以下是一个示例代码，用于在安卓设备上检测人物并开始游戏。

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Rect;
import android.hardware.Camera;
import android.hardware.Camera.PreviewCallback;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;

public class CharacterDetectionView extends SurfaceView implements SurfaceHolder.Callback, PreviewCallback {

    private static final String TAG = "CharacterDetectionView";

    private SurfaceHolder mHolder;
    private Camera mCamera;
    private Bitmap mCharacterBitmap;

    public CharacterDetectionView(Context context) {
        super(context);
        mHolder = getHolder();
        mHolder.addCallback(this);
    }

    @Override
    public void surfaceCreated(SurfaceHolder holder) {
        try {
            mCamera = Camera.open();
            mCamera.setPreviewDisplay(holder);
            mCamera.setDisplayOrientation(90);
            mCamera.setPreviewCallback(this);
        } catch (Exception e) {
            Log.e(TAG, "Error setting up the camera: " + e.getMessage());
        }
    }

    @Override
    public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
        // Start the camera preview
        mCamera.startPreview();
    }

    @Override
    public void surfaceDestroyed(SurfaceHolder holder) {
        // Release the camera resources
        mCamera.stopPreview();
        mCamera.release();
        mCamera = null;
    }

    @Override
    public void onPreviewFrame(byte[] data, Camera camera) {
        // Convert the preview frame data to a bitmap
        Camera.Size previewSize = camera.getParameters().getPreviewSize();
        mCharacterBitmap = BitmapFactory.decodeByteArray(data, 0, data.length);
        mCharacterBitmap = Bitmap.createScaledBitmap(mCharacterBitmap, previewSize.width, previewSize.height, false);

        // Perform character detection logic here
        Rect characterRect = detectCharacter(mCharacterBitmap);

        // Start the game if character is detected
        if (characterRect != null) {
            startGame();
        }
    }

    private Rect detectCharacter(Bitmap bitmap) {
        // Perform character detection logic here
        return null; // Placeholder for actual detection result
    }

    private void startGame() {
        // Start the game activity or perform necessary actions to start the game
    }
}

上述代码创建了一个继承自SurfaceView的自定义视图CharacterDetectionView，用于显示相机预览并检测人物。surfaceCreated方法中打开相机并设置预览回调。surfaceChanged方法中开始相机预览。surfaceDestroyed方法中释放相机资源。onPreviewFrame方法中将预览帧数据转换为位图，并调用detectCharacter方法进行人物检测。如果检测到人物，则调用startGame方法开始游戏。

请注意，上述代码中的detectCharacter方法和startGame方法是占位符，需要根据实际需求自行实现人物检测和游戏开始的逻辑。