问题：如何解决Android相机2的问题并提供代码示例？

解决方法：

1. 确保添加相机权限到AndroidManifest.xml文件中：

2. 创建一个相机管理器类来管理相机的打开和关闭：

public class CameraManager {
    private CameraDevice mCameraDevice;

    private CameraManager() {
    }

    public static CameraManager getInstance() {
        return SingletonHolder.INSTANCE;
    }

    private static class SingletonHolder {
        private static final CameraManager INSTANCE = new CameraManager();
    }

    public void openCamera(Context context, String cameraId, CameraDevice.StateCallback callback) {
        CameraManager manager = (CameraManager) context.getSystemService(Context.CAMERA_SERVICE);
        try {
            if (ActivityCompat.checkSelfPermission(context, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
                return;
            }
            manager.openCamera(cameraId, callback, null);
        } catch (CameraAccessException e) {
            e.printStackTrace();
        }
    }

    public void closeCamera() {
        if (mCameraDevice != null) {
            mCameraDevice.close();
            mCameraDevice = null;
        }
    }

    public CameraDevice getCameraDevice() {
        return mCameraDevice;
    }

    public void setCameraDevice(CameraDevice cameraDevice) {
        mCameraDevice = cameraDevice;
    }
}

3. 创建一个相机回调类来处理相机的状态变化和图像捕获：

public class CameraDeviceCallback extends CameraDevice.StateCallback {
    @Override
    public void onOpened(CameraDevice camera) {
        CameraManager.getInstance().setCameraDevice(camera);
    }

    @Override
    public void onDisconnected(CameraDevice camera) {
        camera.close();
        CameraManager.getInstance().setCameraDevice(null);
    }

    @Override
    public void onError(CameraDevice camera, int error) {
        camera.close();
        CameraManager.getInstance().setCameraDevice(null);
    }
}

4. 在Activity或Fragment中使用相机：

public class CameraActivity extends AppCompatActivity {
    private static final String TAG = "CameraActivity";

    private CameraDevice mCameraDevice;
    private CameraCaptureSession mCaptureSession;

    private SurfaceView mPreviewSurfaceView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_camera);

        mPreviewSurfaceView = findViewById(R.id.preview_surface_view);

        mPreviewSurfaceView.getHolder().addCallback(new SurfaceHolder.Callback() {
            @Override
            public void surfaceCreated(SurfaceHolder surfaceHolder) {
                openCamera();
            }

            @Override
            public void surfaceChanged(SurfaceHolder surfaceHolder, int i, int i1, int i2) {
            }

            @Override
            public void surfaceDestroyed(SurfaceHolder surfaceHolder) {
                closeCamera();
            }
        });
    }

    private void openCamera() {
        CameraManager.getInstance().openCamera(this, cameraId, new CameraDeviceCallback());
    }

    private void closeCamera() {
        CameraManager.getInstance().closeCamera();
    }

    private void createCaptureSession() {
        // 创建一个用于预览的CaptureRequest.Builder
        CaptureRequest.Builder previewRequestBuilder = mCameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW);
        
        // 设置预览的Surface对象
        previewRequestBuilder.addTarget(mPreviewSurfaceView.getHolder().getSurface());

        try {
            mCameraDevice.createCaptureSession(Arrays.asList(mPreviewSurfaceView.getHolder().getSurface()), new CameraCaptureSession.StateCallback() {
                @Override
                public void onConfigured(CameraCaptureSession cameraCaptureSession) {
                    if (mCameraDevice == null) {
                        return;
                    }

                    mCaptureSession = cameraCaptureSession;

                    try {
                        // 开始预览
                        mCaptureSession.setRepeatingRequest(previewRequestBuilder.build(), null, null);
                    } catch (CameraAccessException e) {
                        e.printStackTrace();
                    }
                }

                @Override
                public void onConfigureFailed(CameraCaptureSession cameraCaptureSession) {
                    Log.e(TAG, "CameraCaptureSession configure failed");
                }
            }, null);
        } catch (CameraAccessException e) {
            e.printStackTrace();
        }
    }
}

以上是解决Android相机2问题的基本步骤和代码示例。根据具体的需求，你可能还需要添加其他功能，例如拍照、录像等。希望能对你有所帮助！