：https://blog.youkuaiyun.com/ww55555577/article/details/62041140

本文介绍了如何使用自定义的SurfaceView和Camera类在Android中实现基本的拍照功能。通过在SurfaceView创建时初始化Camera，设置参数，以及在销毁时释放资源，完成拍照功能的实现。在Activity中调用并添加相应权限即可运行这个简单的拍照Demo。

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闲来无事，就把之前用自定义Camera实现的简单拍照功能记录一下。
Camera类在5.0以后不推荐使用了，取而代之的是android.hardware.camera2包下的类，本文使用Camera。
我们首先自定义一个View去继承SurfaceView:

public class CameraSurfaceView extends SurfaceView implements SurfaceHolder.Callback, Camera.AutoFocusCallback {
   
    private SurfaceHolder mHolder;
    private Camera mCamera;
    private static final int ORIENTATION = 90;
    private int mScreenWidth;
    private int mScreenHeight;
    private boolean isOpen;

    public CameraSurfaceView(Context context, AttributeSet attrs) {
        super(context, attrs);
        getScreenMatrix(context);
        mHolder = getHolder();
        mHolder.addCallback(this);
        mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
    }

    private void getScreenMatrix(Context context) {
        WindowManager WM = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
        DisplayMetrics outMetrics = new DisplayMetrics();
        WM.getDefaultDisplay().getMetrics(outMetrics);
        mScreenWidth = outMetrics.widthPixels;
        mScreenHeight = outMetrics.heightPixels;
    }

    public void takePicture(Camera.ShutterCallback mShutterCallback, Camera.PictureCallback rawPictureCallback, Camera.PictureCallback jpegPictureCallback) {
        if (mCamera != null)
            mCamera.takePicture(mShutterCallback, rawPictureCallback, jpegPictureCallback);
    }

    public void startPreview() {
        mCamera.startPreview();
    }

    @Override
    public void surfaceCreated(SurfaceHolder holder) {
        if (!checkCameraHardware(getContext()))
            return;
        if (mCamera == null) {
            isOpen = safeCameraOpen(Camera.CameraInfo.CAMERA_FACING_BACK);
        }
        if (!isOpen) {
            return;
        }
        mCamera.setDisplayOrientation(ORIENTATION);
        try {
            mCamera.setPreviewDisplay(holder);

        } catch (IOException e) {
            e.printStackTrace();
        }
    }