前后摄像头不能同时打开

Question

我正在尝试打开我的前后相机，但只有一个正在打开，我想同时打开它们。

代码如下：

public class MainActivity extends Activity implements SurfaceHolder.Callback {
    TextView testView;

    static Camera camera = null;
    SurfaceView surfaceView, surfaceView1;
    SurfaceHolder surfaceHolder, surfaceHolder1;

    PictureCallback rawCallback;
    ShutterCallback shutterCallback;
    PictureCallback jpegCallback;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        surfaceView = (SurfaceView) findViewById(R.id.surfaceView);
        surfaceHolder = surfaceView.getHolder();

        surfaceView1 = (SurfaceView) findViewById(R.id.surfaceView1);
        surfaceHolder1 = surfaceView1.getHolder();

        // Install a SurfaceHolder.Callback so we get notified when the
        // underlying surface is created and destroyed.
        surfaceHolder.addCallback(this);
        surfaceHolder1.addCallback(this);

        // deprecated setting, but required on Android versions prior to 3.0
        surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_HARDWARE);
        surfaceHolder1.setType(SurfaceHolder.SURFACE_TYPE_HARDWARE);

        // for saving image

        jpegCallback = new PictureCallback() {
            @SuppressLint({ "SdCardPath", "ShowToast" })
            public void onPictureTaken(byte[] data, Camera camera) {
                FileOutputStream outStream = null;
                try {
                    outStream = new FileOutputStream(String.format(
                            "/sdcard/%d.jpg", System.currentTimeMillis()));
                    outStream.write(data);
                    outStream.close();
                    Log.d("Log", "onPictureTaken - wrote bytes: " + data.length);
                } catch (FileNotFoundException e) {
                    e.printStackTrace();
                } catch (IOException e) {
                    e.printStackTrace();
                } finally {
                }
                Toast.makeText(getApplicationContext(), "Picture Saved", 2000)
                        .show();
                refreshCamera1();
                refreshCamera();

            }
        };

    }

    public void captureImage(View v) throws IOException {
        // take the picture
        camera.takePicture(null, null, jpegCallback);

    }

    public void refreshCamera() {
        if (surfaceHolder.getSurface() == null) {
            // preview surface does not exist
            return;
        }

        // stop preview before making changes
        try {
            camera = camera.open();
        } catch (Exception e) {
            System.out.println("exception on surface 2 is >>>>>" + e);
        }

        // set preview size and make any resize, rotate or
        // reformatting changes here
        // start preview with new settings
        try {
            camera.setPreviewDisplay(surfaceHolder);
            camera.startPreview();
        } catch (Exception e) {

        }

    }

    public void refreshCamera1() {
        if (surfaceHolder1.getSurface() != null) {
            // preview surface does not exist
            return;
        }

        // stop preview before making changes
        try {
            camera.open();
        } catch (Exception e) {
            System.out.println("exception on surface 1 is >>>>>" + e);
        }

        // set preview size and make any resize, rotate or
        // reformatting changes here
        // start preview with new settings
        try {
            camera.setPreviewDisplay(surfaceHolder1);
            camera.startPreview();
        } catch (Exception e) {

        }

    }

    public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
        // Now that the size is known, set up the camera parameters and begin
        // the preview.
        refreshCamera1();
        refreshCamera();

    }

    public void surfaceCreated(SurfaceHolder holder) {
        try {
            // open the camera

            // camera = Camera.open();
            boolean found = false;
            int i;
            for (i = 0; i < Camera.getNumberOfCameras(); i++) {
                Camera.CameraInfo newInfo = new Camera.CameraInfo();
                Camera.getCameraInfo(i, newInfo);
                if (newInfo.facing == CameraInfo.CAMERA_FACING_FRONT) {
                    found = true;
                    // break;
                }
                if (found == true) {

                    camera = Camera.open(i);
                }
            }

        } catch (RuntimeException e) {
            // check for exceptions
            System.err.println(e);
            return;
        }
        Camera.Parameters param;
        param = camera.getParameters();

        // modify parameter
        param.setPreviewSize(352, 288);
        camera.setParameters(param);
        try {
            // The Surface has been created, now tell the camera where to draw
            // the preview.
            camera.setPreviewDisplay(surfaceHolder);
            camera.setPreviewDisplay(surfaceHolder1);
            camera.startPreview();
        } catch (Exception e) {
            // check for exceptions
            System.err.println(e);
            return;
        }
    }

    public void surfaceDestroyed(SurfaceHolder holder) {
        // stop preview and release camera
        camera.stopPreview();
        camera.release();
        camera = null;
    }
}

我的XML文件中有两个SurfaceView，当我运行应用程序时，只有一个surfaceView打开而另一个surfaceView是空白的 对此有任何帮助我被困在这里。 谢谢。